A control method, device, heat pump unit and storage medium of a heat pump unit

Abstract

The present invention discloses a control method, device, heat pump unit and storage medium for a heat pump unit. The method includes: determining the current heat exchange capacity corresponding to the current operating parameters by taking the set heat exchange capacity corresponding to the set operating parameters that are the same as the current operating parameters of the heat pump unit in the first corresponding relationship; determining the current air volume according to the current heat exchange capacity and the current air state parameters; determining the estimated heat exchange capacity according to the current target temperature, the current outdoor temperature and the current air volume; determining the estimated operating parameters corresponding to the estimated heat exchange capacity by taking the set operating parameters corresponding to the set heat exchange capacity that is the same as the estimated heat exchange capacity in the first corresponding relationship; and controlling the heat pump unit to operate according to the estimated operating parameters. With this solution, by combining the user-set temperature, outdoor temperature, air volume and the capacity of the heat pump unit to estimate the indoor required load, the heat pump unit operates according to the indoor required load, so that the heat or cold quantity is evenly distributed, improving user comfort and saving energy.

Description

Technical Field

[0001] The present invention belongs to the technical field of heat pump units, and particularly relates to a control method, device, heat pump unit and storage medium for a heat pump unit, and more particularly to a method and device for predicting the indoor load side of a heat pump unit, a heat pump unit and a storage medium. Background Art

[0002] According to statistics, building energy consumption in China accounts for 40% of the total energy consumption, and heating and cooling energy consumption accounts for 68% of building energy consumption. Therefore, building energy consumption is a key issue that needs to be solved urgently at present. During the use of heat pump units, due to the movement of people indoors, the intermittent operation of heat dissipation equipment, and the continuous change of outdoor temperature, the supply air temperature or supply air volume of the heat pump unit is too large or too small, and sometimes there is even a delay in the change of the control system signal of the heat pump unit. In this case, the heat or cold supplied by the heat pump unit to the indoor cannot match well with the load required by the building, resulting in uneven distribution of heat or cold, poor user comfort, and even a large amount of energy waste.

[0003] The above content is only used to assist in understanding the technical solution of the present invention, and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The purpose of the present invention is to provide a control method, device, heat pump unit and storage medium for a heat pump unit, so as to solve the problem that during the use of the heat pump unit, due to the movement of people indoors, the intermittent operation of heat dissipation equipment, and the continuous change of outdoor temperature, the supply air temperature or supply air volume of the heat pump unit is too large or too small, resulting in poor matching between the heat or cold supplied by the heat pump unit to the indoor and the load required by the building, resulting in uneven distribution of heat or cold, poor user comfort, and even a large amount of energy waste. The effect is achieved by predicting the indoor required load by combining the user-set temperature, outdoor temperature, air volume and the capacity of the heat pump unit, and making the heat pump unit operate according to the indoor required load, so that the heat or cold is evenly distributed, which is beneficial to improving user comfort and saving energy.

[0005] The present invention provides a control method for a heat pump unit, comprising: retrieving the corresponding relationship between the set operating parameters of the heat pump unit stored in advance and the set heat exchange capacity of the heat pump unit, denoted as the first corresponding relationship; after the heat pump unit is started and operates for a first set time, obtaining the current operating parameters of the heat pump unit, obtaining the current air state parameters of the environment where the heat pump unit is located, obtaining the current target temperature of the heat pump unit, and obtaining the current outdoor temperature of the environment where the heat pump unit is located; determining the set heat exchange capacity of the heat pump unit corresponding to the set operating parameter of the heat pump unit that is the same as the current operating parameter of the heat pump unit in the first corresponding relationship as the current heat exchange capacity of the heat pump unit corresponding to the current operating parameter of the heat pump unit; determining the current air volume of the heat pump unit according to the current heat exchange capacity of the heat pump unit and the current air state parameters of the environment where the heat pump unit is located; determining the estimated heat exchange capacity of the heat pump unit according to the current target temperature of the heat pump unit, the current outdoor temperature of the heat pump unit, and the current air volume of the heat pump unit; determining the set operating parameter corresponding to the set heat exchange capacity that is the same as the estimated heat exchange capacity of the heat pump unit in the first corresponding relationship as the estimated operating parameter of the heat pump unit corresponding to the estimated heat exchange capacity of the heat pump unit; controlling the heat pump unit to operate according to the estimated operating parameter of the heat pump unit.

[0006] In some embodiments, the first corresponding relationship is specifically a data table; in the data table, there are included n groups of corresponding relationships between the set operating parameters of the heat pump unit and the set heat exchange capacity of the heat pump unit, where n is a positive integer; among them, the operating parameters in the set operating parameter of the heat pump unit, the current operating parameter of the heat pump unit, and the estimated operating parameter of the heat pump unit include: the condensation temperature, evaporation temperature, and compressor frequency of the heat pump unit.

[0007] In some embodiments, the current air state parameters of the environment where the heat pump unit is located include: the current return air temperature and current return air moisture content, as well as the current supply air temperature and current supply air moisture content of the environment where the heat pump unit is located; determining the current air volume of the heat pump unit according to the current heat exchange capacity of the heat pump unit and the current air state parameters of the environment where the heat pump unit is located includes: determining the current return air enthalpy value of the heat pump unit according to the current return air temperature and current return air moisture content of the environment where the heat pump unit is located; determining the current supply air enthalpy value of the heat pump unit according to the current supply air temperature and current supply air moisture content of the environment where the heat pump unit is located; determining the current air volume of the heat pump unit according to the current heat exchange capacity of the heat pump unit, the current return air enthalpy value of the heat pump unit, and the current supply air enthalpy value of the heat pump unit.

[0008] In some embodiments, determining the estimated heat exchange amount of the heat pump unit according to the current target temperature of the heat pump unit, the current outdoor temperature of the heat pump unit, and the current air volume of the heat pump unit includes: during the operation of the heat pump unit, collecting a set of the current heat exchange amount and the current air volume of the heat pump unit, and correspondingly recording a set of the current target temperature and the current outdoor temperature of the heat pump unit; performing fitting based on a set of the current heat exchange amount, the current air volume, the current target temperature, and the current outdoor temperature of the heat pump unit to obtain the corresponding relationship between the current target temperature, the current outdoor temperature, the current air volume, and the current heat exchange amount of the heat pump unit, denoted as the corresponding relationship between the set target temperature, the set outdoor temperature, the set air volume, and the set heat exchange amount of the heat pump unit, as the second corresponding relationship; determining the set heat exchange amount corresponding to the set target temperature that is the same as the current target temperature of the heat pump unit, the set outdoor temperature that is the same as the current outdoor temperature of the heat pump unit, and the set air volume that is the same as the current air volume of the heat pump unit in the second corresponding relationship as the estimated heat exchange amount of the heat pump unit.

[0009] In some embodiments, determining the estimated operating parameter of the heat pump unit corresponding to the estimated heat exchange amount of the heat pump unit by using the set operating parameter corresponding to the set heat exchange amount that is the same as the estimated heat exchange amount of the heat pump unit in the first corresponding relationship includes: when the set operating parameter corresponding to the set heat exchange amount that is the same as the estimated heat exchange amount of the heat pump unit in the first corresponding relationship is one operating parameter, determining the one operating parameter as the estimated operating parameter of the heat pump unit corresponding to the estimated heat exchange amount of the heat pump unit; when the set operating parameter corresponding to the set heat exchange amount that is the same as the estimated heat exchange amount of the heat pump unit in the first corresponding relationship is two or more operating parameters, determining the operating parameter with the highest energy efficiency of the heat pump unit among the two or more operating parameters as the estimated operating parameter of the heat pump unit corresponding to the estimated heat exchange amount of the heat pump unit.

[0010] In some embodiments, it further includes: after determining the estimated operating parameters of the heat pump unit, determining whether a regulation instruction for the current air volume of the heat pump unit is received from the user; if it is determined that the regulation instruction for the current air volume of the heat pump unit is received from the user, then return to re-obtain the current operating parameters of the heat pump unit, re-obtain the current air state parameters of the environment where the heat pump unit is located, re-obtain the current target temperature of the heat pump unit, and re-obtain the current outdoor temperature of the environment where the heat pump unit is located after the heat pump unit operates for a first set time; if it is determined that the regulation instruction for the current air volume of the heat pump unit is not received from the user, then determine whether the current target temperature and the current outdoor environment temperature of the heat pump unit have changed: if so, determine the new current target temperature and the new current outdoor temperature of the heat pump unit, and return to re-determine the estimated heat exchange amount of the heat pump unit according to the new current target temperature, the new current outdoor temperature, and the current air volume of the heat pump unit; otherwise, after controlling the heat pump unit to operate according to the current operating parameters of the heat pump unit for a second set time, re-determine whether the current target temperature and the current outdoor environment temperature of the heat pump unit have changed.

[0011] Matched with the above method, on the other hand, the present invention provides a control device for a heat pump unit, including: an acquisition unit configured to retrieve the corresponding relationship between the set operating parameters of the heat pump unit stored in advance and the set heat exchange amount of the heat pump unit, denoted as the first corresponding relationship; the acquisition unit is further configured to, after the heat pump unit is started and operates for a first set time, acquire the current operating parameters of the heat pump unit, acquire the current air state parameters of the environment where the heat pump unit is located, acquire the current target temperature of the heat pump unit, and acquire the current outdoor temperature of the environment where the heat pump unit is located; a control unit configured to determine the set heat exchange amount of the heat pump unit corresponding to the set operating parameter of the heat pump unit that is the same as the current operating parameter of the heat pump unit in the first corresponding relationship as the current heat exchange amount of the heat pump unit corresponding to the current operating parameter of the heat pump unit; the control unit is further configured to determine the current air volume of the heat pump unit according to the current heat exchange amount of the heat pump unit and the current air state parameters of the environment where the heat pump unit is located; the control unit is further configured to determine the estimated heat exchange amount of the heat pump unit according to the current target temperature of the heat pump unit, the current outdoor temperature of the heat pump unit, and the current air volume of the heat pump unit; the control unit is further configured to determine the set operating parameter corresponding to the set heat exchange amount that is the same as the estimated heat exchange amount of the heat pump unit in the first corresponding relationship as the estimated operating parameter of the heat pump unit corresponding to the estimated heat exchange amount of the heat pump unit; the control unit is further configured to control the heat pump unit to operate according to the estimated operating parameter of the heat pump unit.

[0012] In some embodiments, the first corresponding relationship is specifically a data table; in the data table, there are n groups of corresponding relationships between the set operating parameters of the heat pump unit and the set heat exchange amount of the heat pump unit, where n is a positive integer; among them, the operating parameters in the set operating parameters of the heat pump unit, the current operating parameters of the heat pump unit, and the estimated operating parameters of the heat pump unit include: the condensation temperature, evaporation temperature, and compressor frequency of the heat pump unit.

[0013] In some embodiments, the current air state parameters of the environment where the heat pump unit is located include: the current return air temperature and current return air moisture content, as well as the current supply air temperature and current supply air moisture content of the environment where the heat pump unit is located; the control unit determines the current air volume of the heat pump unit according to the current heat transfer amount of the heat pump unit and the current air state parameters of the environment where the heat pump unit is located, including: determining the current return air enthalpy value of the heat pump unit according to the current return air temperature and current return air moisture content of the environment where the heat pump unit is located; determining the current supply air enthalpy value of the heat pump unit according to the current supply air temperature and current supply air moisture content of the environment where the heat pump unit is located; determining the current air volume of the heat pump unit according to the current heat transfer amount of the heat pump unit, the current return air enthalpy value of the heat pump unit, and the current supply air enthalpy value of the heat pump unit.

[0014] In some embodiments, the control unit determines the estimated heat transfer amount of the heat pump unit according to the current target temperature of the heat pump unit, the current outdoor temperature of the heat pump unit, and the current air volume of the heat pump unit, including: during the operation of the heat pump unit, collecting a set of the current heat transfer amount and current air volume of the heat pump unit, and correspondingly recording a set of the current target temperature and current outdoor temperature of the heat pump unit; performing fitting based on a set of the current heat transfer amount, current air volume, current target temperature, and current outdoor temperature of the heat pump unit to obtain the corresponding relationship between the current target temperature, current outdoor temperature, current air volume, and current heat transfer amount of the heat pump unit, denoted as the corresponding relationship between the set target temperature, set outdoor temperature, set air volume, and set heat transfer amount of the heat pump unit, as the second corresponding relationship; determining the set heat transfer amount corresponding to the set target temperature that is the same as the current target temperature of the heat pump unit, the set outdoor temperature that is the same as the current outdoor temperature of the heat pump unit, and the set air volume that is the same as the current air volume of the heat pump unit in the second corresponding relationship as the estimated heat transfer amount of the heat pump unit.

[0015] In some embodiments, the control unit determines the set operating parameters corresponding to the estimated heat exchange amount of the heat pump unit in the first correspondence relationship as the estimated operating parameters of the heat pump unit corresponding to the estimated heat exchange amount of the heat pump unit, including: when the set operating parameter corresponding to the set heat exchange amount equal to the estimated heat exchange amount of the heat pump unit in the first correspondence relationship is one operating parameter, determining the one operating parameter as the estimated operating parameter of the heat pump unit corresponding to the estimated heat exchange amount of the heat pump unit; when the set operating parameters corresponding to the set heat exchange amount equal to the estimated heat exchange amount of the heat pump unit in the first correspondence relationship are two or more operating parameters, determining the operating parameter with the highest energy efficiency of the heat pump unit among the two or more operating parameters as the estimated operating parameter of the heat pump unit corresponding to the estimated heat exchange amount of the heat pump unit.

[0016] In some embodiments, it further includes: the control unit is further configured to determine whether a regulation instruction for the current air volume of the heat pump unit is received after determining the estimated operating parameters of the heat pump unit; the control unit is further configured to, if it is determined that a regulation instruction for the current air volume of the heat pump unit is received, return to re-obtain the current operating parameters of the heat pump unit, re-obtain the current air state parameters of the environment where the heat pump unit is located, re-obtain the current target temperature of the heat pump unit, and re-obtain the current outdoor temperature of the environment where the heat pump unit is located after the heat pump unit operates for a first set time; the control unit is further configured to, if it is determined that no regulation instruction for the current air volume of the heat pump unit is received, determine whether the current target temperature and the current outdoor environment temperature of the heat pump unit have changed: if so, determine the new current target temperature and the new current outdoor temperature of the heat pump unit, and return to re-determine the estimated heat exchange amount of the heat pump unit according to the new current target temperature, the new current outdoor temperature, and the current air volume of the heat pump unit; otherwise, control the heat pump unit to operate according to the current operating parameters of the heat pump unit for a second set time, and then re-determine whether the current target temperature and the current outdoor environment temperature of the heat pump unit have changed.

[0017] Matched with the above device, on the other hand, the present invention provides a heat pump unit, including: the control device of the heat pump unit described above.

[0018] Matched with the above method, on the other hand, the present invention provides a storage medium, the storage medium includes a stored program, wherein when the program runs, it controls the device where the storage medium is located to execute the control method of the heat pump unit described above.

[0019] Thus, in the solution of the present invention, taking the refrigeration mode as an example, based on the preset refrigerating capacity Q and condensation temperature T of the heat pump unit h , evaporation temperature T l , and the relational formula between the compressor frequency f, according to the condensation temperature T h , evaporation temperature T l , and compressor frequency f during the actual operation of the heat pump unit, calculate the refrigerating capacity Q during the actual operation of the heat pump unit; based on the calculation formula of the refrigerating capacity Q of the heat pump unit Q = qρ(h2 - h1), according to the refrigerating capacity Q, air density ρ, supply air enthalpy value h2, and return air enthalpy value h1 during the actual operation of the heat pump unit, calculate the air volume q during the actual operation of the heat pump unit; collect the set temperature T s , outdoor temperature T w , air volume q, and refrigerating capacity Q' during the actual operation of the heat pump unit, and fit the relational formula between the set temperature T s , outdoor temperature T w , air volume q, and the refrigerating capacity Q' of the heat pump unit. According to the set temperature T s , outdoor temperature T w , and air volume q during the actual operation of the heat pump unit, calculate the refrigerating capacity Q' during the actual operation of the heat pump unit as the estimated refrigerating capacity Q' of the heat pump unit at the next moment; based on the preset relational formula between the refrigerating capacity Q and condensation temperature T h , evaporation temperature T l , and compressor frequency f of the heat pump unit, according to this estimated refrigerating capacity Q', determine the condensation temperature T h , evaporation temperature T l , and compressor frequency f corresponding to this estimated refrigerating capacity Q' as the operating parameters of the heat pump unit at the next moment, realizing the matching of the refrigerating capacity of the heat pump unit and the indoor required cooling load. Thus, by combining the user-set temperature, outdoor temperature, air volume, and the capacity of the heat pump unit to estimate the indoor required load, the heat pump unit operates according to the indoor required load, making the heat or cold quantity evenly distributed, which is beneficial to improving user comfort and saving energy.

[0020] Other features and advantages of the present invention will be described in the subsequent specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention.

[0021] The following will further describe the technical solution of the present invention in detail through the drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic flowchart of an embodiment of the control method of the heat pump unit of the present invention;

[0023] Figure 2Schematic flowchart of an embodiment for determining the current air volume of the heat pump unit in the method of the present invention;

[0024] Figure 3 Schematic flowchart of an embodiment for determining the estimated heat exchange capacity of the heat pump unit in the method of the present invention;

[0025] Figure 4 Schematic flowchart of an embodiment for adjusting the estimated operating parameters of the heat pump unit in the method of the present invention;

[0026] Figure 5 Schematic structural diagram of an embodiment of the control device of the heat pump unit of the present invention;

[0027] Figure 6 Schematic structural diagram of an embodiment of the heat pump unit of the present invention;

[0028] Figure 7 Schematic control flowchart of an embodiment of the indoor load side estimation method for the heat pump unit of the present invention.

[0029] In combination with the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0030] 1 - Return air temperature and humidity sensor; 2 - Gas-liquid separator; 3 - Outdoor heat exchanger; 4 - Outdoor heat exchanger temperature sensor; 5 - Indoor heat exchanger; 6 - Outdoor ambient temperature sensor; 7 - Compressor; 8 - Electronic expansion valve; 9 - Indoor heat exchanger temperature sensor; 10 - Four-way reversing valve; 11 - Supply air temperature and humidity sensor; 12 - Main control unit; 102 - Acquisition unit; 104 - Control unit. Detailed implementation manners

[0031] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0032] Considering that the load on the indoor side is affected by many factors, such as indoor personnel, indoor heat dissipation equipment, outdoor air temperature, etc. The above factors cause the indoor side load to change continuously, and the load supplied by the heat pump unit to the indoor cannot match well with the load required by the building, resulting in uneven cold quantity distribution and poor user comfort. In addition, if the load supplied by the heat pump unit to the indoor cannot match the load required by the building for a long time, a large amount of energy waste will be caused.

[0033] As an important preliminary task in the regulation of refrigeration systems, cold load prediction can not only improve the accuracy of refrigeration systems and the comfort of users. Correspondingly, as an important preliminary task in the regulation of heating systems, heat load prediction can not only improve the accuracy of heating systems and the comfort of users. Thus, it can provide good guarantee for the adjustment in the later system operation stage; it can also save costs and resources, providing an effective solution for sustainable development.

[0034] Some solutions provide a method for dynamic load estimation and fresh air volume control of large-space building air conditioners that integrates image information. Specifically, it collects images of large-space public buildings, extracts human targets in the building space, and thereby establishes a linear model for estimating the population density in the building space. According to the population density estimation model, it real-time estimates the change in population density in the building space, calculates the dynamic human load, and combines it with the area of the enclosure structure to estimate the dynamic fresh air volume L w (t) in the building space at time t. However, when estimating the cold load, this method only focuses on the changes in the building's occupants and does not consider the impact of other influencing factors (such as outdoor temperature) on the load, resulting in inaccurate load prediction.

[0035] Therefore, the solution of the present invention provides an indoor load side estimation method for heat pump units, considering that factors such as indoor occupants, indoor heat dissipation equipment, and outdoor air temperature cause continuous changes in the indoor side load. Combining the user-set temperature, outdoor temperature, air volume, and the capacity of the heat pump unit, it estimates the indoor required load, ensuring the accuracy of the estimated indoor required load.

[0036] According to an embodiment of the present invention, a control method for a heat pump unit is provided, as Figure 1 shown in the flow schematic diagram of an embodiment of the method of the present invention. Specifically, the solution of the present invention proposes a method for estimating the capacity of a heat pump unit, specifically as a method for estimating the capacity of a heat pump unit as Figure 6 shown. Figure 6 is a structural schematic diagram of an embodiment of the heat pump unit of the present invention. As Figure 6 shown, the heat pump unit includes: a return air temperature and humidity sensor (or supply air temperature and humidity sensor) 1, a gas-liquid separator 2, an outdoor heat exchanger 3, an outdoor heat exchanger temperature sensor 4, an indoor heat exchanger 5, an outdoor ambient temperature sensor 6, a compressor 7, an electronic expansion valve 8, an indoor heat exchanger temperature sensor 9, a four-way reversing valve 10, an outlet air temperature and humidity sensor 11, and a main control unit 12 of the heat pump unit. The exhaust port of the compressor 7 is connected to the first valve port of the four-way reversing valve 10. The second valve port of the four-way reversing valve 10 is connected to the fourth valve port of the four-way reversing valve 10 after passing through the outdoor heat exchanger 3, the electronic expansion valve 8, and the indoor heat exchanger 5. The third valve port of the four-way reversing valve 10 returns to the suction port of the compressor 7 after passing through the gas-liquid separator 2. As Figure 6The control method of the heat pump unit shown includes steps S110 to S170.

[0037] At step S110, when the heat pump unit is turned on, retrieve the corresponding relationship between the preset operating parameters of the heat pump unit and the preset heat exchange capacity of the heat pump unit, denoted as the first corresponding relationship.

[0038] In step S110, the first corresponding relationship is specifically a data table. In the data table, there are n groups of corresponding relationships between the preset operating parameters of the heat pump unit and the preset heat exchange capacity of the heat pump unit, where n is a positive integer.

[0039] Among them, the operating parameters in the preset operating parameters of the heat pump unit, the current operating parameters of the heat pump unit, and the estimated operating parameters of the heat pump unit include: the condensation temperature, evaporation temperature, and compressor frequency of the heat pump unit. That is, what is retrieved in step S110 is the corresponding relationship between the preset condensation temperature, preset evaporation temperature, preset compressor frequency, and preset heat exchange capacity of the heat pump unit as the first corresponding relationship. Among them, the condensation temperature is the condenser tube temperature, such as the condensation temperature T h . The evaporation temperature is the evaporator tube temperature, such as the evaporation temperature T l . The heat exchange capacity in the preset heat exchange capacity, current heat exchange capacity, and estimated heat exchange capacity is the refrigeration capacity Q in the refrigeration mode or the heating capacity in the heating mode. Refer to Figure 6 the example shown. The outdoor heat exchanger temperature sensor 4 and the indoor heat exchanger temperature sensor 9 are respectively located on the outdoor heat exchanger 3 and the indoor heat exchanger 5. In the refrigeration mode, the condensation temperature T h and the evaporation temperature T l of the heat pump unit are respectively detected. The heating mode is the opposite. That is, the outdoor heat exchanger temperature sensor 4 and the indoor heat exchanger temperature sensor 9 are respectively located on the outdoor heat exchanger 3 and the indoor heat exchanger 5. In the heating mode, the evaporation temperature T l and the condensation temperature T h of the heat pump unit are respectively detected.

[0040] Since the estimation methods of refrigeration capacity and heating capacity are similar, in the following embodiments, the specific implementation process of the solution of the present invention is exemplarily described by taking the refrigeration capacity estimation as an example, and the heating mode refers to the refrigeration mode. Figure 7 It is a schematic diagram of the control flow of an embodiment of an indoor load side estimation method for a heat pump unit according to the present invention. As Figure 7 shown, in the refrigeration mode, an indoor load side estimation method for a heat pump unit provided by the solution of the present invention includes:

[0041] Step 1. Before leaving the factory, test the refrigeration capacity of the heat pump unit (such as the refrigerating capacity Q of the heat pump unit). Since the refrigerating capacity Q of the heat pump unit is affected by the condensation temperature T h , evaporation temperature T l , and compressor frequency f, therefore, according to the test data of the heat pump unit before leaving the factory, establish the relationship between the condensation temperature T h , evaporation temperature T l , compressor frequency f and refrigerating capacity Q, that is, Q = F(T h , T1, f).

[0042] Among them, the relationship between the condensation temperature T h , evaporation temperature T l , compressor frequency f and refrigerating capacity Q, that is, Q = F(T h , T1, f), is the relationship between the refrigerating capacity Q of the heat pump unit and the condensation temperature T h , evaporation temperature T l , compressor frequency f. It should be noted that for different heat pump units, due to different configurations and controls, the relationship between the condensation temperature T h , evaporation temperature T l , compressor frequency f and refrigerating capacity Q, that is, Q = F(T h , T1, f) are all different, so the coefficients of each parameter in this relationship are different. The coefficients of the relationship between the refrigerating capacity Q of the heat pump unit and the condensation temperature T h , evaporation temperature T l , compressor frequency f are affected by various factors such as the size of the heat pump unit and the outdoor environment. Therefore, the specific coefficients of this relationship can only be determined under the conditions of specific heat pump unit configuration and specific use environment.

[0043] Step 2. According to the relationship between the condensation temperature T h , evaporation temperature T l , compressor frequency f and refrigerating capacity Q, that is, Q = F(T h , T1, f), extract n groups of data (specifically n groups of test data). The refrigerating capacity Q corresponds to Q1, Q2, Q2,..., Q n . The condensation temperature corresponds to T h1 , T h2 , T h3 ,..., T hn . The evaporation temperature T 11 , T 12 , T 13 ,..., T 1n . The compressor frequency corresponds to f1, f2, f3,..., f n , and n is a positive integer. Organize each group of data, establish a data table, and place the data table in the main control unit 12 of the heat pump unit.

[0044] Step 3: After the heat pump unit is started and runs for the set time t (the set time t is the fan stabilization time, which can be 5 min), it can be considered that the air supply volume of the heat pump unit is stable at this time, and the condensation temperature T in the operating parameters of the heat pump unit can be obtained. h , evaporation temperature T l , and the measured data of the compressor frequency f, namely the measured data of the parameters (T h , T1, f). According to the condensation temperature T h , evaporation temperature T l , and the relationship between the compressor frequency f and the refrigerating capacity Q, that is Q = F(T h , T1, f), calculate the current refrigerating capacity Q of the heat pump unit based on the measured data of the condensation temperature T h , evaporation temperature T l , and compressor frequency f of the heat pump unit.

[0045] Here, under various external conditions that can be obtained through testing before leaving the factory, the relationship between the refrigerating capacity of the heat pump unit and the evaporation temperature, condensation temperature, and compressor frequency is obtained, so that the test data under multiple working conditions can be placed in the unit control unit; moreover, the evaporation temperature, condensation temperature, and compressor frequency of the heat pump unit belong to the parameter settings of the heat pump unit itself and have nothing to do with external conditions. However, it is difficult to import the data obtained from the actual operation of the heat pump unit into the control unit of the heat pump unit after leaving the factory, and the working conditions faced by the heat pump unit in actual operation are relatively single. Therefore, importing the test data into the control unit of the heat pump unit before leaving the factory is more conducive to the efficiency and versatility of the control of the heat pump unit.

[0046] At step S120, after the heat pump unit is started and runs for the first set time, obtain the current operating parameters of the heat pump unit, obtain the current air state parameters of the environment where the heat pump unit is located, obtain the current target temperature of the heat pump unit, and obtain the current outdoor temperature of the environment where the heat pump unit is located. The first set time is like the set time t, the current target temperature of the heat pump unit is like the user-set temperature T s , and the outdoor temperature of the environment where the heat pump unit is located is like the outdoor temperature T w . See Figure 6 the example shown in, the outdoor ambient temperature sensor 6 is located outdoors and is used to detect the outdoor temperature T w .

[0047] At step S130, determine the current heat exchange capacity of the heat pump unit corresponding to the current operating parameters of the heat pump unit as the set heat exchange capacity of the heat pump unit corresponding to the set operating parameters of the heat pump unit that are the same as the current operating parameters of the heat pump unit in the first correspondence relationship. The current heat exchange capacity of the heat pump unit is the current refrigeration capacity of the heat pump unit in the refrigeration mode and the current heating capacity of the heat pump unit in the heating mode. The current heat exchange capacity of the heat pump unit, such as the refrigeration capacity Q in the refrigeration mode.

[0048] At step S140, determine the current air volume of the heat pump unit according to the current heat exchange capacity of the heat pump unit and the current air state parameters of the environment where the heat pump unit is located.

[0049] In some embodiments, the current air state parameters of the environment where the heat pump unit is located include: the current return air temperature and current return air moisture content of the environment where the heat pump unit is located, as well as the current supply air temperature and current supply air moisture content.

[0050] Refer to Figure 6 In the example shown, the return air temperature and humidity sensor 1 is located at the return air inlet of the heat pump unit and is used to detect the return air temperature t1 and return air moisture content d1 of the heat pump unit. The supply air temperature and humidity sensor (or supply air temperature and humidity sensor) 11 is located at the supply air outlet of the heat pump unit and is used to detect the supply air temperature t2 and supply air moisture content d2 of the heat pump unit. The main control unit 12 of the heat pump unit is connected to the compressor 7, the outdoor ambient temperature sensor 6, the outdoor heat exchanger temperature sensor 4, the return air temperature and humidity sensor 1, the supply air temperature and humidity sensor 11, and the indoor heat exchanger temperature sensor 9.

[0051] The specific process of determining the current air volume of the heat pump unit according to the current heat exchange capacity of the heat pump unit and the current air state parameters of the environment where the heat pump unit is located in step S140 is described with reference to the following exemplary description.

[0052] The following combines Figure 2 The schematic flow chart of an embodiment for determining the current air volume of the heat pump unit in the method of the present invention shown, and further describes the specific process of determining the current air volume of the heat pump unit in step S140, including: step S210 to step S230.

[0053] Step S210, based on the correspondence relationship between the set temperature, set moisture content and set enthalpy value of the heat pump unit, determine the current return air enthalpy value of the heat pump unit according to the current return air temperature and current return air moisture content of the environment where the heat pump unit is located.

[0054] Step S220: Based on the corresponding relationship among the set temperature, set moisture content, and set enthalpy value of the heat pump unit, determine the current supply air enthalpy value of the heat pump unit according to the current supply air temperature and current supply air moisture content in the environment where the heat pump unit is located.

[0055] Step S230: Based on the set heat exchange capacity, set air volume, and the corresponding relationship between the set supply air enthalpy value and the set return air enthalpy value of the heat pump unit, determine the current air volume of the heat pump unit according to the current heat exchange capacity, the current return air enthalpy value, and the current supply air enthalpy value of the heat pump unit.

[0056] Specifically, as Figure 7 shown, in the cooling mode, an indoor load side prediction method for a heat pump unit provided by the solution of the present invention further includes:

[0057] Step 4: Obtain the supply air temperature t2, return air temperature t1, supply air moisture content d2, and return air moisture content d1 through the temperature sensors and humidity sensors (i.e., the supply air temperature and humidity sensor 11 and the return air temperature and humidity sensor 1) arranged at the supply air outlet and return air outlet. According to the formula between temperature and moisture content (the supply air enthalpy value h2 and return air enthalpy value h1 can be obtained. For example: the formula between temperature and moisture content can be h = 1.01t + 0.001d(2501 + 1.85t), where h is the enthalpy value, t is the temperature, and d is the moisture content.

[0058] Step 5: Obtain the current cooling capacity Q of the heat pump unit calculated in Step 3, and the air state parameters (i.e., the return air enthalpy value h1 and supply air enthalpy value h2) in the environment where the heat pump unit is located calculated in Step 4. According to the relationship ρ = F(t, d) between the supply air density ρ, supply air dry bulb temperature t, and supply air moisture content d, ρ can be calculated. From the calculation formula of the cooling capacity Q of the heat pump unit Q = qρ(h2 - h1), the air volume q of the heat pump unit can be determined.

[0059] Among them, for the air density ρ, the dry air density = (atmospheric pressure - water vapor partial pressure) / (dry air gas constant * dry bulb temperature), where the water vapor partial pressure can be obtained from the moisture content, the dry air gas constant is 287, and the dry bulb temperature is in Kelvin temperature.

[0060] At step S150, determine the estimated heat exchange capacity of the heat pump unit according to the current target temperature, the current outdoor temperature, and the current air volume of the heat pump unit.

[0061] In some embodiments, for the specific process of determining the estimated heat exchange capacity of the heat pump unit according to the current target temperature, the current outdoor temperature, and the current air volume of the heat pump unit in step S150, refer to the following exemplary description.

[0062] The following combines Figure 3 a schematic flowchart of an embodiment for determining the estimated heat exchange capacity of the heat pump unit in the method of the present invention shown in the figure, and further illustrates the specific process of determining the estimated heat exchange capacity of the heat pump unit in step S150, including: steps S310 to S330.

[0063] Step S310, during the operation of the heat pump unit, collect a set of the current heat exchange capacity and the current air volume of the heat pump unit, and correspondingly record a set of the current target temperature and the current outdoor temperature of the heat pump unit.

[0064] Step S320, based on a set of the current heat exchange capacity, the current air volume, the current target temperature, and the current outdoor temperature of the heat pump unit, perform fitting to obtain the corresponding relationship between the current target temperature, the current outdoor temperature, the current air volume, and the current heat exchange capacity of the heat pump unit, denoted as the corresponding relationship between the set target temperature, the set outdoor temperature, the set air volume, and the set heat exchange capacity of the heat pump unit, as the second corresponding relationship.

[0065] Step S330, determine the set heat exchange capacity corresponding to the set target temperature that is the same as the current target temperature of the heat pump unit, the set outdoor temperature that is the same as the current outdoor temperature of the heat pump unit, and the set air volume that is the same as the current air volume of the heat pump unit in the second corresponding relationship as the estimated heat exchange capacity of the heat pump unit. The estimated heat exchange capacity of the heat pump unit at the next time, such as the estimated cooling capacity Q' at the next time in the cooling mode.

[0066] Specifically, as Figure 7 shown, in the cooling mode, a method for estimating the indoor load side of a heat pump unit provided by the solution of the present invention further includes:

[0067] Step 6: Collect a large amount of operation data, and fit the linear relationship between the outdoor temperature T s under different set temperatures T w , the air volume q, and the cooling capacity Q' of the heat pump unit, that is, Q' = f(T s , T w , q), and establish a relevant table.

[0068] The linear relationship between the set temperature T s , the outdoor temperature T w , the air volume q, and the cooling capacity Q' of the heat pump unit, that is, Q' = f(T s , T w , q), is obtained by fitting a large amount of data obtained during the operation of the heat pump unit regarding the cooling capacity Q' and the set temperature T s , the outdoor temperature Tw , the relational expression between the air volume q. For example, at a certain set temperature T s and a certain outdoor temperature T w , when the air volume of the heat pump unit is determined to be q, the refrigerating capacity Q' of the heat pump unit can be obtained. The coefficients of this relational expression are affected by factors such as the performance and configuration of the heat pump unit, and need to be obtained through a large amount of operation data.

[0069] Here, the outdoor temperature T w , the linear relationship between the air volume q and the refrigerating capacity Q' of the heat pump unit, that is, Q' = f(T s , T w , q), is about the relationship between the refrigerating capacity of the heat pump unit and the user-set temperature, outdoor temperature and air volume, and is affected by the performance and configuration of the heat pump unit and the user's usage situation. Therefore, by obtaining a large amount of operation data of the unit and fitting the relational expression between the parameters of the unit, it is more beneficial to improve the control performance of the heat pump unit. If the fitting result obtained directly from the test data before leaving the factory is used, the refrigerating capacity and air volume of all heat pump units under the same working conditions will be the same, which is not conducive to optimizing the control performance of the heat pump unit.

[0070] Step 7: Based on the set temperature T s , the outdoor temperature T w , the linear relationship between the air volume q and the refrigerating capacity Q' of the heat pump unit, that is, Q' = f(T s , T w , q), through the user-set temperature T s and the outdoor temperature T obtained by the outdoor temperature sensor w , as well as the air volume q of the heat pump unit, determine the refrigerating capacity Q' of the heat pump unit as the estimated refrigerating capacity Q' of the heat pump unit at the next moment.

[0071] At step S160, the set operating parameters corresponding to the set heat exchange amount that is the same as the estimated heat exchange amount of the heat pump unit in the first corresponding relationship are determined as the estimated operating parameters of the heat pump unit corresponding to the estimated heat exchange amount of the heat pump unit.

[0072] In some embodiments, in step S160, determining the set operating parameters corresponding to the set heat exchange amount that is the same as the estimated heat exchange amount of the heat pump unit in the first corresponding relationship as the estimated operating parameters of the heat pump unit corresponding to the estimated heat exchange amount of the heat pump unit includes the following two determination cases:

[0073] The first determination case: When the set operating parameter corresponding to the set heat exchange amount that is the same as the estimated heat exchange amount of the heat pump unit in the first corresponding relationship is one operating parameter, determine this one operating parameter as the estimated operating parameter of the heat pump unit corresponding to the estimated heat exchange amount of the heat pump unit.

[0074] The second determination case: When there are more than two set operating parameters corresponding to the set heat exchange capacity that is the same as the estimated heat exchange capacity of the heat pump unit in the first corresponding relationship, determine the operating parameter with the highest energy efficiency among the more than two operating parameters as the estimated operating parameter of the heat pump unit corresponding to the estimated heat exchange capacity of the heat pump unit.

[0075] Specifically, as Figure 7 shown, in the cooling mode, an indoor load side estimation method for a heat pump unit provided by the solution of the present invention further includes: Step 8, substituting the estimated cooling capacity Q' of the heat pump unit at the next moment into the data table in Step 2 for verification, and extracting the corresponding condensation temperature T h , evaporation temperature T1 and compressor frequency f, and operating with them as the operating parameters of the heat pump unit at the next moment. If there are multiple operating parameters of the heat pump unit under the condition of the same estimated cooling capacity Q', the heat pump unit automatically extracts the operating parameter with the highest energy efficiency for operation, so that the heat pump unit is in the most energy-saving operating state.

[0076] Among them, the parameter maintenance time T of the heat pump unit is set according to the performance of the heat pump unit before leaving the factory. During actual operation, it is divided into time intervals T1, T2, T3,..., T n where n is a positive integer. The next moment and the next time mentioned in the solution of the present invention refer to the time interval to be reached among T1, T2, T3,..., T n time intervals.

[0077] At step S170, control the heat pump unit to operate according to the estimated operating parameter of the heat pump unit.

[0078] An indoor load side estimation method for a heat pump unit provided by the solution of the present invention selects n state points as test points of the heat pump unit before the main unit of the heat pump unit leaves the factory, and obtains n sets of data of the heat pump unit load (i.e., cooling capacity Q), condensation temperature T h , evaporation temperature T1 and compressor frequency f. Establish a relational expression of Q = F(T h , T1, f), and organize each data into a table, and place it in the control unit 104 of the heat pump unit as a data processing unit. During the operation of the heat pump unit, through a large amount of operation data, fit the linear relationship between the outdoor temperature T s , air volume q and the heat pump unit load (i.e., cooling capacity Q') of the heat pump unit at different set temperatures T w , and obtain the heat pump unit load (i.e., cooling capacity Q') as a function of the outdoor temperature T w , air volume q and set temperature T sThe fluctuation condition. Furthermore, through the outdoor temperature T w , the air volume q, and the set temperature T s The estimated load of the heat pump unit (i.e., the cooling capacity Q') obtained is used to determine the required load of the heat pump unit at the next moment (i.e., the cooling capacity Q'), and the parameters of the heat pump unit in the data processing unit are extracted, and the operating parameters with the highest energy efficiency are selected to make the heat pump unit in the most energy-saving state, which not only ensures the efficient operation of the heat pump unit, improves the user comfort, but also reduces the energy consumption.

[0079] In some embodiments, in the control method of the heat pump unit described in the solution of the present invention, after determining, in step S160, the set operating parameters corresponding to the set heat exchange amount in the first correspondence relationship that is the same as the estimated heat exchange amount of the heat pump unit as the estimated operating parameters of the heat pump unit corresponding to the estimated heat exchange amount of the heat pump unit, it further includes: a process of adjusting the estimated operating parameters of the heat pump unit.

[0080] The following combines Figure 4 As shown, a schematic flowchart of an embodiment of adjusting the estimated operating parameters of the heat pump unit in the method of the present invention further illustrates the specific process of adjusting the estimated operating parameters of the heat pump unit, including: steps S410 to S430.

[0081] Step S410, after determining the estimated operating parameters of the heat pump unit, determine whether a regulation instruction for the current air volume of the heat pump unit is received from the user.

[0082] Step S420, if it is determined that a regulation instruction for the current air volume of the heat pump unit is received from the user, then return to re-obtain the current operating parameters of the heat pump unit, re-obtain the current air state parameters of the environment where the heat pump unit is located, re-obtain the current target temperature of the heat pump unit, and re-obtain the current outdoor temperature of the environment where the heat pump unit is located after the heat pump unit operates for a first set time, and then re-determine the current heat exchange amount of the heat pump unit and the current air volume of the heat pump unit to re-determine the estimated heat exchange amount of the heat pump unit.

[0083] Step S430: If it is determined that no adjustment instruction for the current air volume of the heat pump unit is received from the user, then determine whether the current target temperature of the heat pump unit and the current outdoor ambient temperature have changed. If so, determine the new current target temperature of the heat pump unit and the new current outdoor temperature of the heat pump unit, and return to re-determine the estimated heat exchange amount of the heat pump unit based on the new current target temperature of the heat pump unit, the new current outdoor temperature of the heat pump unit, and the current air volume of the heat pump unit. Otherwise, after controlling the heat pump unit to operate according to the current operating parameters of the heat pump unit for a second set time, re-determine whether the current target temperature of the heat pump unit and the current outdoor ambient temperature have changed.

[0084] Specifically, as Figure 7 shown, in the cooling mode, a method for estimating the indoor load side of a heat pump unit provided by the solution of the present invention further includes:

[0085] After step 8, that is, after making the heat pump unit operate in the most energy-efficient state, determine whether the user adjusts the air volume q of the heat pump unit. If the user controls and adjusts the air volume q of the heat pump unit, then execute step 9. If the user does not control and adjust the air volume q of the heat pump unit, then execute step 10.

[0086] Step 9: After operating for a set time t (the set time t is the fan stabilization time, which can be 5 minutes), re-measure the condensation temperature T h , evaporation temperature T l , and the measurement data of the compressor frequency f, that is, the measurement data of the parameters (T h , T1, f). According to the relationship between the condensation temperature T h , evaporation temperature T l , compressor frequency f and the refrigerating capacity Q, that is, Q = F(T h , T1, f), calculate the current refrigerating capacity Q of the heat pump unit based on the measurement data of the condensation temperature T h , evaporation temperature T l , compressor frequency f of the heat pump unit. Then, re-enter the loop, that is, re-execute step 4.

[0087] Step 10: In the case where the user does not control and adjust the air volume q of the heat pump unit, determine whether the outdoor temperature T w , and the user-set temperature T s have changed.

[0088] In step 10, if the outdoor temperature T w , and the user-set temperature T s have changed, then return to step 7 to re-based on the set temperature T s , outdoor temperature T w, the linear relationship between the air volume q and the refrigerating capacity Q' of the heat pump unit is Q' = f(T s , T w , q). By obtaining the set temperature T s of the user and the outdoor temperature T w acquired by the outdoor temperature sensor, as well as the air volume q of the heat pump unit, the refrigerating capacity Q' of the heat pump unit is determined as the estimated refrigerating capacity Q' of the heat pump unit at the next moment.

[0089] In step 10, if the outdoor temperature T w and the set temperature T s of the user do not change, the heat pump unit is kept in its current operating state. After a set time t1, step 10 is returned to continue to determine whether the outdoor temperature T w and the set temperature T s of the user change. Here, the heat pump unit being kept in its current operating state means operating according to the operating parameters at the current moment.

[0090] The heat pump unit involved in the solution of the present invention is a water-cooled air-cooled system. Actually, it is not limited to this system and can also be applied to air-cooled air-cooled, water-cooled chilled water, and air-cooled chilled water systems. Only the parameters used need to be adjusted according to the system used.

[0091] In the solution of the present invention, the refrigerating capacity Q' of the heat pump unit is determined according to the set temperature T s of the user and the outdoor temperature T w . When the refrigerating capacity Q' of the heat pump unit reaches equilibrium with the indoor cooling load, the refrigerating capacity Q' of the heat pump unit at this time is the indoor required cooling load, realizing load prediction. The actual refrigerating capacity Q of the heat pump unit and the estimated refrigerating capacity Q' are checked and verified. The refrigerating capacity Q' of the heat pump unit at the next moment is determined through weather forecasting, realizing the optimal control of the refrigerating capacity. For example: The heat pump unit is provided with a WIFI module that can connect to the network to obtain the local weather forecast, and the outdoor temperature T w at the next moment can be obtained. Thus, the optimal heat pump unit parameters are selected according to the refrigerating capacity of the heat pump unit, making the heat pump unit operate in an efficient state, optimizing the heat pump unit parameters, and realizing energy conservation. Here, the actual refrigerating capacity Q of the heat pump unit is the refrigerating capacity at the current moment, while the estimated refrigerating capacity Q' is the predicted refrigerating capacity at the next moment. Therefore, the actual refrigerating capacity Q of the heat pump unit should change with the change of the estimated refrigerating capacity Q'. The heat pump unit extracts the condensing temperature T h , evaporation temperature T l and compressor frequency f with the highest energy efficiency according to the estimated refrigerating capacity Q' and operates, making the heat pump unit in the most energy-saving state.

[0092] Some solutions provide a control method and a control device for an air-conditioning heat pump unit, which controls the air-conditioning heat pump unit to operate at a preset opening degree of an energy regulating valve according to a desired temperature. The estimated operating load of the air-conditioning heat pump unit is obtained according to the current operating parameters of the vehicle. The preset opening degree of the energy regulating valve is adjusted according to the estimated operating load. However, the solution of the present invention saves more energy by reducing the input power of the compressor in the air-conditioning heat pump unit.

[0093] There are also some solutions that provide a method for dynamically estimating the load and controlling the fresh air volume of an air-conditioning system in a large-space building that integrates image information. By establishing a linear model of the personnel density in the building space, the change in the personnel density in the building space is estimated in real time, and the dynamic human load is calculated. However, only the influence of personnel changes on the indoor required load is considered, and the factor that has the greatest impact on the indoor load, which should be the outdoor temperature, is not considered. In the solution of the present invention, considering factors such as indoor personnel, indoor heat dissipation equipment, and outdoor air temperature that cause the indoor-side load to change continuously, combined with the user-set temperature, outdoor temperature, air volume, and the capacity of the heat pump unit, the indoor required load is estimated, which can ensure the accuracy of the estimation of the indoor required load.

[0094] There are also some solutions that provide a load estimation method, device, and heat pump unit equipment based on user portraits, which obtain the annual load curve and load prediction values of the target user. The annual load curve is decomposed according to multiple load fluctuation frequencies to obtain multiple load fluctuation frequency characteristic components. Cluster analysis is performed on the multiple load fluctuation frequency characteristic components to obtain multiple cluster center curves. Based on the multiple cluster center curves, the daily load characteristic curve is obtained. According to the daily load characteristic curve and the load prediction values, the daily load at multiple moments is obtained. By using Monte Carlo to calculate the daily load at multiple moments, the predicted daily load at multiple moments is obtained. However, only the indoor load estimation is considered, and no optimization method for the operation of the heat pump unit is proposed. In the solution of the present invention, by estimating the load of the heat pump unit and extracting the optimal parameter heat pump unit for adjustment, the load demand on the indoor side is updated quickly and in real time, and the heat pump unit operates efficiently, which not only ensures the efficient operation of the heat pump unit but also reduces energy consumption.

[0095] The solution of the present invention provides an indoor load-side estimation method for a heat pump unit. Taking the indoor cooling load estimation as an example, before leaving the factory, the relationship between the condensation temperature T h , evaporation temperature T l , compressor frequency f, and refrigerating capacity Q, that is, the relationship of Q = F(T h , T1, f), is determined through testing and is organized into a table and built into the control unit 104 of the heat pump unit to achieve the standardized selection of the heat pump unit capacity. During the operation of the heat pump unit, the user-set temperature T s , outdoor temperature T w、The relationship between the air volume q and the capacity Q' of the heat pump unit is used to estimate the load required by the heat pump unit at the next moment. In this way, considering the factors such as indoor occupants, indoor heat dissipation equipment, and outdoor air temperature that cause the indoor-side load to change continuously, and combining the user-set temperature, outdoor temperature, air volume, and the capacity of the heat pump unit, the indoor required load is estimated, which can ensure the accuracy of the estimation of the indoor required load. Furthermore, by estimating the load of the heat pump unit and extracting the optimal parameter heat pump unit for adjustment, the load demand on the indoor side can be updated quickly and in real time, and the efficient operation of the heat pump unit can be achieved, which not only ensures the efficient operation of the heat pump unit but also reduces energy consumption.

[0096] Adopting the technical solution of this embodiment, taking the refrigeration mode as an example, based on the pre-set refrigerating capacity Q and condensation temperature T of the heat pump unit h 、evaporation temperature T l 、the relational expression between the compressor frequency f, according to the condensation temperature T during the actual operation of the heat pump unit h 、evaporation temperature T l 、compressor frequency f to calculate the refrigerating capacity Q during the actual operation of the heat pump unit. Based on the calculation formula of the refrigerating capacity Q of the heat pump unit Q = qρ(h2 - h1), according to the refrigerating capacity Q, air density ρ, supply air enthalpy value h2, and return air enthalpy value h1 during the actual operation of the heat pump unit, calculate the air volume q during the actual operation of the heat pump unit. Collect the set temperature T s 、outdoor temperature T w 、air volume q, and refrigerating capacity Q' during the actual operation of the heat pump unit, and fit the relational expression between the set temperature T s 、outdoor temperature T w 、air volume q, and the refrigerating capacity Q' of the heat pump unit. According to the set temperature T s 、outdoor temperature T w 、air volume q during the actual operation of the heat pump unit, calculate the refrigerating capacity Q' during the actual operation of the heat pump unit as the estimated refrigerating capacity Q' of the heat pump unit at the next moment. Based on the pre-set relational expression between the refrigerating capacity Q and condensation temperature T h 、evaporation temperature T l 、compressor frequency f, according to this estimated refrigerating capacity Q', determine the condensation temperature T h 、evaporation temperature T l 、compressor frequency f as the operating parameters of the heat pump unit at the next moment, realizing the matching of the refrigerating capacity of the heat pump unit and the indoor required cooling load. Thus, by combining the user-set temperature, outdoor temperature, air volume, and the capacity of the heat pump unit to estimate the indoor required load, the heat pump unit operates according to the indoor required load, making the heat or cold quantity distribution uniform, which is beneficial to improving user comfort and saving energy.

[0097] According to an embodiment of the present invention, there is also provided a control device for a heat pump unit corresponding to a control method of the heat pump unit. Refer to Figure 5 the structural schematic diagram of an embodiment of the device of the present invention shown. The control device of the heat pump unit may include: an acquisition unit 102 and a control unit 104.

[0098] Among them, the acquisition unit 102 is configured to, when the heat pump unit is started up, retrieve the corresponding relationship between the set operating parameters of the heat pump unit and the set heat exchange amount of the heat pump unit stored in advance, denoted as the first corresponding relationship. For the specific functions and processes of the acquisition unit 102, refer to step S110.

[0099] In some embodiments, the first corresponding relationship is specifically a data table. In the data table, there are included n groups of the corresponding relationships between the set operating parameters of the heat pump unit and the set heat exchange amount of the heat pump unit, where n is a positive integer.

[0100] Among them, the operating parameters in the set operating parameters of the heat pump unit, the current operating parameters of the heat pump unit, and the estimated operating parameters of the heat pump unit include: the condensation temperature, evaporation temperature, and compressor frequency of the heat pump unit. That is, in step S110, the retrieved corresponding relationship between the set condensation temperature, set evaporation temperature, set compressor frequency, and set heat exchange amount of the heat pump unit stored in advance is used as the first corresponding relationship. Among them, the condensation temperature is the condenser tube temperature, such as the condensation temperature T h . The evaporation temperature is the evaporator tube temperature, such as the evaporation temperature T l . The heat exchange amount in the set heat exchange amount, current heat exchange amount, and estimated heat exchange amount is the refrigerating capacity Q in the refrigeration mode or the heating capacity in the heating mode. Refer to Figure 6 the example shown. The outdoor heat exchanger temperature sensor 4 and the indoor heat exchanger temperature sensor 9 are respectively located on the outdoor heat exchanger 3 and the indoor heat exchanger 5. In the refrigeration mode, the condensation temperature T h and the evaporation temperature T l of the heat pump unit are respectively detected. The heating mode is the opposite. That is, the outdoor heat exchanger temperature sensor 4 and the indoor heat exchanger temperature sensor 9 are respectively located on the outdoor heat exchanger 3 and the indoor heat exchanger 5. In the heating mode, the evaporation temperature T l and the condensation temperature T h of the heat pump unit are respectively detected.

[0101] Since the estimation methods of the refrigerating capacity and the heating capacity are similar, in the following embodiments, the specific implementation process of the solution of the present invention is exemplarily described by taking the refrigerating capacity estimation as an example, and the heating mode refers to the refrigeration mode. Figure 7 It is the control flow schematic diagram of an embodiment of an indoor load side estimation device for a heat pump unit of the present invention. As Figure 7As shown, in the refrigeration mode, a device for predicting the indoor load side of a heat pump unit provided by the solution of the present invention includes:

[0102] Step 1: Before leaving the factory, test the refrigeration capacity of the heat pump unit (such as the refrigerating capacity Q of the heat pump unit). Since the refrigerating capacity Q of the heat pump unit is affected by the condensation temperature T h , evaporation temperature T l , and compressor frequency f, therefore, based on the test data of the heat pump unit before leaving the factory, establish the relationship between the condensation temperature T h , evaporation temperature T l , compressor frequency f and refrigerating capacity Q, that is, Q = F(T h , T1, f).

[0103] Among them, the relationship between the condensation temperature T h , evaporation temperature T l , compressor frequency f and refrigerating capacity Q, that is, Q = F(T h , T1, f), is the relationship between the refrigerating capacity Q of the heat pump unit and the condensation temperature T h , evaporation temperature T l , compressor frequency f. It should be noted that for different heat pump units, due to different configurations and controls, the relationship between the condensation temperature T h , evaporation temperature T l , compressor frequency f and refrigerating capacity Q, that is, Q = F(T h , T1, f) are all different, so the coefficients of each parameter in this relationship are different. The coefficients of the relationship between the refrigerating capacity Q of the heat pump unit and the condensation temperature T h , evaporation temperature T l , compressor frequency f are affected by various factors such as the size of the heat pump unit and the outdoor environment. Therefore, the specific coefficients of this relationship can only be determined under the conditions of specific heat pump unit configurations and specific usage environments.

[0104] Step 2: According to the relationship between the condensation temperature T h , evaporation temperature T l , compressor frequency f and refrigerating capacity Q, that is, Q = F(T h , T1, f), extract n groups of data (specifically n groups of test data). The refrigerating capacity Q corresponds to Q1, Q2, Q2,..., Q n . The condensation temperature corresponds to T h1 , T h2 , T h3 , ……, T hn . The evaporation temperature T 11 , T 12 , T 13 , ……, T 1n . The compressor frequency corresponds to f1, f2, f3, ……, fn , where n is a positive integer. Organize each set of data, establish a data table, and place the data table in the main control unit 12 of the heat pump unit.

[0105] Step 3: After the heat pump unit is started and runs for the set time t (the set time t is the fan stabilization time and can be 5 min), it can be considered that the air supply volume of the heat pump unit is stable at this time, and the condensation temperature T in the operating parameters of the heat pump unit can be obtained. h , evaporation temperature T l , and the measured data of the compressor frequency f, that is, the measured data of the parameters (T h , T1, f). According to the condensation temperature T h , evaporation temperature T l , and the relationship between the compressor frequency f and the refrigerating capacity Q, that is, Q = F(T h , T1, f), calculate the current refrigerating capacity Q of the heat pump unit based on the measured data of the condensation temperature T h , evaporation temperature T l , and compressor frequency f of the heat pump unit.

[0106] The acquisition unit 102 is further configured to, after the heat pump unit is started and runs for the first set time, acquire the current operating parameters of the heat pump unit, acquire the current air state parameters of the environment where the heat pump unit is located, acquire the current target temperature of the heat pump unit, and acquire the current outdoor temperature of the environment where the heat pump unit is located. The first set time is like the set time t, the current target temperature of the heat pump unit is like the user-set temperature T s , and the outdoor temperature of the environment where the heat pump unit is located is like the outdoor temperature T w . Refer to Figure 6 As shown in the example, the outdoor ambient temperature sensor 6 is located outdoors and is used to detect the outdoor temperature T w . For the specific functions and processing of this acquisition unit 102, refer to step S120.

[0107] The control unit 104 is configured to determine the set heat exchange amount of the heat pump unit corresponding to the set operating parameter of the heat pump unit that is the same as the current operating parameter of the heat pump unit in the first correspondence relationship as the current heat exchange amount of the heat pump unit corresponding to the current operating parameter of the heat pump unit. The current heat exchange amount of the heat pump unit is the current refrigerating capacity of the heat pump unit in the refrigeration mode and the current heating capacity of the heat pump unit in the heating mode. The current heat exchange amount of the heat pump unit is like the refrigerating capacity Q in the refrigeration mode. For the specific functions and processing of this control unit 104, refer to step S130.

[0108] The control unit 104 is further configured to determine the current air volume of the heat pump unit according to the current heat exchange amount of the heat pump unit and the current air state parameters of the environment where the heat pump unit is located. For the specific functions and processes of this control unit 104, refer to step S140.

[0109] In some embodiments, the current air state parameters of the environment where the heat pump unit is located include: the current return air temperature and the current return air moisture content, as well as the current supply air temperature and the current supply air moisture content of the environment where the heat pump unit is located.

[0110] Refer to Figure 6 In the example shown, the return air temperature and humidity sensor 1 is located at the return air outlet of the heat pump unit and is used to detect the return air temperature t1 and the return air moisture content d1 of the heat pump unit. The supply air temperature and humidity sensor (or supply air temperature and humidity sensor) 11 is located at the supply air outlet of the heat pump unit and is used to detect the supply air temperature t2 and the supply air moisture content d2 of the heat pump unit. The main control unit 12 of the heat pump unit is connected to the compressor 7, the outdoor ambient temperature sensor 6, the outdoor heat exchanger temperature sensor 4, the return air temperature and humidity sensor 1, the supply air temperature and humidity sensor 11, and the indoor heat exchanger temperature sensor 9.

[0111] The control unit 104 determines the current air volume of the heat pump unit according to the current heat exchange amount of the heat pump unit and the current air state parameters of the environment where the heat pump unit is located, including:

[0112] The control unit 104 is specifically further configured to determine the current return air enthalpy value of the heat pump unit based on the corresponding relationship among the set temperature, the set moisture content, and the set enthalpy value of the heat pump unit, according to the current return air temperature and the current return air moisture content of the environment where the heat pump unit is located. For the specific functions and processes of this control unit 104, refer to step S210.

[0113] The control unit 104 is specifically further configured to determine the current supply air enthalpy value of the heat pump unit based on the corresponding relationship among the set temperature, the set moisture content, and the set enthalpy value of the heat pump unit, according to the current supply air temperature and the current supply air moisture content of the environment where the heat pump unit is located. For the specific functions and processes of this control unit 104, refer to step S220.

[0114] The control unit 104 is specifically further configured to determine the current air volume of the heat pump unit based on the corresponding relationship among the set heat exchange amount, the set air volume, and the set supply air enthalpy value and the set return air enthalpy value of the heat pump unit, according to the current heat exchange amount of the heat pump unit, the current return air enthalpy value of the heat pump unit, and the current supply air enthalpy value of the heat pump unit. For the specific functions and processes of this control unit 104, refer to step S230.

[0115] Specifically, asFigure 7 As shown, in the refrigeration mode, an indoor load side prediction device for a heat pump unit provided by the solution of the present invention further includes:

[0116] Step 4: Through the temperature sensors and humidity sensors arranged at the air supply outlet and the air return outlet (i.e., the air supply temperature and humidity sensor 11 and the air return temperature and humidity sensor 1), obtain the air supply temperature t2, the air return temperature t1, the moisture content of the air supply d2, and the moisture content of the air return d1. According to the formula between temperature and moisture content (the enthalpy value of the air supply h2 and the enthalpy value of the air return h1 can be obtained. For example: the formula between temperature and moisture content can be h = 1.01t + 0.001d(2501 + 1.85t), where h is the enthalpy value, t is the temperature, and d is the moisture content.

[0117] Step 5: From the current cooling capacity Q of the heat pump unit calculated in Step 3, and the air state parameters (i.e., the enthalpy value of the air return h1 and the enthalpy value of the air supply h2) of the environment where the heat pump unit is located calculated in Step 4, ρ can be calculated according to the relationship ρ = F(t, d) between the air supply air density ρ, the dry bulb temperature t of the air supply, and the moisture content d of the air supply. From the calculation formula of the cooling capacity Q of the heat pump unit Q = qρ(h2 - h1), the air volume q of the heat pump unit can be determined.

[0118] Among them, for the air density ρ, the dry air density = (atmospheric pressure - water vapor partial pressure) / (dry air gas constant * dry bulb temperature), where the water vapor partial pressure can be obtained through the moisture content, the dry air gas constant is 287, and the dry bulb temperature uses the Kelvin temperature.

[0119] The control unit 104 is further configured to determine the predicted heat exchange amount of the heat pump unit according to the current target temperature of the heat pump unit, the current outdoor temperature of the heat pump unit, and the current air volume of the heat pump unit. For the specific functions and processing of this control unit 104, refer to Step S150.

[0120] In some embodiments, the control unit 104 determines the predicted heat exchange amount of the heat pump unit according to the current target temperature of the heat pump unit, the current outdoor temperature of the heat pump unit, and the current air volume of the heat pump unit, including:

[0121] The control unit 104 is specifically further configured to collect a set of the current heat exchange amount and the current air volume of the heat pump unit during the operation of the heat pump unit, and correspondingly record a set of the current target temperature and the current outdoor temperature of the heat pump unit. For the specific functions and processing of this control unit 104, refer to Step S310.

[0122] The control unit 104 is further specifically configured to perform fitting based on the current heat exchange amount, current air volume, current target temperature, and current outdoor temperature of a group of the heat pump units, so as to obtain the corresponding relationship among the current target temperature, current outdoor temperature, current air volume, and current heat exchange amount of the heat pump units, which is denoted as the corresponding relationship among the set target temperature, set outdoor temperature, set air volume, and set heat exchange amount of the heat pump units, and is used as the second corresponding relationship. For the specific functions and processing of this control unit 104, refer to step S320.

[0123] The control unit 104 is further specifically configured to determine the set heat exchange amount corresponding to the set target temperature that is the same as the current target temperature of the heat pump unit, the set outdoor temperature that is the same as the current outdoor temperature of the heat pump unit, and the set air volume that is the same as the current air volume of the heat pump unit in the second corresponding relationship as the estimated heat exchange amount of the heat pump unit. The estimated heat exchange amount of the heat pump unit at the next moment, such as the estimated refrigeration capacity Q' at the next moment in the refrigeration mode. For the specific functions and processing of this control unit 104, refer to step S330.

[0124] Specifically, as Figure 7 shown, in the refrigeration mode, an indoor load side estimation device for a heat pump unit provided by the solution of the present invention further includes:

[0125] Step 6: Collect a large amount of operation data, and fit out the linear relationship among the outdoor temperature T s under different set temperatures T w , air volume q, and refrigeration capacity Q' of the heat pump unit, that is, Q' = f(T s , T w , q), and establish a relevant table.

[0126] The linear relationship among the set temperature T s , outdoor temperature T w , air volume q, and refrigeration capacity Q' of the heat pump unit, that is, Q' = f(T s , T w , q), is a relational expression about the refrigeration capacity Q' and the set temperature T s , outdoor temperature T w , air volume q, which is fitted from a large amount of data obtained during the operation of the heat pump unit. For example, at a certain set temperature T s and a certain outdoor temperature T w , when the air volume of the heat pump unit is determined to be q, the refrigeration capacity Q' of the heat pump unit can be obtained. The coefficients of this relational expression are affected by factors such as the performance and configuration of the heat pump unit, and need to be obtained through a large amount of operation data.

[0127] Step 7: Based on the set temperature Ts , the outdoor temperature T w , the air volume q, and the linear relationship between the refrigerating capacity Q' of the heat pump unit, i.e., Q' = f(T s , T w , q), by setting the temperature T by the user s and the outdoor temperature T obtained by the outdoor temperature sensor w , and the air volume q of the heat pump unit, determine the refrigerating capacity Q' of the heat pump unit as the estimated refrigerating capacity Q' of the heat pump unit at the next moment.

[0128] The control unit 104 is further configured to determine the set operating parameter corresponding to the set heat exchange amount in the first correspondence relationship that is the same as the estimated heat exchange amount of the heat pump unit as the estimated operating parameter of the heat pump unit corresponding to the estimated heat exchange amount of the heat pump unit. For the specific functions and processing of the control unit 104, refer to step S160.

[0129] In some embodiments, the control unit 104 determines the set operating parameter corresponding to the set heat exchange amount in the first correspondence relationship that is the same as the estimated heat exchange amount of the heat pump unit as the estimated operating parameter of the heat pump unit corresponding to the estimated heat exchange amount of the heat pump unit, including the following two determination cases:

[0130] The first determination case: The control unit 104 is specifically further configured to, when the set operating parameter corresponding to the set heat exchange amount in the first correspondence relationship that is the same as the estimated heat exchange amount of the heat pump unit is one operating parameter, determine this one operating parameter as the estimated operating parameter of the heat pump unit corresponding to the estimated heat exchange amount of the heat pump unit.

[0131] The second determination case: The control unit 104 is specifically further configured to, when the set operating parameter corresponding to the set heat exchange amount in the first correspondence relationship that is the same as the estimated heat exchange amount of the heat pump unit is two or more operating parameters, determine the operating parameter with the highest energy efficiency of the heat pump unit among these two or more operating parameters as the estimated operating parameter of the heat pump unit corresponding to the estimated heat exchange amount of the heat pump unit.

[0132] Specifically, as Figure 7 shown, in the refrigeration mode, an indoor load side estimation device for a heat pump unit provided by the solution of the present invention further includes: Step 8, substitute the estimated refrigerating capacity Q' of the heat pump unit at the next moment into the data table in step 2 for verification, and extract the corresponding condensation temperature T h, the evaporation temperature T1 and the compressor frequency f, and operate as the operating parameters of the heat pump unit at the next moment. If, under the condition of the same estimated cooling capacity Q', there are corresponding operating parameters of multiple heat pump units, the heat pump unit is made to automatically extract the operating parameters with the highest energy efficiency for operation, so that the heat pump unit is in the most energy-saving operating state.

[0133] The control unit 104 is further configured to control the heat pump unit to operate according to the estimated operating parameters of the heat pump unit. For the specific functions and processes of this control unit 104, refer to step S170.

[0134] An indoor load side estimation device for a heat pump unit provided by the solution of the present invention selects n state points as the test points of the heat pump unit before the main unit of the heat pump unit leaves the factory, and obtains n sets of heat pump unit loads (i.e., cooling capacity Q), condensation temperature T h , evaporation temperature T1 and compressor frequency f data. Establish a relational expression of Q = F(T h , T1, f), and organize each data into a table, and place it as a data processing unit in the control unit 104 of the heat pump unit. During the operation of the heat pump unit, through a large amount of operation data, fit the linear relationship between the outdoor temperature T s , air volume q and the heat pump unit load (i.e., cooling capacity Q') of the heat pump unit at different set temperatures T w , and obtain the fluctuation of the heat pump unit load (i.e., cooling capacity Q') with respect to the outdoor temperature T w , air volume q and set temperature T s . Furthermore, through the outdoor temperature T w , air volume q and set temperature T s to obtain the estimated load (i.e., cooling capacity Q') of the heat pump unit, determine the required load (i.e., cooling capacity Q') of the heat pump unit at the next moment, extract the parameters of the heat pump unit in the data processing unit, and select the operating parameters with the highest energy efficiency, so that the heat pump unit is in the most energy-saving state, which not only ensures the efficient operation of the heat pump unit, improves user comfort, but also reduces energy consumption.

[0135] In some embodiments, in the control device of the heat pump unit described in the solution of the present invention, after determining the set operating parameters corresponding to the set heat exchange amount equal to the estimated heat exchange amount of the heat pump unit in the first corresponding relationship as the estimated operating parameters of the heat pump unit corresponding to the estimated heat exchange amount of the heat pump unit, it further includes: a process of adjusting the estimated operating parameters of the heat pump unit.

[0136] The control unit 104 is further configured to determine whether it receives an adjustment instruction from the user for the current air volume of the heat pump unit after determining the estimated operating parameters of the heat pump unit. For the specific functions and processes of this control unit 104, refer to step S410.

[0137] The control unit 104 is further configured to, if it is determined that an adjustment instruction for the current air volume of the heat pump unit has been received from the user, return to re-acquire the current operating parameters of the heat pump unit, re-acquire the current air state parameters of the environment where the heat pump unit is located, re-acquire the current target temperature of the heat pump unit, and re-acquire the current outdoor temperature of the environment where the heat pump unit is located after the heat pump unit has operated for a first set time, and then re-determine the current heat exchange amount and the current air volume of the heat pump unit to re-determine the estimated heat exchange amount of the heat pump unit. For the specific functions and processing of this control unit 104, refer to step S420.

[0138] The control unit 104 is further configured to, if it is determined that an adjustment instruction for the current air volume of the heat pump unit has not been received from the user, determine whether the current target temperature and the current outdoor environment temperature of the heat pump unit have changed: if so, determine the new current target temperature and the new current outdoor temperature of the heat pump unit, and return to re-determine the estimated heat exchange amount of the heat pump unit based on the new current target temperature, the new current outdoor temperature, and the current air volume of the heat pump unit. Otherwise, after controlling the heat pump unit to operate according to the current operating parameters of the heat pump unit for a second set time, determine whether the current target temperature and the current outdoor environment temperature of the heat pump unit have changed. For the specific functions and processing of this control unit 104, refer to step S430.

[0139] Specifically, as Figure 7 shown, in the cooling mode, an indoor load side estimation device for a heat pump unit provided by the solution of the present invention further includes:

[0140] After step 8, that is, after the heat pump unit is in the most energy-efficient operating state, it is determined whether the user adjusts the air volume q of the heat pump unit. If the user controls to adjust the air volume q of the heat pump unit, step 9 is executed. If the user does not control to adjust the air volume q of the heat pump unit, step 10 is executed.

[0141] Step 9: After operating for a set time t (the set time t is the fan stabilization time and can be 5 min), re-measure the condensation temperature T h , evaporation temperature T l , and the measurement data of the compressor frequency f, that is, the measurement data of the parameters (T h , T1, f) in the operating parameters of the heat pump unit. According to the condensation temperature T h , evaporation temperature T l , compressor frequency f, and the relationship between the refrigeration capacity Q, that is, Q = F(T h, T1, f), calculate the current cooling capacity Q of the heat pump unit based on the measured data of the condensation temperature T h and the evaporation temperature T l and the compressor frequency f. Then, re-enter the loop, that is, re-execute step 4.

[0142] Step 10: When the user does not control and adjust the air volume q of the heat pump unit, judge whether the outdoor temperature T w and the user-set temperature T s have changed.

[0143] In step 10, if the outdoor temperature T w and the user-set temperature T s have changed, return to step 7 to re-determine the heat pump unit's cooling capacity Q' based on the linear relationship between the set temperature T s , the outdoor temperature T w , the air volume q and the heat pump unit's cooling capacity Q', that is, Q' = f(T s , T w , q), and determine the heat pump unit's cooling capacity Q' through the user-set temperature T s and the outdoor temperature T obtained by the outdoor temperature sensor w , as well as the air volume q of the heat pump unit, as the estimated cooling capacity Q' of the heat pump unit at the next moment.

[0144] In step 10, if the outdoor temperature T w and the user-set temperature T s have not changed, keep the heat pump unit in its current operating state. After setting the time t1, return to step 10 to continue judging whether the outdoor temperature T w and the user-set temperature T s have changed.

[0145] The heat pump unit involved in the solution of the present invention is a water-cooled air-cooled system. In fact, it is not limited to this system and can also be applied to air-cooled air-cooled, water-cooled chilled water, and air-cooled chilled water systems. Only the parameters used need to be adjusted according to the system used.

[0146] In the solution of the present invention, determine the heat pump unit's cooling capacity Q' according to the user-set temperature T s and the outdoor temperature T w . When the heat pump unit's cooling capacity Q' reaches equilibrium with the indoor-side cooling load, the heat pump unit's cooling capacity Q' at this time is the indoor required cooling load, realizing load prediction. Check and verify the actual heat pump unit's cooling capacity Q and the estimated cooling capacity Q', and determine the heat pump unit's cooling capacity Q' at the next moment through weather forecasting, realizing the optimal control of the cooling capacity. Energy-saving device: Select the optimal heat pump unit parameters according to the heat pump unit's cooling capacity, make the heat pump unit operate in an efficient state, and make the heat pump unit parameters optimal to achieve energy saving.

[0147] Some solutions provide a control device for an air-conditioning heat pump unit and the control device, which controls the air-conditioning heat pump unit to operate at a preset opening of an energy regulating valve according to a desired temperature. The estimated operating load of the air-conditioning heat pump unit is obtained according to the current operating parameters of the vehicle. The preset opening of the energy regulating valve is adjusted according to the estimated operating load. The solution of the present invention saves more energy by reducing the input power of the compressor in the air-conditioning heat pump unit.

[0148] There are also some solutions that provide a large-space building air-conditioning dynamic load estimation and fresh air volume control device that integrates image information. By establishing a linear model of the personnel density in the building space, the change of the personnel density in the building space is estimated in real time, and the dynamic human load is calculated. However, only the influence of personnel changes on the indoor required load is concerned, and the factor that has the greatest influence on the indoor load is not concerned, which should be the outdoor temperature. The solution of the present invention considers factors such as indoor personnel, indoor heat dissipation equipment, and outdoor air temperature, which cause the indoor-side load to change continuously. Combining the user-set temperature, outdoor temperature, air volume, and the capacity of the heat pump unit, the indoor required load is estimated, which can ensure the accuracy of the estimation of the indoor required load.

[0149] There are also some solutions that provide a load estimation device, device, and heat pump unit equipment based on user portraits, which obtain the annual load curve and load prediction value of the target user. The annual load curve is decomposed according to multiple load fluctuation frequencies to obtain multiple load fluctuation frequency characteristic components. Cluster analysis is performed on the multiple load fluctuation frequency characteristic components to obtain multiple cluster center curves. Based on the multiple cluster center curves, the daily load characteristic curve is obtained. According to the daily load characteristic curve and the load prediction value, the daily load at multiple moments is obtained. The predicted daily load at multiple moments is obtained by Monte Carlo calculation of the daily load at multiple moments, but only the indoor load prediction is considered, and no optimization device for the operation of the heat pump unit is proposed. The solution of the present invention estimates the load of the heat pump unit, extracts the optimal parameter heat pump unit for adjustment, achieves rapid real-time update of the indoor-side load demand and efficient operation of the heat pump unit, ensures the efficient operation of the heat pump unit, and reduces energy consumption.

[0150] The solution provided by the present invention provides an indoor load-side estimation device for a heat pump unit. Taking the indoor cooling load estimation as an example, before leaving the factory, the relationship between the condensation temperature T h , evaporation temperature T l , compressor frequency f, and refrigeration capacity Q, that is, the relationship of Q = F(T h , T1, f), is determined through testing and is organized into a table form and built into the control unit 104 of the heat pump unit to achieve standardized selection of the heat pump unit capacity. During the operation of the heat pump unit, the user-set temperature T s , outdoor temperature Tw The relationship between the air volume q and the capacity Q' of the heat pump unit is used to estimate the load required by the heat pump unit at the next moment. In this way, considering factors such as indoor occupants, indoor heat dissipation equipment, and outdoor air temperature that cause the indoor-side load to change continuously, and combining the user-set temperature, outdoor temperature, air volume, and the capacity of the heat pump unit, the indoor required load is estimated, which can ensure the accuracy of the estimation of the indoor required load. Furthermore, by estimating the load of the heat pump unit and extracting the optimal parameter heat pump unit for adjustment, the load demand on the indoor side can be updated quickly and in real time, and the heat pump unit can operate efficiently, which not only ensures the efficient operation of the heat pump unit but also reduces energy consumption.

[0151] Since the processing and functions implemented by the device in this embodiment are basically corresponding to the embodiments, principles, and examples of the foregoing method, for the details not described in the description of this embodiment, reference can be made to the relevant descriptions in the foregoing embodiments and will not be elaborated here.

[0152] Adopting the technical solution of the present invention, taking the refrigeration mode as an example, based on the pre-set refrigerating capacity Q and condensation temperature T of the heat pump unit h and evaporation temperature T l in the relational formula between the compressor frequency f, according to the condensation temperature T during the actual operation of the heat pump unit h and evaporation temperature T l and compressor frequency f, calculate the refrigerating capacity Q during the actual operation of the heat pump unit; based on the calculation formula Q = qρ(h2 - h1) of the refrigerating capacity Q of the heat pump unit, according to the refrigerating capacity Q, air density ρ, supply air enthalpy value h2, and return air enthalpy value h1 during the actual operation of the heat pump unit, calculate the air volume q during the actual operation of the heat pump unit; collect the set temperature T s outdoor temperature T w air volume q, and refrigerating capacity Q' during the actual operation of the heat pump unit, and fit the relational formula between the set temperature T s outdoor temperature T w air volume q, and the refrigerating capacity Q' of the heat pump unit. According to the set temperature T s outdoor temperature T w and air volume q during the actual operation of the heat pump unit, calculate the refrigerating capacity Q' during the actual operation of the heat pump unit as the estimated refrigerating capacity Q' of the heat pump unit at the next moment; based on the pre-set relational formula between the refrigerating capacity Q and condensation temperature T h evaporation temperature T l and compressor frequency f of the heat pump unit, according to this estimated refrigerating capacity Q', determine the condensation temperature T h evaporation temperature T l, the compressor frequency f is used as the operating parameter of the heat pump unit at the next moment, to achieve the matching of the cooling capacity of the heat pump unit and the required cooling load indoors, so as to quickly and real-time update the load demand on the indoor side and ensure the efficient operation of the heat pump unit. This not only guarantees the efficient operation of the heat pump unit but also reduces energy consumption.

[0153] According to an embodiment of the present invention, there is also provided a heat pump unit corresponding to the control device of the heat pump unit. This heat pump unit may include: the control device of the heat pump unit described above.

[0154] Since the processing and functions realized by the heat pump unit in this embodiment are basically corresponding to the embodiments, principles, and examples of the foregoing device, for the details not described in the description of this embodiment, reference can be made to the relevant descriptions in the foregoing embodiments and will not be elaborated here.

[0155] Adopting the technical solution of the present invention, taking the cooling mode as an example, based on the pre-set relationship between the cooling capacity Q, condensation temperature T h , evaporation temperature T l , and compressor frequency f of the heat pump unit, according to the condensation temperature T h , evaporation temperature T l , and compressor frequency f during the actual operation of the heat pump unit, calculate the cooling capacity Q during the actual operation of the heat pump unit; based on the calculation formula Q = qρ(h2 - h1) of the cooling capacity Q of the heat pump unit, calculate the air volume q during the actual operation of the heat pump unit according to the cooling capacity Q, air density ρ, supply air enthalpy value h2, and return air enthalpy value h1 during the actual operation of the heat pump unit; collect the set temperature T s , outdoor temperature T w , air volume q, and cooling capacity Q' during the actual operation of the heat pump unit, and fit the relationship between the set temperature T s , outdoor temperature T w , air volume q, and the cooling capacity Q' of the heat pump unit. According to the set temperature T s , outdoor temperature T w , and air volume q during the actual operation of the heat pump unit, calculate the cooling capacity Q' during the actual operation of the heat pump unit as the estimated cooling capacity Q' of the heat pump unit at the next moment; based on the pre-set relationship between the cooling capacity Q, condensation temperature T h , evaporation temperature T l , and compressor frequency f of the heat pump unit, according to this estimated cooling capacity Q', determine the condensation temperature T h , evaporation temperature T l , and compressor frequency f as the operating parameters of the heat pump unit at the next moment, to achieve the matching of the cooling capacity of the heat pump unit and the required cooling load indoors, which not only guarantees the efficient operation of the heat pump unit, improves user comfort, but also reduces energy consumption.

[0156] According to an embodiment of the present invention, there is also provided a storage medium corresponding to a control method of a heat pump unit. The storage medium includes a stored program, wherein when the program runs, it controls the device where the storage medium is located to execute the above-mentioned control method of the heat pump unit.

[0157] Since the processing and functions implemented by the storage medium of this embodiment are basically corresponding to the embodiments, principles and examples of the foregoing method, for the details not described in detail in the description of this embodiment, reference can be made to the relevant descriptions in the foregoing embodiments, and details will not be repeated here.

[0158] Adopting the technical solution of the present invention, taking the refrigeration mode as an example, based on the pre-set relationship between the refrigerating capacity Q, the condensation temperature T h , the evaporation temperature T l , and the compressor frequency f of the heat pump unit, according to the condensation temperature T h , the evaporation temperature T l , and the compressor frequency f during the actual operation of the heat pump unit, calculate the refrigerating capacity Q during the actual operation of the heat pump unit; based on the calculation formula Q = qρ(h2 - h1) of the refrigerating capacity Q of the heat pump unit, according to the refrigerating capacity Q, the air density ρ, the supply air enthalpy value h2, and the return air enthalpy value h1 during the actual operation of the heat pump unit, calculate the air volume q during the actual operation of the heat pump unit; collect the set temperature T s , the outdoor temperature T w , the air volume q, and the refrigerating capacity Q' during the actual operation of the heat pump unit, fit out the relationship between the set temperature T s , the outdoor temperature T w , the air volume q, and the refrigerating capacity Q' of the heat pump unit, and according to the set temperature T s , the outdoor temperature T w , and the air volume q during the actual operation of the heat pump unit, calculate the refrigerating capacity Q' during the actual operation of the heat pump unit as the estimated refrigerating capacity Q' of the heat pump unit at the next moment; based on the pre-set relationship between the refrigerating capacity Q, the condensation temperature T h , the evaporation temperature T l , and the compressor frequency f of the heat pump unit, according to the estimated refrigerating capacity Q', determine the condensation temperature T h , the evaporation temperature T l , and the compressor frequency f corresponding to the estimated refrigerating capacity Q' as the operating parameters of the heat pump unit at the next moment, so as to realize the matching of the refrigerating capacity of the heat pump unit and the indoor required cooling load, and make the heat pump unit in the most energy-saving state.

[0159] In summary, it is easy for those skilled in the art to understand that, on the premise of no conflict, the above-mentioned advantageous ways can be freely combined and superimposed.

[0160] The above are only embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. A control method for a heat pump unit, characterized in that, Including: Retrieving the corresponding relationship between the set operating parameters of the heat pump unit stored in advance and the set heat transfer amount of the heat pump unit, denoted as the first corresponding relationship; After the heat pump unit is started and operates for a first set time, obtaining the current operating parameters of the heat pump unit, obtaining the current air state parameters of the environment where the heat pump unit is located, obtaining the current target temperature of the heat pump unit, and obtaining the current outdoor temperature of the environment where the heat pump unit is located; the current air state parameters of the environment where the heat pump unit is located include: the current return air temperature and current return air moisture content of the environment where the heat pump unit is located, as well as the current supply air temperature and current supply air moisture content; Determining the set heat transfer amount of the heat pump unit corresponding to the set operating parameter of the heat pump unit that is the same as the current operating parameter of the heat pump unit in the first corresponding relationship as the current heat transfer amount of the heat pump unit corresponding to the current operating parameter of the heat pump unit; Determining the current air volume of the heat pump unit according to the current heat transfer amount of the heat pump unit and the current air state parameters of the environment where the heat pump unit is located; Determining the estimated heat transfer amount of the heat pump unit according to the current target temperature of the heat pump unit, the current outdoor temperature of the heat pump unit, and the current air volume of the heat pump unit; based on the linear relationship between the set temperature Ts, outdoor temperature Tw, air volume q, and the refrigerating capacity Q' of the heat pump unit, i.e., Q' = f(Ts, Tw, q), determining the refrigerating capacity Q' of the heat pump unit through the set temperature Ts, the outdoor temperature Tw obtained by the outdoor temperature sensor, and the air volume q of the heat pump unit as the estimated refrigerating capacity Q' of the heat pump unit at the next moment; the current target temperature of the heat pump unit is the set temperature Ts, the current outdoor temperature of the heat pump unit is the outdoor temperature Tw, the current air volume of the heat pump unit is the air volume q, and the estimated heat transfer amount of the heat pump unit is the refrigerating capacity Q' of the heat pump unit; Determining the set operating parameter corresponding to the set heat transfer amount that is the same as the estimated heat transfer amount of the heat pump unit in the first corresponding relationship as the estimated operating parameter of the heat pump unit corresponding to the estimated heat transfer amount of the heat pump unit; Controlling the heat pump unit to operate according to the estimated operating parameter of the heat pump unit; wherein, the operating parameters in the set operating parameter of the heat pump unit, the current operating parameter of the heat pump unit, and the estimated operating parameter of the heat pump unit include: the condensation temperature, evaporation temperature, and compressor frequency of the heat pump unit.

2. The control method of the heat pump unit according to claim 1, wherein The first corresponding relationship is specifically a data table; in the data table, there are n groups of corresponding relationships between the set operating parameters of the heat pump unit and the set heat transfer amount of the heat pump unit, and n is a positive integer.

3. The control method of the heat pump unit according to claim 1 or 2, characterized in that Determining the current air volume of the heat pump unit according to the current heat transfer amount of the heat pump unit and the current air state parameters of the environment where the heat pump unit is located, including: Determining the current return air enthalpy value of the heat pump unit according to the current return air temperature and current return air moisture content of the environment where the heat pump unit is located; Determine the current supply air enthalpy value of the heat pump unit according to the current supply air temperature and the current moisture content of the supply air in the environment where the heat pump unit is located; Determine the current air volume of the heat pump unit according to the current heat transfer amount of the heat pump unit, the current return air enthalpy value of the heat pump unit, and the current supply air enthalpy value of the heat pump unit.

4. The control method of the heat pump unit according to any one of claims 1 to 3, characterized in that, Determine the estimated heat transfer amount of the heat pump unit according to the current target temperature of the heat pump unit, the current outdoor temperature of the heat pump unit, and the current air volume of the heat pump unit, including: During the operation of the heat pump unit, collect a set of the current heat transfer amount and the current air volume of the heat pump unit, and correspondingly record a set of the current target temperature and the current outdoor temperature of the heat pump unit; Based on a set of the current heat transfer amount, the current air volume, the current target temperature, and the current outdoor temperature of the heat pump unit, perform fitting to obtain the corresponding relationship between the current target temperature, the current outdoor temperature, the current air volume, and the current heat transfer amount of the heat pump unit, denoted as the corresponding relationship between the set target temperature, the set outdoor temperature, the set air volume, and the set heat transfer amount of the heat pump unit, as the second corresponding relationship; Determine the set heat transfer amount corresponding to the set target temperature that is the same as the current target temperature of the heat pump unit, the set outdoor temperature that is the same as the current outdoor temperature of the heat pump unit, and the set air volume that is the same as the current air volume of the heat pump unit in the second corresponding relationship as the estimated heat transfer amount of the heat pump unit.

5. The control method of the heat pump unit according to any one of claims 1 to 4, characterized in that, Determine the set operating parameters corresponding to the set heat transfer amount that is the same as the estimated heat transfer amount of the heat pump unit in the first corresponding relationship as the estimated operating parameters of the heat pump unit corresponding to the estimated heat transfer amount of the heat pump unit, including: When the set operating parameter corresponding to the set heat transfer amount that is the same as the estimated heat transfer amount of the heat pump unit in the first corresponding relationship is one operating parameter, determine this one operating parameter as the estimated operating parameter of the heat pump unit corresponding to the estimated heat transfer amount of the heat pump unit; When the set operating parameters corresponding to the set heat transfer amount that is the same as the estimated heat transfer amount of the heat pump unit in the first corresponding relationship are two or more operating parameters, determine the operating parameter with the highest energy efficiency among these two or more operating parameters as the estimated operating parameter of the heat pump unit corresponding to the estimated heat transfer amount of the heat pump unit.

6. The control method of the heat pump unit according to any one of claims 1 to 5, characterized in that, It also includes: After determining the estimated operating parameters of the heat pump unit, determine whether a regulation instruction for the current air volume of the heat pump unit is received from the user; If it is determined that a regulation instruction for the current air volume of the heat pump unit has been received from the user, then return to re-obtain the current operating parameters of the heat pump unit, re-obtain the current air state parameters of the environment where the heat pump unit is located, re-obtain the current target temperature of the heat pump unit, and re-obtain the current outdoor temperature of the environment where the heat pump unit is located after the heat pump unit operates for a first set time; If it is determined that no adjustment instruction for the current air volume of the heat pump unit is received from the user, it is determined whether the current target temperature and the current outdoor ambient temperature of the heat pump unit have changed: If so, the current target temperature and the current outdoor temperature of the new heat pump unit are determined and returned, so as to re-determine the estimated heat exchange amount of the heat pump unit according to the current target temperature of the new heat pump unit, the current outdoor temperature of the new heat pump unit, and the current air volume of the heat pump unit; Otherwise, after controlling the heat pump unit to operate according to the current operating parameters of the heat pump unit for a second set time, it is re-determined whether the current target temperature and the current outdoor ambient temperature of the heat pump unit have changed.

7. A control device for a heat pump unit, characterized in that, Including: An acquisition unit configured to retrieve the correspondence between the set operating parameters of the heat pump unit stored in advance and the set heat exchange amount of the heat pump unit, denoted as the first correspondence; The acquisition unit is further configured to, after the heat pump unit is started and operates for a first set time, acquire the current operating parameters of the heat pump unit, acquire the current air state parameters of the environment where the heat pump unit is located, acquire the current target temperature of the heat pump unit, and acquire the current outdoor temperature of the environment where the heat pump unit is located; The current air state parameters of the environment where the heat pump unit is located include: the current return air temperature and the current return air moisture content, as well as the current supply air temperature and the current supply air moisture content of the environment where the heat pump unit is located; A control unit configured to determine the set heat exchange amount of the heat pump unit corresponding to the set operating parameter of the heat pump unit that is the same as the current operating parameter of the heat pump unit in the first correspondence as the current heat exchange amount of the heat pump unit corresponding to the current operating parameter of the heat pump unit; The control unit is further configured to determine the current air volume of the heat pump unit according to the current heat exchange amount of the heat pump unit and the current air state parameters of the environment where the heat pump unit is located; The control unit is further configured to determine the estimated heat exchange amount of the heat pump unit according to the current target temperature of the heat pump unit, the current outdoor temperature of the heat pump unit, and the current air volume of the heat pump unit; Based on the linear relationship between the set temperature Ts, the outdoor temperature Tw, the air volume q, and the refrigerating capacity Q' of the heat pump unit, that is, Q' = f(Ts, Tw, q), the refrigerating capacity Q' of the heat pump unit is determined through the set temperature Ts, the outdoor temperature Tw obtained by the outdoor temperature sensor, and the air volume q of the heat pump unit, and used as the estimated refrigerating capacity Q' of the heat pump unit at the next moment; The current target temperature of the heat pump unit is the set temperature Ts, the current outdoor temperature of the heat pump unit is the outdoor temperature Tw, the current air volume of the heat pump unit is the air volume q, and the estimated heat exchange amount of the heat pump unit is the refrigerating capacity Q' of the heat pump unit; The control unit is further configured to determine the set operating parameter corresponding to the set heat exchange amount that is the same as the estimated heat exchange amount of the heat pump unit in the first correspondence as the estimated operating parameter of the heat pump unit corresponding to the estimated heat exchange amount of the heat pump unit; The control unit is further configured to control the heat pump unit to operate according to the estimated operating parameters of the heat pump unit; wherein, the operating parameters in the set operating parameters, the current operating parameters, and the estimated operating parameters of the heat pump unit include: the condensation temperature, the evaporation temperature, and the compressor frequency of the heat pump unit.

8. The control device of the heat pump unit according to claim 7, characterized in that, The first corresponding relationship is specifically a data table; in the data table, there are included n sets of corresponding relationships between the set operating parameters of the heat pump unit and the set heat exchange capacity of the heat pump unit, where n is a positive integer; Wherein, the operating parameters in the set operating parameters, the current operating parameters, and the estimated operating parameters of the heat pump unit include: the condensation temperature, the evaporation temperature, and the compressor frequency of the heat pump unit.

9. The control device of the heat pump unit according to claim 7 or 8, characterized in that The current air state parameters of the environment where the heat pump unit is located include: the current return air temperature and the current return air moisture content, as well as the current supply air temperature and the current supply air moisture content of the environment where the heat pump unit is located; The control unit determines the current air volume of the heat pump unit according to the current heat exchange capacity of the heat pump unit and the current air state parameters of the environment where the heat pump unit is located, including: Determining the current return air enthalpy value of the heat pump unit according to the current return air temperature and the current return air moisture content of the environment where the heat pump unit is located; Determining the current supply air enthalpy value of the heat pump unit according to the current supply air temperature and the current supply air moisture content of the environment where the heat pump unit is located; Determining the current air volume of the heat pump unit according to the current heat exchange capacity of the heat pump unit, the current return air enthalpy value of the heat pump unit, and the current supply air enthalpy value of the heat pump unit.

10. The control device of the heat pump unit according to any one of claims 7 to 9, characterized in that, The control unit determines the estimated heat exchange capacity of the heat pump unit according to the current target temperature of the heat pump unit, the current outdoor temperature of the heat pump unit, and the current air volume of the heat pump unit, including: During the operation of the heat pump unit, collecting a set of the current heat exchange capacity and the current air volume of the heat pump unit, and correspondingly recording a set of the current target temperature and the current outdoor temperature of the heat pump unit; Performing fitting based on a set of the current heat exchange capacity, the current air volume, the current target temperature, and the current outdoor temperature of the heat pump unit to obtain the corresponding relationship between the current target temperature, the current outdoor temperature, the current air volume, and the current heat exchange capacity of the heat pump unit, denoted as the corresponding relationship between the set target temperature, the set outdoor temperature, the set air volume, and the set heat exchange capacity of the heat pump unit, as the second corresponding relationship; Determining the set heat exchange capacity corresponding to the set target temperature that is the same as the current target temperature of the heat pump unit, the set outdoor temperature that is the same as the current outdoor temperature of the heat pump unit, and the set air volume that is the same as the current air volume of the heat pump unit in the second corresponding relationship as the estimated heat exchange capacity of the heat pump unit.

11. The control device of the heat pump unit according to any one of claims 7 to 10, characterized in that, The control unit determines the set operating parameters corresponding to the set heat transfer amount that is the same as the estimated heat transfer amount of the heat pump unit in the first correspondence relationship as the estimated operating parameters of the heat pump unit corresponding to the estimated heat transfer amount of the heat pump unit, including: When the set operating parameter corresponding to the set heat transfer amount that is the same as the estimated heat transfer amount of the heat pump unit in the first correspondence relationship is one operating parameter, determining this one operating parameter as the estimated operating parameter of the heat pump unit corresponding to the estimated heat transfer amount of the heat pump unit; When the set operating parameters corresponding to the set heat transfer amount that is the same as the estimated heat transfer amount of the heat pump unit in the first correspondence relationship are two or more operating parameters, determining the operating parameter with the highest energy efficiency of the heat pump unit among these two or more operating parameters as the estimated operating parameter of the heat pump unit corresponding to the estimated heat transfer amount of the heat pump unit.

12. The control device of the heat pump unit according to any one of claims 7 to 11, characterized in that, It further includes: The control unit is further configured to determine whether a regulation instruction for the current air volume of the heat pump unit is received after determining the estimated operating parameters of the heat pump unit; The control unit is further configured to, if it is determined that a regulation instruction for the current air volume of the heat pump unit has been received, return to re-obtain the current operating parameters of the heat pump unit, re-obtain the current air state parameters of the environment where the heat pump unit is located, re-obtain the current target temperature of the heat pump unit, and re-obtain the current outdoor temperature of the environment where the heat pump unit is located after the heat pump unit operates for a first set time; The control unit is further configured to, if it is determined that no regulation instruction for the current air volume of the heat pump unit is received, determine whether the current target temperature and the current outdoor environment temperature of the heat pump unit have changed: if so, determine the new current target temperature and the new current outdoor temperature of the heat pump unit, and return to re-determine the estimated heat transfer amount of the heat pump unit according to the new current target temperature of the heat pump unit, the new current outdoor temperature of the heat pump unit, and the current air volume of the heat pump unit; otherwise, control the heat pump unit to operate according to the current operating parameters of the heat pump unit for a second set time, and then re-determine whether the current target temperature and the current outdoor environment temperature of the heat pump unit have changed.

13. A heat pump unit, characterized in that, It includes: The control device of the heat pump unit according to any one of claims 7 to 12.

14. A storage medium, characterized in that, The storage medium includes a stored program, wherein when the program runs, it controls the device where the storage medium is located to execute the control method of the heat pump unit according to any one of claims 1 to 6.

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