Heat pump unit starting control method, device and equipment and storage medium

Abstract

The embodiment of the invention discloses a heat pump unit starting control method, device and equipment and a storage medium. After a heat pump unit enters a constant-temperature shutdown state, the first change rate of the environment temperature of a target area and the second change rate of the water temperature of an air source heat pump unit can be periodically detected; and according to the first change rate and the second change rate, whether immediate starting is needed and the starting power during immediate starting are determined. According to the embodiment of the invention, the heat pump unit determines whether to start or not and the initial state during starting by detecting the dynamic characteristics of the water temperature and the environment temperature change, and can more accurately judge the load condition to determine whether to start or not through the dual feedback of the water temperature change and the environment temperature change; the starting and stopping time of the air source heat pump unit is optimized, frequent starting of the heat pump unit is avoided, energy consumption of the heat pump unit is effectively reduced, and therefore the energy-saving effect and operation stability of the heat pump unit are improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of heat pump units, and in particular to a heat pump unit startup control method, device, equipment and storage medium. Background Art

[0002] Heat pump unit is an energy-saving device that uses high-level energy to make heat flow from low-level heat source to high-level heat source. Heat pump unit can convert low-level heat energy (heat contained in air) that cannot be directly used into high-level heat energy that can be used, thereby achieving the purpose of saving part of high-level energy (such as coal, gas, oil, electricity, etc.).

[0003] During the operation of the heat pump unit, in order to maintain a stable indoor temperature while reducing the energy consumption of the heat pump unit, the existing heat pump unit often determines the start-up time and shutdown time based on a fixed time or temperature difference, and the heat pump unit starts and stops according to the start-up time and shutdown time. However, this start-stop method will cause the heat pump unit to start frequently and cannot effectively reduce the energy consumption of the heat pump unit. Summary of the invention

[0004] The embodiments of the present invention provide a heat pump unit startup control method, device, equipment and storage medium, which solves the technical problem that the existing method of controlling the start and stop of the heat pump unit based on a fixed time or temperature difference cannot effectively reduce the energy consumption of the heat pump unit.

[0005] In a first aspect, an embodiment of the present invention provides a heat pump unit startup control method, which is applicable to a heat pump unit, wherein the heat pump unit is used to adjust the ambient temperature of a target area, and the method includes:

[0006] When the heat pump unit adjusts the ambient temperature of the target area to the target ambient temperature, the heat pump unit enters a constant temperature shutdown state, and periodically updates a first change rate of the ambient temperature of the target area and a second change rate of the water temperature of the heat pump unit;

[0007] At the end of each cycle, determining whether the heat pump unit needs to be started immediately based on the updated first change rate and second change rate;

[0008] In the case where immediate startup is required, determining a target startup power of the heat pump unit according to the first change rate and the second change rate;

[0009] The heat pump unit is controlled to start at the target startup power to readjust the ambient temperature of the target area to the target ambient temperature.

[0010] Wherein, determining whether the heat pump unit needs to be started immediately according to the updated first change rate and the second change rate includes:

[0011] determining whether the updated combination of the first change rate and the second change rate satisfies a unit startup condition;

[0012] When the unit startup condition is met, it is determined that the heat pump unit needs to be started immediately.

[0013] The step of determining whether the updated combination of the first change rate and the second change rate satisfies the unit startup condition includes:

[0014] Determine a ratio between the first change rate and a first preset change rate to obtain a first coefficient, wherein the first preset change rate is set based on the ambient temperature hysteresis of the heat pump unit;

[0015] Determine a ratio between the second change rate and a second preset change rate to obtain a second coefficient; the second preset change rate is set based on the water temperature hysteresis of the heat pump unit;

[0016] Whether the unit startup condition is met is determined according to the numerical interval of the first coefficient and the numerical interval of the second coefficient.

[0017] Wherein, determining the target startup power of the heat pump unit according to the first change rate and the second change rate includes:

[0018] determining a load type of the heat pump unit according to a combination of the first change rate and the second change rate;

[0019] According to the load type, the target startup power of the heat pump unit is determined.

[0020] Among them, it also includes:

[0021] In the case where immediate startup is not required, determining that the heat pump unit is delayed in starting;

[0022] Determine a delay time according to the first change rate and the second change rate, and continue to periodically update the first change rate and the second change rate during the delay time;

[0023] At the end of the delay time, determining whether the heat pump unit needs to be started immediately or continue to be delayed based on the most recently updated first change rate and the most recently updated second change rate;

[0024] In the case of continuing to delay the start, the delay time is updated according to the most recently updated first change rate and the most recently updated second change rate, and the delay start is continued.

[0025] The step of determining the delay time according to the first change rate and the second change rate includes:

[0026] determining a difference between a temperature change rate threshold and the first change rate;

[0027] Determining the product of the second change rate and a preset adjustment coefficient;

[0028] A quotient between the difference and the product is determined to obtain a delay time.

[0029] Among them, it also includes:

[0030] During the delayed start-up process, when it is detected that the ambient temperature is lower than the minimum temperature threshold, the water temperature is lower than the minimum water temperature threshold, or the first change rate is greater than the temperature change rate threshold, the heat pump unit is controlled to start with a preset start-up power to readjust the ambient temperature of the target area to the target ambient temperature.

[0031] In a second aspect, an embodiment of the present invention provides a heat pump unit startup control device, which is applicable to a heat pump unit, wherein the heat pump unit is used to adjust the ambient temperature of a target area, and the device includes:

[0032] A change rate updating module, for, when the heat pump unit adjusts the ambient temperature of the target area to the target ambient temperature, entering a constant temperature shutdown state, and periodically updating a first change rate of the ambient temperature of the target area and a second change rate of the water temperature of the heat pump unit;

[0033] A start-up judgment module, used for determining whether the heat pump unit needs to be started immediately at the end of each cycle according to the updated first change rate and second change rate;

[0034] A power determination module, configured to determine a target startup power of the heat pump unit according to the first change rate and the second change rate when immediate startup is required;

[0035] The unit starting module is used to control the heat pump unit to start at the target starting power to readjust the ambient temperature of the target area to the target ambient temperature.

[0036] In a third aspect, an embodiment of the present invention provides a heat pump unit startup control device, the heat pump unit startup control device comprising a processor and a memory;

[0037] The memory is used to store a computer program and transmit the computer program to the processor;

[0038] The processor is used to execute a heat pump unit startup control method as described in the first aspect according to instructions in the computer program.

[0039] In a fourth aspect, an embodiment of the present invention provides a storage medium storing computer executable instructions, wherein the computer executable instructions, when executed by a computer processor, are used to execute a heat pump unit startup control method as described in the first aspect.

[0040] As described above, the embodiment of the present invention provides a method, device, equipment and storage medium for starting control of a heat pump unit. After entering the constant temperature shutdown state, the heat pump unit of the embodiment of the present invention will periodically detect the first change rate of the ambient temperature of the target area and the second change rate of the water temperature of the air source heat pump unit, and determine whether it is necessary to start immediately and the startup power when starting immediately according to the first change rate and the second change rate. In the embodiment of the present invention, the heat pump unit detects the dynamic characteristics of the water temperature and the ambient temperature changes to determine whether it is necessary to start and the initial state when starting. Compared with the method of controlling the start of the heat pump unit based on a fixed time or temperature difference in the prior art, the embodiment of the present invention can more accurately judge the load situation to determine whether to start, optimize the start and stop time of the air source heat pump unit through the dual feedback of the water temperature change and the ambient temperature change, avoid the error caused by using the ambient temperature as the only control parameter, avoid the frequent start of the heat pump unit, effectively reduce the energy consumption of the heat pump unit, and thus improve the energy saving effect and operation stability of the heat pump unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 The present invention provides a flow chart of a heat pump unit startup control method.

[0042] Figure 2 A schematic diagram of a first change rate and a second change rate of a target area within 24 hours in winter provided by an embodiment of the present invention.

[0043] Figure 3 A schematic flow chart of another heat pump unit startup control solution provided in an embodiment of the present invention.

[0044] Figure 4 A schematic diagram of controlling the start-up of an air source heat pump unit provided in an embodiment of the present invention.

[0045] Figure 5 A schematic structural diagram of a startup control device for an air source heat pump unit provided in an embodiment of the present invention.

[0046] Figure 6 A schematic structural diagram of an air source heat pump unit startup control device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0047] The following description and accompanying drawings fully illustrate the specific embodiments of the present application so that those skilled in the art can practice them. The examples represent possible variations only. Unless explicitly required, separate components and functions are optional, and the order of operation can vary. The parts and features of some embodiments may be included in or replace the parts and features of other embodiments. The scope of the embodiments of the present application includes the entire scope of the claims, and all available equivalents of the claims. In this article, each embodiment may be represented individually or generally by the term "invention", which is only for convenience, and if more than one invention is disclosed in fact, it is not intended to automatically limit the scope of the application to any single invention or inventive concept. In this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, without requiring or implying any actual relationship or order between these entities or operations. Moreover, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method or device including a series of elements includes not only those elements, but also other elements that are not explicitly listed. The various embodiments are described in a progressive manner herein, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other. As for the structures, products, etc. disclosed in the embodiments, since they correspond to the parts disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0048] like Figure 1 As shown, Figure 1 The flowchart of a heat pump unit startup control method provided by an embodiment of the present invention. The heat pump unit startup control method provided by an embodiment of the present invention is applicable to a heat pump unit. In this embodiment, the heat pump unit is an air source heat pump unit as an example for explanation. The existing air source heat pump unit generally includes an air source heat pump main unit, a terminal heat exchanger, a water circulation system, a water side temperature sensor, an ambient temperature sensor, and a control unit. The functions of each module are as follows:

[0049] Air source heat pump main unit: used to absorb heat from the outside and transfer it to the terminal heat exchanger through the refrigerant.

[0050] Terminal heat exchanger: used to transfer heat to the indoor environment, including fan coil units or floor heating, where fan coil units drive air flow through fans, while floor heating heats the floor through hot water pipes.

[0051] Water circulation system: includes a water pump and inlet and outlet water pipes. The water pump is used to transport heated or cooled water from the air source heat pump main unit to the terminal heat exchanger through the inlet and outlet water pipes to form a closed-loop system.

[0052] Water side temperature sensor: installed on the inlet and outlet water pipes to measure the inlet and outlet water temperatures.

[0053] Ambient temperature sensor: installed in a specified area to measure the ambient temperature of the specified area.

[0054] Control unit: used to control the start and stop and power output of the heat pump unit.

[0055] It can be understood that the specific structure and working principle of the air source heat pump unit can refer to the prior art and will not be described in detail in this embodiment. In this embodiment, the ambient temperature sensor of the air source heat pump unit can be set in the target area. For example, the target area can be a certain indoor area. The control unit of the air source heat pump unit can obtain the ambient temperature collected by the ambient temperature sensor and the water temperature collected by the water side temperature sensor, and process the ambient temperature and the water temperature. The air source heat pump unit startup control method provided in the embodiment of the present invention can be executed by the control unit of the air source heat pump unit. The heat pump unit startup control method includes the following steps:

[0056] Step 101: When the heat pump unit adjusts the ambient temperature of the target area to the target ambient temperature, it enters a constant temperature shutdown state and periodically updates a first change rate of the ambient temperature of the target area and a second change rate of the water temperature of the heat pump unit.

[0057] In this embodiment, after the air source heat pump unit is started for the first time, it first determines the current ambient temperature of the target area collected by the ambient temperature sensor, and performs cooling or heating according to the difference between the target temperature set by the user and the ambient temperature, and adjusts the ambient temperature of the target area to the target ambient temperature. After the ambient temperature of the target area is adjusted to the target ambient temperature, the air source heat pump unit can enter the constant temperature shutdown state. At this time, the air source heat pump unit enters a relatively stable state, that is, it no longer continues to heat or cool, but at this time the air source heat pump unit may not be completely shut down, but is in a standby or low power consumption operation state to maintain the constant indoor temperature. In this embodiment, the air source heat pump unit will periodically detect the first change rate of the ambient temperature in the target area and the second change rate of the water temperature in the constant temperature shutdown state. Since the outlet water temperature and the inlet water temperature are the same in the constant temperature shutdown state, the second change rate of the water temperature can be the change rate of the outlet water temperature or the change rate of the inlet water temperature. In this embodiment, the second change rate is the change rate of the outlet water temperature as an example for explanation. In addition, the duration of each cycle can be set according to actual needs. For example, the cycle can be set to 5 minutes, that is, the air source heat pump unit updates the first change rate of the ambient temperature and the second change rate of the water temperature every 5 minutes. Specifically, the calculation formulas for the first change rate and the second change rate are as follows:

[0058]

[0059] Where Δt is the cycle interval, V W is the first rate of change, T W0 is the ambient temperature at the beginning of each cycle, T W1 At the end of each cycle, the ambient temperature, V R is the second rate of change, T R0 is the water temperature at the beginning of each cycle, T R1 The water temperature at the end of each cycle.

[0060] Step 102: At the end of each cycle, determine whether the heat pump unit needs to be started immediately based on the updated first change rate and second change rate.

[0061] In the constant temperature shutdown state, when each cycle ends, the air source heat pump unit will determine whether the air source heat pump unit needs to be started immediately based on the first change rate and the second change rate updated at the end of the cycle. In one embodiment, the air source heat pump unit can determine the terminal load based on the first change rate and the second change rate, and determine whether it needs to be started immediately based on the terminal load. In another embodiment, the air source heat pump unit can determine the interval where the second change rate is located, and determine the ambient temperature change condition corresponding to the interval. When the first change rate satisfies the ambient temperature change condition at the same time, it is determined that the air source heat pump unit needs to be started immediately. In another embodiment, the air source heat pump unit can also determine whether it needs to be started immediately by querying the startup judgment table, wherein the startup judgment table contains the combination of the ambient temperature change rate interval and the water temperature change rate interval corresponding to when the air source heat pump unit needs to be started immediately. The air source heat pump unit determines whether it needs to be started immediately by determining whether the first change rate and the second change rate can match the combination in the startup judgment table.

[0062] Step 103: When immediate startup is required, determine the target startup power of the heat pump unit according to the first change rate and the second change rate.

[0063] When the air source heat pump unit determines that it needs to be started immediately, it is necessary to further determine the target startup power at startup based on the first change rate and the second change rate. In one embodiment, the air source heat pump unit can determine the current load of the air source heat pump unit based on the first change rate and the second change rate, and determine the target startup power at startup based on the current load. Alternatively, it is determined whether it needs to be started immediately by querying a startup power table, wherein the startup power table contains a combination of ambient temperature change rate intervals and water temperature change rate intervals corresponding to different startup powers. The air source heat pump unit determines the target startup power by determining the matching result of the combination of the first change rate and the second change rate with the startup power table.

[0064] Step 104: Control the heat pump unit to start at the target startup power to readjust the ambient temperature of the target area to the target ambient temperature.

[0065] After determining the target startup power, the air source heat pump unit needs to be started at the target startup power to cool or heat the target area so as to adjust the ambient temperature to the target ambient temperature. It is understandable that after adjusting the ambient temperature of the target area to the target ambient temperature, the air source heat pump unit enters the constant temperature shutdown state again, and after re-entering the constant temperature shutdown state, it continues to periodically update the first change rate of the ambient temperature of the target area and the second change rate of the water temperature, so as to determine whether it needs to be started immediately and the target startup power when starting according to the first change rate and the second change rate in the constant temperature shutdown state.

[0066] As described above, an embodiment of the present invention provides a method for controlling the start-up of a heat pump unit. After the heat pump unit of the embodiment of the present invention enters the constant temperature shutdown state, it will periodically detect the first change rate of the ambient temperature of the target area and the second change rate of the water temperature of the air source heat pump unit, and determine whether it needs to be started immediately and the startup power when it is started immediately according to the first change rate and the second change rate. In the embodiment of the present invention, the heat pump unit detects the dynamic characteristics of the water temperature and the ambient temperature changes to determine whether it needs to be started and the initial state when it is started. Compared with the method of controlling the start-up of the heat pump unit based on a fixed time or temperature difference in the prior art, the embodiment of the present invention can more accurately judge the load situation to determine whether to start, optimize the start-up and shutdown time of the air source heat pump unit through the dual feedback of the water temperature change and the ambient temperature change, avoid the error caused by using the ambient temperature as the only control parameter, avoid the frequent start-up of the heat pump unit, effectively reduce the energy consumption of the heat pump unit, and thus improve the energy saving effect and operation stability of the heat pump unit.

[0067] Based on the above embodiment, in step 102, determining whether the heat pump unit needs to be started immediately according to the updated first change rate and the second change rate includes:

[0068] Step 1021: Determine whether the updated combination of the first change rate and the second change rate meets the unit startup condition.

[0069] In this embodiment, when determining whether the heat pump unit needs to be started immediately based on the first change rate and the second change rate updated at the end of the cycle, it is necessary to determine whether the combination of the first change rate and the second change rate meets the unit start-up condition. Exemplarily, since the second change rate may be in different numerical ranges, the start-up thresholds corresponding to the different numerical ranges can be pre-set, and the unit start-up condition is set to: the first change rate must reach the start-up threshold corresponding to the numerical range where the second change rate is located. In another embodiment, it is also possible to determine whether the updated combination of the first change rate and the second change rate meets the unit start-up condition in the following manner:

[0070] Step 10211, determine the ratio between the first change rate and the first preset change rate to obtain a first coefficient, and the first preset change rate is set based on the ambient temperature hysteresis of the heat pump unit.

[0071] In this embodiment, a first preset change rate needs to be pre-set, and the first preset change rate needs to be set based on the ambient temperature hysteresis of the heat pump unit. Exemplarily, the calculation formula of the first preset change rate K1 is: The first preset coefficient needs to be set in advance, and is generally set to 2.5. Generally speaking, the range of the ambient temperature hysteresis of the heat pump unit is generally within 1.5° to 2.5°. Assuming that the ambient temperature hysteresis is 2.5 degrees, the first preset change rate K1 is 1°C / hour. After determining the first preset change rate, it is necessary to further determine the ratio between the first change rate and the first preset change rate to obtain the first coefficient.

[0072] Step 10212: determine the ratio between the second change rate and the second preset change rate to obtain a second coefficient; the second preset change rate is set based on the water temperature hysteresis of the heat pump unit.

[0073] Similarly, in this embodiment, a second preset change rate needs to be pre-set, and the second preset change rate needs to be set based on the water temperature hysteresis of the heat pump unit. Exemplarily, the calculation formula of the second preset change rate K2 is: The second preset coefficient needs to be set in advance, and is generally set to 5. Generally speaking, the water temperature hysteresis of the heat pump unit generally ranges from 5° to 10°. Assuming that the water temperature hysteresis is 5 degrees, the second preset change rate K2 is 1°C / hour. After determining the second preset change rate, it is necessary to further determine the ratio between the second change rate and the second preset change rate to obtain the second coefficient.

[0074] Step 10213: Determine whether the unit startup conditions are met based on the numerical interval of the first coefficient and the numerical interval of the second coefficient.

[0075] Finally, whether the unit startup condition is met can be determined based on the numerical interval of the first coefficient and the numerical interval of the second coefficient. In one embodiment, when the combination of the first change rate and the second change rate meets the conditions in Table 1, it is determined that the unit startup condition is met.

[0076] Table 1

[0077] Water temperature change rate ΔTw (℃ / hour) Ambient temperature change rate ΔTr (℃ / hour) Startup Status <h2 style=";text-align:left;direction:ltr"><![CDATA[>5K2]]><h2 style=";text-align:left;direction:ltr"> <![CDATA[>2.5K1]]> Start now <h2 style=";text-align:left;direction:ltr"><![CDATA[>5K2]]><h2 style=";text-align:left;direction:ltr"> <![CDATA[(2.0~2.5)K1]]> Start now <![CDATA[(3.5~5.0)K2]]> <![CDATA[>2.5K1]]> Start now <![CDATA[(3.5~5.0)K2]]> <![CDATA[(2.0~2.5)K1]]> Start now <![CDATA[(0.5~3.5)K2]]> <![CDATA[>2.5K1]]> Start now

[0078] Step 1022: When the unit startup conditions are met, determine that the heat pump unit needs to be started immediately.

[0079] When it is determined that the first change rate and the second change rate meet the unit startup conditions, it is determined that the air source heat pump unit needs to be started immediately. When it is determined that the air source heat pump unit needs to be started immediately, it is necessary to further determine the power of the air source heat pump unit when it is started. Based on the above embodiment, the target startup power of the heat pump unit is determined according to the first change rate and the second change rate in step 103, including:

[0080] Step 1031: Determine the load type of the heat pump unit according to a combination of the first change rate and the second change rate.

[0081] Step 1032: Determine the target startup power of the heat pump unit according to the load type.

[0082] In this embodiment, it is necessary to determine the load type of the heat pump unit according to the combination of the first change rate and the second change rate, and the load type is used to reflect the size of the terminal load of the air source heat pump unit. Exemplarily, the load type is sorted from large to small according to the load: overload, heavier load, heavy load, moderate load, light load, low load, and no load. The startup power corresponding to the overload is the maximum power, the startup power corresponding to the heavier load is high power, the startup power corresponding to the heavy load is medium-high power, the startup power corresponding to the moderate load is medium power, the startup power corresponding to the light load is low power, and the startup power corresponding to the low load is low power. There is no need to start if there is no load. For the combination of the first change rate and the second change rate in Table 1, the corresponding load type and target startup power are shown in Table 2:

[0083] Table 2

[0084]

[0085] As shown in Table 2, when the load type is an overload, the corresponding target startup power is the maximum power, and when the load type is a heavy load, the corresponding target startup power is a high power, and when the load type is a relatively heavy load, the corresponding target startup power is a medium-high power.

[0086] As described above, the embodiment of the present invention determines the load condition of the terminal through a combination of the first change rate and the second change rate, and determines the startup power method at startup based on the load condition, thereby ensuring that the ambient temperature of the target area can quickly return to the target ambient temperature set by the user, thereby improving the user experience.

[0087] It should be noted that during the operation of the air source heat pump unit, when it is detected that the load at the terminal is light, the air source heat pump unit will delay starting. In addition, in winter, solar radiation will cause the ambient temperature of the target area to rise, which will have a direct impact on the first change rate and the second change rate, affecting the terminal load. For example, Figure 2 As shown, Figure 2 A schematic diagram of a first change rate and a second change rate of a target area within 24 hours in winter provided by an embodiment of the present invention, Figure 2 The horizontal axis is time, in hours, from 0 to 23 o'clock, and the vertical axis is the rate of change, in degrees Celsius per hour. During the day, under direct sunlight, the indoor ambient temperature rises, and the first rate of change becomes smaller and smaller, while at night, the indoor ambient temperature drops, and the first rate of change gradually increases. Especially when the target area faces the sun, when the sun is directly shining, the heat of the sun can make up for the heat loss when the air source heat pump system is shut down. Therefore, the air source heat pump unit can adjust the start time according to the direct sunlight to further improve the energy utilization efficiency. For example, when the air source heat pump unit detects that the ambient temperature of the target area has risen, the air source heat pump unit determines that the load at the end is small and delays the start. Specifically, direct sunlight will have a direct impact on the first rate of change of the ambient temperature. The first rate of change of the ambient temperature and the second rate of change of the water temperature are parameters for the air source heat pump unit to determine whether to delay the start. Larger water temperature changes and slower ambient temperature change rates will cause the air source heat pump system to delay the start.

[0088] The embodiment of the present invention also provides another heat pump unit startup control method, such as Figure 3 As shown, Figure 3 A schematic diagram of another heat pump unit startup control solution provided by an embodiment of the present invention, Figure 3 The heat pump unit startup control method shown is a specific implementation of the above heat pump unit startup method, and includes the following steps:

[0089] Step 201: When the heat pump unit adjusts the ambient temperature of the target area to the target ambient temperature, it enters a constant temperature shutdown state and periodically updates a first change rate of the ambient temperature of the target area and a second change rate of the water temperature of the heat pump unit.

[0090] Step 202: At the end of each cycle, determine whether the heat pump unit needs to be started immediately based on the updated first change rate and second change rate.

[0091] Step 203: When immediate startup is required, determine the target startup power of the heat pump unit according to the first change rate and the second change rate.

[0092] Step 204: Control the heat pump unit to start at the target startup power to readjust the ambient temperature of the target area to the target ambient temperature.

[0093] Step 205: When immediate startup is not required, determine that the heat pump unit should be started later.

[0094] Step 206: Determine a delay time according to the first change rate and the second change rate, and continue to periodically update the first change rate and the second change rate during the delay time.

[0095] In this embodiment, when the air source heat pump unit determines that it does not need to start immediately, it determines that it needs to be started late. In the case of determining that it needs to be started late, the heat pump unit needs to further determine the delay time according to the first change rate and the second change rate. Specifically, in this embodiment, the delay time corresponding to different combinations of the first change rate and the second change rate can be set, as shown in Table 3 for example.

[0096] Table 3

[0097]

[0098] The air source heat pump unit can determine the delayed start time according to the combination of the first change rate and the second change rate in Table 3.

[0099] In another embodiment, the delay time may also be determined dynamically according to the first change rate and the second change rate. Specifically, determining the delay time according to the first change rate and the second change rate includes:

[0100] Step 2061: Determine the difference between the temperature change rate threshold and the first change rate.

[0101] Step 2062: Determine the product of the second change rate and the preset adjustment coefficient.

[0102] Step 2063: Determine the quotient between the difference and the product to obtain the delay time.

[0103] Specifically, the calculation formula for the delay time in this embodiment is as follows:

[0104]

[0105] Among them, T delay is the delay time, ΔT this the temperature change rate threshold, which needs to be set in advance, and k is the adjustment coefficient, which indicates the difference in sensitivity between the water temperature change rate and the ambient temperature change rate, and is usually a positive number (e.g., 2.5). For example, assuming that the first change rate ΔTr = 1°C / hour and the second change rate ΔTw = 5°C / hour, the set temperature change rate threshold ΔT th =5℃ / hour, adjustment coefficient k=1, substituting into the above formula, we can get T delay = 0.8 hours = 48 minutes, that is, the air source heat pump unit will delay for 48 minutes before determining whether it needs to be started.

[0106] In another embodiment, the air source heat pump unit can also obtain weather forecast information for the location of the target area, and predict the sunshine intensity based on the weather forecast information to calculate the possible delay time in advance. Alternatively, the delayed start strategy of the target area can be optimized through historical long-term indoor and outdoor temperature data. For example, the delay time of a south-facing room may be longer due to the influence of sunshine, while a north-facing room almost does not need to be delayed.

[0107] After determining the delay time, the air source heat pump unit can delay starting according to the delay time. During the delayed start process, the air source heat pump unit will continue to detect the ambient temperature and water temperature of the target area, and periodically update the first change rate and the second change rate.

[0108] In addition, it should be noted that during the delayed start-up process, when the air source heat pump unit detects that the ambient temperature is less than the minimum temperature threshold, the water temperature is less than the minimum water temperature threshold, or the first change rate is greater than the temperature change rate threshold, it needs to be started with the preset startup power to readjust the ambient temperature of the target area to the target ambient temperature. The minimum temperature threshold and the minimum water temperature threshold can be set according to the actual needs of the user, and are not specifically limited in this embodiment. In addition, the preset startup power is a pre-set startup power, and the preset startup power also needs to be set in advance.

[0109] Step 207: When the delay time ends, determine whether the heat pump unit needs to be started immediately or continue to delay starting according to the most recently updated first change rate and the most recently updated second change rate.

[0110] After the delay time ends, the air source heat pump unit can determine whether the air source heat pump unit needs to start immediately or continue to delay the start according to the most recently updated first change rate and the most recently updated second change rate. Specifically, as shown in Table 4. Table 4 shows whether the air source heat pump unit needs to start immediately or continue to delay the start under different combinations of the first change rate and the second change rate.

[0111] Table 4

[0112]

[0113]

[0114] Step 208: In the case of continuing delayed start, update the delay time and continue delayed start according to the most recently updated first change rate and the most recently updated second change rate.

[0115] After the delay time is reached, if it is determined that the delay needs to be continued according to the first change rate and the second change rate, the delay time is updated and the start-up is continued to be delayed according to the most recently updated first change rate and the most recently updated second change rate. Figure 4 As shown, Figure 4 A schematic diagram of controlling the start-up of an air source heat pump unit provided in an embodiment of the present invention.

[0116] Specifically, this embodiment illustrates the effects that can be brought about by applying the air source heat pump unit startup control method provided by this embodiment in different regions.

[0117] (1) Application in Beijing

[0118] Climate characteristics: The outdoor temperature in winter is about -5℃ to -10℃, and there is strong direct sunlight during the day, which causes the indoor ambient temperature to drop at a low rate during the day and drop rapidly at night.

[0119] Application scenarios:

[0120] When the sun is directly shining during the day, the second change rate of the water temperature is relatively fast, and the first change rate of the indoor ambient temperature is slower. The air source heat pump unit determines the load type based on the first change rate and the second change rate and can delay startup to avoid energy waste.

[0121] When there is no direct sunlight at night, the second rate of change of water temperature and the first rate of change of indoor ambient temperature accelerate. The air source heat pump unit judges that the load has increased and starts in time to keep the indoor temperature constant.

[0122] The present invention can flexibly cope with the large temperature difference between day and night in Beijing in winter. The temperature in Beijing is relatively low in winter, but the climate is relatively dry and the sunshine conditions are good. The present invention judges the terminal load by combining the second change rate of water temperature and the first change rate of indoor ambient temperature, thereby effectively improving the energy efficiency ratio of the system and optimizing energy use while ensuring comfort.

[0123] (2) Application in Harbin

[0124] Climate characteristics: The winter is extremely cold, with an average daytime temperature of about -15℃ to -20℃, and nighttime temperatures can drop below -30℃. The indoor temperature has a high rate of change, especially when the machine is shut down.

[0125] Application scenarios:

[0126] High-load conditions: Since the second change rate of water temperature and the first change rate of indoor ambient temperature drop rapidly in a low-temperature environment, the air source heat pump unit can adjust the startup power in real time by judging the load type to ensure rapid warming of the indoor environment.

[0127] Low-load conditions: Even if the outdoor temperature is extremely low, when the indoor ambient temperature drops slowly due to the strong insulation effect, the air source heat pump unit can appropriately delay the startup time, thereby optimizing energy use.

[0128] By targeting the special low temperature environment in Harbin, the air source heat pump unit can maintain high energy efficiency in severe cold weather while ensuring user comfort.

[0129] (3) Application in Gansu

[0130] Climate characteristics: The winter temperature in northern Gansu is between -10℃ and -15℃, with longer sunshine hours. The temperature in the south is slightly higher but the humidity is lower.

[0131] Application scenarios:

[0132] Dry and cold areas in the north: The second change rate of water temperature is faster during the day, but the first change rate of indoor ambient temperature is slower due to the influence of sunlight. The air source heat pump unit can flexibly adjust the startup time according to the influence of sunlight to reduce unnecessary energy consumption.

[0133] Complex climate zone in the south: Due to the complex and changing climate conditions, the air source heat pump unit can adjust the load judgment in real time according to different weather conditions, and ensure that users are always in a comfortable temperature environment through accurate analysis of the second change rate of water temperature and the first change rate of indoor ambient temperature.

[0134] By targeting the diverse climate in Gansu, the air source heat pump unit startup control method provided by the embodiment of the present invention has a wide range of applications and can flexibly adjust the startup strategy under different climatic conditions to improve overall efficiency.

[0135] The heat pump unit in the embodiment of the present invention determines whether the air source heat pump unit needs to be started and the initial state when starting by detecting the dynamic characteristics of the water temperature and the ambient temperature changes. Compared with the method of controlling the start of the heat pump unit based on a fixed time or temperature difference in the prior art, the embodiment of the present invention can more accurately judge the load situation to determine whether to start through the dual feedback of the water temperature change and the ambient temperature change, avoid the error caused by using the ambient temperature as the only control parameter, avoid frequent start-ups of the heat pump unit, effectively reduce the energy consumption of the heat pump unit, and thus improve the energy saving effect and operation stability of the heat pump unit.

[0136] This embodiment also provides an air source heat pump unit startup control device, such as Figure 5 As shown, Figure 5 The schematic diagram of the structure of a start-up control device for an air source heat pump unit provided in an embodiment of the present invention is applicable to a heat pump unit, and the heat pump unit is used to adjust the ambient temperature of a target area. The start-up control device for the heat pump unit includes:

[0137] The change rate updating module 301 is used to enter the constant temperature shutdown state when the heat pump unit adjusts the ambient temperature of the target area to the target ambient temperature, and periodically update the first change rate of the ambient temperature of the target area and the second change rate of the water temperature of the heat pump unit;

[0138] A start-up judgment module 302 is used to determine whether the heat pump unit needs to be started immediately based on the updated first change rate and second change rate at the end of each cycle;

[0139] The power determination module 303 is used to determine the target startup power of the heat pump unit according to the first change rate and the second change rate when immediate startup is required;

[0140] The unit starting module 304 is used to control the heat pump unit to start at the target starting power to readjust the ambient temperature of the target area to the target ambient temperature.

[0141] The startup determination module 302 includes:

[0142] A condition judgment submodule, used to determine whether the updated combination of the first change rate and the second change rate meets the unit startup condition;

[0143] The start determination submodule is used to determine whether the heat pump unit needs to be started immediately when the unit start conditions are met.

[0144] Among them, the condition judgment submodule includes:

[0145] A first coefficient calculation unit, used to determine a ratio between a first change rate and a first preset change rate to obtain a first coefficient, wherein the first preset change rate is set based on an ambient temperature hysteresis of the heat pump unit;

[0146] A second coefficient calculation unit is used to determine the ratio between the second change rate and the second preset change rate to obtain a second coefficient; the second preset change rate is set based on the water temperature hysteresis of the heat pump unit;

[0147] The startup judgment unit is used to determine whether the unit startup condition is met according to the numerical interval of the first coefficient and the numerical interval of the second coefficient.

[0148] The power determination module 303 includes:

[0149] A load determination submodule, for determining a load type of the heat pump unit according to a combination of the first change rate and the second change rate;

[0150] The power determination submodule is used to determine the target startup power of the heat pump unit according to the load type.

[0151] Among them, it also includes:

[0152] A delay determination module, used to determine the delayed start of the heat pump unit when immediate start is not required;

[0153] A delay time determination module, used to determine the delay time according to the first change rate and the second change rate, and continue to periodically update the first change rate and the second change rate within the delay time;

[0154] A delay end judgment module is used to determine whether the heat pump unit needs to be started immediately or continue to delay the start according to the most recently updated first change rate and the most recently updated second change rate at the end of the delay time;

[0155] The delay time updating module is used to update the delay time and continue the delayed start according to the most recently updated first change rate and the most recently updated second change rate when the delayed start is continued.

[0156] Wherein, the delay time determination module includes:

[0157] A difference determination submodule, used to determine the difference between the temperature change rate threshold and the first change rate;

[0158] A product determination submodule, used to determine the product of the second change rate and a preset adjustment coefficient;

[0159] The delay time determination submodule is used to determine the quotient between the difference and the product to obtain the delay time.

[0160] Among them, it also includes:

[0161] The preset power start-up module is used to control the heat pump unit to start with a preset start-up power during the delayed start-up process, when it is detected that the ambient temperature is lower than the minimum temperature threshold, the water temperature is lower than the minimum water temperature threshold, or the first change rate is greater than the temperature change rate threshold, so as to readjust the ambient temperature of the target area to the target ambient temperature.

[0162] The air source heat pump unit startup control device provided in the embodiment of the present invention is included in the air source heat pump unit startup control equipment, and can be used to execute the air source heat pump unit startup control method provided in the above embodiment, and has corresponding functions and beneficial effects.

[0163] It is worth noting that in the embodiment of the above-mentioned air source heat pump unit startup control device, the various units and modules included are only divided according to functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be achieved; in addition, the specific names of the functional units are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of the present invention.

[0164] This embodiment also provides an air source heat pump unit startup control device, such as Figure 6 As shown, Figure 6 A schematic diagram of the structure of an air source heat pump unit startup control device provided in an embodiment of the present invention, the air source heat pump unit startup control device 40 includes a processor 400 and a memory 401;

[0165] The memory 401 is used to store the computer program 402 and transmit the computer program 402 to the processor 400;

[0166] The processor 400 is used to execute the steps in the above-mentioned embodiment of the air source heat pump unit startup control method according to the instructions in the computer program 402.

[0167] Exemplarily, the computer program 402 may be divided into one or more modules / units, one or more modules / units are stored in the memory 401, and are executed by the processor 400 to complete the present application. One or more modules / units may be a series of computer program instruction segments capable of completing specific functions, and the instruction segments are used to describe the execution process of the computer program 402 in the air source heat pump unit startup control device 40.

[0168] The air source heat pump unit startup control device 40 can be a computing device such as a desktop computer, a notebook, a palm computer, and a cloud server. The air source heat pump unit startup control device 40 can include, but is not limited to, a processor 400 and a memory 401. Those skilled in the art can understand that Figure 6 It is only an example of the air source heat pump unit start-up control device 40 and does not constitute a limitation of the air source heat pump unit start-up control device 40. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the air source heat pump unit start-up control device 40 may also include input and output devices, network access devices, buses, etc.

[0169] The processor 400 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0170] The memory 401 may be an internal storage unit of the air source heat pump unit startup control device 40, such as a hard disk or memory of the air source heat pump unit startup control device 40. The memory 401 may also be an external storage device of the air source heat pump unit startup control device 40, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the air source heat pump unit startup control device 40. Further, the memory 401 may also include both the internal storage unit and the external storage device of the air source heat pump unit startup control device 40. The memory 401 is used to store computer programs and other programs and data required by the air source heat pump unit startup control device 40. The memory 401 may also be used to temporarily store data that has been output or is to be output.

[0171] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0172] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0173] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0174] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0175] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store computer programs.

[0176] The embodiment of the present invention further provides a storage medium containing computer executable instructions, which are used to execute a method for starting and controlling an air source heat pump unit when executed by a computer processor. The method includes the following steps:

[0177] When the heat pump unit adjusts the ambient temperature of the target area to the target ambient temperature, the heat pump unit enters a constant temperature shutdown state, and periodically updates a first change rate of the ambient temperature of the target area and a second change rate of the water temperature of the heat pump unit;

[0178] At the end of each cycle, determining whether the heat pump unit needs to be started immediately based on the updated first change rate and second change rate;

[0179] In the case of immediate startup, determining the target startup power of the heat pump unit according to the first change rate and the second change rate;

[0180] The heat pump unit is controlled to start at the target startup power to readjust the ambient temperature of the target area to the target ambient temperature.

[0181] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the embodiments of the present invention are not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the embodiments of the present invention. Therefore, although the embodiments of the present invention are described in more detail through the above embodiments, the embodiments of the present invention are not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the embodiments of the present invention, and the scope of the embodiments of the present invention is determined by the scope of the appended claims.

Claims

1. A heat pump unit startup control method, characterized in that: Applicable to a heat pump unit, the heat pump unit is used to adjust the ambient temperature of a target area, the method comprises: When the heat pump unit adjusts the ambient temperature of the target area to the target ambient temperature, the heat pump unit enters a constant temperature shutdown state, and periodically updates a first change rate of the ambient temperature of the target area and a second change rate of the water temperature of the heat pump unit; At the end of each cycle, determining whether the heat pump unit needs to be started immediately based on the updated first change rate and second change rate; In the case where immediate startup is required, determining a target startup power of the heat pump unit according to the first change rate and the second change rate; The heat pump unit is controlled to start at the target startup power to readjust the ambient temperature of the target area to the target ambient temperature.

2. A heat pump unit startup control method according to claim 1, characterized in that: The step of determining whether the heat pump unit needs to be started immediately according to the updated first change rate and second change rate includes: determining whether the updated combination of the first change rate and the second change rate satisfies a unit startup condition; When the unit startup condition is met, it is determined that the heat pump unit needs to be started immediately.

3. A heat pump unit startup control method according to claim 2, characterized in that: The step of determining whether the updated combination of the first change rate and the second change rate satisfies the unit startup condition comprises: Determine a ratio between the first change rate and a first preset change rate to obtain a first coefficient, wherein the first preset change rate is set based on the ambient temperature hysteresis of the heat pump unit; Determine a ratio between the second change rate and a second preset change rate to obtain a second coefficient; the second preset change rate is set based on the water temperature hysteresis of the heat pump unit; Whether the unit startup condition is met is determined according to the numerical interval of the first coefficient and the numerical interval of the second coefficient.

4. A heat pump unit startup control method according to claim 1, characterized in that: The step of determining the target startup power of the heat pump unit according to the first change rate and the second change rate includes: determining a load type of the heat pump unit according to a combination of the first change rate and the second change rate; According to the load type, the target startup power of the heat pump unit is determined.

5. The heat pump unit startup control method according to claim 1, characterized in that: Also includes: In the case where immediate startup is not required, determining that the heat pump unit is delayed in starting; Determine a delay time according to the first change rate and the second change rate, and continue to periodically update the first change rate and the second change rate during the delay time; At the end of the delay time, determining whether the heat pump unit needs to be started immediately or continue to be delayed based on the most recently updated first change rate and the most recently updated second change rate; In the case of continuing to delay the start, the delay time is updated according to the most recently updated first change rate and the most recently updated second change rate, and the delay start is continued.

6. The heat pump unit startup control method according to claim 5, characterized in that: The step of determining the delay time according to the first change rate and the second change rate includes: determining a difference between a temperature change rate threshold and the first change rate; Determining the product of the second change rate and a preset adjustment coefficient; A quotient between the difference and the product is determined to obtain a delay time.

7. The heat pump unit startup control method according to claim 6, characterized in that: Also includes: During the delayed start-up process, when it is detected that the ambient temperature is lower than the minimum temperature threshold, the water temperature is lower than the minimum water temperature threshold, or the first change rate is greater than the temperature change rate threshold, the heat pump unit is controlled to start with a preset start-up power to readjust the ambient temperature of the target area to the target ambient temperature.

8. A heat pump unit startup control device, characterized in that: Applicable to a heat pump unit, the heat pump unit is used to adjust the ambient temperature of a target area, the device comprises: A change rate updating module, for, when the heat pump unit adjusts the ambient temperature of the target area to the target ambient temperature, entering a constant temperature shutdown state, and periodically updating a first change rate of the ambient temperature of the target area and a second change rate of the water temperature of the heat pump unit; A start-up judgment module, used for determining whether the heat pump unit needs to be started immediately at the end of each cycle according to the updated first change rate and second change rate; A power determination module, configured to determine a target startup power of the heat pump unit according to the first change rate and the second change rate when immediate startup is required; The unit starting module is used to control the heat pump unit to start at the target starting power to readjust the ambient temperature of the target area to the target ambient temperature.

9. A heat pump unit startup control device, characterized in that: The heat pump unit startup control device includes a processor and a memory; The memory is used to store a computer program and transmit the computer program to the processor; The processor is used to execute a heat pump unit startup control method according to any one of claims 1 to 7 according to instructions in the computer program.

10. A storage medium storing computer executable instructions, characterized in that: The computer executable instructions are used to execute a heat pump unit startup control method as described in any one of claims 1 to 7 when executed by a computer processor.

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