A fluorine pump compression refrigeration system and control method, device and medium

Abstract

The application discloses a fluorine pump compression refrigeration system and a control method, device and medium, relates to the technical field of refrigeration and air conditioning, and is used for controlling the working mode switching of the fluorine pump compression refrigeration system. In view of the problem that the fixed switching temperature based on the traditional scheme cannot adapt to actual load changes, a fluorine pump compression refrigeration system control method is provided. The estimated refrigerating capacity of the fluorine pump compression refrigeration system under the current load is estimated through real-time outdoor temperature and operating parameters, and the switching temperature is dynamically obtained. The working mode switching control realized by the switching temperature can make the system enter the fluorine pump mode operation in advance under the low load condition, improve the energy efficiency of the system, make the system enter the compressor mode operation in advance under the high load condition, and guarantee the refrigeration effect of the system, so that a more optimal fluorine pump compression refrigeration system working mode switching control logic is brought, and problems, such as frequent working mode switching and increased temperature fluctuation in the mode switching process, caused by load fluctuation can be effectively avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of refrigeration and air conditioning, and in particular to a fluorine pump compression refrigeration system and a control method, device and medium. BACKGROUND

[0002] The fluorine pump compression refrigeration system is one of the commonly used natural cooling systems, which is composed of a fluorine pump and a compression refrigeration system. The fluorine pump compression refrigeration system has two operating modes of fluorine pump natural cooling and compressor refrigeration, and can adopt different refrigeration modes according to the actual refrigeration scene, so as to meet the needs of refrigeration and energy saving.

[0003] In the related art, the fluorine pump compression refrigeration system is controlled to switch modes according to the outdoor temperature. A switching temperature is set in advance, and when the outdoor temperature exceeds the switching temperature, the compressor mode is started, and when the outdoor temperature is lower than the switching temperature, the fluorine pump mode is started, so as to realize the switching control of the working mode of the fluorine pump compression refrigeration system.

[0004] However, in the process of realizing the present application, the inventors found that the prior art at least has the following problems: this mode of determining the working mode based on the fixed switching temperature may cause frequent switching of the working mode in the case of large changes in outdoor temperature, and the fixed switching temperature is also difficult to adapt to the changing refrigeration demand in actual application. Therefore, in the actual working process of the fluorine pump compression refrigeration system, both the energy consumption is increased and the refrigeration effect cannot be guaranteed.

[0005] Therefore, the technical personnel in the field urgently need a fluorine pump compression refrigeration system control method to solve the problems that the traditional control scheme cannot adapt to the changing refrigeration demand in actual application and may cause frequent switching of the working mode. SUMMARY

[0006] The purpose of the present application is to provide a fluorine pump compression refrigeration system and a control method, device and medium, so as to predict the load condition of the fluorine pump compression refrigeration system according to the real-time outdoor temperature and the operating data of the fluorine pump compression refrigeration system, and dynamically adjust the switching temperature according to the load, so as to bring a more effective working mode switching control scheme.

[0007] To solve the above technical problems, the present application provides a fluorine pump compression refrigeration system control method, comprising:

[0008] determining an estimated refrigeration capacity according to the outdoor temperature and the operating parameters of the fluorine pump compression refrigeration system; wherein the operating parameters include the condenser outlet pressure, the condenser inlet pressure and the outdoor fan speed; and / or the operating parameters include the evaporator outlet pressure, the evaporator inlet pressure and the indoor fan speed;

[0009] determining a real-time switching temperature according to the estimated refrigerating capacity, a default switching temperature, and a refrigerating capacity of the fluorine pump compression refrigerating system when the set temperature is the default switching temperature;

[0010] controlling the switching of the working mode of the fluorine pump compression refrigerating system by the real-time switching temperature.

[0011] In a possible embodiment, the operating parameters include a condenser outlet pressure, a condenser inlet pressure, and an outdoor fan rotating speed;

[0012] The determining of the estimated refrigerating capacity according to the outdoor temperature and the operating parameters of the fluorine pump compression refrigerating system includes:

[0013] determining the estimated refrigerating capacity by a pre-established condenser refrigerating capacity prediction model with the outdoor temperature, the condenser outlet pressure, the condenser inlet pressure, and the outdoor fan rotating speed as inputs;

[0014] The condenser refrigerating capacity prediction model is obtained by training a deep learning model with historical data of the fluorine pump compression refrigerating system. The historical data includes multiple groups of data with the outdoor temperature, the condenser outlet pressure, the condenser inlet pressure, and the outdoor fan rotating speed as inputs, and the actual refrigerating capacity of the fluorine pump compression refrigerating system as outputs.

[0015] In a possible embodiment, the operating parameters include an evaporator outlet pressure, an evaporator inlet pressure, and an indoor fan rotating speed;

[0016] The determining of the estimated refrigerating capacity according to the outdoor temperature and the operating parameters of the fluorine pump compression refrigerating system includes:

[0017] determining the estimated refrigerating capacity by a pre-established evaporator refrigerating capacity prediction model with the outdoor temperature, the evaporator outlet pressure, the evaporator inlet pressure, and the indoor fan rotating speed as inputs;

[0018] The evaporator refrigerating capacity prediction model is obtained by training a deep learning model with historical data of the fluorine pump compression refrigerating system. The historical data includes multiple groups of data with the outdoor temperature, the evaporator outlet pressure, the evaporator inlet pressure, and the indoor fan rotating speed as inputs, and the actual refrigerating capacity of the fluorine pump compression refrigerating system as outputs.

[0019] The determining of the real-time switching temperature according to the estimated refrigerating capacity, the default switching temperature, and the refrigerating capacity of the fluorine pump compression refrigerating system when the set temperature is the default switching temperature includes:

[0020] determining an intermediate result value according to a ratio of a refrigerating capacity of the fluorine pump compression refrigeration system at a set temperature being the default switching temperature to the estimated refrigerating capacity;

[0021] determining the real-time switching temperature according to a product of the intermediate result value and the default switching temperature.

[0022] In a possible embodiment, the controlling the working mode switching of the fluorine pump compression refrigeration system by the real-time switching temperature comprises:

[0023] acquiring the outdoor temperature at the current time whenever the real-time switching temperature is newly obtained;

[0024] if the outdoor temperature exceeds the real-time switching temperature, entering the compressor mode;

[0025] if the outdoor temperature does not exceed the real-time switching temperature, entering the fluorine pump mode;

[0026] when the fluorine pump compression refrigeration system enters the compressor mode, periodically acquiring the real-time outdoor temperature, and if the outdoor temperature is less than a difference between the real-time switching temperature and a first hysteresis, switching the fluorine pump compression refrigeration system to enter the fluorine pump mode;

[0027] when the fluorine pump compression refrigeration system enters the fluorine pump mode, periodically acquiring the real-time outdoor temperature, and if the outdoor temperature is greater than a sum of the real-time switching temperature and a second hysteresis, switching the fluorine pump compression refrigeration system to enter the compressor mode.

[0028] In a possible embodiment, the compressor in the fluorine pump compression refrigeration system is a variable frequency compressor; and after the fluorine pump compression refrigeration system enters the compressor mode, the method further comprises:

[0029] periodically acquiring real-time indoor load information;

[0030] controlling the operating frequency and start-stop state of the variable frequency compressor according to the indoor load information.

[0031] In a possible embodiment, the indoor load information is a difference between an indoor actual temperature and an indoor set temperature;

[0032] and the controlling the operating frequency and start-stop state of the variable frequency compressor according to the indoor load information comprises:

[0033] if the indoor actual temperature is greater than the indoor set temperature, the variable frequency compressor is in an open state, and the operating frequency of the variable frequency compressor is positively correlated with the difference between the indoor actual temperature and the indoor set temperature;

[0034] If the actual indoor temperature is less than or equal to the indoor set temperature, the variable frequency compressor is in an off state.

[0035] To solve the above technical problems, the application further provides a fluorine pump compression refrigeration system, comprising a controller, an evaporating coil, a compressor, a condensing coil, a fluorine pump, a throttling device, a first one-way valve and a second one-way valve.

[0036] The controller is configured to implement the steps of the fluorine pump compression refrigeration system control method.

[0037] To solve the above technical problems, the application further provides a fluorine pump compression refrigeration system control device, comprising:

[0038] A prediction module is configured to determine an estimated refrigeration capacity according to an outdoor temperature and operating parameters of the fluorine pump compression refrigeration system, wherein the operating parameters comprise a condenser outlet pressure, a condenser inlet pressure and an outdoor fan rotating speed; and / or the operating parameters comprise an evaporator outlet pressure, an evaporator inlet pressure and an indoor fan rotating speed.

[0039] A determination module is configured to determine a real-time switching temperature according to the estimated refrigeration capacity, a default switching temperature and a refrigeration capacity of the fluorine pump compression refrigeration system at the default switching temperature.

[0040] An application module is configured to control a working mode switching of the fluorine pump compression refrigeration system by using the real-time switching temperature.

[0041] To solve the above technical problems, the application further provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program is executed by a processor to implement the steps of the fluorine pump compression refrigeration system control method.

[0042] The fluorine pump compression refrigeration system control method provided by the application has at least the following beneficial effects:

[0043] The method estimates the estimated refrigerating capacity of the fluorine pump compression refrigeration system under the current load condition through the real-time outdoor temperature and the operating parameters of the fluorine pump compression refrigeration system. In addition, the current default switching temperature is generally based on the temperature that can be met by the full load operating refrigerating capacity of the fluorine pump compression refrigeration system under laboratory conditions and working in the fluorine pump mode. Therefore, the embodiment takes the default switching temperature and the load condition reflected by the corresponding refrigerating capacity of the default switching temperature as the benchmark, adjusts the switching temperature based on the relationship between the actual obtained load and the load corresponding to the default switching temperature, dynamically obtains the switching temperature suitable for the actual load condition, and controls the working mode switching of the fluorine pump compression refrigeration system based on the real-time switching temperature dynamically adjusted. In the low load condition, the system can enter the fluorine pump mode operation in advance, improving the energy efficiency of the system; in the high load condition, the system can enter the compressor mode operation in advance, ensuring the refrigerating effect of the system; thereby bringing a more optimal fluorine pump compression refrigeration system working mode switching control logic, and effectively avoiding the problems of frequent working mode switching and increased temperature fluctuation in the mode switching process caused by load fluctuation.

[0044] The fluorine pump compression refrigeration system, the fluorine pump compression refrigeration control device, and the computer readable storage medium provided by the application correspond to the above method and have the same effect. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0046] Figure 1 A flowchart of a fluorine pump compression refrigeration system control method provided by the application;

[0047] Figure 2 A flowchart of another fluorine pump compression refrigeration system control method provided by the application;

[0048] Figure 3 A structure diagram of a fluorine pump compression refrigeration system provided by the application;

[0049] Among them, 1 is an evaporating coil, 2 is a compressor, 3 is a condensing coil, 4 is a fluorine pump, 5 is a throttling device, 6 is a second one-way valve, and 7 is a first one-way valve. DETAILED DESCRIPTION

[0050] With reference to the accompanying drawings: clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0051] The core of the present application is to provide a fluorine pump compression refrigeration system and a control method, device and medium.

[0052] In order to enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0053] At present, the fluorine pump compression refrigeration system has two working modes of fluorine pump natural cooling and compressor refrigeration (hereinafter referred to as fluorine pump mode and compressor mode). The fluorine pump mode has good energy saving effect, and the compressor mode has good refrigeration effect. The fluorine pump compression refrigeration system can switch between the two working modes to cope with different load conditions.

[0054] In related technologies, the working mode switching control logic of the fluorine pump compression refrigeration system is realized by the outdoor temperature: by pre-setting a switching temperature, when the outdoor temperature exceeds the switching temperature, the compressor mode is started, and when the outdoor temperature is lower than the switching temperature, the fluorine pump mode is started. The control logic of this fixed switching temperature may cause frequent switching of the working mode in the case of large change of the outdoor temperature. And the fixed switching temperature is also difficult to adapt to the changing refrigeration demand in actual application, so that both the energy consumption and the refrigeration effect cannot be guaranteed in the actual working process of the fluorine pump compression refrigeration system.

[0055] To solve the above problems, the present application provides a fluorine pump compression refrigeration system control method, as shown in Figure 1 The method comprises the following steps:

[0056] S11: determining the estimated refrigeration capacity according to the outdoor temperature and the operating parameters of the fluorine pump compression refrigeration system.

[0057] The operating parameters include the condenser outlet pressure, the condenser inlet pressure and the outdoor fan speed. And / or, the operating parameters include the evaporator outlet pressure, the evaporator inlet pressure and the indoor fan speed.

[0058] S12: determining the real-time switching temperature according to the estimated refrigeration capacity, the default switching temperature and the refrigeration capacity of the fluorine pump compression refrigeration system at the default switching temperature.

[0059] S13: controlling the working mode switching of the fluorine pump compression refrigeration system by the real-time switching temperature.

[0060] For step S11, the operation parameters for determining the estimated refrigerating capacity of the fluorine pump compression refrigeration system proposed in the method are two groups, which correspond to two important devices for realizing refrigeration in the fluorine pump compression refrigeration system, namely, the condenser and the evaporator. The condenser is a key component for releasing heat in the fluorine pump compression refrigeration system. Due to the heat balance principle of the fluorine pump compression refrigeration system, the heat release amount of the condenser can indirectly reflect the refrigerating capacity of the fluorine pump compression refrigeration system. The evaporator is a key component for absorbing heat in the fluorine pump compression refrigeration system, and the heat absorbed by the evaporator is the refrigerating capacity of the fluorine pump compression refrigeration system. Therefore, based on any of the above two kinds of operation parameters, the refrigerating capacity of the fluorine pump compression refrigeration system can be estimated from any side of the condenser and the evaporator.

[0061] At the same time, the two groups of operation parameters also correspond to the parts of the components of the fluorine pump compression refrigeration system arranged indoors and outdoors. However, it should be noted that the above two groups of operation parameters are only two possible implementation schemes for determining the refrigerating capacity of the fluorine pump compression refrigeration system, and the fluorine pump compression refrigeration system also includes other components and other parameters that can directly or indirectly reflect the refrigerating capacity of the fluorine pump compression refrigeration system. The above two possible operation parameters are only the operation parameters that can be collected based on the indoor and outdoor scenarios in the present embodiment. In addition, the above two groups of operation parameters can also be used together as operation parameters for determining the estimated refrigerating capacity, which is not limited in the present embodiment.

[0062] Further, for the above two groups of operation parameters and the outdoor temperature T out How to determine the estimated refrigerating capacity, the present embodiment also provides a possible implementation scheme:

[0063] 1. The operation parameters include: condenser outlet pressure P1, condenser inlet pressure P2, and outdoor fan speed a.

[0064] Then, as shown in Figure 2 , the above step S11 is specifically:

[0065] S11-A: Taking the outdoor temperature, the condenser outlet pressure, the condenser inlet pressure, and the outdoor fan speed as inputs, the estimated refrigerating capacity is determined by a pre-established condenser refrigerating capacity prediction model.

[0066] The condenser refrigerating capacity prediction model is obtained by training a deep learning model based on historical data of the fluorine pump compression refrigeration system. The historical data includes multiple groups of data in which the outdoor temperature, the condenser outlet pressure, the condenser inlet pressure, and the outdoor fan speed are taken as inputs, and the actual refrigerating capacity of the fluorine pump compression refrigeration system is taken as output.

[0067] 2. The operation parameters include: evaporator outlet pressure P3, evaporator inlet pressure P4, and indoor fan speed b.

[0068] Then as Figure 2 shown in the above step S11 is specifically:

[0069] S11-B: taking outdoor temperature, evaporator outlet pressure, evaporator inlet pressure and indoor fan speed as input, determining the estimated refrigeration capacity through the pre-established evaporator refrigeration capacity prediction model.

[0070] Wherein, the evaporator refrigeration capacity prediction model is obtained by training a deep learning model through historical data of the fluorine pump compression refrigeration system; the historical data includes multiple groups of data groups taking outdoor temperature, evaporator outlet pressure, evaporator inlet pressure and indoor fan speed as input, and taking the actual refrigeration capacity of the corresponding fluorine pump compression refrigeration system as output.

[0071] As can be seen from the above, the embodiment is to pre-establish and train the calculation model corresponding to the condenser and evaporator in the fluorine pump compression refrigeration system through a deep learning algorithm, so that the actually collected outdoor temperature T out and running data (P1, P2, a, or P3, P4, b) are taken as input of the corresponding calculation model, and the calculation model will output the estimated refrigeration capacity as the result. The refrigeration capacity estimation based on the deep learning model provided in the embodiment has high prediction accuracy, and based on the continuous operation in the application process of the fluorine pump compression refrigeration system, the running data can be collected to further train the calculation model, and the prediction accuracy can be continuously improved.

[0072] It should be further pointed out that the above two refrigeration capacity estimation schemes can be implemented separately or together, and together can bring higher prediction accuracy. But because two calculation models need to be deployed or a "big" calculation model ( "big" is relative to the model complexity of the previous two calculation models) taking two groups of running parameters and outdoor temperature T out as input, so the implementation subject (such as the controller in the fluorine pump compression refrigeration system) implementing the method has higher requirements on computing performance. Therefore, whether to estimate the refrigeration capacity based on one group of running parameters or two groups of running parameters can be comprehensively judged according to the actual situation, and the embodiment does not limit this.

[0073] Next, step S12, based on the estimated cooling capacity determined in step S11, the predetermined default switching temperature, and the corresponding cooling capacity of the refrigerant pump compression refrigeration system at the default switching temperature, determines the real-time switching temperature adjusted according to the actual load. As mentioned earlier, to ensure cooling performance, there is generally a positive correlation between the cooling capacity of the refrigerant pump compression refrigeration system and the load; that is, the greater the load on the refrigerant pump compression refrigeration system, the more cooling capacity it needs to output. Therefore, based on the default switching temperature and the corresponding cooling capacity, a benchmark can be determined for the relationship between the switching temperature and the cooling capacity. Then, based on this benchmark, another temperature value can be determined from the estimated cooling capacity determined in step S11. This temperature value, corresponding to the estimated cooling capacity switching temperature, is the switching temperature adapted to the current system load.

[0074] Furthermore, this embodiment also provides a possible implementation scheme for the specific implementation of the above step S12, which specifically includes:

[0075] S121: Determine the intermediate result value based on the ratio of the cooling capacity of the fluorine pump compression refrigeration system at the set temperature (default switching temperature) to the estimated cooling capacity.

[0076] S122: Determine the real-time switching temperature based on the product of the intermediate result value and the default switching temperature.

[0077] The steps provided in this embodiment can be simply represented by the following formula (1):

[0078] T1 = Q1 / Q0 * T0;

[0079] Where T1 represents the real-time switching temperature; Q1 represents the estimated cooling capacity; T0 represents the default switching temperature; and Q0 represents the cooling capacity of the refrigerant pump compression refrigeration system at the default switching temperature. It should be noted that both Q0 and T0 are pre-calibrated values ​​obtained through laboratory testing before the refrigerant pump compression refrigeration system is put into formal use. The default switching temperature Q0 is the standard default switching temperature used when the refrigerant pump compression refrigeration system switches control modes before the first real-time switching temperature T1 is determined by this method. Or, as... Figure 2 As shown, after the refrigerant pump compression refrigeration system is turned on, it first determines the outdoor temperature T. out If the temperature exceeds the refrigerant pump's operating temperature, then run in compressor mode first, and then execute steps S11~S13 as described above.

[0080] It should be noted that the above formula and the real-time switching temperature determination scheme provided in the embodiment are only basic implementation schemes. In actual applications, other improvements can be made on the basis of the embodiment according to different needs. For example, a correction coefficient k can be introduced. At this time, the above formula (1) becomes formula (2) as follows:

[0081] T1=Q1 / Q0*T0*k;

[0082] The correction coefficient k corresponds to the actual working environment of the fluorine pump compression refrigeration system. Considering the specificity of different working environments, the correction coefficient k generally needs to be determined in advance based on tests and calculations. The correction coefficient k is a coefficient for calibrating and correcting the real-time switching temperature based on the above formula (1) and the specificity of the actual working environment of the fluorine pump compression refrigeration system, so that the real-time switching temperature calculated in the working environment is more accurate.

[0083] Finally, it corresponds to step S13. Step S13 is a step of performing working mode switching control of the fluorine pump compression refrigeration system based on the real-time switching temperature obtained in step S12. In the above embodiment, a common control scheme has been described, that is, as described in the related art, it is determined whether the fluorine pump compression refrigeration system is running in the fluorine pump mode or the compressor mode based on the size relationship between the real-time outdoor temperature and the switching temperature. If the real-time outdoor temperature < switching temperature, it works in the fluorine pump mode, and if the outdoor temperature > switching temperature, it works in the compressor mode. The difference is that the switching temperature in the related art is fixed, that is, the default switching temperature T0 described above. The switching temperature in the embodiment is the real-time switching temperature T1 which is dynamically adjusted according to the real-time load condition.

[0084] However, further, the embodiment also provides another working mode switching control scheme of the fluorine pump compression refrigeration system, as shown in Figure 2 The above step S13 specifically includes:

[0085] S131: Obtain the outdoor temperature at the current time whenever a real-time switching temperature is obtained.

[0086] S132: If the outdoor temperature exceeds the real-time switching temperature, enter the compressor mode.

[0087] S133: If the outdoor temperature does not exceed the real-time switching temperature, enter the fluorine pump mode.

[0088] S134: When the fluorine pump compression refrigeration system enters the compressor mode, periodically obtain the real-time outdoor temperature, and if the outdoor temperature is less than the difference between the real-time switching temperature and the first hysteresis, switch the fluorine pump compression refrigeration system to enter the fluorine pump mode.

[0089] S135: When the fluorine pump compression refrigeration system enters the fluorine pump mode, periodically acquire the real-time outdoor temperature, if the outdoor temperature is greater than the sum of the real-time switching temperature and the second hysteresis, switch the fluorine pump compression refrigeration system into the compressor mode.

[0090] From the above, in this embodiment, the time when the real-time switching temperature T1 is acquired each time to the time when the real-time switching temperature T1 is acquired next time (not including this time) is regarded as a control period. Corresponding to steps S131-S133, the first mode switching control of each control period is determined based on the current outdoor temperature T out and the size relationship between the real-time switching temperature T1. If T out > T1, work in the compressor mode, if T out ≤ T1, work in the fluorine pump mode. But after determining the working mode for the first time in this control period, corresponding to steps S134 and S135, the switching of the current working mode to another working mode needs to additionally meet the setting of the hysteresis. Specifically, switching from the compressor mode to the fluorine pump mode needs to meet T out ≤ T1- T a (T a , that is, the first hysteresis described above), otherwise, even if T out ≤ T1, the current compressor mode is maintained. Similarly, switching from the fluorine pump mode to the compressor mode needs to meet T out > T1+ T b (T b , that is, the second hysteresis described above), otherwise, even if T out > T1, the current fluorine pump mode is maintained.

[0091] It should be noted that the values of the first hysteresis T a and the second hysteresis T b are not limited in this embodiment, and can be freely selected according to actual needs. And the values of the first hysteresis T a and the second hysteresis T b may be equal or not equal, and the first hysteresis T a and the second hysteresis T b may take the same value. For example, in a possible implementation, the first hysteresis T a and the second hysteresis T b are both 2℃.

[0092] The embodiment introduces the setting of the back difference to avoid the frequent switching of the working mode of the fluorine pump compression refrigeration system. Especially, if the outdoor temperature fluctuates around the real-time switching temperature in a control period, the scheme provided by the embodiment can effectively avoid the influence of the small fluctuation on the switching control of the working mode of the fluorine pump compression refrigeration system. On the one hand, the scheme can avoid the problem that the poor refrigeration effect and the energy consumption are aggravated due to the frequent switching of the working mode of the fluorine pump compression refrigeration system, and on the other hand, the scheme can also avoid the problem that the service life is shortened due to the frequent start and stop of the compressor and the fluorine pump.

[0093] On the other hand, in addition to the switching control scheme of the working mode of the fluorine pump compression refrigeration system provided by the above embodiment, the embodiment also provides another control scheme. When the compressor in the fluorine pump compression refrigeration system is a variable frequency compressor, after the fluorine pump compression refrigeration system enters the compressor mode, the method further includes:

[0094] S21: periodically acquiring real-time indoor load information.

[0095] S22: controlling the running frequency and start-stop state of the variable frequency compressor according to the indoor load information.

[0096] For the above step S21, the embodiment does not limit the cycle length of acquiring the indoor load information, and the acquisition cycle can be determined according to the actual control cycle of the variable frequency compressor. In addition, the indoor load information can be any information that can reflect the indoor load condition of the fluorine pump compression refrigeration system. For example, in a possible implementation, the indoor load information can be the difference between the actual indoor temperature T2 and the indoor set temperature T3. It should be noted that the difference between the indoor temperature and the set temperature has a "direction", that is, it needs to be the difference between the indoor temperature T2 and the set temperature T3, and the size and the sign of the difference T2-T3 are more related to the difference. The closer the difference is to positive infinity, the larger the difference is, that is, the larger the indoor load is.

[0097] For the above embodiment in which the indoor load information is the difference T2-T3 between the actual indoor temperature and the indoor set temperature, the embodiment also provides a specific implementation of step S22, and the above step S22 specifically includes:

[0098] S221: if the actual indoor temperature is greater than the indoor set temperature, the variable frequency compressor is in an open state, and the running frequency of the variable frequency compressor is positively correlated with the difference between the actual indoor temperature and the indoor set temperature.

[0099] S222: if the actual indoor temperature is less than or equal to the indoor set temperature, the variable frequency compressor is in a closed state.

[0100] The embodiment is a control scheme provided for the working control of the variable frequency compressor in the fluorine pump compression refrigeration system. The difference between the actual temperature and the set temperature in the room is taken as the parameter reflecting the size of the indoor load. When the indoor temperature T2 is less than or equal to the set temperature T3, there is no refrigeration demand in the room, at which time the compressor is turned off. When the indoor temperature T2 is greater than the set temperature T3, there is refrigeration demand in the room, at which time the compressor is turned on. The operating frequency of the compressor is positively correlated with the load size T2-T3. The greater the load size T2-T3, the higher the operating frequency of the compressor, and the fluorine pump compression refrigeration system can output more refrigeration capacity per unit time. Conversely, the lower the operating frequency of the compressor, the less the refrigeration capacity output by the fluorine pump compression refrigeration system per unit time, but it is more energy-saving. Based on the control scheme provided in the embodiment, the variable frequency control of the compressor based on the indoor load is realized, so that the refrigeration capacity of the fluorine pump compression refrigeration system can better meet the actual needs, and energy consumption can be saved under the premise of ensuring the refrigeration effect, so that the comprehensive performance of the fluorine pump compression refrigeration system is better.

[0101] On the other hand, the above-mentioned embodiment provides a corresponding control method for the working mode switching control of the fluorine pump compression refrigeration system, but does not make any limitation on the fluorine pump compression refrigeration system itself, and can be applied to various fluorine pump compression refrigeration systems existing at present. However, the embodiment provides a corresponding embodiment of the fluorine pump compression refrigeration system, as shown in Figure 3 , which comprises: a controller (not shown in the figure), an evaporating coil 1, a compressor 2, a condensing coil 3, a fluorine pump 4, a throttling device 5, a first one-way valve 7 and a second one-way valve 6. Figure 3

[0102] Among them, the controller is used to realize the steps of the fluorine pump compression refrigeration system control method provided by the above-mentioned embodiment, that is, at least to realize steps S11-S13. The controller can be a built-in controller in the fluorine pump compression refrigeration system, or other controller specially used for issuing the working mode switching of the fluorine pump compression refrigeration system. The controller can be a single-chip microcomputer, a digital signal processor (Digital Signal Processor, DSP) and other devices or apparatuses with control function, and the embodiment does not make any limitation on this.

[0103] In addition, the principle of the fluorine pump compression refrigeration system provided in the embodiment running in different working modes is as follows:

[0104] 1. Running in the compressor mode: the fluorine pump 4 is closed, the compressor 2 is turned on, the first one-way valve 7 is closed, and the second one-way valve 6 is turned on. At this time, the compressor 2, the condensing coil 3, the throttling device 5 and the evaporating coil 1 form a refrigeration circuit.

[0105] ​2. Run in the fluorine pump mode: the fluorine pump 4 is turned on, the compressor 2 is turned off, the first one-way valve 7 is turned on, and the second one-way valve 6 is turned off. At this time, the condenser coil 3, the fluorine pump 4, the throttling device 5, and the evaporator coil 1 form a refrigeration circuit.

[0106] As for other embodiments, since the embodiments of the system part correspond to the embodiments of the method part, please refer to the description of the embodiments of the method part for the embodiments of the system part, which will not be described here.

[0107] In the above embodiments, the fluorine pump compression refrigeration system and the control method thereof are described in detail, and the present application also provides a corresponding embodiment of a fluorine pump compression refrigeration system control device. It should be noted that the embodiments of the device part are described from two angles, one is based on the functional module, and the other is based on the hardware.

[0108] Based on the functional module, the present embodiment provides a fluorine pump compression refrigeration system control device, comprising:

[0109] The prediction module is configured to determine an estimated refrigeration capacity according to the outdoor temperature and the operating parameters of the fluorine pump compression refrigeration system; wherein the operating parameters include the condenser outlet pressure, the condenser inlet pressure, and the outdoor fan speed; and / or, the operating parameters include the evaporator outlet pressure, the evaporator inlet pressure, and the indoor fan speed.

[0110] The determination module is configured to determine a real-time switching temperature according to the estimated refrigeration capacity, the default switching temperature, and the refrigeration capacity of the fluorine pump compression refrigeration system at the default switching temperature.

[0111] The application module is configured to control the working mode switching of the fluorine pump compression refrigeration system through the real-time switching temperature.

[0112] Since the embodiments of the device part also correspond to the embodiments of the method part, the embodiments of the device part also refer to the description of the embodiments of the method part, which will not be described here.

[0113] Finally, the present application also provides a corresponding embodiment of a computer readable storage medium. The computer readable storage medium stores a computer program, and the computer program is executed by a processor to realize the steps recorded in the above method embodiments.

[0114] It can be understood that if the method in the above embodiment is implemented in the form of a software function unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the part of the prior art that contributes to the technical solutions or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and performs all or part of the steps of the method described in each embodiment of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0115] The above provides a fluorine pump compression refrigeration system and control method, device and medium. The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts of each embodiment can be referred to. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the related parts can be referred to the method part. It should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, the present application can be improved and modified, and these improvements and modifications also fall within the protection scope of the present application.

[0116] It should be further noted that in the specification, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of other identical elements in the process, method, article or equipment including the element.

Claims

1. A control method for a fluoro-compressor refrigeration system, characterized in that, Comprise: Determine the estimated cooling capacity according to the outdoor temperature and the operating parameters of the fluorine pump compression refrigeration system; wherein, the operating parameters include: condenser outlet pressure, condenser inlet pressure and outdoor fan speed; and / or, the operating parameters include: evaporator outlet pressure, evaporator inlet pressure and indoor fan speed; Determine the intermediate result value according to the ratio of the cooling capacity of the fluorine pump compression refrigeration system at the set temperature being the default switching temperature to the estimated cooling capacity; Determine the real-time switching temperature according to the product of the intermediate result value and the default switching temperature; Control the working mode switching of the fluorine pump compression refrigeration system through the real-time switching temperature.

2. The fluoro-pump compression refrigeration system control method of claim 1, wherein, The operating parameters include: condenser outlet pressure, condenser inlet pressure and outdoor fan speed; Then, the determination of the estimated cooling capacity according to the outdoor temperature and the operating parameters of the fluorine pump compression refrigeration system comprises: Determine the estimated cooling capacity through the pre-established condenser cooling capacity prediction model with the outdoor temperature, the condenser outlet pressure, the condenser inlet pressure and the outdoor fan speed as inputs; Wherein, the condenser cooling capacity prediction model is obtained by training a deep learning model with historical data of the fluorine pump compression refrigeration system; the historical data includes multiple groups of data with the outdoor temperature, the condenser outlet pressure, the condenser inlet pressure and the outdoor fan speed as inputs, and the actual cooling capacity of the fluorine pump compression refrigeration system as outputs.

3. The control method of claim 1, wherein The operating parameters include: evaporator outlet pressure, evaporator inlet pressure and indoor fan speed; Then, the determination of the estimated cooling capacity according to the outdoor temperature and the operating parameters of the fluorine pump compression refrigeration system comprises: Determine the estimated cooling capacity through the pre-established evaporator cooling capacity prediction model with the outdoor temperature, the evaporator outlet pressure, the evaporator inlet pressure and the indoor fan speed as inputs; Wherein, the evaporator cooling capacity prediction model is obtained by training a deep learning model with historical data of the fluorine pump compression refrigeration system; the historical data includes multiple groups of data with the outdoor temperature, the evaporator outlet pressure, the evaporator inlet pressure and the indoor fan speed as inputs, and the actual cooling capacity of the fluorine pump compression refrigeration system as outputs.

4. The control method of claim 1 wherein, The control of the working mode switching of the fluorine pump compression refrigeration system through the real-time switching temperature comprises: Whenever the real-time switching temperature is newly obtained, the outdoor temperature at the current time is obtained; If the outdoor temperature exceeds the real-time switching temperature, enter the compressor mode; If the outdoor temperature does not exceed the real-time switching temperature, enter the fluorine pump mode; When the fluorine pump compression refrigeration system enters the compressor mode, periodically obtain the real-time outdoor temperature, and if the outdoor temperature is less than the difference between the real-time switching temperature and the first hysteresis, switch the fluorine pump compression refrigeration system to enter the fluorine pump mode; When the fluorine pump compression refrigeration system enters the fluorine pump mode, periodically acquire real-time outdoor temperature, if the outdoor temperature is greater than the sum of the real-time switching temperature and the second return difference, switch the fluorine pump compression refrigeration system into the compressor mode.

5. The control method of a fluorine pump refrigeration system according to any one of claims 1 to 4, characterized by, The compressor in the fluorine pump compression refrigeration system is a variable frequency compressor; then after the fluorine pump compression refrigeration system enters the compressor mode, the method further comprises: Periodically acquire real-time indoor load information; According to the indoor load information, control the operating frequency and start-stop state of the variable frequency compressor.

6. The control method of claim 5 wherein, The indoor load information is the difference between the indoor actual temperature and the indoor set temperature; And the control of the operating frequency and start-stop state of the variable frequency compressor according to the indoor load information comprises: If the indoor actual temperature is greater than the indoor set temperature, the variable frequency compressor is in an open state, and the operating frequency of the variable frequency compressor is positively correlated with the difference between the indoor actual temperature and the indoor set temperature; If the indoor actual temperature is less than or equal to the indoor set temperature, the variable frequency compressor is in a closed state.

7. A fluorine pump compression refrigeration system characterized by, Comprise: A controller, an evaporating coil, a compressor, a condensing coil, a fluorine pump, a throttling device, a first one-way valve and a second one-way valve; The controller is used to realize the steps of the fluorine pump compression refrigeration system control method according to any one of claims 1 to 6.

8. A control apparatus for a fluorine pump compression refrigeration system, characterized by comprising: Comprise: A prediction module for determining an estimated refrigeration capacity according to the outdoor temperature and the operating parameters of the fluorine pump compression refrigeration system; wherein the operating parameters include the condenser outlet pressure, the condenser inlet pressure and the outdoor fan speed; and / or, the operating parameters include the evaporator outlet pressure, the evaporator inlet pressure and the indoor fan speed; A determination module for determining an intermediate result value according to the ratio of the refrigeration capacity of the fluorine pump compression refrigeration system at a set temperature being the default switching temperature to the estimated refrigeration capacity; and determining a real-time switching temperature according to the product of the intermediate result value and the default switching temperature; An application module for controlling the working mode switching of the fluorine pump compression refrigeration system through the real-time switching temperature.

9. A computer-readable storage medium, characterized in that, The computer program stored on the computer readable storage medium is executed by the processor to realize the steps of the fluorine pump compression refrigeration system control method according to any one of claims 1 to 6.

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