Fluorine pump compression refrigeration system, control method, device and medium

Abstract

The invention discloses a fluorine pump compression refrigeration system, a control method and device and a medium, relates to the technical field of refrigeration air conditioners, is used for controlling working mode switching of the fluorine pump compression refrigeration system, and provides the fluorine pump compression refrigeration system control method aiming at the problem that a traditional scheme cannot adapt to actual load changes based on a fixed switching temperature. The estimated refrigerating capacity of the fluorine pump compression refrigerating system under the current load is estimated through the real-time outdoor temperature and the operation parameters, and the switching temperature is dynamically obtained. By means of working mode switching control achieved through temperature switching, the system can enter a fluorine pump mode to operate in advance under the low-load condition, and the energy efficiency of the system is improved; under the high-load condition, the system can enter a compressor mode to operate in advance, and the refrigeration effect of the system is guaranteed; therefore, a better fluorine pump compression refrigeration system working mode switching control logic is provided, and the problems of frequent working mode switching, increased temperature fluctuation in the mode switching process and the like 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 Art

[0002] Fluorine pump compression refrigeration system is one of the commonly used natural cooling systems, which consists of a fluorine pump and a compression refrigeration system. The fluorine pump compression refrigeration system has two operating modes: fluorine pump natural cooling and compressor refrigeration. Different refrigeration modes can be adopted according to the actual refrigeration scenario, thus taking into account both refrigeration and energy saving needs.

[0003] In the related art, the fluorine pump compression refrigeration system realizes mode switching control according to the outdoor temperature. By presetting a switching temperature, when the outdoor temperature exceeds the switching temperature, the compressor mode is turned on, and when the outdoor temperature is lower than the switching temperature, the fluorine pump mode is turned on, thereby realizing the switching control of the working mode of the fluorine pump compression refrigeration system.

[0004] However, in the process of realizing the invention of this application, the inventors found that the prior art has at least the following problems: this method of determining the working mode based on a fixed switching temperature may cause frequent switching of the working mode when the outdoor temperature changes greatly, and the fixed switching temperature is also difficult to adapt to the changing refrigeration needs in actual applications. As a result, in the actual working process of the fluorine pump compression refrigeration system, energy consumption is increased and the refrigeration effect cannot be guaranteed.

[0005] Therefore, technicians in this field are in urgent need of a fluorine pump compression refrigeration system control method to solve the problem that traditional control schemes cannot adapt to the changing refrigeration needs in actual applications and may cause frequent switching of working modes. Summary of the invention

[0006] The purpose of this application is to provide a fluorine pump compression refrigeration system and a control method, device, and medium to predict the load condition of the fluorine pump compression refrigeration system based on 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, thereby providing a more effective working mode switching control scheme.

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

[0008] 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;

[0009] 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 when the set temperature is the default switching temperature;

[0010] The working mode switching of the fluorine pump compression refrigeration system is controlled by the real-time switching temperature.

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

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

[0013] Taking the outdoor temperature, the condenser outlet pressure, the condenser inlet pressure and the outdoor fan speed as input, the estimated cooling capacity is determined by a pre-established condenser cooling capacity prediction model;

[0014] Among them, the condenser cooling capacity prediction model is obtained by training a deep learning model through the historical data of the fluorine pump compression refrigeration system; the historical data includes multiple groups of data groups with the outdoor temperature, the condenser outlet pressure, the condenser inlet pressure and the outdoor fan speed as input, and the actual cooling capacity of the corresponding fluorine pump compression refrigeration system as output.

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

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

[0017] Determine the estimated cooling capacity by using a pre-established evaporator cooling capacity prediction model using the outdoor temperature, the evaporator outlet pressure, the evaporator inlet pressure and the indoor fan speed as inputs;

[0018] Among them, the evaporator cooling capacity prediction model is obtained by training a deep learning model through the historical data of the fluorine pump compression refrigeration system; the historical data includes multiple groups of data groups with the outdoor temperature, the evaporator outlet pressure, the evaporator inlet pressure and the indoor fan speed as input, and the actual cooling capacity of the fluorine pump compression refrigeration system as output.

[0019] In a possible embodiment, 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 when the set temperature is the default switching temperature includes:

[0020] Determining an intermediate result value according to a ratio of the refrigeration capacity of the fluorine pump compression refrigeration system when the set temperature is the default switching temperature to the estimated refrigeration capacity;

[0021] The real-time switching temperature is determined according to the product of the intermediate result value and the default switching temperature.

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

[0023] Whenever the real-time switching temperature is newly obtained, the outdoor temperature at the current moment is obtained;

[0024] If the outdoor temperature exceeds the real-time switching temperature, the compressor mode is entered;

[0025] If the outdoor temperature does not exceed the real-time switching temperature, the fluorine pump mode is entered;

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

[0027] When the fluorine pump compression refrigeration system enters the fluorine pump mode, the real-time outdoor temperature is periodically acquired. If the outdoor temperature is greater than the sum of the real-time switching temperature and the second hysteresis, the fluorine pump compression refrigeration system is switched to enter the compressor mode.

[0028] In a possible embodiment, 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:

[0029] Periodically obtain real-time indoor load information;

[0030] The operating frequency and start / stop state of the variable frequency compressor are controlled according to the indoor load information.

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

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

[0033] If the actual indoor temperature is greater than the set indoor temperature, the variable frequency compressor is turned on, and the operating frequency of the variable frequency compressor is positively correlated with the difference between the actual indoor temperature and the set indoor temperature;

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

[0035] In order to solve the above technical problems, the present application also provides a fluorine pump compression refrigeration system, including: 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] Wherein, the controller is used to implement the steps of the fluorine pump compression refrigeration system control method as described above.

[0037] In order to solve the above technical problems, the present application also provides a fluorine pump compression refrigeration system control device, comprising:

[0038] A prediction module, for determining an estimated cooling capacity according to an outdoor temperature and operating parameters of a fluorine pump compression refrigeration system; wherein the operating parameters include: a condenser outlet pressure, a condenser inlet pressure, and an outdoor fan speed; and / or, the operating parameters include: an evaporator outlet pressure, an evaporator inlet pressure, and an indoor fan speed;

[0039] A determination module, used for determining 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 when the set temperature is the default switching temperature;

[0040] The application module is used to control the working mode switching of the fluorine pump compression refrigeration system through the real-time switching temperature.

[0041] In order to solve the above technical problems, the present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the fluorine pump compression refrigeration system control method as described above are implemented.

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

[0043] This method estimates the estimated refrigeration 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 setting is generally based on the temperature that can be met by the refrigeration capacity of the fluorine pump compression refrigeration system working in the fluorine pump mode under laboratory conditions and at full load. Therefore, this embodiment takes the default switching temperature and the load condition reflected by the refrigeration capacity corresponding to the default switching temperature as the benchmark, and adjusts the switching temperature based on the relationship between the load actually obtained and the load corresponding to the default switching temperature, so as to dynamically obtain the switching temperature adapted to the actual load condition. Based on this dynamically adjusted real-time switching temperature, the fluorine pump compression refrigeration system can be more adapted to the actual system load. Working mode switching control. Under low load conditions, the system can enter the fluorine pump mode in advance to improve system energy efficiency; under high load conditions, the system can enter the compressor mode in advance to ensure the refrigeration effect of the system; thereby bringing a better working mode switching control logic for the fluorine pump compression refrigeration system, and can effectively avoid problems such as frequent switching of working modes and increased temperature fluctuations during mode switching caused by load fluctuations.

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

[0045] In order to more clearly illustrate the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0046] FIG1 is a flow chart of a fluorine pump compression refrigeration system control method provided by the present invention;

[0047] FIG2 is a flow chart of another fluorine pump compression refrigeration system control method provided by the present invention;

[0048] FIG3 is a structural diagram of a fluorine pump compression refrigeration system provided by the present invention;

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

[0050] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0051] The core of this 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 is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0053] At present, the fluorine pump compression refrigeration system has two working modes: 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 the related art, 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 turned on, and when the outdoor temperature is lower than the switching temperature, the fluorine pump mode is turned on. This control logic with a fixed switching temperature may cause frequent switching of the working mode when the outdoor temperature changes greatly. Moreover, the fixed switching temperature is difficult to adapt to the changing refrigeration needs in actual applications, which increases energy consumption and fails to ensure the refrigeration effect during the actual operation of the fluorine pump compression refrigeration system.

[0055] In order to solve the above problems, the present application provides a fluorine pump compression refrigeration system control method, as shown in FIG1 , comprising:

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

[0057] 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.

[0058] S12: Determine the real-time switching temperature according to the estimated cooling capacity, the default switching temperature, and the cooling capacity of the fluorine pump compression refrigeration system when the set temperature is the default switching temperature.

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

[0060] For step S11, there are two groups of operating parameters proposed in this method that can be used to determine the estimated refrigeration capacity of the fluorine pump compression refrigeration system, which correspond to the two important devices for realizing refrigeration in the fluorine pump compression refrigeration system - the condenser and the evaporator. The condenser is a key component for releasing heat in the fluorine pump compression refrigeration system. Due to the thermal balance principle of the fluorine pump compression refrigeration system, the heat released by the condenser can indirectly reflect the refrigeration 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 is also the refrigeration capacity of the fluorine pump compression refrigeration system. Therefore, based on any one of the above two operating parameters, the refrigeration capacity of the fluorine pump compression refrigeration system can be estimated from either side of the condenser and the evaporator.

[0061] At the same time, the two groups of operating parameters also correspond to the indoor part and the outdoor part of the fluorine pump compression refrigeration system components. However, it should be noted that the above two groups of operating parameters are only two possible implementation plans for determining the refrigeration capacity of the fluorine pump compression refrigeration system. The fluorine pump compression refrigeration system also includes other components and other parameters that can directly or indirectly reflect the refrigeration capacity of the fluorine pump compression refrigeration system. The above two groups of possible operating parameters are only the operating parameters that can be collected in this embodiment based on indoor and outdoor scenarios. In addition, the above two groups of operating parameters can also be used together as operating parameters for determining the estimated refrigeration capacity, and this embodiment does not limit this.

[0062] Furthermore, for the above two sets of operating parameters and outdoor temperature T out How to determine the estimated cooling capacity? This embodiment also provides a possible implementation scheme:

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

[0064] As shown in FIG. 2 , the above step S11 is specifically as follows:

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

[0066] The condenser cooling capacity prediction model is obtained by training a deep learning model with historical data of a fluorine pump compression refrigeration system. The historical data includes multiple data sets with outdoor temperature, condenser outlet pressure, condenser inlet pressure and outdoor fan speed as inputs and the actual cooling capacity of the corresponding fluorine pump compression refrigeration system as outputs.

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

[0068] As shown in FIG. 2 , the above step S11 is specifically as follows:

[0069] S11-B: Taking outdoor temperature, evaporator outlet pressure, evaporator inlet pressure and indoor fan speed as input, the estimated cooling capacity is determined by a pre-established evaporator cooling capacity prediction model.

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

[0071] It is not difficult to see from the above that in this embodiment, the calculation model of the condenser and evaporator in the corresponding fluorine pump compression refrigeration system is pre-established and trained by the deep learning algorithm, so as to convert the actually collected outdoor temperature T out and operation data (P1, P2, a, or P3, P4, b) as the input of the corresponding calculation model, the calculation model will output the estimated refrigeration capacity as a result. The refrigeration capacity estimation based on the deep learning model provided in this embodiment has high prediction accuracy, and based on the continuous operation of the fluorine pump compression refrigeration system during the application process, the operation data can be collected to further train and learn the calculation model, and the prediction accuracy can be continuously improved.

[0072] It should also be noted that the above two cooling capacity estimation schemes can be implemented separately or together. The implementation of both schemes can bring higher prediction accuracy. out As a "large" calculation model ("large" refers to the concept of model complexity relative to the first two calculation models), it puts forward higher requirements on the calculation performance of the execution subject of the present method (such as the controller in the fluorine pump compression refrigeration system). Therefore, it can be comprehensively judged according to the actual situation whether to estimate the refrigeration capacity based on one set of operating parameters or two sets of operating parameters, and this embodiment does not limit this.

[0073] Afterwards, for the above-mentioned step S12, that is, based on the estimated refrigeration capacity determined in step S11, the predetermined default switching temperature, and the refrigeration capacity of the fluorine pump compression refrigeration system at the set temperature of the default switching temperature corresponding to the default switching temperature, a step is performed to determine the real-time switching temperature adjusted according to the actual load situation. As can be seen from the above, in order to ensure the refrigeration effect, there is generally a positive correlation between the refrigeration capacity and the load of the fluorine pump compression refrigeration system, that is, the greater the load of the fluorine pump compression refrigeration system, the more refrigeration capacity needs to be output. Therefore, based on the default switching temperature and the refrigeration capacity corresponding to the default switching temperature, a benchmark for the corresponding relationship between the switching temperature and the refrigeration capacity can be determined. Based on this benchmark, another temperature value corresponding to the estimated refrigeration capacity determined in step S11 can be determined. This temperature value, that is, the switching temperature corresponding to the estimated refrigeration capacity, is a switching temperature adapted to the current system load situation.

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

[0075] S121: Determine an intermediate result value according to the ratio of the cooling capacity of the fluorine pump compression refrigeration system when the set temperature is the default switching temperature to the estimated cooling capacity.

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

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

[0078] T1=Q1 / Q0*T0;

[0079] Among them, T1 represents the real-time switching temperature; Q1 represents the estimated cooling capacity; T0 represents the default switching temperature; Q0 represents the cooling capacity of the fluorine pump compression refrigeration system when the set temperature is the default switching temperature. It should be noted that Q0 and T0 are both predicted calibration quantities obtained by testing the fluorine pump compression refrigeration system in a laboratory environment before it is officially put into use. The default switching temperature Q0 is the default switching temperature used as the standard when the fluorine pump compression refrigeration system controls the working mode switching before the first real-time switching temperature T1 is determined by this method. Or as shown in Figure 2, after the fluorine pump compression refrigeration system is turned on, it first determines the outdoor temperature T out Is it greater than the fluorine pump start-up temperature? If so, it will first run in the compressor mode, and then execute the above steps S11~S13.

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

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

[0082] Among them, 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 predetermined in advance based on testing and calculation. The correction coefficient k is used to calibrate and correct 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 under the working environment is more accurate.

[0083] Finally, it corresponds to step S13. Step S13 is a step for controlling the working mode switching 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 relevant technology, based on the relationship between the real-time outdoor temperature and the switching temperature, it is determined whether the fluorine pump compression refrigeration system operates in the fluorine pump mode or the compressor mode. If the real-time outdoor temperature < the switching temperature, it works in the fluorine pump mode; if the outdoor temperature > the switching temperature, it works in the compressor mode. The difference is that the switching temperature in the relevant technology is fixed, that is, the above-mentioned default switching temperature T0. The switching temperature in this embodiment is the real-time switching temperature T1 dynamically adjusted according to the real-time load conditions.

[0084] However, this embodiment further provides another working mode switching control scheme for a fluorine pump compression refrigeration system, as shown in FIG2 , the above step S13 specifically includes:

[0085] S131: Whenever a new real-time switching temperature is obtained, the outdoor temperature at the current moment is obtained.

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

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

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

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

[0090] As can be seen from the above, in this embodiment, the time from each time the real-time switching temperature T1 is obtained to the time when the real-time switching temperature T1 is obtained next time (excluding this time) is regarded as a control cycle. Corresponding to steps S131 to S133, the first working mode switching control of each control cycle is based on the current outdoor temperature T out and the real-time switching temperature T1. out > T1, it works in compressor mode. If T out ≤ T1, it works in fluorine pump mode. However, after the working mode is determined for the first time in this control cycle, that is, corresponding to steps S134 and S135, the switching from the current working mode to another working mode needs to meet the hysteresis setting. Specifically, switching from compressor mode to fluorine pump mode needs to meet T out ≤ T1- T a (T a That is, the first hysteresis mentioned above), otherwise even if T out ≤ T1, the current compressor mode is maintained. Similarly, switching from fluorine pump mode to compressor mode requires T out > T1+ T b (T b That is, the second hysteresis mentioned above), otherwise even if T out > T1, also maintain the current fluorine pump mode.

[0091] It should be noted that for the first hysteresis T a and the second hysteresis T b The value of is not limited in this embodiment and can be freely selected according to actual needs. And the first hysteresis T a and the second hysteresis T b The values ​​of can be equal or different. Considering the difficulty of deployment, the first hysteresis T a and the second hysteresis T b For example, in one possible implementation, the first hysteresis T a and the second hysteresis T b Both are 2℃.

[0092] This embodiment avoids frequent switching of the working mode of the fluorine pump compression refrigeration system by introducing the hysteresis setting. In particular, if the outdoor temperature fluctuates near the real-time switching temperature within a control cycle, the solution provided by this embodiment can effectively avoid the influence of small fluctuations on the switching control of the working mode of the fluorine pump compression refrigeration system. On the one hand, it avoids the problem of poor refrigeration effect and increased energy consumption caused by frequent switching of the working mode of the fluorine pump compression refrigeration system, and on the other hand, it can also avoid the problem of shortened working life due to frequent start and stop of the compressor and the fluorine pump.

[0093] On the other hand, in addition to the working mode switching control scheme of the fluorine pump compression refrigeration system provided in the above embodiment, this 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 obtain real-time indoor load information.

[0095] S22: Control the operating frequency and start / stop status of the variable frequency compressor according to the indoor load information.

[0096] Among them, for the above-mentioned step S21. This embodiment does not limit the cycle length for obtaining 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 scheme, 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-the set temperature T3, and the size and absolute value of the difference T2-T3 are more related to the sign. The closer the difference is to the positive infinity direction, the larger the difference is, that is, the larger the indoor load is.

[0097] With respect to the implementation scheme in which the indoor load information is the difference T2-T3 between the actual indoor temperature and the set indoor temperature, this embodiment further provides a specific implementation scheme of step S22. The above-mentioned step S22 specifically includes:

[0098] S221: If the actual indoor temperature is greater than the set indoor temperature, the variable frequency compressor is turned on, and the operating frequency of the variable frequency compressor is positively correlated with the difference between the actual indoor temperature and the set indoor temperature.

[0099] S222: If the actual indoor temperature is less than or equal to the indoor set temperature, the variable frequency compressor is turned off.

[0100] This embodiment provides a control scheme for the working control of the variable frequency compressor in the fluorine pump compression refrigeration system. The difference between the actual indoor temperature and the set temperature is used as the parameter basis for reflecting the indoor load size; when the indoor temperature T2≤set temperature T3, there is no indoor refrigeration demand, and the compressor is turned off at this time; and when the indoor temperature T2>set temperature T3, there is indoor refrigeration demand, and the compressor is turned on at this time; and the operating frequency of the compressor is positively correlated with the load size T2-T3. The larger the load size T2-T3, the higher the operating frequency of the compressor, and the fluorine pump compression refrigeration system can output more cooling capacity per unit time; conversely, the lower the operating frequency of the compressor, the less cooling capacity the fluorine pump compression refrigeration system outputs per unit time, but it is also more energy-efficient. Based on the control scheme provided by this embodiment, the compressor variable frequency control based on the indoor load is realized, so that the cooling capacity of the fluorine pump compression refrigeration system can better meet the actual needs, and can also save energy consumption 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 embodiment provides a corresponding control method for the working mode switching control of the fluorine pump compression refrigeration system, but does not impose any restrictions on the fluorine pump compression refrigeration system itself, and can be applied to various existing fluorine pump compression refrigeration systems. However, this embodiment provides an embodiment corresponding to a fluorine pump compression refrigeration system, as shown in FIG3, including: a controller (not shown in FIG3), an evaporating coil 1, a compressor 2, a condensing coil 3, a fluorine pump 4, a throttling device 5, a first check valve 7 and a second check valve 6.

[0102] The controller is used to implement the steps of the fluorine pump compression refrigeration system control method provided in the above embodiment, that is, at least to implement steps S11 to S13. The controller can be a built-in control device of the fluorine pump compression refrigeration system, or it can be an external other control device specifically used to switch the working mode of the fluorine pump compression refrigeration system. The controller can be a device or apparatus with control function such as a single-chip microcomputer, a digital signal processor (DSP), etc., and this embodiment does not limit this.

[0103] In addition, the principles of the fluorine pump compression refrigeration system provided in this embodiment operating in different working modes are as follows:

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

[0105] 2. Operation in fluorine pump mode: fluorine pump 4 is turned on, compressor 2 is turned off, first check valve 7 is opened, and second check valve 6 is closed. At this time, condensing coil 3, fluorine pump 4, throttling device 5 and evaporating 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, and will not be repeated here.

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

[0108] Based on the perspective of functional modules, this embodiment provides a fluorine pump compression refrigeration system control device, including:

[0109] A prediction module is used to determine the estimated cooling capacity based on 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.

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

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

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

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

[0114] It is understandable that if the method in the above embodiment 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 application is essentially 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, and the computer software product is stored in a storage medium to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program code.

[0115] The above is a detailed introduction to a fluorine pump compression refrigeration system and control method, device, and medium provided by the present application. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the present application.

[0116] It should also be noted that, in this specification, relational terms such as first and second, etc. 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 these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

Claims

1. A fluorine pump compression refrigeration system control method, characterized in that: include: 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; 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 when the set temperature is the default switching temperature; The working mode switching of the fluorine pump compression refrigeration system is controlled by the real-time switching temperature.

2. The fluorine pump compression refrigeration system control method according to claim 1, characterized in that: The operating parameters include: condenser outlet pressure, condenser inlet pressure and outdoor fan speed; Then the method of determining the estimated refrigeration capacity according to the outdoor temperature and the operating parameters of the fluorine pump compression refrigeration system includes: Taking the outdoor temperature, the condenser outlet pressure, the condenser inlet pressure and the outdoor fan speed as input, the estimated cooling capacity is determined by a pre-established condenser cooling capacity prediction model; Among them, the condenser cooling capacity prediction model is obtained by training a deep learning model through the historical data of the fluorine pump compression refrigeration system; the historical data includes multiple groups of data groups with the outdoor temperature, the condenser outlet pressure, the condenser inlet pressure and the outdoor fan speed as input, and the actual cooling capacity of the corresponding fluorine pump compression refrigeration system as output.

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

4. The fluorine pump compression refrigeration system control method according to claim 1, characterized in that: The determining of 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 when the set temperature is the default switching temperature comprises: Determining an intermediate result value according to a ratio of the refrigeration capacity of the fluorine pump compression refrigeration system when the set temperature is the default switching temperature to the estimated refrigeration capacity; The real-time switching temperature is determined according to the product of the intermediate result value and the default switching temperature.

5. The fluorine pump compression refrigeration system control method according to claim 1, characterized in that: The switching of the working mode of the fluorine pump compression refrigeration system by controlling the real-time switching temperature includes: Whenever the real-time switching temperature is newly obtained, the outdoor temperature at the current moment is obtained; If the outdoor temperature exceeds the real-time switching temperature, the compressor mode is entered; If the outdoor temperature does not exceed the real-time switching temperature, the fluorine pump mode is entered; When the fluorine pump compression refrigeration system enters the compressor mode, the real-time outdoor temperature is periodically acquired, and if the outdoor temperature is less than the difference between the real-time switching temperature and the first hysteresis, the fluorine pump compression refrigeration system is switched to enter the fluorine pump mode; When the fluorine pump compression refrigeration system enters the fluorine pump mode, the real-time outdoor temperature is periodically acquired. If the outdoor temperature is greater than the sum of the real-time switching temperature and the second hysteresis, the fluorine pump compression refrigeration system is switched to enter the compressor mode.

6. The fluorine pump compression refrigeration system control method according to any one of claims 1 to 5, characterized in that: 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: Periodically obtain real-time indoor load information; The operating frequency and start / stop state of the variable frequency compressor are controlled according to the indoor load information.

7. The fluorine pump compression refrigeration system control method according to claim 6, characterized in that: The indoor load information is the difference between the actual indoor temperature and the indoor set temperature; And the controlling the operating frequency and the start / stop state of the variable frequency compressor according to the indoor load information includes: If the actual indoor temperature is greater than the set indoor temperature, the variable frequency compressor is turned on, and the operating frequency of the variable frequency compressor is positively correlated with the difference between the actual indoor temperature and the set indoor temperature; If the actual indoor temperature is less than or equal to the set indoor temperature, the variable frequency compressor is in an off state.

8. A fluorine pump compression refrigeration system, characterized in that: include: Controller, evaporating coil, compressor, condensing coil, fluorine pump, throttling device, first check valve and second check valve; Wherein, the controller is used to implement the steps of the fluorine pump compression refrigeration system control method as described in any one of claims 1 to 7.

9. A fluorine pump compression refrigeration system control device, characterized in that: include: A prediction module, for determining an estimated cooling capacity according to an outdoor temperature and operating parameters of a fluorine pump compression refrigeration system; wherein the operating parameters include: a condenser outlet pressure, a condenser inlet pressure, and an outdoor fan speed; and / or, the operating parameters include: an evaporator outlet pressure, an evaporator inlet pressure, and an indoor fan speed; A determination module, used for determining 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 when the set temperature is the default switching temperature; The application module is used to control the working mode switching of the fluorine pump compression refrigeration system through the real-time switching temperature.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the fluorine pump compression refrigeration system control method according to any one of claims 1 to 7 are implemented.

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