Control method, equipment and system of refrigerating system

Abstract

The invention discloses a control method, device and system of a refrigerating system. The method comprises the steps that target parameter data during operation of the refrigerating system are determined; on the basis of the target parameter data, the switching point temperature used for switching from a compressor mode to a fluorine pump mode is calculated; acquiring a monitored outdoor environment temperature; and on the basis of the outdoor environment temperature and the switching point temperature, the switching result of the operation mode of the refrigerating system is determined.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration technology, and in particular to a control method and control device for a refrigeration system, and a refrigeration system. Background Art

[0002] In today's climate of environmental protection and energy conservation, the energy savings offered by natural cooling technology are significant. Not only can users save significant amounts on electricity bills, but it also aligns with global low-carbon energy conservation strategies. Among the numerous energy-saving air conditioning solutions, the fluorine pump dual-circulation air conditioning system stands out. As an emerging energy-saving technology for data centers in recent years, this system utilizes a variable-frequency compressor and a fluorine pump to automatically switch operating modes based on outdoor temperature. In autumn and winter, this system can fully utilize natural cooling resources, significantly reducing the power usage effectiveness (PUE) of data centers, demonstrating its broad potential and potential for widespread adoption.

[0003] Existing refrigeration systems have two main operating modes: compressor mode and fluorine pump mode. The switching conditions between the two modes have a significant impact on the system's annual energy efficiency ratio, so choosing the best time to switch modes can achieve optimal energy savings. Currently, the mode switching conditions commonly used in existing technologies are relatively simple, usually automatically switching based on a set outdoor temperature point, or switching by judging the compressor pressure ratio, or switching by judging the cooling demand. These switching methods do not take into account the differences in the unit's installation environment, device configuration, and operating load. The mode switching point is not accurate enough, which is not conducive to reducing the system's annual energy efficiency ratio. Summary of the Invention

[0004] In order to solve the existing technical problems, the present invention provides a control method, control equipment and refrigeration system for a refrigeration system, which can accurately calculate the entry temperature point of entering the fluorine pump mode, so that the refrigeration system can enter the fluorine pump mode as early as possible, thereby improving the overall energy efficiency of the unit.

[0005] In a first aspect, a control method for a refrigeration system is provided, comprising: determining target parameter data when the refrigeration system is operating; calculating a switching point temperature for switching from a compressor mode to a fluorine pump mode based on the target parameter data; obtaining a monitored outdoor ambient temperature; and determining a switching result of the operating mode of the refrigeration system based on the outdoor ambient temperature and the switching point temperature.

[0006] In a second aspect, a control device is provided, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes a control method for a refrigeration system as described in any one of the first aspects of the present application.

[0007] In a third aspect, a refrigeration system is provided, comprising the control device, evaporator, compressor, condenser and fluorine pump as described in the second aspect.

[0008] In a fourth aspect, a computer program product is provided, comprising a computer program, wherein when the computer program is executed by a processor, the computer program implements a control method for a refrigeration system as described in any one of the first aspects of the present application.

[0009] This application determines the target parameter data when the refrigeration system is running; based on the target parameter data and based on the current evaporator's heat exchange efficiency, the switching point temperature is inferred, and the monitored outdoor ambient temperature is directly compared with the switching point temperature to determine the switching result of the operating mode. Even if the evaporator is blocked by dirt or obstacles, its impact on the current system can be calculated, thereby avoiding incorrect mode switching. This application can accurately calculate the entry temperature point into the fluorine pump mode, so that the refrigeration system can enter the fluorine pump mode as early as possible, thereby improving the overall energy efficiency of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a diagram of an application environment of a control method for a refrigeration system in one embodiment;

[0011] Figure 2 is a flow chart of a control method for a refrigeration system in one embodiment;

[0012] Figure 3 is a flow chart of a method for controlling a refrigeration system in another embodiment;

[0013] Figure 4 is a schematic diagram of a control device for a refrigeration system in one embodiment;

[0014] Figure 5 Schematic diagram of a control device in one embodiment. DETAILED DESCRIPTION

[0015] The technical solution of the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the scope of protection of the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0017] In the following description, reference is made to “some embodiments” which describe a subset of all possible embodiments, but it should be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0018] See Figure 1 , is an application environment diagram of a control method for a refrigeration system in one embodiment. The refrigeration system in the application environment diagram includes an indoor unit (dashed line block diagram on the right) and an outdoor unit (dashed line block diagram on the left), and the indoor unit includes at least an evaporator, an indoor fan, an evaporation pressure sensor, a compressor, and an exhaust pressure sensor. The outdoor unit includes at least a condenser, a condensing fan, a liquid storage tank, a fluorine pump inlet pressure sensor, and a fluorine pump. It can be understood that the indoor unit can also include at least one of the following: a drying filter, an electronic expansion valve, and a one-way valve. The outdoor unit can also include at least one of the following: a one-way valve, a fluorine pump outlet pressure sensor. The compressor is the power source of the entire refrigeration cycle. The refrigeration system can be either a split unit or an integrated unit, and can be a single system or a multi-system unit. In some embodiments, the refrigeration system includes a control device, an evaporator, a compressor, a condenser, and a fluorine pump, without the need to divide the indoor unit and the outdoor unit.

[0019] In compressor mode, the compressor draws in low-temperature, low-pressure refrigerant gas from the evaporator, compresses it into high-temperature, high-pressure refrigerant gas through work, and discharges it into the condenser. The high-temperature, high-pressure refrigerant gas enters the condenser. The condensing fan operates to flow outside air through the condenser, transferring heat from the refrigerant gas to the outside air. In the condenser, the refrigerant gas releases heat and condenses into a high-temperature, high-pressure liquid. The high-temperature, high-pressure liquid exiting the condenser passes through a throttling device (such as an electronic expansion valve). This throttling device causes the refrigerant liquid pressure and temperature to drop sharply, turning it into a low-temperature, low-pressure gas-liquid mixture, creating conditions for the refrigerant to evaporate and absorb heat in the evaporator. This low-temperature, low-pressure refrigerant gas-liquid mixture enters the evaporator. The indoor fan forces indoor air through the evaporator, where the refrigerant absorbs heat from the air and evaporates into a low-temperature, low-pressure gas, thereby cooling the indoor air. The evaporated refrigerant gas is then drawn back into the compressor, continuing the next refrigeration cycle.

[0020] In fluorine pump mode, when the outdoor air temperature is lower than the indoor air temperature in a low-temperature environment, the outdoor air becomes a significant natural cooling source. In fluorine pump mode, the refrigerant directly exchanges heat with the outdoor cooling source, eliminating the need for the compressor to work to raise the refrigerant temperature and pressure as in compressor mode. This allows the refrigerant to effectively dissipate heat in the low-temperature environment, thereby saving compressor energy. The refrigerant evaporates in the evaporator, absorbing heat from the indoor air and lowering the indoor air temperature, thereby achieving a cooling effect. The gaseous refrigerant in the evaporator, after exchanging heat with the indoor air, is extracted by the fluorine pump and naturally condensed, dissipating heat in the low-temperature environment. The gaseous refrigerant releases heat to the outdoor air, cooling itself and liquefying. The liquid refrigerant flows through the pipeline, overcomes pipe resistance, and returns to the evaporator, where it evaporates again and absorbs heat, repeating the cycle.

[0021] like Figure 1 As shown, the system further includes at least one of the following: a vapor pressure sensor, an exhaust pressure sensor, and a fluorine pump inlet pressure sensor. The vapor pressure sensor is disposed at the outlet of the evaporator and is used to measure the vapor saturation pressure at the outlet of the evaporator. The exhaust pressure sensor is disposed at the exhaust port of the compressor and is used to measure the exhaust pressure of the compressor in compressor mode. The fluorine pump inlet pressure sensor is disposed at the inlet of the fluorine pump and is used to measure the condensing pressure of the condenser in compressor mode. The system may further include a fluorine pump outlet pressure sensor. The fluorine pump inlet pressure sensor and the fluorine pump outlet pressure sensor can be used to measure the pressure of the fluorine pump when it is operating.

[0022] In the prior art, a fluorine pump air conditioner can be controlled to enter pure fluorine pump mode by ensuring that the difference between the target condensing temperature of the fluorine pump air conditioner and the outdoor ambient temperature is greater than or equal to a first threshold; the difference between the average indoor return air temperature and the outdoor ambient temperature is greater than or equal to a second threshold; and the total indoor cooling load is less than or equal to the outdoor condenser heat exchange capacity. The prior art suffers from the following drawbacks:

[0023] 1. The temperature difference between the outdoor ambient temperature and the target condensing temperature needs to be determined through on-site testing or refrigeration system simulation analysis to find a reasonable value. If this temperature difference value is determined through simulation analysis, it is difficult to guarantee its accuracy. If it is determined through on-site testing, it requires on-site conditions and a lot of testing work, which is not universal.

[0024] 2. The temperature difference between the average indoor return air temperature and the outdoor ambient wet-bulb temperature requires theoretical calculation and simulation analysis to obtain a preliminary value, which is then adjusted and optimized through field testing and long-term operation data. The confirmation of this value requires the support of measured data, and different device configurations of different units will lead to different values, so its value is also not universal.

[0025] 3. Calculation of the outdoor condenser heat exchange rate: The air velocity through the condenser, as measured by a wind speed sensor, is used to calculate the air volume. Given a known condenser heat transfer coefficient, the outdoor condenser heat exchange rate can be calculated in real time. The air velocity detected by the wind speed sensor can vary significantly and be affected by ambient weather conditions. Furthermore, the condenser heat transfer coefficient can also be affected by factors such as condenser contamination and blockage.

[0026] Existing technologies are difficult to implement and the accuracy of the model may be affected by changes in environmental factors.

[0027] See also Figure 2 , is a flow chart of a control method for a refrigeration system provided in one embodiment of the present application. The control method for a refrigeration system is applied to a control device, and the control method for a refrigeration system includes the following steps:

[0028] S10: Determine target parameter data when the refrigeration system is running.

[0029] In this embodiment, the refrigeration system includes two operating modes: compressor mode and fluorine pump mode. During operation, the two modes can be switched between. When the compressor mode start conditions are met, the compressor mode is activated. When the fluorine pump mode start conditions are met, the fluorine pump mode is activated. The target parameter data is based on parameter data collected during refrigeration system operation, or is calculated based on the collected parameter data.

[0030] S11. Calculating a switching point temperature for switching from a compressor mode to a fluorine pump mode based on target parameter data.

[0031] In this embodiment, the switching point temperature is the critical temperature for switching from compressor mode to fluorine pump mode. The switching point temperature must meet the following conditions: ① The indoor heat exchange rate is equal in compressor mode and fluorine pump mode, that is, the evaporator heat exchange rate remains unchanged; ② In compressor mode, the evaporator heat exchange rate + compressor power = condenser heat exchange rate; ③ In fluorine pump mode, the evaporator heat exchange rate + fluorine pump power = condenser heat exchange rate. The switching point temperature can be inferred by satisfying these three conditions and the operating principle of the refrigeration system. If the machine room load does not change, the evaporator heat exchange rate can be assumed to remain unchanged.

[0032] S12. Obtain the monitored outdoor ambient temperature.

[0033] In this embodiment, the outdoor ambient temperature refers to the temperature of the outdoor environment in which the outdoor unit is located. A temperature sensor may be provided at a location where the outdoor unit contacts the outdoor environment, and the outdoor ambient temperature may be collected by the temperature sensor.

[0034] S13: Determine a switching result of the operating mode of the refrigeration system based on the outdoor ambient temperature and the switching point temperature.

[0035] In this embodiment, since the switch point temperature represents the critical temperature point for switching from compressor mode to fluorine pump mode, the switch result can be determined by directly comparing the monitored outdoor ambient temperature with the switch point temperature. Because the switch point temperature is inferred based on the equal cooling capacity of the indoor and outdoor units, it is not limited by different application sites and scenarios and has universal applicability. Furthermore, there is no need to fit and analyze the temperature difference between the outdoor ambient temperature and the condensing temperature to find a reasonable temperature difference value, making this switch determination method more practical and accurate.

[0036] In the above embodiment, the target parameter data for the operation of the refrigeration system is determined; based on the target parameter data and on the basis of the heat exchange efficiency of the current evaporator, the switching point temperature is inferred, and the monitored outdoor ambient temperature is directly compared with the switching point temperature to determine the switching result of the operating mode. Even if the evaporator is blocked by dirt or obstacles, its impact on the current system can be calculated, thereby avoiding incorrect mode switching. The present application can accurately calculate the entry temperature point for entering the fluorine pump mode, so that the refrigeration system can enter the fluorine pump mode as early as possible, thereby improving the overall energy efficiency of the unit.

[0037] In some embodiments, the target parameter data includes at least one of the following: the ratio of the maximum air volume value of the condensing fan of the condenser in the refrigeration system to the air volume of the condensing fan in the compressor mode, the evaporation saturation temperature of the evaporator in the refrigeration system, the saturated condensation temperature of the condenser in the compressor mode, and the saturation temperature drop between the connecting air pipes of the indoor unit and the outdoor unit of the refrigeration system in the fluorine pump mode. Figure 2 FIG. 1 is a flow chart of a control method for a refrigeration system provided in another embodiment of the present application. Specifically, the method includes the following steps:

[0038] S21. Determine an air volume ratio between a maximum air volume value of a condensing fan of a condenser in a refrigeration system and an air volume of the condensing fan in a compressor mode.

[0039] Optionally, determining the air volume ratio between the maximum air volume value of the condensing fan of the condenser in the refrigeration system and the air volume of the condensing fan in the compressor mode includes:

[0040] Obtaining a maximum air volume value of a condensing fan of the condenser and obtaining a speed of the condensing fan in a compressor mode;

[0041] Calculating the air volume of the condensing fan in compressor mode according to the rotational speed;

[0042] The ratio of the maximum air volume value to the air volume is used as the air volume ratio.

[0043] In this embodiment, the air volume of the condensing fan in compressor mode is related to the speed of the condensing fan. A mapping relationship between the speed and air volume of the condensing fan in compressor mode can be obtained in advance. Based on the mapping relationship between the speed and air volume and the speed of the condensing fan in compressor mode, the air volume of the condensing fan in compressor mode can be obtained. Multiple sets of speed and air volume values of the condensing fan can be collected in compressor mode. Each set of speed and air volume values can be used as a sampling point. The multiple sets of speed and air volume values can be fitted using a fitting method to obtain a mapping relationship between the speed and air volume of the condensing fan in compressor mode.

[0044] S22. Determine the evaporation saturation temperature of the evaporator in the refrigeration system.

[0045] Optionally, determining the evaporation saturation temperature of the evaporator in the refrigeration system includes:

[0046] The evaporation saturation pressure at the outlet of the evaporator in the refrigeration system is obtained by an evaporation pressure sensor, and the evaporation saturation temperature of the evaporator is calculated according to the evaporation saturation pressure.

[0047] In this embodiment, the evaporation saturation temperature can be obtained based on the evaporation saturation pressure-evaporation saturation temperature mapping relationship and the evaporation saturation pressure. The evaporation saturation pressure-evaporation saturation temperature mapping relationship can be a formula derived using thermodynamic methods, or can be obtained by collecting multiple sets of evaporation saturation pressure values and evaporation saturation temperature values and fitting the multiple sets of evaporation saturation pressure values and evaporation saturation temperature values to obtain the evaporation saturation pressure-evaporation saturation temperature mapping relationship.

[0048] S23. Determine the saturated condensing temperature of the condenser when in compressor mode.

[0049] Optionally, determining the saturated condensing temperature of the condenser in the compressor mode includes:

[0050] The condensation saturation pressure at the outlet of the condenser when in compressor mode is obtained through the fluorine pump inlet pressure sensor, and the saturated condensation temperature of the condenser when in compressor mode is calculated based on the condensation saturation pressure.

[0051] In this embodiment, the saturated condensing temperature can be calculated based on the mapping relationship between the condensing saturated pressure and the saturated condensing temperature and the condensing saturated pressure. The mapping relationship between the condensing saturated pressure and the saturated condensing temperature can be a formula derived from thermodynamic methods, or can be obtained by collecting multiple sets of condensing saturated pressure values and saturated condensing temperature values and fitting the multiple sets of condensing saturated pressure values and saturated condensing temperature values.

[0052] S24: Determine the saturation temperature drop between the connecting gas pipes of the indoor unit and the outdoor unit of the refrigeration system in the fluorine pump mode.

[0053] Optionally, determining the saturation temperature drop between the connecting air pipes of the indoor unit and the outdoor unit of the refrigeration system in the fluorine pump mode includes:

[0054] The exhaust pressure of the compressor in the compressor mode is measured by an exhaust pressure sensor, and the condensing pressure of the condenser in the compressor mode is measured by a fluorine pump inlet pressure sensor;

[0055] Calculate the pressure drop between the connecting air pipes of the indoor unit and the outdoor unit in compressor mode according to the exhaust pressure and the condensing pressure;

[0056] The saturation temperature drop is calculated based on the pressure drop.

[0057] In this embodiment, the pressure drop represents the absolute value of the difference between the exhaust pressure and the condensing pressure. According to the pressure drop between the connecting air pipes of the indoor unit and the outdoor unit in the compressor mode. The parameter data of the two operating modes, namely the compressor mode and the fluorine pump mode, can be collected in advance, wherein the parameter data includes but is not limited to: pipe diameter, length, flow rate, density, viscosity. Based on the parameter data in the compressor mode and the fluorine pump mode, the pressure drop ratio relationship between the two modes is calculated respectively using the Churchill formula. According to the pressure drop between the connecting air pipes of the indoor unit and the outdoor unit in the compressor mode and the pressure drop ratio relationship between the two modes, the pressure drop between the connecting air pipes of the indoor unit and the outdoor unit in the fluorine pump mode can be obtained. Multiple sets of pressure drop values and saturation temperature drop values between the connecting air pipes of the indoor unit and the outdoor unit under the fluorine pump mode can be collected in advance, and the multiple sets of pressure drop values and saturation temperature drop values can be fitted to obtain a mapping relationship between the pressure drop and saturation temperature drop between the connecting air pipes of the indoor unit and the outdoor unit under the fluorine pump mode. According to the mapping relationship between the pressure drop and saturation temperature drop between the connecting air pipes of the indoor unit and the outdoor unit under the fluorine pump mode and the pressure drop between the connecting air pipes of the indoor unit and the outdoor unit under the fluorine pump mode, the saturation temperature drop between the connecting air pipes of the indoor unit and the outdoor unit under the fluorine pump mode can be obtained.

[0058] S25. Calculate the switching point temperature based on the air volume ratio, the evaporation saturation temperature, the saturation condensation temperature, and the saturation temperature drop.

[0059] Optionally, the calculating the switching point temperature according to the air volume ratio, the evaporation saturation temperature, the saturation condensation temperature, and the saturation temperature drop includes:

[0060] Calculating the switching point temperature according to the air volume ratio, the evaporation saturation temperature, the saturation condensation temperature, and the saturation temperature drop, and calculating the switching point temperature using a switching point temperature calculation formula;

[0061] The switching point temperature calculation formula is as follows:

[0062]

[0063] Where T m represents the switching point temperature, f1 represents the air volume ratio, T e represents the evaporation saturation temperature, T c represents the saturated condensation temperature, and f2 represents the saturation temperature drop.

[0064] More specifically,

[0065]

[0066] Where f(R) represents the ratio of air volume and R represents the speed of the condensing fan in compressor mode. d ,P c ) represents the saturation temperature drop between the connecting gas pipes of the indoor unit and the outdoor unit in fluorine pump mode, P d Indicates the discharge pressure of the compressor in compressor mode, P c Indicates the condensing pressure of the condenser in compressor mode.

[0067] S26. Obtain the monitored outdoor ambient temperature.

[0068] S27: Determine a switching result of the operating mode of the refrigeration system based on the outdoor ambient temperature and the switching point temperature.

[0069] It is understandable that the above steps S21 to S24 are refinements of S10, and step S25 is a refinement of S11.

[0070] The above embodiment comprehensively considers the indoor unit's evaporation saturation temperature, air volume ratio, saturated condensing temperature, and the saturation temperature drop between the indoor and outdoor unit air pipes in fluorine pump mode. This allows for accurate calculation of the outdoor ambient temperature required for the fluorine pump cooling capacity to meet the room load, while also adapting to different device configurations and installation conditions. This ensures the unit enters fluorine pump mode as early as possible, saving energy, while also preventing the unit from entering fluorine pump mode too early and then switching back to compressor mode due to insufficient cooling capacity, causing oscillation.

[0071] In some embodiments, determining the switching result of the operating mode of the refrigeration system based on the outdoor ambient temperature and the switching point temperature includes:

[0072] When the outdoor ambient temperature is lower than the switching point temperature, the operation mode of the refrigeration system is switched to the fluorine pump mode.

[0073] In this embodiment, when a refrigeration system in the unit operates in compressor mode, as the outdoor ambient temperature decreases, the refrigeration capacity that the fluorine pump can exert becomes greater and greater. When the outdoor ambient temperature is lower than the switching point temperature, it is determined that the fluorine pump mode at this time can exert sufficient refrigeration capacity to meet the current load requirements, thereby allowing the system to switch from compressor mode to fluorine pump mode.

[0074] In the above embodiment, by directly comparing the outdoor ambient temperature with the switching point temperature to determine the timing of entering the fluorine pump mode, the refrigeration system can enter the fluorine pump mode as early as possible, thereby improving the overall energy efficiency of the unit.

[0075] In some embodiments, determining the switching result of the operating mode of the refrigeration system based on the outdoor ambient temperature and the switching point temperature includes:

[0076] When the outdoor ambient temperature is greater than or equal to the switching point temperature and the first condition or the second condition is met, the operating mode of the refrigeration system is switched to the compressor mode, wherein the first condition includes that the difference between the actual supply air temperature and the set temperature is greater than the temperature threshold, and the second condition includes that the speed of the condensing fan is greater than the speed threshold.

[0077] In this embodiment, when the refrigeration system operates in the fluorine pump mode, as the outdoor ambient temperature increases, the refrigeration capacity of the fluorine pump becomes smaller and smaller. When the outdoor ambient temperature is greater than or equal to the switching point temperature, and the first condition or the second condition is met, it is determined that there is not much room for adjusting the cooling capacity of the fluorine pump mode at this time, so the system is switched from the fluorine pump mode to the compressor mode.

[0078] In this embodiment, for example, if the user sets the supply air temperature to 21°C, the set temperature is 21°C. If the temperature and humidity sensor detects a value of 24°C, the actual supply air temperature is 24°C. The first threshold can be set to 1°C. When the above switching conditions are met, it is necessary to switch to the compressor mode. This is to avoid the supply air temperature being too high when the fluorine pump capacity is insufficient, which may not meet the customer's set requirements. Therefore, it is necessary to switch to the compressor mode, which has a more sufficient cooling capacity.

[0079] In the fluorine pump mode, the faster the outdoor fan speed is, the larger the heat exchanger of the condenser will be. As the outdoor temperature gets higher and higher, the heat exchange temperature difference of the condenser will decrease. Under the condition of the same heat exchange rate, the air volume needs to be increased. The fan speed is 100% at the maximum air volume. In order to prevent the sudden increase in the load of the computer room and the condensing fan from having insufficient margin to adjust, resulting in a higher supply air temperature, the speed threshold setting value is generally smaller than 100%, and can be set to 90% or 95%.

[0080] In the above embodiment, when the outdoor ambient temperature is high, the compressor mode is operated, and when the outdoor ambient temperature is low, the compressor stops and the fluorine pump mode is operated. By directly comparing the outdoor ambient temperature with the switching point temperature to determine the timing of entering the fluorine pump mode, the refrigeration system can enter the fluorine pump mode as early as possible, thereby improving the overall energy efficiency of the unit.

[0081] On the other hand, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the control method of the refrigeration system described in any embodiment of the present application.

[0082] Among them, in the computer program product, the optional implementation form of the program module architecture of the computer program that implements each step of the control method of a refrigeration system can be a control device for a refrigeration system, such as Figure 4 As shown, the control device of the refrigeration system includes: a determination module 31, which is used to determine the target parameter data when the refrigeration system is running; a calculation module 32, which is used to calculate the switching point temperature for switching from the compressor mode to the fluorine pump mode based on the target parameter data; the acquisition module 33 is also used to obtain the monitored outdoor ambient temperature; the determination module 33 is also used to determine the switching result of the operating mode of the refrigeration system based on the outdoor ambient temperature and the switching point temperature.

[0083] Optionally, the determining module 31 is further configured to:

[0084] Determining an air volume ratio between a maximum air volume value of a condensing fan of a condenser in the refrigeration system and an air volume value of the condensing fan in a compressor mode;

[0085] determining an evaporation saturation temperature of an evaporator in the refrigeration system;

[0086] determining a saturated condensing temperature of the condenser when in compressor mode;

[0087] Determine the saturation temperature drop between the connecting gas pipes of the indoor unit and the outdoor unit of the refrigeration system in the fluorine pump mode;

[0088] The calculating of the switching point temperature for switching from the compressor mode to the fluorine pump mode based on the target parameter data includes:

[0089] The switching point temperature is calculated according to the air volume ratio, the evaporation saturation temperature, the saturation condensation temperature, and the saturation temperature drop.

[0090] Optionally, the calculation module 32 is further configured to:

[0091] Calculating the switching point temperature according to the air volume ratio, the evaporation saturation temperature, the saturation condensation temperature, and the saturation temperature drop, and calculating the switching point temperature using a switching point temperature calculation formula;

[0092] The switching point temperature calculation formula is as follows:

[0093]

[0094] Where T m represents the switching point temperature, f1 represents the air volume ratio, T e represents the evaporation saturation temperature, T c represents the saturated condensation temperature, and f2 represents the saturation temperature drop.

[0095] Optionally, the determining module 31 is further configured to:

[0096] Obtaining a maximum air volume value of a condensing fan of the condenser and obtaining a speed of the condensing fan in a compressor mode;

[0097] Calculating the air volume of the condensing fan in compressor mode according to the rotational speed;

[0098] The ratio of the maximum air volume value to the air volume is used as the air volume ratio.

[0099] Optionally, the determining module 31 is further configured to:

[0100] obtaining an evaporation saturation pressure at an outlet of an evaporator in the refrigeration system through an evaporation pressure sensor, and calculating an evaporation saturation temperature of the evaporator based on the evaporation saturation pressure;

[0101] Determining the saturated condensing temperature of the condenser when in the compressor mode includes:

[0102] The condensation saturation pressure at the outlet of the condenser when in compressor mode is obtained through the fluorine pump inlet pressure sensor, and the saturated condensation temperature of the condenser when in compressor mode is calculated based on the condensation saturation pressure.

[0103] Optionally, the determining module 31 is further configured to:

[0104] The exhaust pressure of the compressor in the compressor mode is measured by an exhaust pressure sensor, and the condensing pressure of the condenser in the compressor mode is measured by a fluorine pump inlet pressure sensor;

[0105] Calculate the pressure drop between the connecting air pipes of the indoor unit and the outdoor unit in compressor mode according to the exhaust pressure and the condensing pressure;

[0106] The saturation temperature drop is calculated based on the pressure drop.

[0107] Optionally, the determining module 33 is further configured to:

[0108] When the outdoor ambient temperature is lower than the switching point temperature, the operation mode of the refrigeration system is switched to a fluorine pump mode;

[0109] When the outdoor ambient temperature is greater than or equal to the switching point temperature and the first condition or the second condition is met, the operating mode of the refrigeration system is switched to the compressor mode, wherein the first condition includes that the difference between the actual supply air temperature and the set temperature is greater than the temperature threshold, and the second condition includes that the speed of the condensing fan is greater than the speed threshold.

[0110] The above mainly introduces the solution provided by the embodiment of the present application from the perspective of the method. In order to realize the above functions, the control device of the refrigeration system includes hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0111] In the embodiment of the present application, the control device of the refrigeration system can be divided into functional modules according to the above method. For example, the control device of the refrigeration system can include functional modules corresponding to the functional divisions, or two or more functions can be integrated into one processing module. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical functional division. In actual implementation, there may be other division methods.

[0112] See also Figure 5 On the other hand, an embodiment of the present application further provides a control device 10, including a processor 13 and a memory 14, wherein the memory 14 stores a computer program. When the computer program is executed by the processor, the processor 13 executes the steps of a control method for a refrigeration system provided in any of the above embodiments of the present application.

[0113] The processor 13 serves as the control center, connecting the various components of the control device using various interfaces and circuits. It executes the various functions of the control device and processes data by running or executing software programs and / or modules stored in the memory 14 and accessing data stored in the memory 14. Optionally, the processor 13 may include one or more processing cores; preferably, the processor 13 may integrate an application processor and a modem processor, with the application processor primarily processing the operating system, user interfaces, and application programs, while the modem processor primarily handles wireless communications. It is understood that the modem processor may not be integrated into the processor 13.

[0114] The memory 14 can be used to store software programs and modules. The processor 13 executes various functional applications and data processing by running the software programs and modules stored in the memory 14. The memory 14 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data created based on the use of a control device, etc. In addition, the memory 14 can include a high-speed random access memory and can also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage device. Accordingly, the memory 14 can also include a memory processor to provide the processor 13 with access to the memory 14.

[0115] On the other hand, an embodiment of the present application further provides a computer-readable non-volatile storage medium storing a computer program. When the computer program is executed by a processor, the processor executes the steps of a control method for a refrigeration system provided in any of the above embodiments of the present application.

[0116] In another aspect of an embodiment of the present application, a computer program product is provided, comprising a computer program, wherein when the computer program is executed by a processor, the computer program implements a control method for a refrigeration system as described in any embodiment of the present application.

[0117] On the other hand, an embodiment of the present application provides a refrigeration system, which enables a processor to execute the steps of a control method of a refrigeration system provided by any of the above embodiments of the present application.

[0118] Those skilled in the art will appreciate that all or part of the processes in the methods provided in the above embodiments can be implemented by instructing the relevant hardware through a computer program. The program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0119] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. The scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A control method for a refrigeration system, characterized in that: include: Determine target parameter data when the refrigeration system is running; Based on the target parameter data, calculating a switching point temperature for switching from a compressor mode to a fluorine pump mode; Get the monitored outdoor ambient temperature; A switching result of the operating mode of the refrigeration system is determined based on the outdoor ambient temperature and the switching point temperature.

2. The control method of the refrigeration system according to claim 1, characterized in that: The target parameter data for determining the operation of the refrigeration system includes: Determining an air volume ratio between a maximum air volume value of a condensing fan of a condenser in the refrigeration system and an air volume value of the condensing fan in a compressor mode; determining an evaporation saturation temperature of an evaporator in the refrigeration system; determining a saturated condensing temperature of the condenser when in compressor mode; Determine the saturation temperature drop between the connecting gas pipes of the indoor unit and the outdoor unit of the refrigeration system in the fluorine pump mode; The calculating of the switching point temperature for switching from the compressor mode to the fluorine pump mode based on the target parameter data includes: The switching point temperature is calculated according to the air volume ratio, the evaporation saturation temperature, the saturation condensation temperature, and the saturation temperature drop.

3. The control method of the refrigeration system according to claim 2, wherein: The calculating the switching point temperature according to the air volume ratio, the evaporation saturation temperature, the saturation condensation temperature, and the saturation temperature drop includes: Calculating the switching point temperature according to the air volume ratio, the evaporation saturation temperature, the saturation condensation temperature, and the saturation temperature drop, and calculating the switching point temperature using a switching point temperature calculation formula; The switching point temperature calculation formula is as follows: Where T m represents the switching point temperature, f1 represents the air volume ratio, T e represents the evaporation saturation temperature, T c represents the saturated condensation temperature, and f2 represents the saturation temperature drop.

4. The control method of the refrigeration system according to claim 2, wherein: Determining the air volume ratio between the maximum air volume value of the condensing fan of the condenser in the refrigeration system and the air volume of the condensing fan in the compressor mode includes: Obtaining a maximum air volume value of a condensing fan of the condenser and obtaining a speed of the condensing fan in a compressor mode; Calculating the air volume of the condensing fan in compressor mode according to the rotational speed; The ratio of the maximum air volume value to the air volume is used as the air volume ratio.

5. The control method of the refrigeration system according to claim 2, wherein: Determining the evaporation saturation temperature of the evaporator in the refrigeration system includes: obtaining an evaporation saturation pressure at an outlet of an evaporator in the refrigeration system through an evaporation pressure sensor, and calculating an evaporation saturation temperature of the evaporator based on the evaporation saturation pressure; Determining the saturated condensing temperature of the condenser when in the compressor mode includes: The condensation saturation pressure at the outlet of the condenser when in compressor mode is obtained through the fluorine pump inlet pressure sensor, and the saturated condensation temperature of the condenser when in compressor mode is calculated based on the condensation saturation pressure.

6. The control method of the refrigeration system according to claim 2, wherein: Determining the saturation temperature drop between the connecting gas pipes of the indoor unit and the outdoor unit of the refrigeration system in the fluorine pump mode includes: The exhaust pressure of the compressor in the compressor mode is measured by an exhaust pressure sensor, and the condensing pressure of the condenser in the compressor mode is measured by a fluorine pump inlet pressure sensor; Calculate the pressure drop between the connecting air pipes of the indoor unit and the outdoor unit in compressor mode according to the exhaust pressure and the condensing pressure; The saturation temperature drop is calculated based on the pressure drop.

7. The control method of the refrigeration system according to claim 1, wherein: The determining, based on the outdoor ambient temperature and the switching point temperature, a result of switching the operating mode of the refrigeration system includes: When the outdoor ambient temperature is lower than the switching point temperature, the operation mode of the refrigeration system is switched to a fluorine pump mode; When the outdoor ambient temperature is greater than or equal to the switching point temperature and the first condition or the second condition is met, the operating mode of the refrigeration system is switched to the compressor mode, wherein the first condition includes that the difference between the actual supply air temperature and the set temperature is greater than the temperature threshold, and the second condition includes that the speed of the condensing fan is greater than the speed threshold.

8. A control device, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the control method of a refrigeration system according to any one of claims 1 to 7.

9. A refrigeration system, characterized in that: It comprises the control device as claimed in claim 8, an evaporator, a compressor, a condenser and a fluorine pump.

10. The refrigeration system according to claim 9, wherein: The system also includes a steam pressure sensor, an exhaust pressure sensor and a fluorine pump inlet pressure sensor. The steam pressure sensor is arranged at the outlet of the evaporator, the exhaust pressure sensor is arranged at the exhaust port of the compressor, and the fluorine pump inlet pressure sensor is arranged at the inlet of the fluorine pump.

11. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, a control method for a refrigeration system according to any one of claims 1 to 7 is implemented.

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