Control method and device of refrigerating system, electronic equipment and storage medium

Abstract

The invention discloses a control method and device of a refrigerating system, electronic equipment and a storage medium, and relates to the technical field of data center machine rooms. The control method comprises the steps that the real-time indoor and outdoor temperature difference obtained by subtracting the outdoor temperature from the indoor temperature is obtained; according to a preset temperature difference range to which the real-time indoor and outdoor temperature difference belongs, a corresponding operation mode is switched; wherein the operation modes comprise a cold water mode, a mixed mode, a fluorine pump mode and a standby mode, in the cold water mode, a cold water system is started, and a fluorine pump system is closed; in the mixed mode, the cold water system and the fluorine pump system are both started; in the fluorine pump mode, the cold water system is closed, and the fluorine pump system is started; and in the standby mode, the cold water system and the fluorine pump system are both closed. According to the control method, switching control over the operation mode of the refrigerating system is carried out according to the difference value condition of the indoor temperature and the outdoor temperature, so that the operation mode can better meet the indoor refrigerating requirement, and energy consumption is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of data center computer rooms, and in particular to a control method, device, electronic equipment and storage medium for a refrigeration system. Background Art

[0002] The current water-fluorine dual cooling source unit has three main operating modes when performing refrigeration, one is the cold water mode, one is the mixed mode, and the other is the fluorine pump mode.

[0003] In the process of implementing the present invention, the inventors found that the prior art has at least the following problems: when switching the operating mode, it only considers the outdoor temperature but does not consider the actual indoor temperature, which may cause unnecessary energy consumption.

[0004] Therefore, how to improve the energy-saving effect is a technical problem that technical personnel in this field currently need to solve. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a control method, device, electronic equipment and storage medium for a refrigeration system, which can improve energy-saving effects.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A control method for a refrigeration system, the refrigeration system comprising a cold water system and a fluorine pump system as dual cold sources; the control method comprising: obtaining a real-time indoor and outdoor temperature difference obtained by subtracting the indoor temperature from the outdoor temperature; switching a corresponding operation mode according to a preset temperature difference range to which the real-time indoor and outdoor temperature difference belongs; wherein the operation modes comprise a cold water mode, a mixed mode, a fluorine pump mode and a standby mode: in the cold water mode, the cold water system is started and the fluorine pump system is turned off; in the mixed mode, both the cold water system and the fluorine pump system are started; in the fluorine pump mode, the cold water system is turned off and the fluorine pump system is started; in the standby mode, both the cold water system and the fluorine pump system are turned off.

[0008] Preferably, the switching of the corresponding operating mode according to the preset temperature difference range to which the real-time indoor and outdoor temperature difference belongs includes: in the mixed mode, when the real-time indoor and outdoor temperature difference is less than the preset first temperature difference threshold, switching to the cold water mode; in the cold water mode, when the real-time indoor and outdoor temperature difference is greater than the preset second temperature difference threshold, switching to the mixed mode; wherein the preset first temperature difference threshold is less than the preset second temperature difference threshold.

[0009] Preferably, the corresponding operating mode is switched according to the preset temperature difference range to which the real-time indoor and outdoor temperature difference belongs, including: in the fluorine pump mode, when the real-time indoor and outdoor temperature difference is less than the preset third temperature difference threshold, switching to the mixed mode; in the mixed mode, when the real-time indoor and outdoor temperature difference is greater than the preset fourth temperature difference threshold, switching to the fluorine pump mode; wherein the preset third temperature difference threshold is less than the preset fourth temperature difference threshold.

[0010] Preferably, the corresponding operating mode is switched according to the preset temperature difference range to which the real-time indoor and outdoor temperature difference belongs: when the mixed mode is switched to the fluorine pump mode: first keep the cold water system started and control the cold water system to provide the maximum cold water flow, and then switch to the fluorine pump mode after the preset transition conditions are met.

[0011] Preferably, the fluorine pump system includes a second outdoor pipeline, a condenser and a fluorine pump respectively arranged on the second outdoor pipeline, and a condensing fan equipped with the condenser, the second outdoor pipeline is connected to the second indoor pipeline of the indoor unit of the refrigeration system, a refrigeration component is arranged on the second indoor pipeline, and a throttling element is arranged on the second indoor pipeline; when the corresponding operating mode is switched, the corresponding operating mode includes the step of switching the fluorine pump system from off to on, including: controlling the condensing fan to run at the maximum speed limit for a first period of time; then controlling the throttling element to open and maintain it at the maximum opening; after the second period of time, controlling the fluorine pump to open again, and adjusting the frequency of the fluorine pump and / or the operating speed of the condensing fan according to the preset indoor refrigeration demand, and / or the pressure difference before and after the fluorine pump, and / or the overheating of the refrigeration system, and when the frequency of the fluorine pump drops to the preset lower limit frequency, the opening of the throttling element is adjusted according to the overheating of the refrigeration system.

[0012] Preferably, the fluorine pump system includes a second outdoor pipeline, a condenser and a fluorine pump respectively arranged on the second outdoor pipeline, and a condensing fan equipped with the condenser, the second outdoor pipeline is connected to the second indoor pipeline of the indoor unit of the refrigeration system, a refrigeration component is arranged on the second indoor pipeline, and a throttling element is arranged on the second indoor pipeline; when the corresponding operating mode is switched, the corresponding operating mode includes the step of switching the fluorine pump system from off to on, including: first controlling the fluorine pump system to start and keeping the cold water system off at the same time, and then switching the corresponding operating mode after the preset startup time or the real-time cooling demand in the room reaches the hot spot demand.

[0013] Preferably, the switching of the corresponding operating mode according to the preset temperature difference range to which the real-time indoor and outdoor temperature difference belongs includes: in the standby mode: when the real-time indoor and outdoor temperature difference is less than the preset second temperature difference threshold and the refrigeration system has a real-time refrigeration demand, switching to the cold water mode; when the real-time indoor and outdoor temperature difference is greater than the preset second temperature difference threshold and less than the preset fourth temperature difference threshold, and the refrigeration system has a real-time refrigeration demand, switching to the mixed mode; when the real-time indoor and outdoor temperature difference is greater than the preset fourth temperature difference threshold and the refrigeration system has a real-time refrigeration demand, switching to the mixed mode.

[0014] A control device for a refrigeration system, the refrigeration system comprising a cold water system and a fluorine pump system as dual cold sources; the control device comprising: a receiving module for obtaining a real-time indoor and outdoor temperature difference obtained by subtracting the indoor temperature from the outdoor temperature; a control module for switching a corresponding operation mode according to a preset temperature difference range to which the real-time indoor and outdoor temperature difference belongs; wherein the operation modes include a cold water mode, a mixed mode, a fluorine pump mode and a standby mode: in the cold water mode, the cold water system is started and the fluorine pump system is turned off; in the mixed mode, both the cold water system and the fluorine pump system are started; in the fluorine pump mode, the cold water system is turned off and the fluorine pump system is started; in the standby mode, both the cold water system and the fluorine pump system are turned off.

[0015] An electronic device comprises: a memory for storing a computer program; and a processor for implementing the steps of the above control method when executing the computer program.

[0016] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the control method described above are implemented.

[0017] The present invention provides a control method for a refrigeration system, wherein the refrigeration system includes a cold water system and a fluorine pump system as dual cold sources; the control method includes: obtaining a real-time indoor and outdoor temperature difference obtained by subtracting the indoor temperature from the outdoor temperature; switching a corresponding operation mode according to a preset temperature difference range to which the real-time indoor and outdoor temperature difference belongs; wherein the operation modes include a cold water mode, a mixed mode, a fluorine pump mode and a standby mode: in the cold water mode, the cold water system is started and the fluorine pump system is turned off; in the mixed mode, both the cold water system and the fluorine pump system are started; in the fluorine pump mode, the cold water system is turned off and the fluorine pump system is started; in the standby mode, both the cold water system and the fluorine pump system are turned off.

[0018] In this control method, the indoor temperature is introduced, and the operating mode of the refrigeration system is switched based on the difference between the indoor temperature and the outdoor temperature, so that the operating mode can better meet the indoor cooling needs, which is conducive to saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0020] Figure 1 A schematic diagram of a refrigeration system corresponding to a specific embodiment 1 of the control method provided by the present invention;

[0021] Figure 2 A schematic diagram of a water-fluorine double coil in a refrigeration system corresponding to a specific embodiment 1 of the control method provided by the present invention;

[0022] Figure 3 A schematic diagram of the relationship between the operating mode and the temperature difference in a specific embodiment 1 of the control method provided by the present invention;

[0023] Figure 4 A schematic diagram of operating mode switching in a specific embodiment 1 of the control method provided by the present invention;

[0024] Figure 5 This is a flow chart of a specific embodiment 1 of the control method provided by the present invention.

[0025] Reference numerals:

[0026] Indoor unit 1, water-fluorine double coil 11, water coil 111, fluorine coil 112, coil fan 113, throttling element 12, first electronic expansion valve 121, second electronic expansion valve 122, first indoor pipeline 13, flow switch 131, second fluorine injection nozzle 132, water inlet pressure sensor 133, water inlet temperature sensor 134, water outlet pressure sensor 135, water outlet temperature sensor 136, drain valve 137, electric two-way valve 138, second indoor pipeline 14, fourth ball valve 141, drying filter 142, first fluorine injection nozzle 143, low pressure sensor 144, temperature sensor 145;

[0027] Cold water system 2, first ball valve 21, first outdoor pipeline 22;

[0028] Fluorine pump system 3, condenser 31, expansion tank 32, fluorine pump 33, high-pressure pressure sensor 34, first pump pressure inlet sensor 35, second pump outlet pressure sensor 36, second ball valve 37, second outdoor pipeline 38. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The core of the present invention is to provide a control method, device, electronic equipment and storage medium for a refrigeration system, which can improve the energy-saving effect.

[0031] The control method of the refrigeration system provided by the present invention is applied to the refrigeration system. Figure 1 and Figure 2 As shown, this refrigeration system includes an indoor unit 1 and two outdoor units. The two outdoor units form a dual cold source and can operate independently to provide cold capacity for the indoor unit 1 individually or together.

[0032] The indoor unit 1 is an air conditioning unit that is internally configured with two sets of surface coolers with the same or similar structures of coils, and the airflow of the coil fan 113 equipped with the surface cooler passes through the two sets of coils in sequence, with the surface cooler and the coil fan 113 serving as the refrigeration components of the indoor unit 1. Among them, the two sets of coils are respectively a water coil 111 cooled by an external low-temperature water source and a fluorine coil 112 cooled by a natural cold source, forming a water-fluorine double coil 11, corresponding to two relatively independent refrigeration cycles, and connected to two outdoor units respectively. Specifically, the two sets of coils are a front-to-back stacked structure, the first set of coils through which the airflow passes in sequence is the water coil 111, and the second set of coils is the coil.

[0033] One of the outdoor units is a cold water system 2, which is connected to the water coil 111 through the first outdoor pipeline 22. The water supply of the first outdoor pipeline 22 uses chilled water from a cooling tower cooling plate heat exchanger as a cold source or directly connects to the cooling water of the cooling tower. The first outdoor pipeline 22 is provided with a first ball valve 21 and other structures. In the indoor unit 1, the water coil 111 is provided on the first indoor pipeline 13, and the two ends of the first indoor pipeline 13 are connected to the two ends of the first outdoor pipeline 22 to form a first loop. The first indoor pipeline 13 is also provided with a flow switch 131, a second fluorine injection nozzle 132, an inlet water pressure sensor 133, an inlet water temperature sensor 134, an outlet water pressure sensor 135, an outlet water temperature sensor 136, a drain valve 137, and an electric two-way valve 138. Among them, the second fluorine injection nozzle 132 is for pressure maintenance testing, and during use, the first loop is cooling water or chilled water.

[0034] When the cold water system 2 is in operation, it is usually when the indoor temperature Tn and the outdoor temperature Tw are not very large, such as when it is not winter. At this time, the cold water system 2 is in operation, and the cooling water or the freezing water in the first outdoor pipeline 22 enters the water coil 111 of the indoor unit 1, absorbs heat at the water coil 111, and realizes cooling.

[0035] Another outdoor unit is a fluorine pump system 3, which is connected to the fluorine coil 112 through a second outdoor pipeline 38. The second outdoor pipeline 38 is provided with a condenser 31, an expansion tank 32, and a fluorine pump 33 in sequence. The condenser 31 is equipped with a condensing fan. The second outdoor pipeline 38 is also provided with a high-pressure pressure sensor 34, a second ball valve 37, a first pump pressure inlet sensor 35 provided on both sides of the fluorine pump 33, a second pump pressure outlet sensor 36 and other detection or control components as needed. In the indoor unit 1, the fluorine coil 112 is provided on the second indoor pipeline 14, and the two ends of the second indoor pipeline 14 are connected to the two ends of the second outdoor pipeline 38 to form a second loop. The second indoor pipeline 14 is also provided with a throttling element 12, specifically, the throttling element 12 includes a first electronic expansion valve 121 and a second electronic expansion valve 122 connected in parallel. In addition, the second indoor pipeline 14 is also provided with a fourth ball valve 141, a drying filter 142, a first fluorine injection nozzle 143, a low-pressure pressure sensor 144, and a temperature sensor 145 as needed.

[0036] When the fluorine pump system 3 is running, it is usually when the outdoor temperature Tw is low enough, the difference with the indoor temperature Tn is large, and the outdoor air has a certain degree of cooling capacity, such as in winter. The refrigerant in the second loop can be cooled into liquid outdoors, and after being pressurized by the fluorine pump 33, the refrigerant is transported to the fluorine coil 112 of the indoor unit 1 for evaporation, thereby achieving refrigeration, that is, natural cooling. Compared with the cold water system 2, refrigeration using the fluorine pump 33 is more energy-efficient.

[0037] In the specific embodiment 1 of the control method of the refrigeration system provided by the present invention, please refer to Figures 3 to 5 , including the following steps:

[0038] S1: Obtain the real-time indoor and outdoor temperature difference t obtained by subtracting the indoor temperature Tn from the outdoor temperature Tw.

[0039] The indoor temperature Tn and the outdoor temperature Tw are both real-time temperatures. The indoor temperature Tn can be the indoor return air temperature of the indoor unit 1, that is, the temperature of the return air outlet of the indoor unit 1. The indoor return air temperature can usually reflect the indoor temperature Tn more accurately.

[0040] S2: Switch to a corresponding operation mode according to the preset temperature difference range to which the real-time indoor and outdoor temperature difference t belongs.

[0041] The operation modes include cold water mode CW, mixed mode CW+IF, fluorine pump mode IF and standby mode:

[0042] In the cold water mode CW, the cold water system 2 is started and the fluorine pump system 3 is shut down;

[0043] In the mixed mode CW+IF, both the cold water system 2 and the fluorine pump system 3 are started;

[0044] In the fluorine pump mode IF, the cold water system 2 is turned off and the fluorine pump system 3 is started;

[0045] In the standby mode, both the cold water system 2 and the fluorine pump system 3 are turned off.

[0046] In this control method, the indoor temperature Tn is introduced, and the operating mode of the refrigeration system is switched based on the difference between the indoor temperature Tn and the outdoor temperature Tw, so that the operating mode can better meet the indoor refrigeration needs, which is conducive to saving energy consumption.

[0047] Typically, the refrigeration capacities of the cold water mode CW, the mixed mode CW+IF, and the fluorine pump mode IF gradually decrease, and the corresponding preset temperature difference ranges gradually increase; alternatively, there may be other relationships between different preset temperature difference ranges, such as partial overlap.

[0048] In S2, when switching some operating modes, the real-time cooling demand must also be considered. The real-time cooling demand specifically refers to the cooling required for the indoor temperature Tn to reach the set indoor target temperature, which can be obtained according to a preset algorithm, wherein the target temperature is the preset temperature required to be reached indoors. In addition, the cooling capacity that can be provided to the room within a set time under different operating parameters of the cold water system 2 and the fluorine pump system 3 under different operating parameters can also be obtained in advance, which is called cooling capacity. Therefore, by comparison, it can be determined whether the cooling capacity provided under various operating modes can meet the real-time cooling demand.

[0049] Within the set time, if a certain operation mode maintains the set parameters (for example, the equipment on the pipeline uses the maximum power, and the valve on the pipeline uses the maximum opening), it can provide a cooling capacity that is not less than the current real-time cooling demand, so that the indoor temperature Tn does not exceed the target temperature. This operation mode is considered to be able to meet the real-time cooling demand in the room. In addition, when setting the preset temperature difference range for switching the operation mode, the cooling capacity of different operation modes should be considered to ensure that the range of its cooling capacity can cover the indoor cooling demand within a certain range.

[0050] Specifically, when the operation mode of other cold water system 2 is switched to the operation mode of cold water system 2 starting (mixed mode CW+IF, cold water mode CW), the cold water system 2 can usually meet the real-time cooling demand due to its strong cooling capacity. When other operation modes are switched to fluorine pump mode IF, that is, when the corresponding temperature difference conditions are met, since the cooling capacity of fluorine pump mode IF is greatly constrained by the environment, it may be necessary to consider and judge the size of the real-time cooling demand and the cooling capacity of the operation mode, and then decide the timing of the operation mode switching or whether to switch the operation mode.

[0051] In S2, if Figure 3 As shown, between mixed mode CW+IF and cold water mode CW:

[0052] In the mixed mode CW+IF, when the real-time indoor and outdoor temperature difference t is less than the preset first temperature difference threshold T1, it switches to the cold water mode CW;

[0053] In the cold water mode CW, when the real-time indoor and outdoor temperature difference t is greater than the preset second temperature difference threshold T2, it switches to the mixed mode CW+IF;

[0054] Among them, the preset first temperature difference threshold value T1 is less than the preset second temperature difference threshold value T2. Specifically, the preset first temperature difference threshold value T1=the preset second temperature difference threshold value-the first hysteresis. When setting, the preset second temperature difference threshold value T2 and the first hysteresis can be set and adjusted as needed to obtain the preset first temperature difference threshold value T1. Of course, in other embodiments, the preset first temperature difference threshold value T1 and the preset second temperature difference threshold value T2 can also be directly set separately, and adjusted according to actual needs.

[0055] Among them, in the process of switching from the mixed mode CW+IF to the cold water mode CW: when operating in the mixed mode CW+IF, when the real-time indoor and outdoor temperature difference t meets the corresponding switching condition or the fluorine pump system 3 is unable to operate due to other reasons, the mixed mode CW+IF is switched to the cold water mode CW, and the action performed by the refrigeration system is to directly shut down the fluorine pump 33.

[0056] Among them, in the process of switching from the cold water mode CW to the mixed mode CW+IF: when operating in the cold water mode CW, when the real-time indoor and outdoor temperature difference t meets the corresponding switching condition, the cold water mode CW will be switched to the mixed mode CW+IF.

[0057] Among them, since the cold water system 2 is started in the cold water mode CW and the mixed mode CW+IF, the cold water system 2 can freely adjust its cooling capacity according to the real-time cooling demand in the room, that is, control the flow rate or temperature of the provided cold water (cooling water or chilled water).

[0058] Based on the above switching method, the mutual switching between the mixed mode CW+IF and the cold water mode CW has different thresholds. At this time, there is a certain overlapping temperature difference range between the mixed mode CW+IF and the cold water mode CW. According to the different switching directions, when the preset first temperature difference threshold T1 and the preset second temperature difference threshold T2 are between, the original operating mode in the mixed mode CW+IF and the cold water mode CW is maintained, which can effectively avoid frequent switching of the operating mode and extend the service life of the equipment.

[0059] It should be noted that when the real-time indoor and outdoor temperature difference t is equal to the preset first temperature difference threshold T1, the preset second temperature difference threshold T2, the preset third temperature difference threshold T3, and the preset fourth temperature difference threshold T4, it can be set to switch the operating mode, or not to switch the operating mode.

[0060] Of course, in other embodiments, the preset second temperature difference threshold T2 and the preset fourth temperature difference threshold T4 can be directly used as thresholds for switching. The three temperature difference ranges from small to large divided by the preset second temperature difference threshold T2 and the preset fourth temperature difference threshold T4 correspond to switching to the cold water mode CW, the mixed mode CW+IF, and the fluorine pump mode IF respectively.

[0061] In S2, if Figure 3 As shown, between the mixed mode CW+IF and the fluorine pump mode IF:

[0062] In the fluorine pump mode IF, when the real-time indoor and outdoor temperature difference t is less than the preset third temperature difference threshold T3, it switches to the mixed mode CW+IF;

[0063] In the mixed mode CW+IF, when the real-time indoor and outdoor temperature difference t is greater than the preset fourth temperature difference threshold T4, it switches to the fluorine pump mode IF;

[0064] Among them, the preset third temperature difference threshold value T3 is less than the preset fourth temperature difference threshold value T4. Specifically, the preset third temperature difference threshold value T3=the preset fourth temperature difference threshold value T4-the second hysteresis. When setting, the preset fourth temperature difference threshold value T4 and the second hysteresis can be set and adjusted as needed to obtain the preset third temperature difference threshold value T3. In addition, the first hysteresis and the second hysteresis can be the same or different. Of course, in other embodiments, the preset third temperature difference threshold value T3 can also be directly set to be less than the preset fourth temperature difference threshold value T4, and adjusted according to actual needs.

[0065] Among them, in the process of switching from the fluorine pump mode IF to the mixed mode CW+IF: when operating in the fluorine pump mode IF, when the real-time indoor and outdoor temperature difference t meets the corresponding switching condition, the fluorine pump mode IF will be switched to the mixed mode CW+IF, and the execution action is to directly turn on the cold water system 2 for refrigeration compensation.

[0066] Based on the above switching method, it can be known that the switching between the mixed mode CW+IF and the fluorine pump mode IF has different thresholds. At this time, the mixed mode CW+IF has a certain overlapping temperature difference range with the fluorine pump mode IF. According to the different switching directions, the mixed mode CW+IF or the fluorine pump mode IF may exist between the preset third temperature difference threshold T3 and the preset fourth temperature difference threshold T4. In this way, the frequent switching of the operating mode can be effectively avoided, and the service life of the equipment can be extended.

[0067] In addition, considering that the refrigeration capacity of the fluorine pump mode IF may not meet the real-time refrigeration needs, when switching from other operating modes to the fluorine pump mode IF, the operation of the cold water system 2 or the fluorine pump system 3 after startup can be further limited.

[0068] Specifically, in S2, when the mixed mode CW+IF is switched to the fluorine pump mode IF:

[0069] First, the cold water system 2 is started and controlled to provide the maximum cold water flow, and then switched to the fluorine pump mode IF after the preset transition condition is met. For example, the preset transition condition may be that the real-time cooling demand is reduced to a preset value, or the target temperature is reduced to a preset value.

[0070] During this switching process, even if the corresponding temperature difference condition is met, the cold water system 2 is kept started for a period of time, and then the cold water system 2 is turned off to enter the fluorine pump mode IF. This operation can ensure that the real-time cooling demand is lowered before the operation mode is switched, specifically, it can be lowered to below the start point of the fluorine pump mode IF, thereby reducing the indoor temperature Tn in advance, avoiding the refrigeration capacity not being utilized when switching to the fluorine pump system 3 running alone, resulting in a large increase in the indoor temperature Tn.

[0071] In addition, in S2, when switching the corresponding operation mode, including the step of switching from the closed fluorine pump system 3 to the fluorine pump system 3 starting, for example, switching from the standby mode, the cold water mode CW to the mixed mode CW+IF, the fluorine pump mode IF, including:

[0072] S201: Control the condensing fan to run at the maximum speed limit for a first period of time, and then enter S202.

[0073] S202: Control the throttling element 12 to open and maintain the maximum opening, and after the second time period, enter S203.

[0074] The throttling element specifically includes an electronic expansion valve in the indoor unit 1, such as Figure 1As shown, more specifically, the first electronic expansion valve 121 and the second electronic expansion valve 122 are connected in parallel. In other embodiments, it can also be an energy-saving tube. The throttling element is opened to the maximum opening, specifically, the first electronic expansion valve 121 and the second electronic expansion valve 122 are both opened to the maximum valve step, for example, 480 steps, wherein the maximum valve step can be set as needed. In addition, in order to avoid the fluorine pump 33 having too small a flow rate, the throttling element is provided with a preset lower limit opening, thereby avoiding cavitation caused by low flow rate.

[0075] S203: Control the fluorine pump 33 to start, adjust the frequency of the fluorine pump 33 and / or the operating speed of the condensing fan, and when the frequency of the fluorine pump 33 drops to a preset lower limit frequency, adjust the opening of the throttling element 12 according to the superheat condition of the refrigeration system.

[0076] When adjusting the frequency of the fluorine pump 33, the frequency can be adjusted according to the preset indoor refrigeration demand, and / or the pressure difference before and after the fluorine pump 33, and / or the superheat of the refrigeration system. When adjusting the running speed of the condensing fan, the frequency can be adjusted according to the preset indoor refrigeration demand, and / or the evaporation pressure (specifically, the outlet pressure of the fluorine coil 112, such as the detection value of the low-pressure pressure sensor 144) . Specifically, the greater the refrigeration demand, the greater the speed of the condensing fan, which can provide a lower temperature refrigerant to the indoor side for heat exchange and provide a larger cooling capacity. The smaller the refrigeration demand, the lower the speed of the condensing fan, thereby reducing the energy consumption of the condensing fan.

[0077] The front-rear pressure difference of the fluorine pump 33 can be detected by a first pump pressure inlet sensor 35 and a second pump outlet pressure sensor 36 located on both sides of the fluorine pump 33 on the second outdoor pipeline 38 .

[0078] Among them, for the control of the condensing fan, it is maintained at the maximum speed limit before the fluorine pump 33 is turned on, and is not limited by the operating speed control method during normal adjustment. When the fluorine pump 33 is turned on and the front and rear pressure difference is greater than the preset pressure difference, it is considered that a qualified front and rear pressure difference of the fluorine pump 33 is established, wherein the preset pressure difference can be determined in combination with the flow change of the fluorine pump 33. After that, the condensing fan can automatically adjust the operating speed according to the real-time refrigeration demand and the liquid pipe temperature of the condenser 31. When the operating speed of the condensing fan is adjusted, the rate of change is maintained at 1% / 10s to avoid cavitation of the fluorine pump 33 due to too fast adjustment.

[0079] Among them, after the frequency of the fluorine pump 33 drops to the preset lower limit frequency, the opening of the throttling element 12 is adjusted according to the superheat of the refrigeration system. Specifically, after the superheat is lower than the target superheat, the valve step of the electronic expansion valve is reduced.

[0080] Based on this control method of the fluorine pump 33, the cooling capacity that the fluorine pump system 3 can provide is adjusted by first changing the frequency of the fluorine pump 33, and then the cooling capacity that the fluorine pump system 3 can provide is adjusted by adjusting the opening of the throttling element. The frequency of the fluorine pump 33 can run in the low frequency band as long as possible, thereby further realizing energy saving.

[0081] In addition, in S2, when switching from standby mode to other operating modes, the three temperature difference ranges from small to large divided by the preset second temperature difference threshold T2 and the preset fourth temperature difference threshold T4 can be directly used as switching conditions, which correspond to switching to cold water mode CW, mixed mode CW+IF, and fluorine pump mode IF in turn.

[0082] Specifically, refer to Figure 3 , in standby mode:

[0083] When the real-time indoor and outdoor temperature difference t is less than the preset second temperature difference threshold T2, and the refrigeration system has a real-time refrigeration demand, it switches to the cold water mode CW;

[0084] When the real-time indoor and outdoor temperature difference t is greater than the preset second temperature difference threshold T2 and less than the preset fourth temperature difference threshold T4, and the refrigeration system has a real-time refrigeration demand, it switches to the mixed mode CW+IF;

[0085] When the real-time indoor and outdoor temperature difference t is greater than the preset fourth temperature difference threshold T4, and the refrigeration system has a real-time refrigeration demand, it switches to the mixed mode CW+IF.

[0086] Among them, the refrigeration system has a real-time refrigeration demand, which specifically refers to the refrigeration system receiving a refrigeration instruction and needing to enter a refrigeration state, such as receiving a refrigeration system power-on instruction, or currently changing from having no real-time refrigeration demand to having a real-time refrigeration demand, such as changing from a target temperature not lower than the indoor temperature Tn to lower than the indoor temperature Tn.

[0087] It should be noted that when switching from the standby mode to the fluorine pump mode IF, the fluorine pump system 3 is switched from being turned off to being turned on, specifically including:

[0088] S211: First control the fluorine pump system 3 to start and keep the cold water system 2 closed. After the preset startup time or the real-time cooling demand in the room reaches the hot spot demand, switch to the fluorine pump mode IF.

[0089] At this time, the startup time of the fluorine pump system 3 has not reached the preset startup time, and the real-time refrigeration demand has not reached the hot spot demand, so the cold water system 2 is prohibited from running to avoid the refrigeration system switching to the operation mode of starting the cold water system 2 before the refrigeration capacity of the fluorine pump system 3 is exerted.

[0090] The hot spot demand can be determined after the fluorine pump system 3 has been running for a period of time. Indoor in this embodiment usually refers to a data center or a computer room, and the hot spot demand can be the cooling required to keep the local high temperature area formed by uneven heat distribution at a safe temperature.

[0091] Of course, in addition to the case of switching from the standby mode to the fluorine pump mode IF, when the fluorine pump system 3 is turned off in other operating modes and then entered into the operating mode of starting the fluorine pump system 3, the fluorine pump system 3 can also be started and run for a period of time according to the above step S211, and then enter S2, for example, when switching from the standby mode to the mixed mode CW+IF. However, in the latter case, in actual applications, the fluorine pump system 3 and the cold water system 2 are usually started at the same time.

[0092] In addition, when other operating modes are switched to the standby mode, the refrigeration system usually receives an instruction to stop refrigeration, or currently has no real-time refrigeration demand.

[0093] Among them, when a stop cooling instruction is received, the stop cooling instruction can be a mandatory instruction received manually or input by emergency equipment, or it is automatically generated when the indoor temperature Tn reaches the target temperature, and the operating mode can be directly switched to the standby mode.

[0094] Specifically, the process of converting from other operating modes to standby mode includes:

[0095] In the cold water mode CW, when the real-time indoor temperature difference is less than the preset second temperature difference threshold, and there is no real-time cooling demand, and accordingly there is no demand for the cold water system 2 to be turned on, it will switch to standby mode;

[0096] In the mixed mode, when there is no real-time cooling demand, and accordingly there is no demand to start the cold water system 2 and the fluorine pump system 3, it will switch to the standby mode;

[0097] In the fluorine pump mode IF, when there is no real-time cooling demand, and accordingly no demand to start the cold water system 2 and the fluorine pump system 3, the system will switch to the standby mode, at which the fluorine pump 33, the throttling element 12 and the condensing fan are turned off.

[0098] Alternatively, when applying this refrigeration system, the above control method may not be used, and the operation mode may be manually switched. For example, in the summer when the outdoor temperature is relatively high, the cold water mode is used, and in the spring and autumn transition seasons, the mixed mode can be directly used to reduce the opening of the host of the cold water system and reduce the overall power consumption. In winter, when the outdoor temperature Tw is relatively low, the cold water system is turned off, and the fluorine pump mode is directly used to reduce the operation of the cooling tower and water pump of the cold water system, further reduce energy consumption, and achieve high efficiency and energy saving.

[0099] In addition to the above control method, the present invention also provides a control device for a refrigeration system, the control device for the refrigeration system comprising:

[0100] A receiving module is used to obtain the real-time indoor and outdoor temperature difference t obtained by subtracting the indoor temperature Tn from the outdoor temperature Tw;

[0101] A control module, used to switch the corresponding operation mode according to the preset temperature difference range to which the real-time indoor and outdoor temperature difference t belongs;

[0102] The operation modes include cold water mode CW, mixed mode CW+IF, fluorine pump mode IF and standby mode:

[0103] In the cold water mode CW, the cold water system 2 is started and the fluorine pump system 3 is shut down;

[0104] In the mixed mode CW+IF, both the cold water system 2 and the fluorine pump system 3 are started;

[0105] In the fluorine pump mode IF, the cold water system 2 is turned off and the fluorine pump system 3 is started;

[0106] In the standby mode, both the cold water system 2 and the fluorine pump system 3 are turned off.

[0107] The control device mentioned above is described from the perspective of functional modules. Furthermore, the present invention also provides an electronic device, which is described from the perspective of hardware. The electronic device includes:

[0108] Memory for storing computer programs;

[0109] The processor is used to implement the steps of the sled braking control method of the maglev train in the above embodiment when executing the computer program.

[0110] The electronic device provided in this embodiment may include but is not limited to a smart phone, a tablet computer, a laptop computer or a desktop computer.

[0111] Based on this, an embodiment of the present invention further 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 above control method are implemented.

[0112] It should be noted that when an element is referred to as "fixed" to another element, it may be directly on the other element or there may be an element in the middle. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an element in the middle. In addition, in the description of the present invention, unless otherwise specified, "multiple", "multiple roots", "multiple groups" mean two or more.

[0113] The terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0114] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0115] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0116] The control method, device, electronic device and storage medium of the refrigeration system provided by the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A control method for a refrigeration system, characterized in that: The refrigeration system comprises a cold water system (2) and a fluorine pump system (3); The control method comprises: Get the real-time indoor and outdoor temperature difference obtained by subtracting the indoor temperature from the outdoor temperature; Switching the corresponding operation mode according to the preset temperature difference range to which the real-time indoor and outdoor temperature difference belongs; The operation modes include cold water mode, mixed mode, fluorine pump mode and standby mode: In the cold water mode, the cold water system (2) is started and the fluorine pump system (3) is turned off; In the mixed mode, both the cold water system (2) and the fluorine pump system (3) are started; In the fluorine pump mode, the cold water system (2) is turned off and the fluorine pump system (3) is started; In the standby mode, the cold water system (2) and the fluorine pump system (3) are both turned off.

2. The control method according to claim 1, characterized in that: The switching of the corresponding operation mode according to the preset temperature difference range to which the real-time indoor and outdoor temperature difference belongs includes: In the mixed mode, when the real-time indoor and outdoor temperature difference is less than a preset first temperature difference threshold, switch to the cold water mode; In the cold water mode, when the real-time indoor and outdoor temperature difference is greater than a preset second temperature difference threshold, switching to the mixed mode; Wherein, the preset first temperature difference threshold is smaller than the preset second temperature difference threshold.

3. The control method according to claim 1, characterized in that: The switching of the corresponding operation mode according to the preset temperature difference range to which the real-time indoor and outdoor temperature difference belongs includes: In the fluorine pump mode, when the real-time indoor and outdoor temperature difference is less than a preset third temperature difference threshold, switching to the mixed mode; In the mixed mode, when the real-time indoor and outdoor temperature difference is greater than a preset fourth temperature difference threshold, switching to the fluorine pump mode; Wherein, the preset third temperature difference threshold is smaller than the preset fourth temperature difference threshold.

4. The control method according to claim 1, characterized in that: According to the preset temperature difference range to which the real-time indoor and outdoor temperature difference belongs, switching the corresponding operation mode: When the mixed mode is switched to the fluorine pump mode: First, the cold water system (2) is started and controlled to provide a maximum cold water flow rate, and then, after a preset transition condition is met, the mode is switched to the fluorine pump mode.

5. The control method according to claim 1, characterized in that: The fluorine pump system (3) comprises a second outdoor pipeline (38), a condenser (31) and a fluorine pump (33) respectively arranged on the second outdoor pipeline (38), and a condensing fan equipped with the condenser (31); the second outdoor pipeline (38) is connected to a second indoor pipeline (14) of an indoor unit (1) of the refrigeration system; a refrigeration component is arranged on the second indoor pipeline (14); and a throttling element (12) is arranged on the second indoor pipeline (14); When the corresponding operation mode is switched, the corresponding operation mode includes a step of switching the fluorine pump system (3) from being turned off to being turned on, comprising: Controlling the condensing fan to operate at a maximum speed limit for a first period of time; Then controlling the throttling element (12) to open and maintain a maximum opening; After the second time period, the fluorine pump (33) is controlled to start again, and the frequency of the fluorine pump (33) and / or the operating speed of the condensing fan are adjusted according to the preset indoor cooling demand, and / or the pressure difference before and after the fluorine pump (33), and / or the superheat condition of the refrigeration system. When the frequency of the fluorine pump (33) drops to a preset lower limit frequency, the opening of the throttling element (12) is adjusted according to the superheat condition of the refrigeration system.

6. The control method according to claim 1, characterized in that: The fluorine pump system (3) comprises a second outdoor pipeline (38), a condenser (31) and a fluorine pump (33) respectively arranged on the second outdoor pipeline (38), and a condensing fan equipped with the condenser (31); the second outdoor pipeline (38) is connected to a second indoor pipeline (14) of an indoor unit (1) of the refrigeration system; a refrigeration component is arranged on the second indoor pipeline (14); and a throttling element (12) is arranged on the second indoor pipeline (14); When the corresponding operation mode is switched, the corresponding operation mode includes a step of switching the fluorine pump system (3) from being turned off to being turned on, comprising: First, the fluorine pump system (3) is controlled to start, while keeping the cold water system (2) closed. After a preset start-up time or when the real-time cooling demand in the room reaches the hotspot demand, the corresponding operation mode is switched.

7. The control method according to claim 1, characterized in that: The switching of the corresponding operation mode according to the preset temperature difference range to which the real-time indoor and outdoor temperature difference belongs includes: In the described standby mode: When the real-time indoor and outdoor temperature difference is less than a preset second temperature difference threshold and the refrigeration system has a real-time refrigeration demand, switching to the cold water mode; When the real-time indoor and outdoor temperature difference is greater than the preset second temperature difference threshold and less than the preset fourth temperature difference threshold, and the refrigeration system has a real-time refrigeration demand, switching to the mixed mode; When the real-time indoor and outdoor temperature difference is greater than the preset fourth temperature difference threshold and the refrigeration system has a real-time refrigeration demand, it switches to the mixed mode.

8. A control device for a refrigeration system, characterized in that: The refrigeration system comprises a cold water system (2) and a fluorine pump system (3); The control device comprises: A receiving module is used to obtain the real-time indoor and outdoor temperature difference obtained by subtracting the indoor temperature from the outdoor temperature; A control module, used for switching a corresponding operation mode according to a preset temperature difference range to which the real-time indoor and outdoor temperature difference belongs; The operation modes include cold water mode, mixed mode, fluorine pump mode and standby mode: In the cold water mode, the cold water system (2) is started and the fluorine pump system (3) is turned off; In the mixed mode, both the cold water system (2) and the fluorine pump system (3) are started; In the fluorine pump mode, the cold water system (2) is turned off and the fluorine pump system (3) is started; In the standby mode, the cold water system (2) and the fluorine pump system (3) are both turned off.

9. An electronic device, characterized in that: include: Memory for storing computer programs; A processor, configured to implement the steps of the control method according to any one of claims 1 to 7 when executing the computer program.

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 control method according to any one of claims 1 to 7 are implemented.

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