Refrigeration system, control method of refrigeration system, control device and air conditioner

Abstract

The present invention provides a refrigeration system, a control method for a refrigeration system, a control device, and an air conditioner, relating to the technical field of air conditioning. The refrigeration system includes a chiller, an air-cooled heat exchanger, and a coolant circulation pipeline that passes through the terminal of the air conditioning equipment and cools it. The air-cooled heat exchanger and the chiller are arranged in series, both for cooling the coolant. A bypass flow path is arranged in parallel with the air-cooled heat exchanger, and the flow paths of the air-cooled heat exchanger and the chiller, as well as the bypass flow path, are both connected and blocked to the coolant circulation pipeline. This solves the technical problem that the refrigeration system has difficulty meeting the refrigeration requirements of the air conditioning terminal equipment when the outdoor ambient temperature is too high or too low. Even when the outdoor ambient temperature is too high or too low, the refrigeration requirements of the air conditioning terminal equipment can still be met, ensuring the reliability of the refrigeration capacity of the refrigeration system.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a refrigeration system, a control method and a control device of the refrigeration system, and an air conditioner. Background Art

[0002] Currently, many occasions require cooling throughout the year, such as computer rooms, base stations and other places, which require the use of air conditioning systems.

[0003] Existing methods for cooling air conditioning equipment terminal devices include air-cooled circulating coolant refrigeration and water chiller refrigeration. A water chiller consists of a compressor, an evaporator, and a condenser, through which refrigerant circulates. The refrigerant is compressed in the compressor to form a high-temperature, high-pressure gas. After condensing in the condenser, it evaporates in the evaporator, absorbing heat and cooling the coolant inside the evaporator.

[0004] The applicant has discovered that the prior art has at least the following technical problems:

[0005] Existing technologies rely solely on air-cooled circulating coolant. When the ambient temperature is too high, such as above 60°C, the coolant temperature after heat dissipation and cooling will be too high, failing to meet the cooling requirements of the air conditioning equipment. Using a water chiller alone for cooling, when the ambient temperature is too low, such as below -45°C, the compressor's compression ratio will be too low, and the lubricating oil will solidify or become too viscous, preventing the compressor from starting properly. Consequently, existing air conditioning systems struggle to meet cooling requirements in both high and low outdoor temperatures. Summary of the Invention

[0006] The object of the present invention is to provide a refrigeration system, a control method for a refrigeration system, a control device and an air conditioner to solve the technical problem in the prior art that the existing air-conditioning system is difficult to meet the refrigeration requirements of the air-conditioning terminal equipment when the outdoor ambient temperature is too high or too low; the many technical effects that can be produced by the preferred technical solution among the many technical solutions provided by the present invention are detailed below.

[0007] To achieve the above objectives, the present invention provides the following technical solutions:

[0008] The present invention provides a refrigeration system comprising a chiller, an air-cooled heat exchanger, and a coolant circulation pipeline passing through the end of the air-conditioning equipment and cooling the air-conditioning equipment, wherein:

[0009] The air-cooled heat exchanger and the chiller are arranged in series, and both are used to cool the coolant; there is a bypass flow path arranged in parallel with the air-cooled heat exchanger, and there are conductive states and blocked states between the flow path where the air-cooled heat exchanger and the chiller are located and the bypass flow path and the coolant circulation pipeline.

[0010] Preferably, a first valve body is provided on the flow path where the air-cooled heat exchanger and the chiller are located, and the first valve body is used to control the flow path where the air-cooled heat exchanger and the chiller are located and the coolant circulation pipeline to be in the conductive state or the blocked state.

[0011] Preferably, a second valve body is provided on the bypass flow path, and the second valve body is used to control the bypass flow path and the coolant circulation pipeline to be in the conducting state or the blocking state.

[0012] Preferably, the chillers include more than two groups, and all the chillers are arranged in parallel.

[0013] Preferably, there are more than two air-cooled heat exchangers, and all of the air-cooled heat exchangers are arranged in parallel.

[0014] Preferably, the refrigeration system further comprises a fluid replenishing device for replenishing coolant into the system pipeline, and the fluid replenishing device is connected to the main line of the coolant circulation pipeline.

[0015] Preferably, a liquid supply pump body for increasing the pressure of the coolant is provided on the main circuit of the coolant circulation pipeline, and the liquid supply pump body includes one or more than two, and at least two of the liquid supply pump bodies are provided in parallel.

[0016] The present invention also provides a control method applicable to the above refrigeration system, the control method comprising:

[0017] Get the outdoor temperature;

[0018] If the outdoor temperature is greater than or equal to a first preset temperature, controlling the flow path between the air-cooled heat exchanger and the chiller and the coolant circulation pipeline to be in the conductive state;

[0019] If not, the bypass flow path and the coolant circulation pipeline are controlled to be in the blocked state, the flow path where the air-cooled heat exchanger and the chiller are located and the coolant circulation pipeline are controlled to be in the connected state, and all the chillers are controlled to be shut down.

[0020] Preferably, the water chillers include more than two groups, and all the water chillers are arranged in parallel;

[0021] If the outdoor temperature is greater than or equal to a first preset temperature, controlling the flow path between the air-cooled heat exchanger and the chiller and the coolant circulation pipeline to be in the conductive state includes:

[0022] Determine whether all the chillers have faults. If not, control the flow paths where the air-cooled heat exchanger and the chillers are located, the bypass flow path, and the coolant circulation pipeline to be in the conductive state.

[0023] Preferably, it is determined whether all the chillers are faulty. If so, the flow paths between the air-cooled heat exchanger and the chillers and the coolant circulation pipeline are controlled to be in the conductive state, and based on the relationship between the water supply temperature at the end of the air-conditioning equipment and the minimum preset threshold and the maximum preset threshold, the bypass flow path and the coolant circulation pipeline are controlled to be in the conductive state or the blocked state.

[0024] Preferably, the water chillers include more than two groups, and all the water chillers are arranged in parallel;

[0025] The controlling of the bypass flow path and the coolant circulation pipeline to be in the conducting state or the blocking state according to the relationship between the water supply temperature at the end of the air conditioning equipment and the lowest preset threshold value and the highest preset threshold value includes:

[0026] If the water supply temperature at the end of the air conditioning equipment is greater than or equal to a minimum preset threshold and less than or equal to a maximum preset threshold, controlling the bypass flow path and the coolant circulation pipeline to be in the conductive state;

[0027] If not, the bypass flow path and the coolant circulation pipeline are controlled to be in the blocking state, and part or all of the air-cooled heat exchangers are controlled to operate.

[0028] Preferably, the water chillers include more than two groups, and all the water chillers are arranged in parallel;

[0029] The controlling of the bypass flow paths to be in the blocking state with respect to the coolant circulation pipelines and controlling the shutdown of all the chillers includes:

[0030] If the absolute value of the difference between the outdoor temperature and the first preset temperature is less than or equal to the first preset difference, all the air-cooled heat exchangers are controlled to operate;

[0031] If not, the air-cooled heat exchanger described in the control part will start operating.

[0032] Preferably, the control section controls the operation of the air-cooled heat exchanger, including:

[0033] If the absolute value of the difference between the outdoor temperature and the first preset temperature is greater than the first preset difference and less than or equal to the second preset difference, the number of operating operations of the air-cooled heat exchanger is reduced.

[0034] Preferably, if the outdoor temperature is greater than a second preset difference, the number of operating operations of the air-cooled heat exchanger is further reduced.

[0035] The present invention also provides a control device suitable for the above refrigeration system, comprising:

[0036] Detection module, used to obtain outdoor temperature;

[0037] a control module, configured to control the flow path between the air-cooled heat exchanger and the chiller and the coolant circulation pipeline to be in the conductive state when the outdoor temperature is greater than or equal to a first preset temperature;

[0038] It is also used to control the bypass flow path and the coolant circulation pipeline to be in the blocked state when the outdoor temperature is lower than a first preset temperature, control the flow path between the air-cooled heat exchanger and the chiller and the coolant circulation pipeline to be in the connected state, and control all the chillers to shut down.

[0039] The present invention also provides an air conditioner comprising the above refrigeration system.

[0040] The refrigeration system, control method, control device and air conditioner provided by the present invention have the following beneficial effects compared with the prior art: when the outdoor environment is a high temperature environment, that is, the outdoor temperature is greater than or equal to a first preset temperature, the flow path where the air-cooled heat exchanger and the chiller are located and the cooling liquid circulation pipeline are in a conductive state. In this way, even if the cooling liquid is difficult to cool down due to the high outdoor temperature, the refrigeration system can use the refrigerant circulating in the chiller to cool down; when the outdoor environment is a low temperature environment, that is, the outdoor temperature is less than the first preset temperature, the bypass flow path is controlled to be in the said blocking state, the flow path where the air-cooled heat exchanger and the chiller are located is controlled to be in the said conductive state, and all chillers are controlled to be shut down, so that the cooling liquid can be used to directly exchange heat with the outdoor environment, and the cooled cooling liquid can cool the terminal of the air-conditioning equipment, thereby preventing the terminal of the air-conditioning equipment from being unable to cool down due to the compressor in the chiller being unable to start in a low temperature environment.

[0041] The above-mentioned refrigeration system, control method, control device and air conditioner can still meet the refrigeration requirements of the air-conditioning terminal equipment when the outdoor ambient temperature is too high or too low, thereby ensuring the reliability of the refrigeration capacity of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0043] Figure 1 This is a schematic diagram of the flow of refrigerant and coolant when the flow paths and bypass flow paths of the air-cooled heat exchanger and chiller of the present invention are in a conductive state with the coolant circulation pipeline;

[0044] Figure 2 This is a schematic diagram of the coolant flow when all chillers are shut down, with the flow paths of the air-cooled heat exchanger and chiller connected to the coolant circulation pipeline and the bypass flow path blocked from the coolant circulation pipeline;

[0045] Figure 3 This is a schematic diagram of the coolant flow when the flow paths of the air-cooled heat exchanger and the chiller are connected to the coolant circulation pipeline, the bypass flow path is blocked from the coolant circulation pipeline, and some or all of the air-cooled heat exchangers are turned on and running;

[0046] Figure 4 It is a flow chart of the control method of the refrigeration system of the present invention;

[0047] Figure 5 It is a principle block diagram of the control device of the refrigeration system of the present invention.

[0048] In the figure, 100 is the terminal of the air-conditioning equipment; 200 is the remaining branches of the chiller; 300 is the remaining branches of the air-cooled heat exchanger; 400 is the control device; 401 is the detection module; 402 is the control module; 1 is the air-cooled heat exchanger; 21 is the compressor; 22 is the condenser; 23 is the evaporator; 24 is the expansion valve; 25 is the first temperature sensor; 16 is the fan; 3 is the first valve body; 4 is the second valve body; 5 is the second temperature sensor; 6 is the liquid replenishing tank; 7 is the pressure pump; 8 is the liquid supply pump body; 9 is the check valve. DETAILED DESCRIPTION

[0049] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0050] In the description of the present invention, it should be understood that the terms "center," "length," "width," "height," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," and "side" and the like, indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0051] Embodiments of the present invention provide a refrigeration system, a control method for the refrigeration system, a control device, and an air conditioner, which can still meet the refrigeration requirements of air-conditioning terminal equipment when the outdoor ambient temperature is too high or too low.

[0052] The following combination Figure 1-Figure 5 The technical solution provided by the present invention is described in more detail.

[0053] Example 1

[0054] like Figure 1 、 Figure 2 As shown, Figure 1 The direction of the solid arrow indicates the flow of the coolant, and the direction of the hollow arrow indicates the flow of the refrigerant. This embodiment provides a refrigeration system, including a chiller, an air-cooled heat exchanger, and a coolant circulation pipeline that passes through the terminal of the air-conditioning equipment and cools it. The air-cooled heat exchanger and the chiller are arranged in series, both for cooling the coolant; a bypass flow path is arranged in parallel with the air-cooled heat exchanger, and the flow paths of the air-cooled heat exchanger and the chiller, as well as the bypass flow path, are both connected and blocked to the coolant circulation pipeline.

[0055] Among them, the above-mentioned chiller includes a compressor 21, an evaporator 23, an expansion valve 24 and a condenser 22 in which a refrigerant circulates. The refrigerant is compressed in the compressor 21 to form a high-temperature and high-pressure gas, enters the condenser 22, and is condensed after heat exchange with the air in the external environment under the action of the fan 16. It evaporates and absorbs heat in the evaporator 23 while cooling the coolant inside the evaporator 23.

[0056] The coolant is water or ethylene glycol. Specifically, the air-cooled heat exchanger 1 is connected in series with the evaporator 23 in the chiller. The evaporator 23 in the chiller is used to cool the coolant, while the air-cooled heat exchanger 1 uses outdoor air to cool the coolant.

[0057] See also Figure 1 and Figure 2 As shown, Figure 1The direction of the solid arrow indicates the flow direction of the coolant, and the direction of the hollow arrow indicates the flow direction of the refrigerant.

[0058] When the flow paths and bypass paths of the air-cooled heat exchanger and chiller are connected to the coolant circulation pipeline, refer to Figure 1 As shown, the coolant passes through the bypass flow path and the evaporator of the chiller (the coolant does not pass through the air-cooled heat exchanger 1 ), exchanges heat with the refrigerant, and then flows directly into the air conditioning equipment terminal 100 .

[0059] See also Figure 2 As shown, when there is a blocking state between the bypass flow paths and the coolant circulation pipeline, there is a conductive state between the flow paths where the air-cooled heat exchanger and the chiller are located and the coolant circulation pipeline, and all chillers are shut down, the coolant passes through the air-cooled heat exchanger 1 to exchange heat with the outside air, and then flows directly into the air-conditioning equipment terminal 100.

[0060] See also Figure 3 When there is a blockage between the bypass flow paths and the coolant circulation pipeline, there is a conductive state between the flow paths where the air-cooled heat exchanger and the chiller are located and the coolant circulation pipeline, some chillers fail, and some or all of the air-cooled heat exchangers are in operation, the coolant flows through the air-cooled heat exchanger to directly exchange heat with the external environment, and then passes through the evaporator 23 of the chiller to exchange heat with the refrigerant (the refrigerant exchanges heat with the external environment in the condenser 22 to cool down), and then flows into the air-conditioning equipment terminal 100 after cooling.

[0061] In the refrigeration system of this embodiment, when the outdoor environment is a high temperature environment, that is, when the outdoor temperature is greater than or equal to a first preset temperature, the flow path where the air-cooled heat exchanger and the chiller are located and the cooling liquid circulation pipeline are in a conductive state. In this way, even if the cooling liquid is difficult to cool down due to the high outdoor temperature, the refrigeration system can use the refrigerant circulating in the chiller to cool down; when the outdoor environment is a low temperature environment, that is, when the outdoor temperature is lower than the first preset temperature, the bypass flow path is controlled to be in a blocked state, the flow path where the air-cooled heat exchanger and the chiller are located is controlled to be in a conductive state, and all chillers are controlled to be shut down, so that the cooling liquid can be used to directly exchange heat with the outdoor environment, and the cooled cooling liquid can cool the terminal of the air-conditioning equipment to prevent the terminal of the air-conditioning equipment from being unable to cool down due to the compressor in the chiller being unable to start in a low temperature environment.

[0062] The above refrigeration system can still meet the refrigeration requirements of the air-conditioning terminal equipment when the outdoor ambient temperature is too high or too low, thereby ensuring the reliability of the refrigeration capacity of the air conditioner.

[0063] As an alternative embodiment, see Figure 1 、 Figure 2 、 Figure 3As shown, a first valve body is provided on the flow path where the air-cooled heat exchanger and the chiller are located. The first valve body is used to control whether the flow path where the air-cooled heat exchanger and the chiller are located and the coolant circulation pipeline are in a conducting state or a blocking state.

[0064] The above-mentioned first valve body 3 can be a solenoid valve. When the first valve body 3 is opened, the flow path where the air-cooled heat exchanger and the chiller are located and the coolant circulation pipeline are in a conductive state; when the first valve body 3 is closed, the flow path where the air-cooled heat exchanger and the chiller are located and the coolant circulation pipeline are in a blocked state.

[0065] As an alternative embodiment, see Figure 1 、 Figure 2 、 Figure 3 As shown, a second valve body is provided on the bypass flow path, and the second valve body is used to control the bypass flow path and the coolant circulation pipeline to be in a conducting state or a blocking state.

[0066] The above-mentioned second valve body 4 can be a solenoid valve. When the second valve body 4 is started, the bypass flow path and the coolant circulation pipeline are in a conducting state; when the second valve body 4 is closed, the bypass flow path and the coolant circulation pipeline are in a blocked state.

[0067] As an optional implementation, the chillers include more than two groups, and all the chillers are arranged in parallel.

[0068] The above structure can prevent the failure of a single chiller from causing the chiller to stop working. Even if the chiller on one branch fails, the remaining branches 200 of the chiller can still ensure smooth refrigeration. The remaining branches 200 of the chiller are each provided with a valve body, which controls whether the chiller on the corresponding branch 200 of the chiller is connected to the coolant circulation pipeline.

[0069] As an optional implementation, there are two or more air-cooled heat exchangers, and all of the air-cooled heat exchangers are arranged in parallel.

[0070] The above structure prevents the failure of a single air-cooled heat exchanger 1 from causing the system's other air-cooled heat exchangers to cease operation. Even if a failure occurs in one branch of the air-cooled heat exchanger 1, the remaining branches 300 of the air-cooled heat exchanger can still ensure smooth cooling. Each of the remaining branches 300 of the air-cooled heat exchanger is equipped with a valve body, which controls whether the corresponding air-cooled heat exchanger on the remaining branch 300 of the air-cooled heat exchanger is connected to the coolant circulation pipeline.

[0071] As an optional embodiment, the refrigeration system further includes a liquid replenishing device for replenishing coolant into the system pipeline, and the liquid replenishing device is connected to the main line of the coolant circulation pipeline. Figure 1 and Figure 2 As shown, the above-mentioned fluid replenishing device includes a fluid replenishing tank 6 containing coolant inside, and a pressure pump 7 is provided on the pipeline where the fluid replenishing tank 6 is located. The above-mentioned structure can replenish coolant in the system pipeline in time to prevent the system pipeline from cooling.

[0072] As an alternative embodiment, see Figure 1 and Figure 2 As shown, the main coolant circulation line is equipped with a supply pump 8 for increasing the coolant pressure. The supply pumps 8 may include one or more, with at least two pumps 8 arranged in parallel. The supply pumps 8 provide the required coolant flow and pressure to the air conditioning terminal 100. Even if a supply pump 8 on one of the branch lines fails, the above structure ensures smooth cooling operation.

[0073] As an alternative embodiment, see Figure 1 and Figure 2 As shown, a check valve 9 is provided on the branch where the liquid supply pump body 8 is located, which only allows the coolant to flow in one direction to prevent the coolant from flowing back.

[0074] As an alternative embodiment, see Figure 1 and Figure 2 As shown, a first temperature sensor 25 is provided on the chiller for detecting the temperature of the outdoor environment; specifically, the first temperature sensor 25 can be provided on the condenser of the chiller; a second temperature sensor 5 is provided at the liquid inlet end of the air-conditioning equipment terminal 100 for detecting the temperature of the coolant flowing into the air-conditioning equipment terminal 100.

[0075] The first temperature sensor 25 and the second temperature sensor 5 can respectively detect the external environment temperature and the temperature of the coolant flowing into the air-conditioning equipment terminal 100, so as to control the conduction or blocking of the branch where the chiller is located and the branch where the air-cooled heat exchanger is located according to the above temperatures.

[0076] The refrigeration system in this embodiment controls whether the chiller should be shut down by connecting or blocking the flow path between the air-cooled heat exchanger 1 and the chiller and the coolant circulation pipeline, and connecting or blocking the bypass flow path and the coolant circulation pipeline. This prevents the compressor from starting up in low-temperature environments, which could result in the refrigeration system failing to cool. It also prevents the coolant from being unable to dissipate heat when the outdoor temperature is too low. Even when the outdoor temperature is too high or too low, the cooling requirements of the air-conditioning terminal equipment can still be met, ensuring the reliability of the refrigeration system's cooling capacity.

[0077] Example 2

[0078] See also Figures 1-4 As shown, this embodiment provides a control method applicable to the above refrigeration system, and the control method includes:

[0079] Get the outdoor temperature;

[0080] If the outdoor temperature is greater than or equal to the first preset temperature, the flow path between the air-cooled heat exchanger and the chiller and the coolant circulation pipeline are controlled to be in a conductive state;

[0081] If not, the bypass flow path and the coolant circulation pipeline are controlled to be in a blocked state, the flow paths where the air-cooled heat exchanger and the chiller are located and the coolant circulation pipeline are controlled to be in a connected state, and all chillers are controlled to be shut down.

[0082] When the outdoor environment is a high temperature environment, that is, the outdoor temperature is greater than or equal to the first preset temperature, the flow path where the air-cooled heat exchanger and the chiller are located and the cooling liquid circulation pipeline are in a conductive state. In this way, even if the cooling liquid is difficult to cool down due to the high outdoor temperature, the refrigeration system can use the refrigerant circulating in the chiller to cool it down; when the outdoor environment is a low temperature environment, that is, the outdoor temperature is lower than the first preset temperature, the bypass flow path is controlled to be in the said blocking state, the flow path where the air-cooled heat exchanger and the chiller are located is controlled to be in the said conductive state, and all chillers are controlled to be shut down. The cooling liquid can be used to directly exchange heat with the outdoor environment, and the cooled cooling liquid can cool the terminal of the air-conditioning equipment to prevent the terminal of the air-conditioning equipment from being unable to cool down due to the compressor in the chiller being unable to start in a low temperature environment.

[0083] For details, see Figure 4 As shown, the control method of the refrigeration system of this embodiment specifically includes the following steps:

[0084] S10: Obtaining the outdoor temperature. Specifically, the outdoor temperature may be obtained by obtaining third-party weather data collected by the first temperature sensor 25 or an APP associated with the air conditioner. For example, weather data from a weather station may be obtained.

[0085] S20: Determine whether the outdoor temperature is greater than or equal to a first preset temperature.

[0086] S30: If the outdoor temperature is greater than or equal to a first preset temperature, determine whether all chillers are faulty; the first preset temperature is between 0° and 10°.

[0087] If the outdoor temperature is lower than the first preset temperature, the bypass flow path and the coolant circulation pipeline are blocked, the flow paths of the air-cooled heat exchanger and the chiller are connected to the coolant circulation pipeline, and all chillers are shut down. Figure 2 shown.

[0088] When the outdoor temperature is greater than or equal to the first preset temperature, the chiller can start normally at this temperature. Figure 1When the bypass flow path, the air-cooled heat exchanger and the flow path of the chiller are all connected to the coolant circulation pipeline, the coolant directly passes through the bypass flow path and enters the evaporator of the chiller without passing through the air-cooled heat exchanger, and the refrigerant can be used to cool the coolant.

[0089] See also Figure 3 When the bypass flow path and the coolant circulation pipeline are controlled to be in a blocked state, the flow path where the air-cooled heat exchanger and the chiller are located and the coolant circulation pipeline are controlled to be in a connected state, and part or all of the air-cooled heat exchangers are controlled to work, the refrigerant and outdoor air can be used to cool the coolant.

[0090] When the outdoor temperature is lower than the first preset temperature, there is a problem that the compressor 21 in the chiller is difficult to start, and the outdoor temperature is low. Figure 2 At this time, the bypass flow path is in a blocked state, the flow path where the air-cooled heat exchanger 1 and the chiller are located is in a connected state, and all chillers are shut down. When the chiller is shut down, the refrigerant cannot flow in the chiller. The refrigeration system uses outdoor air to cool the coolant and uses outdoor natural cold sources, which reduces energy consumption while ensuring the cooling effect.

[0091] S40: When the outdoor temperature is greater than or equal to the first preset temperature, if there is no branch fault in all the chillers, the bypass flow path, the air-cooled heat exchanger and the flow path where the chiller is located are controlled to be in a conductive state with the coolant circulation pipeline (the coolant does not pass through the air-cooled heat exchanger at this time); if there is a fault in one of all the chillers, then according to the relationship between the water supply temperature of the air-conditioning equipment terminal 100 and the minimum preset threshold and the maximum preset threshold, the bypass flow path and the coolant circulation pipeline are controlled to be in a conductive state.

[0092] Since multiple groups of chillers are arranged in parallel, even if one of the chillers fails, the refrigeration system can still perform cooling. At this time, it is necessary to determine whether the bypass flow path and the coolant circulation pipeline are in a conductive state or a blocked state based on the relationship between the water supply temperature of the air-conditioning equipment terminal 100 and the minimum preset threshold and the maximum preset threshold.

[0093] S50: If the water supply temperature of the air-conditioning equipment terminal 100 is greater than or equal to the minimum preset threshold and less than or equal to the maximum preset threshold, the flow path and bypass flow path of the air-cooled heat exchanger and the chiller are controlled to be in a conductive state with the coolant circulation pipeline; it means that the remaining chillers can meet the cooling demand of the air-conditioning equipment terminal 100. At this time, the bypass flow path and the coolant circulation pipeline can be placed in a conductive state to prevent the coolant from not being able to dissipate heat well in the air-cooled heat exchanger, such as Figure 1 shown.

[0094] If not, it means that the remaining chillers do not need to meet the cooling demand of the air-conditioning equipment terminal 100. At this time, the bypass flow path and the coolant circulation pipeline are controlled to be in a blocked state, the flow path between the air-cooled heat exchanger and the chiller and the coolant circulation pipeline are controlled to be in a conductive state, and some or all of the air-cooled heat exchangers 1 are controlled to work and operate to ensure that the refrigeration system can meet the cooling demand of the air-conditioning equipment terminal 100. Figure 3 shown.

[0095] At this time, the coolant can be cooled by both the outdoor ambient air and the refrigerant circulating in the chiller, so as to realize the cooling capacity output of the refrigeration system when the chiller fails, and ensure the reliability of the refrigeration performance of the refrigeration system.

[0096] Among them, the above-mentioned minimum preset threshold value Tmin is determined by the local outdoor environment dew point temperature TL. In order to ensure that the electronic equipment does not short-circuit and burn due to condensation generated on the surface of the coolant pipe dripping onto the electronic equipment, the preferred Tmin=TL+2, that is, the above-mentioned minimum preset threshold value is greater than the outdoor environment dew point temperature; the maximum preset threshold value Tmax is determined by the heat dissipation and cooling requirements of the electronic equipment. Under normal circumstances, the maximum preset threshold value Tmax is less than 40°C.

[0097] As an alternative embodiment, see Figure 3 As shown, when the bypass flow path and the coolant circulation pipeline are controlled to be in a blocked state, and the flow path where the air-cooled heat exchanger and the chiller are located and the coolant circulation pipeline are controlled to be in a connected state, if the absolute value of the difference between the outdoor temperature and the first preset temperature is less than or equal to the first preset difference, all air-cooled heat exchangers are controlled to operate; otherwise, some air-cooled heat exchangers are controlled to operate.

[0098] That is, when the absolute value of the difference between the outdoor environment and the first preset temperature is less than or equal to the first preset difference, it means that the difference between the outdoor temperature and the first preset temperature is small, and the cooling effect of the outdoor natural cold source on the coolant is poor. At this time, all air-cooled heat exchangers can be operated to increase the contact area between the coolant and the outdoor environmental control cold source to meet the cooling needs of the air-conditioning equipment terminal 100.

[0099] When the absolute value of the difference between the outdoor environment and the first preset temperature is less than or equal to the first preset difference a, the outdoor natural cold source has a better cooling effect on the coolant. At this time, some air-cooled heat exchangers can be operated to reduce energy consumption while meeting the cooling needs of the air-conditioning equipment terminal 100.

[0100] Specifically, if the absolute value of the difference between the outdoor temperature and the first preset temperature is greater than the first preset difference a and less than or equal to the second preset difference b, the number of operating air-cooled heat exchangers is reduced.

[0101] If the outdoor temperature is greater than the second preset difference b, the number of air-cooled heat exchangers in operation is further reduced. The first preset difference a is between 5°C and 15°C, and the second preset difference b is between 15°C and 25°C.

[0102] Specifically, when the absolute value of the difference between the outdoor temperature and the first preset temperature is greater than the first preset difference a and less than or equal to the second preset difference b, 2 / 3 of all air-cooled heat exchangers are put into operation; when the outdoor temperature is greater than the second preset difference b, the outdoor natural cold source has a better cooling effect on the coolant, so that 1 / 3 of all air-cooled heat exchangers are put into operation.

[0103] The above control method can reduce energy consumption while meeting the cooling demand of the air-conditioning equipment terminal 100.

[0104] Example 3

[0105] See also Figure 5 This embodiment provides a control device 400 applicable to the above-mentioned refrigeration system, including:

[0106] Detection module 401, used to obtain outdoor temperature;

[0107] The control module 402 is configured to control the flow path between the air-cooled heat exchanger and the chiller and the coolant circulation pipeline to be in the conductive state when the outdoor temperature is greater than or equal to a first preset temperature;

[0108] It is also used to control the bypass flow path and the coolant circulation pipeline to be in the blocked state when the outdoor temperature is lower than a first preset temperature, control the flow path between the air-cooled heat exchanger and the chiller and the coolant circulation pipeline to be in the connected state, and control all the chillers to shut down.

[0109] Regarding the control device for refrigeration of the refrigeration system in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the above related method, and will not be elaborated here.

[0110] Example 4

[0111] This embodiment provides an air conditioner, characterized in that it includes the above-mentioned refrigeration system.

[0112] Regarding the air conditioner in the above embodiment, the specific manner in which its processor executes the program in the memory has been described in detail in the embodiment of the method and will not be elaborated on here.

[0113] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0114] It should be noted that, in the description of this application, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, in the description of this application, unless otherwise specified, the meaning of "plurality" or "multiple" is at least two.

[0115] It should be understood that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intermediate element at the same time; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. In addition, the "connection" used here may include wireless connection; the wording "and / or" used includes any unit and all combinations of one or more associated listed items.

[0116] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0117] It should be understood that various parts of the present application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used to implement: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0118] Those skilled in the art will understand that all or part of the steps in the method of the above embodiment can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.

[0119] In addition, the functional units in the various embodiments of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into a module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0120] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0121] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0122] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A control method for a refrigeration system, characterized in that: The refrigeration system includes a chiller, an air-cooled heat exchanger, and a coolant circulation pipeline that passes through the end of the air-conditioning equipment and cools it, wherein: The air-cooled heat exchanger and the chiller are arranged in series, and both are used to cool the coolant; there is a bypass flow path arranged in parallel with the air-cooled heat exchanger, and the flow paths where the air-cooled heat exchanger and the chiller are located, and the bypass flow path are in a conducting state and a blocking state with the coolant circulation pipeline; The water chillers include more than two groups, and all the water chillers are arranged in parallel; The control method includes: Get the outdoor temperature; If the outdoor temperature is greater than or equal to a first preset temperature, determining whether all the chillers are faulty; If there is no branch fault in all the chillers, controlling the bypass flow path, the air-cooled heat exchanger, the flow path where the chiller is located, and the coolant circulation pipeline to be in the conductive state; If one of all the chillers has a fault, the bypass flow path and the coolant circulation pipeline are controlled to be in the conductive state or the blocked state according to the relationship between the water supply temperature at the end of the air-conditioning equipment and the minimum preset threshold and the maximum preset threshold; wherein, if the water supply temperature at the end of the air-conditioning equipment is greater than or equal to the minimum preset threshold and less than or equal to the maximum preset threshold, the bypass flow path and the coolant circulation pipeline are controlled to be in the conductive state; if not, the bypass flow path and the coolant circulation pipeline are controlled to be in the blocked state, and part or all of the air-cooled heat exchangers are controlled to operate; wherein, the minimum preset threshold is determined by the dew point temperature of the local outdoor environment, and the maximum preset threshold is determined by the heat dissipation and cooling requirements of the electronic equipment; If the outdoor temperature is lower than the first preset temperature, the bypass flow path and the coolant circulation pipeline are controlled to be in the blocking state, the flow path where the air-cooled heat exchanger and the chiller are located and the coolant circulation pipeline are controlled to be in the conducting state, and all the chillers are controlled to shut down.

2. The control method of the refrigeration system according to claim 1, characterized in that: A first valve body is provided on the flow path where the air-cooled heat exchanger and the chiller are located, and the first valve body is used to control the flow path where the air-cooled heat exchanger and the chiller are located and the coolant circulation pipeline to be in the conductive state or the blocked state.

3. The control method of the refrigeration system according to claim 1 or 2, characterized in that: A second valve body is provided on the bypass flow path, and the second valve body is used to control the bypass flow path and the coolant circulation pipeline to be in the conducting state or the blocking state.

4. The control method of the refrigeration system according to claim 1, characterized in that: There are more than two air-cooled heat exchangers, and all of the air-cooled heat exchangers are arranged in parallel.

5. The control method of the refrigeration system according to claim 1, characterized in that: The refrigeration system further includes a liquid replenishing device for replenishing coolant into the system pipeline, and the liquid replenishing device is connected to the main pipeline of the coolant circulation pipeline.

6. The control method of the refrigeration system according to claim 1, characterized in that: A liquid supply pump body for increasing the pressure of the coolant is provided on the main circuit of the coolant circulation pipeline. The liquid supply pump body includes one or more than two liquid supply pump bodies. When the number of the liquid supply pump bodies is more than two, there are at least two liquid supply pump bodies provided in parallel.

7. The control method of the refrigeration system according to claim 1, characterized in that: If the absolute value of the difference between the outdoor temperature and the first preset temperature is less than or equal to the first preset difference, all the air-cooled heat exchangers are controlled to operate; If not, the air-cooled heat exchanger described in the control part will start operating.

8. The control method of the refrigeration system according to claim 7, characterized in that: The control part of the air-cooled heat exchanger operates, including: If the absolute value of the difference between the outdoor temperature and the first preset temperature is greater than the first preset difference and less than or equal to the second preset difference, the number of operating operations of the air-cooled heat exchanger is reduced.

9. The control method of the refrigeration system according to claim 8, characterized in that: If the outdoor temperature is greater than a second preset difference, the number of operating air-cooled heat exchangers is further reduced.

10. A control device, applicable to the control method of the refrigeration system according to any one of claims 1 to 9, characterized in that: include: Detection module, used to obtain outdoor temperature; A control module, used to implement the control method of the refrigeration system according to any one of claims 1 to 9.

11. An air conditioner, characterized in that: The invention comprises a control method for a refrigeration system using the method described in any one of claims 1 to 9.

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