Multi-cold-source air conditioning system, evaporator, operation control method and related equipment

Abstract

The invention provides a multi-cold-source air-conditioning system, an evaporator, an operation control method and related equipment, at least two cold source subsystems and an evaporator set are arranged in the air-conditioning system, each cold source subsystem is connected with the evaporator set, each cold source subsystem can provide cold energy for a data center machine room through the evaporator set, mutual backup is carried out, and the cold energy is saved. It is guaranteed that when part of the cold source subsystems break down, the evaporator set can still provide cooling capacity for the data center through other cold source subsystems, the reliability of the refrigerating system is improved, meanwhile, the at least two cold source subsystems conduct heat conversion through different refrigerating devices, the corresponding refrigerating devices are used for providing the cooling capacity in different environments, and the refrigerating efficiency is improved. The diversity of cold supply modes is improved, and the reliability of the refrigerating system is improved.

Description

Technical Field

[0001] The present application relates to the technical field of refrigeration equipment, and in particular to a multi-cold source air-conditioning system, an evaporator, an operation control method and related equipment. Background Art

[0002] Data centers, commonly known as computer rooms, include computer systems, communication systems, storage systems, environmental control equipment, monitoring equipment, and various safety devices. Power Usage Effectiveness (PUE) is a general indicator for measuring the energy efficiency level of data centers. The smaller the PUE, the higher the energy efficiency level of the data center, and the higher the energy efficiency ratio of the air conditioner in the data center computer room.

[0003] With the reduction of PUE requirements in recent years, multi-split system air conditioners with higher energy efficiency and more convenient engineering installation have gradually replaced traditional unit air conditioners in data centers. Since multi-split system air conditioners include a refrigeration host and multiple refrigeration terminals, and the refrigeration host provides cooling to each refrigeration terminal, when the refrigeration host fails, the refrigeration terminals will no longer be able to provide cooling to the computer room, which will have a serious impact on the safe operation of the data center.

[0004] Therefore, how to improve the reliability of the refrigeration system has become the focus of research. Summary of the invention

[0005] The present application provides a multi-cold source air-conditioning system, an evaporator, an operation control method and related equipment to improve the reliability of the refrigeration system.

[0006] In a first aspect, the present application provides a multi-cold source air conditioning system, comprising:

[0007] At least two cold source subsystems and one evaporator group, each cold source subsystem is connected to the evaporator group;

[0008] The at least two heat sink subsystems include a first heat sink subsystem and a second heat sink subsystem;

[0009] The first cold source subsystem includes a compressor unit, a condenser unit, a first refrigerant pump unit, and the compressor unit, the condenser unit, the first refrigerant pump unit and the evaporator group are sequentially connected through pipelines to form a first closed loop structure;

[0010] The second cold source subsystem includes a heat exchanger unit, which is provided with a refrigerant input end, a refrigerant output end, a chilled water input end, and a chilled water output end; the refrigerant input end, the refrigerant output end, and the evaporator group are connected by pipelines to form a second closed loop structure; the chilled water input end is used to obtain chilled water, and the chilled water output end is used to output chilled water;

[0011] The evaporator group includes at least one evaporator, and the evaporators are connected in parallel.

[0012] In the above technical scheme, at least two cold source subsystems and one evaporator group are arranged in the air-conditioning system, and each cold source subsystem is connected to the evaporator group. Each cold source subsystem can provide cooling to the data center computer room through the evaporator group to back up each other, so as to ensure that when some cold source subsystems fail, the evaporator group can still use other cold source subsystems to provide cooling to the data center, thereby improving the reliability of the refrigeration system. At the same time, at least two cold source subsystems use different refrigeration equipment for heat conversion, so that corresponding refrigeration equipment can be used to provide cooling in different environments, thereby increasing the diversity of cooling supply methods and improving the reliability of the refrigeration system.

[0013] Optionally, the evaporator comprises:

[0014] At least two coil branches, the number of each coil branch and each cold source subsystem is the same and corresponds one to one;

[0015] Each coil branch is arranged on a pipeline of a closed-loop structure composed of its corresponding cold source subsystem.

[0016] Optionally, at least two coil branches include:

[0017] A first coil branch disposed on the pipeline between the compressor unit and the first refrigerant pump unit;

[0018] and a second coil branch disposed on the pipeline between the input end and the output end of the heat exchanger unit;

[0019] The first coil branches are connected in parallel, and the second coil branches are connected in parallel.

[0020] Optionally, the evaporator further comprises an evaporator fan;

[0021] The evaporator fan is located on one side of the first coil branch and the second coil branch, and the first coil branch and the second coil branch are placed along the wind direction of the evaporator fan.

[0022] In the above technical scheme, each evaporator in the evaporator group to which each cold source subsystem is simultaneously connected includes coil branches with the same number as the cold source subsystem, which are connected correspondingly to the cold source subsystems and obtain cooling energy independently from the corresponding cold source subsystems. Each coil branch is placed in parallel along the wind direction of the evaporator fan. When some cold source subsystems fail and the corresponding coil branches cannot provide cooling energy with the circulating air provided by the evaporator fan, the remaining coil branches can still provide cooling energy to the circulating air, thereby ensuring the stability of the air-conditioning system.

[0023] In a second aspect, the present application provides a multi-cold source air conditioning system, comprising:

[0024] At least two cold source subsystems and one evaporator group, each cold source subsystem is connected to the evaporator group;

[0025] The at least two heat sink subsystems include a first heat sink subsystem and a second heat sink subsystem;

[0026] The first cold source subsystem includes a compressor unit, a condenser unit, a first refrigerant pump unit, and the compressor unit, the condenser unit, the first refrigerant pump unit and the evaporator group are sequentially connected through pipelines to form a first closed loop structure;

[0027] The second cold source subsystem includes a chilled water flow regulating unit, and the chilled water flow regulating unit and the evaporator group are connected through a pipeline;

[0028] The evaporator group includes at least one evaporator, and each evaporator is connected in parallel;

[0029] The chilled water flow regulating unit includes at least one chilled water flow regulating valve. The number of chilled water flow regulating valves and evaporators is the same and corresponds one to one. Each chilled water flow regulating valve is connected to the first end of the corresponding evaporator as a chilled water output end, and the second end of the evaporator serves as a chilled water input end.

[0030] In the above technical solution, at least two cold source subsystems and one evaporator group are arranged in the air-conditioning system, and each cold source subsystem is connected to the evaporator group. Each cold source subsystem can provide cooling to the data center computer room through the evaporator group to back up each other, so as to ensure that when some cold source subsystems fail, the evaporator group can still use other cold source subsystems to provide cooling to the data center, thereby improving the reliability of the refrigeration system. At the same time, at least two cold source subsystems use different refrigeration equipment such as a compressor unit and a first refrigerant pump unit to convert heat, so that corresponding refrigeration equipment can be used to provide cooling in different environments, thereby improving the utilization rate of natural cold sources and improving the energy efficiency of the system.

[0031] In a third aspect, the present application provides an evaporator, the evaporator being located in a link structure composed of at least two cold source subsystems, the link structure composed of at least two cold source subsystems comprising a first link structure and a second link structure;

[0032] The first link structure includes a compressor unit, a condenser unit, a first refrigerant pump unit and an evaporator connected in sequence;

[0033] The second link structure includes a heat exchanger unit and an evaporator connected in series, or a chilled water flow regulating unit and an evaporator connected in series.

[0034] In the above technical solution, the evaporator forms a link structure with at least two cold source subsystems at the same time, so that when at least one link structure is in operation, the evaporator installed at the air-conditioning terminal can provide cooling to the data center computer room, thereby improving the reliability of the cooling provided by the air-conditioning terminal.

[0035] In a fourth aspect, the present application provides an operation control method for a multi-cold source air conditioning system, the method being applied to the multi-cold source air conditioning system as involved in the first aspect, the working mode of the first cold source subsystem includes a standby mode, a compressor cooling mode, or a refrigerant pump natural cooling mode, and the working mode of the second cold source subsystem includes a standby mode or a heat pipe mode;

[0036] Methods include:

[0037] Obtain indoor temperature, outdoor temperature, indoor and outdoor temperature difference and cooling demand;

[0038] According to the outdoor temperature, the indoor and outdoor temperature difference and the cooling demand, at least one cold source subsystem is controlled to operate in a non-standby mode to provide cooling to the evaporator group.

[0039] In the above technical scheme, the controller of the multi-cold source air-conditioning system controls at least one of the multiple cold source subsystems connected to the evaporator group to operate in non-standby mode according to the sampled indoor and outdoor temperatures and the cooling requirements set by the user, and provides cooling to the evaporator group so that the air-conditioning terminals corresponding to the evaporator group provide cooling to the data center computer room. Compared with a single cold source system, the multi-cold source air-conditioning system has higher reliability.

[0040] Optionally, according to the outdoor temperature, the indoor and outdoor temperature difference and the cooling demand, at least one cold source subsystem is controlled to operate in a non-standby mode to provide cooling to the evaporator group, specifically including:

[0041] When the outdoor temperature is lower than the preset temperature threshold, the indoor and outdoor temperature difference is greater than the preset temperature difference threshold, and the refrigerant pump natural cooling mode is in the enabled state, the first cold source subsystem is controlled to operate in the refrigerant pump natural cooling mode to provide cooling to the evaporator group;

[0042] When the outdoor temperature is greater than or equal to the preset temperature threshold, or the indoor and outdoor temperature difference is less than or equal to the preset temperature difference threshold, or the refrigerant pump natural cooling mode is not enabled, the first cold source subsystem is controlled to operate in compressor cooling mode or standby mode.

[0043] In the above technical solution, when the outdoor temperature is lower than a preset temperature threshold and the indoor and outdoor temperature difference is greater than a preset temperature difference threshold, the controller determines that there is an abundant outdoor natural cold source. When the natural cooling mode of the refrigerant pump of the first cold source subsystem is in an enabled state, that is, when the natural cooling mode of the refrigerant pump is available, the controller controls the operation of the first refrigerant pump and related equipment to transmit the outdoor natural cooling to the indoor area, so as to realize the data center's use of natural cooling for cooling and improve the system energy efficiency.

[0044] Optionally, the method further comprises:

[0045] When the heat pipe mode is not in the enabled state, the second cold source subsystem is controlled to operate in the standby state;

[0046] When the heat pipe mode is in the enabled state, the second cold source subsystem is controlled to operate in the heat pipe mode.

[0047] Optionally, controlling the second cold source subsystem to operate in a heat pipe mode specifically includes:

[0048] Control the operation of heat exchanger units;

[0049] Control the chilled water flow regulating valve to open;

[0050] The opening of the chilled water flow regulating valve and the rotation speed of the first refrigerant pump are adjusted according to the cooling capacity required for refrigeration.

[0051] Optionally, adjusting the opening of the chilled water flow regulating valve and the rotation speed of the first refrigerant pump according to the cooling capacity required for refrigeration specifically includes:

[0052] The speed of the first refrigerant pump is preferentially adjusted according to the cooling capacity required for refrigeration;

[0053] When the rotation speed of the first refrigerant pump is greater than the first preset rotation speed and the cooling capacity provided by the multi-cold source air-conditioning system is less than the cooling capacity required for refrigeration, increasing the opening of the chilled water flow regulating valve;

[0054] When the opening of the chilled water flow regulating valve is less than the first preset opening and the cooling capacity provided by the multi-cold source air-conditioning system is greater than the cooling capacity required for refrigeration, the rotation speed of the first refrigerant pump is reduced.

[0055] In the above technical solution, when the controller controls the first cold source subsystem to use the first refrigerant pump to provide cooling, and controls the second cold source subsystem to use the heat exchanger unit to exchange heat with external chilled water to provide cooling, the natural cooling mode of the refrigerant pump of the first cold source subsystem responds first, and the heat pipe mode of the second cold source subsystem is used as a backup cold source to implement the principle of last response first exit, thereby improving the utilization rate of the natural cold source, reducing the power consumption of the air-conditioning system refrigeration, and the energy efficiency of the air-conditioning system.

[0056] Optionally, the second cold source subsystem further includes a second refrigerant pump unit, and the second refrigerant pump unit is arranged on a pipeline between the heat exchanger unit and the evaporator group; the method further includes:

[0057] The second refrigerant pump unit is controlled to start, and the speed of the second refrigerant pump unit is adjusted according to the cooling capacity required for refrigeration.

[0058] In the above technical solution, by adding a second refrigerant pump unit to the second closed-loop structure composed of the second cold source subsystem, the cooling efficiency can be improved when the second cold source subsystem is in the heat pipe mode.

[0059] Optionally, controlling the first cold source subsystem to operate in a compressor cooling mode or a standby mode specifically includes:

[0060] When the heat pipe mode is in the enabled state, the second cold source subsystem is controlled to operate in the heat pipe mode, and the first cold source subsystem is controlled to operate in the compressor cooling mode or the standby mode;

[0061] When the heat pipe mode is not in the enabled state and the compressor cooling mode is in the enabled state, the second cold source subsystem is controlled to operate in the standby mode and the first cold source subsystem is controlled to operate in the compressor cooling mode.

[0062] Optionally, controlling the first cold source subsystem to operate in a compressor cooling mode specifically includes:

[0063] The condenser module, the compressor, and the first refrigerant pump bypass valve are controlled to be opened, the compressor bypass valve and the first refrigerant pump are controlled to be closed, and the speed of the compressor and the opening of the chilled water flow regulating valve are adjusted according to the cooling capacity required for refrigeration.

[0064] Optionally, adjusting the speed of the compressor and the opening of the chilled water flow regulating valve according to the cooling capacity required for refrigeration may specifically include:

[0065] Prioritize the opening of the chilled water flow regulating valve according to the cooling capacity required;

[0066] When the opening of the chilled water flow regulating valve is greater than the second preset opening and the cooling capacity provided by the multi-cold source air-conditioning system is less than the cooling capacity required for refrigeration, increasing the speed of the compressor;

[0067] When the rotation speed of the compressor is less than the second preset rotation speed and the cooling capacity provided by the multi-cold source air-conditioning system is greater than the cooling capacity required for refrigeration, the opening of the chilled water flow regulating valve is reduced.

[0068] In the above technical solution, during the change of cooling demand, the heat pipe mode of the second cold source subsystem responds first, and the compressor cooling mode of the first cold source subsystem implements the principle of last response first exit as a backup cold source, so as to reduce the compressor power and improve the energy efficiency of the air-conditioning system.

[0069] Optionally, when the heat pipe mode is in an enabled state, controlling the second cold source subsystem to operate in the heat pipe mode, and controlling the first cold source subsystem to operate in the compressor cooling mode or the standby mode specifically includes:

[0070] When the heat pipe mode is in an enabled state and the cooling capacity required is less than a preset cooling capacity threshold, the second cooling source subsystem is controlled to operate in the heat pipe mode and the first cooling source subsystem is controlled to operate in the standby mode;

[0071] When the heat pipe mode is in an enabled state and the cooling capacity required is greater than or equal to a preset cooling capacity threshold, the second cold source subsystem is controlled to operate in the heat pipe mode and the first cold source subsystem is controlled to operate in the compressor cooling mode.

[0072] In the above technical solution, when the first refrigerant pump cannot be used and the cooling capacity required is less than the preset cooling capacity threshold, the heat pipe mode of the second cold source subsystem can provide the cooling capacity required by the data center, and the first cold source subsystem can remain in standby mode to reduce the energy consumption of mechanical refrigeration; when the cooling capacity required is greater than or equal to the preset cooling capacity threshold, the heat pipe mode of the second cold source subsystem cannot provide the cooling capacity required by the data center, and the compressor of the first cold source subsystem is turned on to meet the cooling demand, thereby ensuring the reliability of the air-conditioning system.

[0073] Optionally, obtaining indoor temperature, outdoor temperature, and indoor and outdoor temperature specifically includes:

[0074] Obtaining a return air temperature of a condenser of a condenser unit and determining it as an outdoor temperature;

[0075] Obtain the return air temperature of each evaporator and determine it as the indoor sampling temperature;

[0076] The mean value of each indoor sampling temperature is determined as the indoor temperature;

[0077] The difference between the outdoor temperature and the indoor temperature is determined as the indoor and outdoor temperature.

[0078] In the above technical solution, when sampling the indoor temperature, since the return air of the evaporator is the temperature obtained from the computer room of the data center, and each cold source subsystem provides cooling to the evaporator at different positions in the computer room, it is more accurate to use the average of the return air temperature of the evaporator as the indoor temperature, and the corresponding calculated indoor and outdoor temperature difference is more accurate, thereby improving the accuracy of controlling the operating status of the air-conditioning system based on the indoor temperature and the indoor and outdoor temperature difference.

[0079] In a fifth aspect, the present application provides an operation control method for a multi-cold source air conditioning system, the method being applied to the multi-cold source air conditioning system as involved in the second aspect, the working mode of the first cold source subsystem includes a standby mode, a compressor cooling mode or a refrigerant pump natural cooling mode, and the working mode of the second cold source subsystem includes a standby mode or a chilled water mode;

[0080] Methods include:

[0081] Obtain indoor temperature, outdoor temperature, indoor and outdoor temperature difference and cooling demand;

[0082] According to the outdoor temperature, the indoor and outdoor temperature difference and the cooling demand, at least one cold source subsystem is controlled to operate in a non-standby mode to provide cooling to the evaporator group.

[0083] Optionally, controlling the first cold source subsystem to operate in a refrigerant pump natural cooling mode specifically includes:

[0084] Control the condenser module, the compressor bypass valve, and the first refrigerant pump to open, control the compressor and the first refrigerant pump bypass valve to close, and adjust the speed of the first refrigerant pump according to the cooling capacity required for refrigeration;

[0085] When the chilled water mode is not in the enabled state, the second cold source subsystem is controlled to operate in the standby state;

[0086] When the chilled water mode is in the enabled state, the second cold source subsystem is controlled to operate in the chilled water mode.

[0087] In a sixth aspect, the present application provides a motion control device for a multi-cold source air conditioning system, comprising:

[0088] An acquisition module is used to obtain indoor temperature, outdoor temperature, indoor and outdoor temperature difference and cooling demand;

[0089] The processing module is used to control at least one cold source subsystem to operate in a non-standby mode to provide cooling to the evaporator group according to the outdoor temperature, the indoor and outdoor temperature difference and the cooling demand.

[0090] In a seventh aspect, the present application provides a controller, comprising: a processor and a memory communicatively connected to the processor;

[0091] Memory stores computer-executable instructions;

[0092] When executing the computer-executable instructions, the processor is used to implement the method involved in the fourth aspect or the fifth aspect.

[0093] In an eighth aspect, the present application provides a computer-readable storage medium, in which computer instructions are stored. When the computer instructions are executed by a processor, they are used to implement the method involved in the fourth aspect or the fifth aspect.

[0094] The present application provides a multi-cold source air-conditioning system, an evaporator, an operation control method and related equipment. At least two cold source subsystems and an evaporator group are arranged in the air-conditioning system. Each cold source subsystem is connected to the evaporator group. Each cold source subsystem can provide cold energy to the computer room of the data center through the evaporator group to back up each other. When some cold source subsystems fail, the evaporator group can still use other cold source subsystems to provide cold energy to the data center, thereby improving the reliability of the refrigeration system. At the same time, at least two cold source subsystems use different refrigeration equipment for heat conversion, so that corresponding refrigeration equipment can be used to provide cold energy in different environments, thereby improving the diversity of cold energy provision methods and improving the reliability of the refrigeration system. BRIEF DESCRIPTION OF THE DRAWINGS

[0095] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0096] Figure 1 This is a structural schematic diagram of a multi-cold source air conditioning system provided by the present application according to an exemplary embodiment;

[0097] Figure 2 This is a structural schematic diagram of a multi-cold source air conditioning system provided by the present application according to another exemplary embodiment;

[0098] Figure 3 This is a schematic structural diagram of an evaporator provided in accordance with an exemplary embodiment of the present application;

[0099] Figure 4 This is a structural schematic diagram of a multi-cold source air conditioning system provided by the present application according to another exemplary embodiment;

[0100] Figure 5 An operation control method for a multi-cold source air conditioning system provided by the present application according to an exemplary embodiment;

[0101] Figure 6 An operation control method for a multi-cold source air conditioning system provided by the present application according to another exemplary embodiment;

[0102] Figure 7 An operation control method for a multi-cold source air conditioning system provided by the present application according to another exemplary embodiment;

[0103] Figure 8 This is a structural schematic diagram of an operation control device provided by the present application according to an exemplary embodiment;

[0104] Fig. 9 This is a schematic diagram of the structure of a controller provided according to an embodiment of the present application.

[0105] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0106] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0107] The present application provides a multi-cold source air-conditioning system, an evaporator, an operation control method and related equipment. At least two cold source subsystems and an evaporator group are arranged in the air-conditioning system. Each cold source subsystem is connected to the evaporator group. Each cold source subsystem can provide cold energy to the computer room of the data center through the evaporator group to back up each other. When some cold source subsystems fail, the evaporator group can still use other cold source subsystems to provide cold energy to the data center, thereby improving the reliability of the refrigeration system. At the same time, at least two cold source subsystems use different refrigeration equipment for heat conversion, so that corresponding refrigeration equipment can be used to provide cold energy in different environments, thereby improving the diversity of cold energy provision methods and improving the reliability of the refrigeration system.

[0108] Figure 1 This is a structural schematic diagram of a multi-cold source air conditioning system provided by the present application according to an exemplary embodiment, such as Figure 1 As shown, the multi-cold source air conditioning system includes at least two cold source subsystems and an evaporator group 104 , and each cold source subsystem is connected to the evaporator group 104 .

[0109] The at least two cold source subsystems include a first cold source subsystem and a second cold source subsystem. The first cold source subsystem includes a compressor unit 102 , a condenser unit 101 , and a first refrigerant pump unit 103 , and the second cold source subsystem includes a heat exchanger unit 107 .

[0110] When the first cold source subsystem and the evaporator group 104 are connected, the compressor unit 102, the condenser unit 101, the first refrigerant pump unit 103 and the evaporator group 104 are connected in sequence through pipelines to form a first closed-loop structure. The connecting pipelines in the closed-loop structure are refrigerant pipelines for transmitting refrigerant. The refrigerant types include but are not limited to R22, R410A, and R134a.

[0111] The compressor unit 102 includes at least one compressor 1021 and at least one compressor bypass valve 1022. In a cold source subsystem, the compressor 1021 and the compressor bypass valve 1022 are connected in parallel.

[0112] The first refrigerant pump unit 103 includes at least one first refrigerant pump 1031 and at least one first refrigerant pump bypass valve 1032 . In one cold source subsystem, the first refrigerant pump 1031 and the first refrigerant pump bypass valve 1032 are connected in parallel.

[0113] When the second cold source subsystem is connected to the evaporator group 104, the heat exchanger unit 107 is provided with a refrigerant input end, a refrigerant output end, a chilled water input end, and a chilled water output end.

[0114] The refrigerant input end, the refrigerant output end and the evaporator group 104 are connected through pipelines to form a second closed-loop structure, and the connecting pipeline in the closed-loop interface is a refrigerant pipeline.

[0115] The chilled water input end of the heat exchanger unit 107 is used to obtain chilled water, and the chilled water output end is used to output chilled water.

[0116] The evaporator group 104 includes at least one evaporator 1041, and each evaporator 1041 is connected in parallel. The number of evaporators 1041 is determined by the number of air conditioner terminals.

[0117] The evaporator comprises at least two coil branches, and the number of each coil branch and each cold source subsystem is the same and corresponds one to one.

[0118] Each coil branch is independent of each other and is set on the pipeline of the closed-loop structure composed of its corresponding cold source subsystem. Figure 1 In the air conditioning system structure shown, two cold source subsystems are included. When there are two air conditioning terminals, the evaporator group 104 includes two evaporators 1041, and each evaporator 1041 is connected to each cold source subsystem. Since there are two cold source subsystems, each evaporator includes two coil branches 1042 and 1043, wherein the two coil branches 1042 are connected in parallel to the first cold source subsystem, and the two coil branches 1043 are connected in parallel to the second cold source subsystem.

[0119] The at least two coil branches of the evaporator may be arranged in the same evaporator unit or in different units respectively, which is not specifically limited here.

[0120] In addition to the above-mentioned coil branches, the structure of the evaporator also includes an evaporator fan, which is located on one side of the first coil branch 1042 and the second coil branch 1043. The first coil branch and the second coil branch are placed side by side along the wind direction of the evaporator fan.

[0121] Figure 3 This is a cross-sectional view of the first coil branch 1042 and the second coil branch 1043 provided in accordance with an embodiment of the present application. In this cross-section, the first coil branch 1042 and the second coil branch 1043 are placed side by side, and the evaporator fan can be set on the left side of the two coil branches 1042, or on the right side of the two coil branches 1043, or perpendicular to the interface of the two coil branches, as long as the air duct cross-section of the evaporator fan overlaps with the first coil branch 1042 and the second coil branch 1043. That is to say, when the evaporator fan provides circulating air, the circulating air can pass through the first coil branch 1042 and the second coil branch 1043, and perform heat exchange with each coil branch to obtain the cooling capacity provided by the coil branches.

[0122] The evaporator also includes a throttling element 108, which is arranged on the pipeline between the first coil branch and the first refrigerant pump unit, and is used for throttling and reducing pressure, so that after the refrigerant enters the evaporator through the throttling element 108, it absorbs heat and evaporates at the required low pressure, thereby achieving the purpose of cooling and cooling.

[0123] The number of the throttling elements 108 and the number of the first coil branches 1042 are the same and correspond one to one, so as to separately control the operation of each evaporator.

[0124] The second cold source subsystem further includes a chilled water regulating valve 106 , which is disposed at the input end of the heat exchanger unit 107 and is used to regulate the flow of chilled water entering the heat exchanger unit 107 .

[0125] In addition, the multi-cold source air-conditioning system also includes a controller, a temperature monitoring device and an input device. The controller is respectively connected to the compressor unit 102, the condenser unit 101, the first condensation pump unit 103, the evaporator fan, the throttling element 108, and the chilled water regulating valve 106, and is used to control the operation of each device. Among them, the controller can be one or more, and each controller is connected to different devices. There is no specific limitation here. When there are multiple controllers, the controllers are communicated and connected to coordinately control the operation of the air-conditioning system.

[0126] The temperature monitoring device is arranged at the return air inlet of each evaporator and the return air inlet of the condenser in the condenser unit 101. The temperature monitoring device arranged at the return air inlet of the evaporator is used to sample the indoor temperature, and the temperature monitoring device arranged at the return air inlet of the condenser is used to sample the outdoor temperature.

[0127] The input device is a device for inputting cooling demand into the air-conditioning system. The device may be a remote controller, an interactive device, or an intelligent device, so that the controller can obtain the cooling demand.

[0128] The controller can adjust the operation of the air-conditioning system according to the indoor and outdoor temperatures obtained by the temperature monitoring device and the cooling demand input by the input device.

[0129] When the first cold source subsystem is in operation, there are working modes such as standby mode, compressor cooling mode or refrigerant pump natural cooling mode.

[0130] In the standby mode, all devices in the first closed-loop structure do not work.

[0131] In the compressor refrigeration mode, the compressor 1021, the condenser unit 101, the first refrigerant pump bypass valve 1032, the throttling element 108 and the evaporator unit 104 are turned on, and the speed of the compressor 1021 and the opening of the first refrigerant pump bypass valve 1032, the opening of the throttling element 108, the speed of the evaporator fan and the condenser fan are adjusted according to the cooling demand obtained by the controller and the indoor and outdoor temperatures.

[0132] In the natural cooling mode of the refrigerant pump, the compressor bypass valve 1021, the condenser unit 101, the first refrigerant pump 1031, the throttling element 108 and the evaporator unit 104 are opened, and the speed of the first refrigerant pump 1031 and the opening of the compressor bypass valve 1021, the opening of the throttling element 108, the speed of the evaporator fan and the condenser fan are adjusted according to the cooling demand obtained by the controller and the indoor and outdoor temperatures.

[0133] When the second cold source subsystem is running, there are working modes such as standby mode and heat pipe mode.

[0134] In the standby mode, the heat exchanger unit 107 and the evaporator group 104 do not work, and the chilled water flow regulating valve 106 is not opened.

[0135] In the heat pipe mode, the chilled water flow valve 106 is opened and controls the operation of the heat exchanger unit 107 and the evaporator group 104. The chilled water flows into the heat exchanger unit 107 from the chilled water input end, absorbs heat from the refrigerant in the pipeline between the refrigerant input end and the refrigerant output end of the heat exchanger, and then outputs the chilled water with increased temperature from the chilled water output end.

[0136] The low-temperature refrigerant output from the refrigerant output end of the heat exchanger passes through the second coil branch in the evaporator to absorb heat and release cold energy to the environment where the evaporator is located.

[0137] The structural diagram of another multi-cold source air conditioning system provided by this application is as follows Figure 2 As shown, compared to Figure 1The structure shown only adds a second refrigerant pump device 109 in the second cold source subsystem, and the second refrigerant pump device 109 is arranged on the pipeline between the heat exchanger unit 107 and the evaporator group 104. It is used to speed up the transmission speed of the refrigerant in the second closed-loop structure when the second cold source subsystem operates in the heat pipe mode.

[0138] Therefore, in Figure 2 In the system shown, when the second cold source subsystem operates in the heat pipe mode, it is necessary not only to control the opening of the chilled water flow valve 106 and the operation of the heat exchanger unit 107 and the evaporator group 104, but also to control the operation of the second refrigerant pump device 109, and adjust the speed of the second refrigerant pump device 109, the speed of the evaporator fan and the opening of the chilled water flow valve 106 according to the refrigeration demand obtained by the controller and the indoor and outdoor temperatures.

[0139] The structural schematic diagram of another multi-cold source air conditioning system provided by the present application is as follows Figure 4 As shown, compared to Figure 1 In the structure shown, the second cold source subsystem includes a chilled water flow regulating unit 105, and the chilled water flow regulating unit 105 and the evaporator group 104 are connected by a pipeline, and the formed link is used to transmit chilled water.

[0140] The evaporator group 104 includes at least one evaporator 1041, and each evaporator 1041 is connected in parallel. The chilled water flow regulating unit 105 includes at least one chilled water flow regulating valve 106. The number of chilled water flow regulating valves 106 and the number of evaporators 1041 are the same and correspond one to one. Each chilled water flow regulating valve 106 is connected to the first end of the corresponding evaporator 1041 as a chilled water output end, and the second end of the evaporator serves as a chilled water input end.

[0141] More specifically, the chilled water flow regulating valve 106 is connected to the second coil branch in the corresponding evaporator 1041, and is used to control the flow of chilled water transmitted in the second coil branch. After the first end of the second coil branch of each evaporator is connected to the first end of the chilled water flow regulating valve 106, the second end of the chilled water flow regulating valve 106 serves as a chilled water output end, and the second end of the second coil branch of each evaporator serves as a chilled water input end.

[0142] In this embodiment, when the second cold source subsystem is in operation, there are working modes such as a standby mode and a chilled water mode.

[0143] In the standby mode, the evaporator group 104 does not work and the chilled water flow regulating valve 106 does not open.

[0144] In the chilled water mode, the chilled water flow valve 106 is opened and controls the operation of the evaporator group 104. The chilled water flows into the evaporator from the chilled water input end, absorbs heat, and is output from the chilled water output end through the chilled water flow valve 106. The evaporator reduces the temperature of the circulating air generated by the evaporator fan by absorbing heat, thereby providing cooling to the data center computer room.

[0145] Figure 5 The present application provides an operation control method for the above three multi-cold source air-conditioning systems according to an exemplary embodiment, and the method includes:

[0146] S101. Obtain indoor temperature, outdoor temperature, indoor and outdoor temperature difference, and cooling demand.

[0147] The return air temperature of the condenser of the condenser unit is obtained and determined as the outdoor temperature.

[0148] Obtain the return air temperature of each evaporator and determine it as the indoor sampling temperature.

[0149] The mean of the indoor sampling temperatures is determined as the indoor temperature.

[0150] The difference between the outdoor temperature and the indoor temperature is determined as the indoor-outdoor temperature difference.

[0151] S102: According to the outdoor temperature, the indoor and outdoor temperature difference and the cooling demand, control at least one cold source subsystem to operate in a non-standby mode to provide cooling to the evaporator group.

[0152] That is to say, when at least two cold source subsystems are connected to an evaporator group, when the first cold source subsystem operates in standby mode, the second cold source subsystem operates in heat pipe mode or chilled water mode; when the second cold source subsystem operates in standby mode, the first cold source subsystem operates in compressor refrigeration mode or refrigerant pump natural cooling mode; it is also possible that both cold source subsystems do not operate in standby mode and provide cooling at the same time.

[0153] In the above technical scheme, the controller of the multi-cold source air-conditioning system controls at least one of the multiple cold source subsystems connected to the evaporator group to operate in non-standby mode according to the sampled indoor and outdoor temperatures and the cooling requirements set by the user, and provides cooling to the evaporator group so that the air-conditioning terminals corresponding to the evaporator group provide cooling to the data center computer room. Compared with a single cold source system, the multi-cold source air-conditioning system has higher reliability.

[0154] The specific control strategies of the above three air-conditioning systems are explained below.

[0155] Figure 6 The present application provides an operation control method for a multi-cold source air conditioning system according to another exemplary embodiment, and the method is applied to Figure 1 or Figure 2The cold source air conditioning system in the illustrated embodiment, the method comprises:

[0156] S201. Obtain indoor temperature, outdoor temperature, indoor and outdoor temperature difference, and cooling demand.

[0157] This step is the same as step S101 and will not be repeated here.

[0158] S202: Determine whether the outdoor temperature is less than a preset temperature threshold.

[0159] If the outdoor temperature is lower than the preset temperature threshold, proceed to step S204;

[0160] If the outdoor temperature is greater than or equal to the preset temperature threshold, proceed to step S203.

[0161] S203: Determine whether the heat pipe mode is in an enabled state.

[0162] In one embodiment, when the heat exchanger unit is unavailable and / or the chilled water regulating valve is unavailable, the heat pipe mode is unavailable and is not enabled. The unavailable state is caused by a fault or can be manually set to unavailable.

[0163] If the heat pipe mode is in the enabled state, proceed to step S209;

[0164] If the heat pipe mode is not enabled, go to step S212.

[0165] S204: Determine whether the indoor and outdoor temperature difference is greater than a preset temperature difference threshold.

[0166] When the indoor and outdoor temperature difference is greater than the preset temperature difference threshold, proceed to step S205;

[0167] When the indoor and outdoor temperature difference is less than or equal to the preset temperature difference threshold, the process goes to step S203.

[0168] S205: Determine whether the natural cooling mode of the refrigerant pump is in an enabled state.

[0169] In one embodiment, when at least one of the following conditions exists, the natural cooling mode of the refrigerant pump is not available and is not in an enabled state:

[0170] The first refrigerant pump unit is abnormal, the compressor bypass valve is abnormal, the throttling element is abnormal, and the condenser is abnormal.

[0171] When the natural cooling mode of the refrigerant pump is enabled, proceed to step S206;

[0172] When the natural cooling mode of the refrigerant pump is not enabled, the process goes to step S203.

[0173] S206: Determine whether the heat pipe mode is in an enabled state.

[0174] When the heat pipe mode is in the enabled state, proceed to step S208;

[0175] When the heat pipe mode is not in the enable mode, go to step S207.

[0176] S207, controlling the first cold source subsystem to operate in a refrigerant pump natural cooling mode and the second cold source subsystem to operate in a standby mode.

[0177] When the outdoor temperature is lower than the preset temperature threshold and the indoor and outdoor temperature difference is higher than the preset temperature difference threshold, the controller determines that there is abundant outdoor natural cooling source. When the natural cooling mode of the refrigerant pump of the first cold source subsystem is in the enabled state, that is, when the natural cooling mode of the refrigerant pump is available, the controller controls the operation of the first refrigerant pump and related equipment to transmit the outdoor natural cooling to the indoor room, so as to realize the use of natural cooling for cooling the data center and improve the energy efficiency of the system.

[0178] When the refrigerant pump is running in natural cooling mode, the condenser module, the compressor bypass valve, and the first refrigerant pump are controlled to be opened, the compressor and the first refrigerant pump bypass valve are controlled to be closed, and the speed of the first refrigerant pump is adjusted according to the cooling capacity required for refrigeration.

[0179] The higher the cooling demand, the greater the rotation speed of the first refrigerant pump.

[0180] S208, controlling the first cold source subsystem to operate in a refrigerant pump natural cooling mode and the second cold source subsystem to operate in a heat pipe mode.

[0181] The specific situation of controlling the first cold source subsystem to operate in the natural cooling mode of the refrigerant pump has been explained in detail in step S207 and will not be repeated here.

[0182] In Control Figure 1 When the second cold source subsystem in the air-conditioning system shown operates in the heat pipe mode, the heat exchanger unit is controlled to operate, the chilled water flow regulating valve is controlled to open, and the opening of the chilled water flow regulating valve and the speed of the first refrigerant pump are adjusted according to the cooling capacity required.

[0183] In Control Figure 2 When the second cold source subsystem in the air conditioning system shown is operated in the heat pipe mode, it is also necessary to control the second refrigerant pump unit to start, and adjust the speed of the second refrigerant pump unit according to the cooling capacity required for refrigeration. The speed of the second refrigerant pump is positively correlated with the opening of the chilled water flow regulating valve and is adjusted at the same time.

[0184] When the refrigerant pump is running in natural cooling mode and heat pipe mode at the same time, the speed of the first refrigerant pump is preferentially adjusted according to the cooling capacity required. When the speed of the first refrigerant pump is greater than the first preset speed and the cooling capacity provided by the multi-cold source air-conditioning system is less than the cooling capacity required, the opening of the chilled water flow regulating valve is increased.

[0185] When the opening of the chilled water flow regulating valve is less than the first preset opening and the cooling capacity provided by the multi-cold source air-conditioning system is greater than the cooling capacity required for refrigeration, the rotation speed of the first refrigerant pump is reduced.

[0186] In the above technical solution, when the controller controls the first cold source subsystem to use the first refrigerant pump to provide cooling, and controls the second cold source subsystem to use the heat exchanger unit to exchange heat with external chilled water to provide cooling, the natural cooling mode of the refrigerant pump of the first cold source subsystem responds first, and the heat pipe mode of the second cold source subsystem is used as a backup cold source to implement the principle of last response first exit, thereby improving the utilization rate of the natural cold source, reducing the power consumption of the air-conditioning system refrigeration, and the energy efficiency of the air-conditioning system.

[0187] S209: Determine whether the cooling capacity required is less than a preset cooling capacity threshold.

[0188] When the cooling capacity required is less than the preset cooling capacity threshold, the process proceeds to step S211;

[0189] When the cooling capacity of the cooling demand is greater than or equal to the preset cooling capacity threshold, the process goes to step S210.

[0190] S210, controlling the first cold source subsystem to operate in a compressor cooling mode and the second cold source subsystem to operate in a heat pipe mode.

[0191] When the cooling demand is greater than or equal to the preset cooling capacity threshold, the heat pipe mode of the second cold source subsystem cannot provide the cooling required by the data center. The compressor of the first cold source subsystem is turned on to meet the cooling demand and ensure the reliability of the air-conditioning system.

[0192] The operation of the heat pipe mode has been explained in detail in step S208 and will not be repeated here.

[0193] When the first cold source subsystem is controlled to operate in the compressor refrigeration mode, the condenser module, the compressor, and the first refrigerant pump bypass valve are controlled to be opened, the compressor bypass valve and the first refrigerant pump are controlled to be closed, and the speed of the compressor and the opening of the chilled water flow regulating valve are adjusted according to the cooling capacity required.

[0194] More specifically, the opening of the chilled water flow regulating valve is preferentially adjusted according to the cooling capacity required for refrigeration. When the opening of the chilled water flow regulating valve is greater than a second preset opening and the cooling capacity provided by the multi-cold source air-conditioning system is less than the cooling capacity required for refrigeration, the speed of the compressor is increased. When the speed of the compressor is less than the second preset speed and the cooling capacity provided by the multi-cold source air-conditioning system is greater than the cooling capacity required for refrigeration, the opening of the chilled water flow regulating valve is reduced.

[0195] In the above technical solution, during the change of cooling demand, the heat pipe mode of the second cold source subsystem responds first, and the compressor cooling mode of the first cold source subsystem implements the principle of last response first exit as a backup cold source, so as to reduce the compressor power and improve the energy efficiency of the air-conditioning system.

[0196] S211, controlling the first cold source subsystem to operate in a standby mode and the second cold source subsystem to operate in a heat pipe mode.

[0197] When the first refrigerant pump is unavailable and the cooling demand is less than the preset cooling capacity threshold, the heat pipe mode of the second cooling source subsystem can provide the cooling required by the data center, and the first cooling source subsystem can remain in standby mode to reduce the energy consumption of mechanical refrigeration.

[0198] S212: Determine whether the compressor cooling mode is in an enabled state.

[0199] When the compressor cooling mode is in the enabled state, go to step S213.

[0200] When the compressor cooling mode is not in the enabled state, it is determined that the multi-cold source air-conditioning system fails, the first cold source subsystem and the second cold source subsystem are in the standby state, and the air-conditioning system cannot provide cooling.

[0201] S213, controlling the first cold source subsystem to operate in a compressor cooling mode and the second cold source subsystem to operate in a standby mode.

[0202] The operation of the compressor cooling mode has been explained in detail in step S210 and will not be repeated here.

[0203] In the above technical solution, at least two cold source subsystems and one evaporator group are arranged in the air-conditioning system, and each cold source subsystem is connected to the evaporator group. Each cold source subsystem can provide cooling to the data center computer room through the evaporator group to back up each other, so as to ensure that when some cold source subsystems fail, the evaporator group can still use other cold source subsystems to provide cooling to the data center, thereby improving the reliability of the refrigeration system. At the same time, at least two cold source subsystems use different refrigeration equipment such as a compressor unit and a first refrigerant pump unit to convert heat, so that corresponding refrigeration equipment can be used to provide cooling in different environments, thereby improving the utilization rate of natural cold sources and improving the energy efficiency of the system.

[0204] Figure 7 The present application provides an operation control method for a multi-cold source air conditioning system according to another exemplary embodiment, and the method is applied to Figure 4 The cold source air conditioning system in the illustrated embodiment, the method comprises:

[0205] S301. Obtain indoor temperature, outdoor temperature, indoor and outdoor temperature difference, and cooling demand.

[0206] S302: Determine whether the outdoor temperature is less than a preset temperature threshold.

[0207] If the outdoor temperature is lower than the preset temperature threshold, proceed to step S304;

[0208] If the outdoor temperature is greater than or equal to the preset temperature threshold, proceed to step S303.

[0209] S303: Determine whether the chilled water mode is in an enabled state.

[0210] If the chilled water mode is in the enabled state, proceed to step S309;

[0211] If the chilled water mode is not enabled, go to step S312.

[0212] S304: Determine whether the indoor and outdoor temperature difference is greater than a preset temperature difference threshold.

[0213] When the indoor and outdoor temperature difference is greater than the preset temperature difference threshold, proceed to step S305;

[0214] When the indoor and outdoor temperature difference is less than or equal to the preset temperature difference threshold, the process goes to step S303.

[0215] S305: Determine whether the natural cooling mode of the refrigerant pump is in an enabled state.

[0216] When the natural cooling mode of the refrigerant pump is enabled, proceed to step S306;

[0217] When the natural cooling mode of the refrigerant pump is not enabled, the process goes to step S303.

[0218] S306: Determine whether the chilled water mode is in an enabled state.

[0219] When the chilled water mode is in the enabled state, proceed to step S308;

[0220] When the chilled water mode is not in the enable mode, proceed to step S307.

[0221] S307, controlling the first cold source subsystem to operate in a refrigerant pump natural cooling mode and the second cold source subsystem to operate in a standby mode.

[0222] S308, controlling the first cold source subsystem to operate in a refrigerant pump natural cooling mode and the second cold source subsystem to operate in a chilled water mode.

[0223] When the second cold source subsystem operates in the chilled water mode, the chilled water regulating valve is controlled to open and the evaporator is operated, and the opening of the chilled water regulating valve is adjusted according to the indoor and outdoor temperatures and the cooling demand.

[0224] When the refrigerant pump is running in natural cooling mode and chilled water mode at the same time, the speed of the first refrigerant pump is adjusted first. When the speed is greater than the first preset speed but still cannot meet the cooling demand, the opening of the chilled water regulating valve is gradually increased to enable the air-conditioning system to meet the cooling demand.

[0225] When the cooling demand decreases, the opening of the chilled water regulating valve is preferentially reduced. When the opening is less than the first preset opening and still provides excess cooling capacity, the rotation speed of the first refrigerant pump is gradually reduced to meet the cooling demand.

[0226] S309: Determine whether the cooling capacity required is less than a preset cooling capacity threshold.

[0227] When the cooling capacity required is less than the preset cooling capacity threshold, the process proceeds to step S311;

[0228] When the cooling capacity of the cooling demand is greater than or equal to the preset cooling capacity threshold, the process goes to step S310.

[0229] S310, controlling the first cold source subsystem to operate in a compressor cooling mode and the second cold source subsystem to operate in a chilled water mode.

[0230] When the second chilled water mode is available, the opening of the chilled water regulating valve can be adjusted first, and then the speed of the compressor can be adjusted to meet the cooling demand, so as to minimize the mechanical energy consumption of the compressor and improve the energy efficiency of the system.

[0231] S311, control the first cold source subsystem to operate in standby mode and the second cold source subsystem to operate in chilled water mode.

[0232] S312: Determine whether the compressor cooling mode is in an enabled state.

[0233] When the compressor cooling mode is in the enabled state, go to step S313;

[0234] When the compressor cooling mode is not in the enabled state, it is determined that the multi-cold source air-conditioning system fails, the first cold source subsystem and the second cold source subsystem are in the standby state, and the air-conditioning system cannot provide cooling.

[0235] S313, controlling the first cold source subsystem to operate in a compressor cooling mode and the second cold source subsystem to operate in a standby mode.

[0236] When the second cold source subsystem is unable to provide cooling capacity, the first cold source subsystem is controlled to operate in the compressor cooling mode to achieve cooling capacity backup, ensuring that the air-conditioning terminal can output cooling capacity corresponding to the cooling demand.

[0237] Figure 8 This is a schematic diagram of the structure of an operation control device provided according to an embodiment of the present application. The operation control device 400 includes an acquisition module 401 and a processing module 402, wherein:

[0238] The acquisition module 401 is used to acquire the indoor temperature, the outdoor temperature, the indoor and outdoor temperature difference and the cooling demand.

[0239] The processing module 402 is used to control at least one cold source subsystem to operate in a non-standby mode to provide cooling to the evaporator group according to the outdoor temperature, the indoor and outdoor temperature difference and the cooling demand.

[0240] In one feasible embodiment, the processing module 402 is further configured to:

[0241] When the outdoor temperature is lower than the preset temperature threshold, the indoor and outdoor temperature difference is greater than the preset temperature difference threshold, and the refrigerant pump natural cooling mode is in the enabled state, the first cold source subsystem is controlled to operate in the refrigerant pump natural cooling mode to provide cooling to the evaporator group;

[0242] When the outdoor temperature is greater than or equal to the preset temperature threshold, or the indoor and outdoor temperature difference is less than or equal to the preset temperature difference threshold, or the refrigerant pump natural cooling mode is not enabled, the first cold source subsystem is controlled to operate in compressor cooling mode or standby mode.

[0243] In one feasible embodiment, the processing module 402 is further configured to:

[0244] The condenser module, the compressor bypass valve, and the first refrigerant pump are controlled to be turned on, the compressor and the first refrigerant pump bypass valve are controlled to be closed, and the speed of the first refrigerant pump is adjusted according to the cooling capacity required for refrigeration.

[0245] In one feasible embodiment, the processing module 402 is further configured to:

[0246] When the heat pipe mode is not in the enabled state, the second cold source subsystem is controlled to operate in the standby state;

[0247] When the heat pipe mode is in the enabled state, the second cold source subsystem is controlled to operate in the heat pipe mode.

[0248] In one feasible embodiment, the processing module 402 is further configured to:

[0249] Control the operation of heat exchanger units;

[0250] Control the chilled water flow regulating valve to open;

[0251] The opening of the chilled water flow regulating valve and the rotation speed of the first refrigerant pump are adjusted according to the cooling capacity required for refrigeration.

[0252] In one feasible embodiment, the processing module 402 is further configured to:

[0253] The speed of the first refrigerant pump is preferentially adjusted according to the cooling capacity required for refrigeration;

[0254] When the rotation speed of the first refrigerant pump is greater than the first preset rotation speed and the cooling capacity provided by the multi-cold source air-conditioning system is less than the cooling capacity required for refrigeration, increasing the opening of the chilled water flow regulating valve;

[0255] When the opening of the chilled water flow regulating valve is less than the first preset opening and the cooling capacity provided by the multi-cold source air-conditioning system is greater than the cooling capacity required for refrigeration, the rotation speed of the first refrigerant pump is reduced.

[0256] In one feasible embodiment, the processing module 402 is further configured to:

[0257] The second refrigerant pump unit is controlled to start, and the speed of the second refrigerant pump unit is adjusted according to the cooling capacity required for refrigeration.

[0258] In one feasible embodiment, the processing module 402 is further configured to:

[0259] When the heat pipe mode is in the enabled state, the second cold source subsystem is controlled to operate in the heat pipe mode, and the first cold source subsystem is controlled to operate in the compressor cooling mode or the standby mode;

[0260] When the heat pipe mode is not in the enabled state and the compressor cooling mode is in the enabled state, the second cold source subsystem is controlled to operate in the standby mode and the first cold source subsystem is controlled to operate in the compressor cooling mode.

[0261] In one feasible embodiment, the processing module 402 is further configured to:

[0262] The condenser module, the compressor, and the first refrigerant pump bypass valve are controlled to be opened, the compressor bypass valve and the first refrigerant pump are controlled to be closed, and the speed of the compressor and the opening of the chilled water flow regulating valve are adjusted according to the cooling capacity required for refrigeration.

[0263] In one feasible embodiment, the processing module 402 is further configured to:

[0264] Prioritize the opening of the chilled water flow regulating valve according to the cooling capacity required;

[0265] When the opening of the chilled water flow regulating valve is greater than the second preset opening and the cooling capacity provided by the multi-cold source air-conditioning system is less than the cooling capacity required for refrigeration, increasing the speed of the compressor;

[0266] When the rotation speed of the compressor is less than the second preset rotation speed and the cooling capacity provided by the multi-cold source air-conditioning system is greater than the cooling capacity required for refrigeration, the opening of the chilled water flow regulating valve is reduced.

[0267] In one feasible embodiment, the processing module 402 is further configured to:

[0268] When the heat pipe mode is in an enabled state and the cooling capacity required is less than a preset cooling capacity threshold, the second cooling source subsystem is controlled to operate in the heat pipe mode and the first cooling source subsystem is controlled to operate in the standby mode;

[0269] When the heat pipe mode is in an enabled state and the cooling capacity required is greater than or equal to a preset cooling capacity threshold, the second cold source subsystem is controlled to operate in the heat pipe mode and the first cold source subsystem is controlled to operate in the compressor cooling mode.

[0270] In a feasible embodiment, the acquisition module 401 is specifically used for:

[0271] Obtaining a return air temperature of a condenser of a condenser unit and determining it as an outdoor temperature;

[0272] Obtain the return air temperature of each evaporator and determine it as the indoor sampling temperature;

[0273] The mean value of each indoor sampling temperature is determined as the indoor temperature;

[0274] The difference between the outdoor temperature and the indoor temperature is determined as the indoor-outdoor temperature difference.

[0275] In one feasible embodiment, the processing module 402 is further configured to:

[0276] Control the condenser module, the compressor bypass valve, and the first refrigerant pump to open, control the compressor and the first refrigerant pump bypass valve to close, and adjust the speed of the first refrigerant pump according to the cooling capacity required for refrigeration;

[0277] When the chilled water mode is not in the enabled state, the second cold source subsystem is controlled to operate in the standby state;

[0278] When the chilled water mode is in the enabled state, the second cold source subsystem is controlled to operate in the chilled water mode.

[0279] Fig. 9 The present application is provided with a schematic diagram of the structure of a controller according to an embodiment. The controller 500 includes a memory 501 and a processor 502, and the memory 501 is used to store computer instructions executable by the processor. The memory 501 may include a high-speed random access memory (Random Access Memory, RAM), and may also include a non-volatile memory (Non-Volatile Memory, NVM), such as at least one disk memory, and may also be a USB flash drive, a mobile hard disk, a read-only memory, a disk or an optical disk, etc.

[0280] The processor 502 implements each step of the operation control method in the above embodiment with the controller as the execution subject when executing the computer instruction. For details, please refer to the relevant description in the above method embodiment. The processor 502 can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the invention can be directly embodied as being executed by a hardware processor, or executed by a combination of hardware and software modules in the processor.

[0281] Optionally, the memory 501 can be independent or integrated with the processor 502. When the memory 501 is independently provided, the controller 500 further includes a bus for connecting the memory 501 and the processor 502. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, the bus in the drawings of the present application is not limited to only one bus or one type of bus.

[0282] The embodiment of the present application also provides a computer-readable storage medium, in which computer instructions are stored. When a processor executes the computer instructions, each step of the operation control method in the above embodiment is implemented.

[0283] An embodiment of the present application also provides a computer program product, including computer instructions, which, when executed by a processor, implement the various steps of the operation control method in the above embodiment.

[0284] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0285] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A multi-cold source air conditioning system, characterized in that: include: At least two cold source subsystems and one evaporator group, each of the cold source subsystems is connected to the evaporator group; The at least two cold source subsystems include a first cold source subsystem and a second cold source subsystem; The first cold source subsystem includes a compressor unit, a condenser unit, and a first refrigerant pump unit, wherein the compressor unit, the condenser unit, the first refrigerant pump unit, and the evaporator group are sequentially connected through pipelines to form a first closed loop structure; The second cold source subsystem includes a heat exchanger unit, the heat exchanger unit is provided with a refrigerant input end, a refrigerant output end, a chilled water input end, and a chilled water output end; the refrigerant input end, the refrigerant output end, and the evaporator group are connected by pipelines to form a second closed loop structure; the chilled water input end is used to obtain chilled water, and the chilled water output end is used to output the chilled water; The evaporator group includes at least one evaporator, and the evaporators are connected in parallel.

2. The multi-cold source air conditioning system according to claim 1, characterized in that: The evaporator comprises: At least two coil branches, the number of each coil branch and each cold source subsystem is the same and corresponds one to one; Each of the coil branches is arranged on a pipeline of a closed-loop structure formed by its corresponding cold source subsystem.

3. The multi-cold source air conditioning system according to claim 2, characterized in that: The at least two coil branches include: a first coil branch disposed on the pipeline between the compressor unit and the first refrigerant pump unit; and a second coil branch disposed on the pipeline between the input end and the output end of the heat exchanger unit; Wherein, each of the first coil branches is connected in parallel, and each of the second coil branches is connected in parallel.

4. The multi-cold source air conditioning system according to claim 3, characterized in that: The evaporator also includes an evaporator fan; The evaporator fan is located on one side of the first coil branch and the second coil branch, and the first coil branch and the second coil branch are placed along the wind direction of the evaporator fan.

5. The multi-cold source air conditioning system according to claim 3, characterized in that: The evaporator also includes a throttling element; The throttling element is arranged on the pipeline between the first coil branch and the first refrigerant pump unit.

6. The multi-cold source air conditioning system according to claim 1, characterized in that: The compressor unit includes a compressor and a compressor bypass valve, and the first refrigerant pump unit includes a first refrigerant pump and a first refrigerant pump bypass valve; The compressor and the compressor bypass valve are connected in parallel; The first refrigerant pump and the first refrigerant pump bypass valve are connected in parallel.

7. The multi-cold source air conditioning system according to claim 6, characterized in that: The second cold source subsystem also includes a chilled water flow regulating valve; The chilled water flow regulating valve is connected to the chilled water input end of the heat exchanger unit through a pipeline.

8. The multi-cold source air conditioning system according to claim 6 or 7, characterized in that: The second cold source subsystem also includes a second refrigerant pump unit; The second refrigerant pump unit is disposed on a pipeline between the heat exchanger unit and the evaporator group.

9. The multi-cold source air conditioning system according to claim 8, characterized in that: The multi-cold source air conditioning system further includes: a temperature monitoring device for monitoring indoor and outdoor temperatures, and a controller respectively connected to the temperature monitoring device, the first refrigerant pump unit, the compressor unit, the evaporator group and the chilled water flow regulating valve; The controller is used to control the compressor bypass valve and the first refrigerant pump to open and the compressor to close when a refrigeration demand is obtained and a first refrigeration condition is met; the first refrigeration condition includes that the outdoor temperature is less than a preset temperature threshold, the indoor and outdoor temperature difference is greater than a preset temperature difference threshold, and the refrigerant pump natural cooling mode of the multi-cold source air-conditioning system is in an enabled state; When a cooling demand is obtained and the heat pipe mode of the multi-cold source air-conditioning system is in an enabled state, controlling the heat exchanger unit and the chilled water flow regulating valve to open; When the refrigeration demand is obtained and the second refrigeration condition is met, the compressor and the first refrigerant pump bypass valve are controlled to open, and the first refrigerant pump is closed; the second refrigeration condition includes that the outdoor temperature is greater than or equal to the preset temperature threshold, or the indoor and outdoor temperatures are less than or equal to the preset temperature difference threshold, or the natural cooling mode of the refrigerant pump is not in an enabled state, and the cooling capacity of the refrigeration demand is greater than or equal to the preset cooling capacity threshold; When the cooling demand is obtained and the third cooling condition is met, the compressor and the first refrigerant pump bypass valve are controlled to open, and the first refrigerant pump is closed; the third cooling condition includes that the outdoor temperature is greater than or equal to the preset temperature threshold, or the indoor and outdoor temperatures are less than or equal to the preset temperature difference threshold, or the natural cooling mode of the refrigerant pump is not in an enabled state, and the heat pipe mode is not in an enabled state.

10. The multi-cold source air conditioning system according to claim 9, characterized in that: The multi-cold source air conditioning system further includes: a controller connected to the second refrigerant pump unit; The controller is also used to control the second refrigerant pump unit to turn on when the cooling demand is obtained and the heat pipe mode is in an enabled state.

11. The multi-cold source air conditioning system according to claim 1, characterized in that: The connecting pipelines in the first closed-loop structure and the second closed-loop structure are refrigerant pipelines, and the optional types of refrigerants in the refrigerant pipelines include any one of R22, R410A or R134a.

12. A multi-cold source air conditioning system, characterized in that: include: At least two cold source subsystems and one evaporator group, each of the cold source subsystems is connected to the evaporator group; The at least two cold source subsystems include a first cold source subsystem and a second cold source subsystem; The first cold source subsystem includes a compressor unit, a condenser unit, and a first refrigerant pump unit, wherein the compressor unit, the condenser unit, the first refrigerant pump unit, and the evaporator group are sequentially connected through pipelines to form a first closed loop structure; The second cold source subsystem comprises a chilled water flow regulating unit, and the chilled water flow regulating unit is connected to the evaporator group through a pipeline; The evaporator group includes at least one evaporator, and each of the evaporators is connected in parallel; The chilled water flow regulating unit includes at least one chilled water flow regulating valve, the number of the chilled water flow regulating valves and the evaporators are the same and correspond one to one, each of the chilled water flow regulating valves is connected to the first end of the corresponding evaporator as a chilled water output end, and the second end of the evaporator is used as a chilled water input end.

13. The multi-cold source air conditioning system according to claim 12, characterized in that: The connecting pipeline in the first closed-loop structure is a refrigerant pipeline, and the optional type of refrigerant in the refrigerant pipeline includes any one of R22, R410A or R134a; The connecting pipeline between the chilled water input end and the chilled water output end is a chilled water pipeline, which is used to transmit chilled water.

14. An evaporator, characterized in that: The evaporator is located in a link structure composed of at least two cold source subsystems, and the link structure composed of at least two cold source subsystems includes a first link structure and a second link structure; The first link structure includes a compressor unit, a condenser unit, a first refrigerant pump unit and the evaporator connected in sequence; The second link structure includes a heat exchanger unit and the evaporator connected in sequence, or a chilled water flow regulating unit and the evaporator connected in sequence.

15. An operation control method for a multi-cold source air conditioning system, the method being applied to the multi-cold source air conditioning system as claimed in claim 1, wherein the working mode of the first cold source subsystem includes a standby mode, a compressor cooling mode or a refrigerant pump natural cooling mode, and the working mode of the second cold source subsystem includes a standby mode or a heat pipe mode; It is characterized in that The method comprises: Obtain indoor temperature, outdoor temperature, indoor and outdoor temperature difference and cooling demand; According to the outdoor temperature, the indoor and outdoor temperature difference and the cooling demand, at least one cold source subsystem is controlled to operate in a non-standby mode to provide cooling to the evaporator group.

16. The operation control method according to claim 15, characterized in that: According to the outdoor temperature, the indoor and outdoor temperature difference and the cooling demand, controlling at least one cold source subsystem to operate in a non-standby mode to provide cooling to the evaporator group specifically includes: When the outdoor temperature is lower than a preset temperature threshold, the indoor and outdoor temperature difference is higher than a preset temperature difference threshold, and the refrigerant pump natural cooling mode is in an enabled state, the first cold source subsystem is controlled to operate in the refrigerant pump natural cooling mode to provide cooling to the evaporator group; When the outdoor temperature is greater than or equal to the preset temperature threshold, or the indoor and outdoor temperature difference is less than or equal to the preset temperature difference threshold, or the natural cooling mode of the refrigerant pump is not enabled, the first cold source subsystem is controlled to operate in the compressor cooling mode or the standby mode.

17. The operation control method according to claim 16, characterized in that: Controlling the first cold source subsystem to operate in a refrigerant pump natural cooling mode specifically includes: The condenser module, the compressor bypass valve, and the first refrigerant pump are controlled to be turned on, the compressor and the first refrigerant pump bypass valve are controlled to be closed, and the speed of the first refrigerant pump is adjusted according to the cooling capacity required for refrigeration.

18. The operation control method according to claim 17, characterized in that: The method further comprises: When the heat pipe mode is not in an enabled state, controlling the second cold source subsystem to operate in a standby state; When the heat pipe mode is in an enabled state, the second cold source subsystem is controlled to operate in the heat pipe mode.

19. The operation control method according to claim 18, characterized in that: Controlling the second cold source subsystem to operate in a heat pipe mode specifically includes: Control the operation of heat exchanger units; Control the chilled water flow regulating valve to open; The opening of the chilled water flow regulating valve and the rotation speed of the first refrigerant pump are adjusted according to the cooling capacity of the refrigeration demand.

20. The operation control method according to claim 19, characterized in that: Adjusting the opening of the chilled water flow regulating valve and the speed of the first refrigerant pump according to the cooling capacity of the refrigeration demand specifically includes: Prioritizing adjusting the speed of the first refrigerant pump according to the cooling capacity of the refrigeration demand; When the rotation speed of the first refrigerant pump is greater than a first preset rotation speed and the cooling capacity provided by the multi-cold source air-conditioning system is less than the cooling capacity required for refrigeration, increasing the opening of the chilled water flow regulating valve; When the opening of the chilled water flow regulating valve is less than a first preset opening and the cooling capacity provided by the multi-cold source air-conditioning system is greater than the cooling capacity required for refrigeration, the rotation speed of the first refrigerant pump is reduced.

21. The operation control method according to claim 19, characterized in that: The second cold source subsystem further includes a second refrigerant pump unit, and the second refrigerant pump unit is disposed on a pipeline between the heat exchanger unit and the evaporator group; the method further includes: The second refrigerant pump unit is controlled to be turned on, and the rotation speed of the second refrigerant pump unit is adjusted according to the cooling capacity required for refrigeration.

22. The operation control method according to claim 16, characterized in that: Controlling the first cold source subsystem to operate in the compressor cooling mode or the standby mode specifically includes: When the heat pipe mode is in an enabled state, controlling the second cold source subsystem to operate in the heat pipe mode, and controlling the first cold source subsystem to operate in the compressor cooling mode or the standby mode; When the heat pipe mode is not in an enabled state and the compressor cooling mode is in an enabled state, the second cold source subsystem is controlled to operate in the standby mode and the first cold source subsystem is controlled to operate in the compressor cooling mode.

23. The operation control method according to claim 22, characterized in that: Controlling the first cold source subsystem to operate in the compressor cooling mode specifically includes: The condenser module, the compressor, and the first refrigerant pump bypass valve are controlled to be opened, the compressor bypass valve and the first refrigerant pump are controlled to be closed, and the speed of the compressor and the opening of the chilled water flow regulating valve are adjusted according to the cooling capacity required for the refrigeration.

24. The operation control method according to claim 23, characterized in that: The speed of the compressor and the opening of the chilled water flow regulating valve are adjusted according to the cooling capacity of the refrigeration demand, specifically including: Prioritizing the opening of the chilled water flow regulating valve according to the cooling capacity of the refrigeration demand; When the opening of the chilled water flow regulating valve is greater than a second preset opening and the cooling capacity provided by the multi-cold source air-conditioning system is less than the cooling capacity required for refrigeration, increasing the speed of the compressor; When the rotation speed of the compressor is less than a second preset rotation speed and the cooling capacity provided by the multi-cold source air-conditioning system is greater than the cooling capacity required for refrigeration, the opening degree of the chilled water flow regulating valve is reduced.

25. The operation control method according to claim 22, characterized in that: When the heat pipe mode is in an enabled state, controlling the second cold source subsystem to operate in the heat pipe mode, and controlling the first cold source subsystem to operate in the compressor cooling mode or the standby mode specifically includes: When the heat pipe mode is in an enabled state and the cooling capacity of the cooling demand is less than a preset cooling capacity threshold, controlling the second cooling source subsystem to operate in the heat pipe mode and the first cooling source subsystem to operate in the standby mode; When the heat pipe mode is in an enabled state and the cooling capacity of the cooling demand is greater than or equal to the preset cooling capacity threshold, the second cooling source subsystem is controlled to operate in the heat pipe mode, and the first cooling source subsystem is controlled to operate in the compressor cooling mode.

26. The operation control method according to claim 15, characterized in that: Get indoor temperature, outdoor temperature, and indoor and outdoor temperature difference, including: Obtaining a return air temperature of a condenser of a condenser unit and determining it as the outdoor temperature; Obtain the return air temperature of each evaporator and determine it as the indoor sampling temperature; Determine the average of the indoor sample temperatures as the indoor temperature; The difference between the outdoor temperature and the indoor temperature is determined as the indoor-outdoor temperature difference.

27. An operation control method for a multi-cold source air conditioning system, the method being applied to the multi-cold source air conditioning system according to claim 12, wherein the working mode of the first cold source subsystem includes a standby mode, a compressor cooling mode or a refrigerant pump natural cooling mode, and the working mode of the second cold source subsystem includes a standby mode or a chilled water mode; It is characterized in that The method comprises: Obtain indoor temperature, outdoor temperature, indoor and outdoor temperature difference and cooling demand; According to the outdoor temperature, the indoor and outdoor temperature difference and the cooling demand, at least one cold source subsystem is controlled to operate in a non-standby mode to provide cooling to the evaporator group.

28. The operation control method according to claim 27, characterized in that: According to the outdoor temperature, the indoor and outdoor temperature difference and the cooling demand, controlling at least one cold source subsystem to operate in a non-standby mode to provide cooling to the evaporator group specifically includes: When the outdoor temperature is lower than a preset temperature threshold, the indoor and outdoor temperature difference is higher than a preset temperature difference threshold, and the refrigerant pump natural cooling mode is in an enabled state, the first cold source subsystem is controlled to operate in the refrigerant pump natural cooling mode to provide cooling to the evaporator group; When the outdoor temperature is greater than or equal to the preset temperature threshold, or the indoor and outdoor temperature difference is less than or equal to the preset temperature difference threshold, or the refrigerant pump natural cooling mode is not in the enabled state, the first cold source subsystem is controlled not to operate in the refrigerant pump natural cooling mode.

29. The operation control method according to claim 28, characterized in that: Controlling the first cold source subsystem to operate in a refrigerant pump natural cooling mode specifically includes: Control the condenser module, the compressor bypass valve, and the first refrigerant pump to open, control the compressor and the first refrigerant pump bypass valve to close, and adjust the speed of the first refrigerant pump according to the cooling capacity required for refrigeration; When the chilled water mode is not in the enabled state, controlling the second cold source subsystem to operate in a standby state; When the chilled water mode is in an enabled state, the second cold source subsystem is controlled to operate in the chilled water mode.

30. A motion control device for a multi-cold source air conditioning system, characterized in that: include: An acquisition module is used to obtain indoor temperature, outdoor temperature, indoor and outdoor temperature difference and cooling demand; The processing module is used to control at least one cold source subsystem to operate in a non-standby mode to provide cooling to the evaporator group according to the outdoor temperature, the indoor and outdoor temperature difference and the cooling demand.

31. A controller, characterized in that: include: A processor and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor is used to implement any one of claims 15 to 26 or any one of claims 27 to 29 when executing the computer-executable instructions.

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