Machine room air conditioner and operation control method and operation control device thereof

Abstract

The application provides a machine room air conditioner and a running control method and device thereof. The machine room air conditioner comprises a refrigeration system, a heat recovery system and a controller. The refrigeration system comprises a compressor, a cooling passage of a plate heat exchanger, an expansion valve and an evaporator which are connected in sequence and form a refrigeration cycle loop. The outlet end of the compressor is connected with the air inlet end of the cooling passage of the plate heat exchanger, and the liquid outlet end of the cooling passage of the plate heat exchanger is connected with the air inlet end of the expansion valve. The heat recovery system comprises a heat recovery coil and a heating passage of the plate heat exchanger which are connected in sequence and form a heat recovery loop. The heat recovery coil is located at the return air side of an indoor ventilation passage. The heat recovery coil is arranged at the return air side of the indoor ventilation passage. Since the return air temperature of the machine room is stable and is not affected by the outdoor environment temperature, two-stage heat recovery is carried out by using the heat recovery coil and the plate heat exchanger, stable and effective heat recovery can be carried out throughout the year, and thus the heat recovery efficiency of the machine room air conditioner is improved.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to a computer room air conditioner and its operation control method and operation control device. Background Technology

[0002] With the booming development of the digital economy, data centers are being built on an increasingly large scale. A large number of servers are stored in data centers, and these servers need to operate 24 hours a day without interruption. As a result, they generate huge amounts of electricity, and nearly 90% of the electricity is converted into heat and dissipated. Therefore, it is necessary to recover heat from data centers to improve energy efficiency.

[0003] Data center air conditioning is used to cool the data center to ensure the stable operation of servers. At present, indirect evaporative cooling air conditioning units are becoming more and more widely used because they have natural cooling functions. In winter, these air conditioners usually turn on the natural cooling mode, which can directly use natural cold sources for cooling and thus reduce the energy consumption of the air conditioning. However, if the user has heat recovery needs at this time, since the air conditioner is turned on in the natural cooling mode, it cannot effectively recover the heat in the data center. Summary of the Invention

[0004] This application provides a computer room air conditioner and its operation control method and device, which are used to improve the heat recovery efficiency of the computer room air conditioner.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] In a first aspect, this application provides a computer room air conditioner, including: a refrigeration system, a heat recovery system, and a controller;

[0007] The refrigeration system includes a compressor, a cooling channel of a plate heat exchanger, an expansion valve, and an evaporator connected in sequence to form a refrigeration cycle. The outlet end of the compressor is connected to the inlet end of the cooling channel of the plate heat exchanger, and the liquid outlet end of the cooling channel of the plate heat exchanger is connected to the inlet end of the expansion valve.

[0008] The heat recovery system includes a heat recovery coil and a heating channel of the plate heat exchanger connected in sequence to form a heat recovery loop; wherein the heat recovery coil is located on the return air side of the indoor ventilation channel;

[0009] The controller is connected to both the refrigeration system and the heat recovery system via signals, and the controller is used for:

[0010] The operating modes of the refrigeration system and the heat recovery system are controlled according to the outdoor temperature and heat recovery requirements to adjust the amount of heat recovered.

[0011] Optionally, it may also include a first regulating valve and a second regulating valve;

[0012] The inlet of the heat recovery coil is connected to the return water end and the first end of the first regulating valve, the outlet of the heat recovery coil is connected to the second end of the first regulating valve, the third end of the first regulating valve is connected to the inlet of the heating channel of the plate heat exchanger and the first end of the second regulating valve, the outlet of the heating channel of the plate heat exchanger is connected to the second end of the second regulating valve, and the third end of the second regulating valve is connected to the water supply end.

[0013] The controller is connected to both the first regulating valve and the second regulating valve via signal connections, and the controller is used for:

[0014] Based on the outdoor temperature and heat recovery requirements, the operating states of the first regulating valve and the second regulating valve are controlled respectively to control the operating modes of the refrigeration system and the heat recovery system, thereby adjusting the amount of heat recovered.

[0015] Optionally, an air-to-air heat exchanger may also be included;

[0016] The heat recovery coil, the air-to-air heat exchanger, and the evaporator are arranged sequentially in the indoor ventilation duct along the direction from the return air inlet to the supply air outlet.

[0017] Optional features also include a third regulating valve and a cooling tower;

[0018] The third end of the second regulating valve is connected to the water supply end through the first end and the second end of the third regulating valve. The third end of the third regulating valve is connected to the water inlet end of the cooling tower. The water outlet end of the cooling tower is connected to the water return end.

[0019] The controller is signal-connected to the third regulating valve, and the controller is used for:

[0020] The operating state of the third regulating valve is controlled according to the outdoor temperature and heat recovery requirements to adjust the amount of heat recovery.

[0021] Secondly, this application also provides a method for controlling the operation of a computer room air conditioner, using any of the computer room air conditioners provided in the above technical solutions, wherein the method includes:

[0022] Obtain outdoor temperature and determine heat recovery requirements;

[0023] Based on the outdoor temperature and the heat recovery requirements, the operating modes of the refrigeration system and the heat recovery system are controlled by adjusting the working states of the compressor, the cooling channel of the plate heat exchanger, the expansion valve and the evaporator in the refrigeration system, as well as the working states of the heat recovery coil and the heating channel of the plate heat exchanger in the heat recovery system, so as to adjust the amount of heat recovery.

[0024] Optionally, if the outdoor temperature is greater than or equal to a preset temperature, and the heat recovery requirement is for hot water, then:

[0025] The compressor, cooling channel of plate heat exchanger, expansion valve and evaporator in the refrigeration system are controlled to be in operation, and the heat recovery coil and heating channel of plate heat exchanger in the heat recovery system are controlled to be in operation, so that the refrigeration system operates in compressor refrigeration mode and the heat recovery system operates in first heat recovery mode.

[0026] Optionally, if the outdoor temperature is greater than or equal to a preset temperature, and the heat recovery requirement is no hot water requirement, then:

[0027] The compressor, cooling channel of plate heat exchanger, expansion valve and evaporator in the refrigeration system are controlled to be in operation, and the heating channel of plate heat exchanger in the heat recovery system is controlled to be in operation and the heat recovery coil is controlled to be in dormant, so that the refrigeration system operates in compressor refrigeration mode and the heat recovery system operates in the first non-heat recovery mode.

[0028] Optionally, if the outdoor temperature is lower than the preset temperature, and the heat recovery requirement is for hot water, then:

[0029] The compressor, cooling channel of plate heat exchanger, expansion valve and evaporator in the refrigeration system are controlled to be in a dormant state, and the heat recovery coil in the heat recovery system is controlled to be in an operating state and the heating channel of plate heat exchanger is controlled to be in a dormant state, so that the refrigeration system operates in a non-refrigeration mode and the heat recovery system operates in a second heat recovery mode.

[0030] Optionally, if the outdoor temperature is lower than the preset temperature and the heat recovery requirement is no hot water requirement, then:

[0031] The compressor, cooling channel of plate heat exchanger, expansion valve and evaporator in the refrigeration system are controlled to be in a dormant state, and the heat recovery coil and heating channel of plate heat exchanger in the heat recovery system are controlled to be in a dormant state, so that the refrigeration system operates in a non-refrigeration mode and the heat recovery system operates in a second non-heat recovery mode.

[0032] Thirdly, this application also provides a method for controlling the operation of a computer room air conditioner, using any of the computer room air conditioners provided in the above technical solutions, wherein the method includes:

[0033] Obtain outdoor temperature and determine heat recovery requirements;

[0034] Based on the outdoor temperature and the heat recovery requirements, the operating modes of the refrigeration system and the heat recovery system are controlled to adjust the amount of heat recovered.

[0035] Optionally, controlling the operating modes of the refrigeration system and the heat recovery system according to the outdoor temperature and the heat recovery requirement to adjust the amount of heat recovered includes:

[0036] Based on the outdoor temperature and the heat recovery requirement, the operating modes of the refrigeration system and the heat recovery system are controlled by controlling the working states of the first regulating valve and the second regulating valve, so as to adjust the amount of heat recovery.

[0037] Optionally, after obtaining the outdoor temperature and determining the heat recovery requirements, the method further includes:

[0038] The operating state of the third regulating valve is controlled according to the outdoor temperature and the heat recovery requirement to adjust the amount of heat recovery.

[0039] Optionally, if the outdoor temperature is greater than or equal to a preset temperature, and the heat recovery requirement is for hot water, then:

[0040] The first regulating valve controls the passage between the inlet end of the heating channel of the heat recovery coil and the plate heat exchanger, and the second regulating valve and the third regulating valve control the passage between the outlet end and the supply end of the heating channel of the plate heat exchanger.

[0041] Optionally, if the outdoor temperature is greater than or equal to a preset temperature, and the heat recovery requirement is no hot water requirement, then:

[0042] The first regulating valve controls the passage between the return water end and the inlet end of the heating channel of the plate heat exchanger, and the second regulating valve and the third regulating valve control the passage between the outlet end of the heating channel of the plate heat exchanger and the cooling tower.

[0043] Optionally, if the outdoor temperature is lower than the preset temperature, and the heat recovery requirement is for hot water, then:

[0044] Control the passage between the first regulating valve, the second regulating valve and the third regulating valve that connects the heat recovery coil and the water supply end.

[0045] Optionally, if the outdoor temperature is lower than the preset temperature and the heat recovery requirement is no hot water requirement, then:

[0046] The first regulating valve, the second regulating valve, and the third regulating valve are all closed.

[0047] Fourthly, this application also provides an operation control device for a computer room air conditioner, applied to a computer room air conditioner as described in any of the first aspects, the device comprising:

[0048] The first acquisition unit is used to acquire the outdoor temperature and determine the heat recovery requirements;

[0049] The first control unit is used to control the operating mode of the refrigeration system and the heat recovery system according to the outdoor temperature and the heat recovery requirements, so as to adjust the amount of heat recovery.

[0050] Optionally, the first control unit is specifically used for:

[0051] Based on the outdoor temperature and the heat recovery requirement, the operating modes of the refrigeration system and the heat recovery system are controlled by controlling the working states of the first regulating valve and the second regulating valve, so as to adjust the amount of heat recovery.

[0052] Optionally, the first control unit is further configured to:

[0053] The operating state of the third regulating valve is controlled according to the outdoor temperature and the heat recovery requirement to adjust the amount of heat recovery.

[0054] Optionally, the first control unit is specifically used for:

[0055] If the outdoor temperature is greater than or equal to the preset temperature, and the heat recovery requirement is for hot water, then:

[0056] The first regulating valve controls the passage between the inlet end of the heating channel of the heat recovery coil and the plate heat exchanger, and the second regulating valve and the third regulating valve control the passage between the outlet end and the supply end of the heating channel of the plate heat exchanger.

[0057] Optionally, the first control unit is specifically used for:

[0058] If the outdoor temperature is greater than or equal to the preset temperature, and the heat recovery requirement is no hot water requirement, then:

[0059] The first regulating valve controls the passage between the return water end and the inlet end of the heating channel of the plate heat exchanger, and the second regulating valve and the third regulating valve control the passage between the outlet end of the heating channel of the plate heat exchanger and the cooling tower.

[0060] Optionally, the first control unit is specifically used for:

[0061] If the outdoor temperature is lower than the preset temperature, and the heat recovery requirement is for hot water, then:

[0062] Control the passage between the first regulating valve, the second regulating valve and the third regulating valve that connects the heat recovery coil and the water supply end.

[0063] Optionally, the first control unit is specifically used for:

[0064] If the outdoor temperature is lower than the preset temperature, and the heat recovery requirement is no hot water requirement, then:

[0065] The first regulating valve, the second regulating valve, and the third regulating valve are all closed.

[0066] Fifthly, this application also provides an operation control device for a computer room air conditioner, applied to a computer room air conditioner as described in any of the first aspects, the device comprising:

[0067] The second acquisition unit is used to acquire the outdoor temperature and determine the heat recovery requirements.

[0068] The second control unit is used to control the working mode of the refrigeration system and the heat recovery system according to the outdoor temperature and heat recovery requirements by controlling the working status of the compressor, cooling channel of the plate heat exchanger, expansion valve and evaporator in the refrigeration system, and the working status of the heat recovery coil and heating channel of the plate heat exchanger in the heat recovery system, so as to adjust the amount of heat recovery.

[0069] Optionally, the second control unit is specifically used for:

[0070] If the outdoor temperature is greater than or equal to the preset temperature, and the heat recovery requirement is for hot water, then:

[0071] The compressor, cooling channel of plate heat exchanger, expansion valve and evaporator in the refrigeration system are controlled to be in operation, and the heat recovery coil and heating channel of plate heat exchanger in the heat recovery system are controlled to be in operation, so that the refrigeration system operates in compressor refrigeration mode and the heat recovery system operates in first heat recovery mode.

[0072] Optionally, the second control unit is specifically used for:

[0073] If the outdoor temperature is greater than or equal to the preset temperature, and the heat recovery requirement is no hot water demand, then:

[0074] The compressor, cooling channel of plate heat exchanger, expansion valve and evaporator in the refrigeration system are controlled to be in operation, and the heating channel of plate heat exchanger in the heat recovery system is controlled to be in operation and the heat recovery coil is controlled to be in dormant, so that the refrigeration system operates in compressor refrigeration mode and the heat recovery system operates in the first non-heat recovery mode.

[0075] Optionally, the second control unit is specifically used for:

[0076] If the outdoor temperature is lower than the preset temperature, and the heat recovery requirement is for hot water, then:

[0077] The compressor, cooling channel of plate heat exchanger, expansion valve and evaporator in the refrigeration system are controlled to be in a dormant state, and the heat recovery coil in the heat recovery system is controlled to be in an operating state and the heating channel of plate heat exchanger is controlled to be in a dormant state, so that the refrigeration system operates in a non-refrigeration mode and the heat recovery system operates in a second heat recovery mode.

[0078] Optionally, the second control unit is specifically used for:

[0079] If the outdoor temperature is lower than the preset temperature, and the heat recovery requirement is no hot water demand, then:

[0080] The compressor, cooling channel of plate heat exchanger, expansion valve and evaporator in the refrigeration system are controlled to be in a dormant state, and the heat recovery coil and heating channel of plate heat exchanger in the heat recovery system are controlled to be in a dormant state, so that the refrigeration system operates in a non-refrigeration mode and the heat recovery system operates in a second non-heat recovery mode.

[0081] This application provides a data center air conditioner and its operation control method and device. The data center air conditioner includes a refrigeration system, a heat recovery system, and a controller. The refrigeration system includes a compressor, a cooling channel of a plate heat exchanger, an expansion valve, and an evaporator connected in sequence to form a refrigeration cycle. The outlet end of the compressor is connected to the inlet end of the cooling channel of the plate heat exchanger, and the liquid outlet end of the cooling channel of the plate heat exchanger is connected to the inlet end of the expansion valve. The heat recovery system includes a heat recovery coil and a heating channel of a plate heat exchanger connected in sequence to form a heat recovery cycle. The heat recovery coil is located on the return air side of the indoor ventilation duct. The controller is connected to both the refrigeration system and the heat recovery system. The controller is used to control the operating mode of the refrigeration system and the heat recovery system according to the outdoor temperature and heat recovery requirements to adjust the amount of heat recovery. By installing a heat recovery coil on the return air side of the indoor ventilation duct, since the return air temperature of the data center is stable and unaffected by the outdoor ambient temperature, two-stage heat recovery using the heat recovery coil and the plate heat exchanger can achieve stable and effective heat recovery throughout the year, thereby improving the heat recovery efficiency of the data center air conditioner. Attached Figure Description

[0082] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0083] Figure 1 This is a schematic diagram of the structure of a computer room air conditioner provided in an embodiment of this application;

[0084] Figure 2A schematic diagram of an indoor air-side circulation section and an outdoor air-side circulation section of a computer room air conditioner provided in an embodiment of this application;

[0085] Figure 3 This is a schematic diagram of another computer room air conditioner provided in an embodiment of this application;

[0086] Figure 4 This is a schematic diagram of another computer room air conditioner provided in an embodiment of this application;

[0087] Figure 5 A flowchart illustrating an operation control method for a computer room air conditioner provided in an embodiment of this application;

[0088] Figure 6 A schematic diagram illustrating the operating status of a computer room air conditioner, provided as an embodiment of this application;

[0089] Figure 7 A schematic diagram illustrating the operating status of another data center air conditioner provided in this application embodiment;

[0090] Figure 8 A schematic diagram illustrating the operating status of another data center air conditioner provided in this application embodiment;

[0091] Figure 9 A schematic diagram illustrating the operating status of another data center air conditioner provided in this application embodiment;

[0092] Figure 10 A schematic diagram of the operation control device for a computer room air conditioner provided in an embodiment of this application;

[0093] Figure 11 A flowchart illustrating another method for controlling the operation of a computer room air conditioner provided in this application embodiment;

[0094] Figure 12 A schematic diagram of the operation mode of a computer room air conditioner provided in an embodiment of this application;

[0095] Figure 13 A schematic diagram of another operating mode of a computer room air conditioner provided in an embodiment of this application;

[0096] Figure 14 A schematic diagram of another operating mode of a computer room air conditioner provided in an embodiment of this application;

[0097] Figure 15 A schematic diagram of another operating mode of a computer room air conditioner provided in an embodiment of this application;

[0098] Figure 16 This is a schematic diagram of the operation control device for another computer room air conditioner provided in an embodiment of this application. Detailed Implementation

[0099] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art are within the scope of protection of this application.

[0100] In data centers, air conditioning systems regulate room temperature, maintaining a stable level to ensure smooth server operation. Indirect evaporative cooling (DEC) units are widely used due to their natural cooling mode; however, their heat recovery solutions typically involve water coils on the outdoor exhaust side. A drawback of this approach is that during winter when significant heating is needed, the unit remains in natural cooling mode, hindering effective heat recovery. Another solution uses water-refrigerant heat exchangers instead of air-cooled condensers, but this method has even more significant drawbacks. Not only does it fail to recover heat in winter, but unstable heating demand in summer severely impacts the safe operation of the air conditioning unit, making it a counterproductive approach.

[0101] In other words, current heat recovery solutions for data center air conditioning are not very efficient. In winter, indirect evaporative cooling air conditioning units cannot effectively recover heat because they operate in natural cooling mode. Furthermore, if users require heat recovery during winter, these systems cannot meet their needs. The data center air conditioning system provided in this application can perform heat recovery in all four seasons to meet users' year-round heat recovery requirements.

[0102] like Figure 1 As shown, an embodiment of this application provides a computer room air conditioner, which includes: a refrigeration system, a heat recovery system, and a controller;

[0103] The refrigeration system includes a compressor 101, a cooling channel 102 of a plate heat exchanger, an expansion valve 104, and an evaporator 103 connected in sequence to form a refrigeration cycle. The outlet end of the compressor 101 is connected to the inlet end of the cooling channel 102 of the plate heat exchanger, and the liquid outlet end of the cooling channel 102 of the plate heat exchanger is connected to the inlet end of the expansion valve 104. The plate heat exchanger refers to a plate water-fluorine heat exchanger.

[0104] The heat recovery system includes a heat recovery coil 201 and a plate heat exchanger heating channel 202 connected in sequence to form a heat recovery loop; wherein, the heat recovery coil 201 is located on the return air side of the indoor ventilation channel;

[0105] The controller is connected to the refrigeration system and the heat recovery system respectively. The controller is used to control the working mode of the refrigeration system and the heat recovery system according to the outdoor temperature and heat recovery requirements, so as to adjust the amount of heat recovery.

[0106] The control of the working mode of the refrigeration system and the heat recovery system refers to the control of the operating status of the refrigeration system and the heat recovery system. In this application, it can be achieved in two ways: one is to directly control the working status of each component in the refrigeration system and the heat recovery system, and the other is to add an additional regulating valve and control the state of the regulating valve so that the refrigeration system and the heat recovery system are in different working modes.

[0107] The computer room air conditioner provided in this application embodiment has a heat recovery coil installed on the return air side of the indoor ventilation duct. Since the return air temperature of the computer room is stable and not affected by the outdoor ambient temperature, the heat recovery coil and plate heat exchanger are used for two-stage heat recovery, which can achieve stable and effective heat recovery throughout the year, thereby improving the heat recovery efficiency of the computer room air conditioner.

[0108] Furthermore, the heat recovery coil in this application is arranged on the return air side of the indoor ventilation duct, which can provide some cooling capacity while recovering heat, thereby improving the operating efficiency of the computer room air conditioner. Since the quality of the recoverable heat from the return air temperature in the computer room is relatively low, this application uses a plate-type water-fluoride heat exchanger of the compressor system for secondary recovery, which can expand the application range of the recovered hot water. Moreover, while recovering heat, it can also cool the high-temperature and high-pressure exhaust gas of the compressor, thereby improving the operating efficiency of the computer room air conditioner.

[0109] In the refrigeration system, compressor 101 outputs high-temperature, high-pressure gaseous refrigerant (e.g., fluorinated refrigerant), which exchanges heat with water in the heating channel 202 of the plate heat exchanger after passing through the cooling channel 102. This results in the output of medium-temperature, high-pressure liquid refrigerant. The medium-temperature, high-pressure liquid refrigerant then passes through expansion valve 104 and becomes low-temperature, low-pressure wet vapor. After passing through evaporator 103, it absorbs heat and vaporizes, becoming low-temperature, low-pressure gaseous refrigerant, which is then reintroduced into compressor 101, thus forming a refrigeration cycle. In the heat recovery system, water entering from the return water end can first exchange heat with indoor return air through heat recovery coil 201 for the first stage of heat recovery. Then, it can enter the heating channel 202 of the plate heat exchanger to exchange heat with refrigerant for the second stage of heat recovery, thereby obtaining hot water at the supply water end for user use.

[0110] This application uses a plate-type water-fluorine heat exchanger to replace the traditional air-cooled condenser, which can effectively reduce the condensing temperature, thereby improving the circulation efficiency of the compressor refrigeration cycle system. It can also reduce the wind resistance of the outdoor fan of the computer room air conditioner and reduce the power of the outdoor fan, thereby improving the operating efficiency of the computer room air conditioner.

[0111] The indoor air-side circulation section and the outdoor air-side circulation section of the computer room air conditioner provided in the embodiments of this application are described below:

[0112] like Figure 2 The diagram described is a schematic representation of the indoor and outdoor air-side circulation sections of the computer room air conditioner provided in this embodiment. The heat recovery coil, air-to-air heat exchanger, and evaporator are arranged sequentially within the indoor ventilation duct, pointing from the return air inlet to the supply air outlet; that is, arranged sequentially from the indoor return air side to the indoor exhaust air side. The airflow organization of the indoor air-side circulation section is as follows: the computer room return air first enters the heat recovery water coil, then the air-to-air heat exchanger, and finally passes through the evaporator before being delivered into the computer room. The airflow organization of the outdoor air-side circulation section is as follows: outdoor intake air passes through the air-to-air heat exchanger and is directly discharged to the outdoor atmosphere.

[0113] It is worth noting that airflow organization patterns are not limited to Figure 2 As shown, the air-to-air heat exchanger can be arranged at any angle, and the heat recovery water coil can also be arranged in a different row than the air-to-air heat exchanger and evaporator. The indoor and outdoor fans are not limited to blowing or suction types and can be adjusted according to actual needs.

[0114] In specific implementation, such as Figure 3 As shown, the computer room air conditioner provided in this application embodiment may further include a first regulating valve T1 and a second regulating valve T2; the inlet end of the heat recovery coil 201 is connected to the return end and the first end of the first regulating valve T1 respectively, the outlet end of the heat recovery coil 201 is connected to the second end of the first regulating valve T1, the third end of the first regulating valve T1 is connected to the inlet end of the heating channel 202 of the plate heat exchanger and the first end of the second regulating valve T2 respectively, the outlet end of the heating channel 202 of the plate heat exchanger is connected to the second end of the second regulating valve T2, and the third end of the second regulating valve T2 is connected to the water supply end;

[0115] The controller is connected to the first regulating valve T1 and the second regulating valve T2 via signals. The controller is used for:

[0116] Based on the outdoor temperature and heat recovery requirements, the operating states of the first regulating valve T1 and the second regulating valve T2 are controlled respectively to control the operating modes of the refrigeration system and the heat recovery system, thereby adjusting the amount of heat recovered.

[0117] In specific implementation, such as Figure 4As shown, the air conditioner for the computer room provided in this embodiment may further include a third regulating valve T3 and a cooling tower 203; the third end of the second regulating valve T2 is connected to the water supply end through the first end and the second end of the third regulating valve T3, the third end of the third regulating valve T3 is connected to the water inlet end of the cooling tower 203, and the water outlet end of the cooling tower 203 is connected to the water return end; the controller is signal-connected to the third regulating valve T3, and the controller is used to: control the working state of the third regulating valve T3 according to the outdoor temperature and heat recovery requirements, so as to adjust the amount of heat recovery.

[0118] The first, second, and third regulating valves provided in this application embodiment can specifically be three-way valves. Of course, other valves with regulating functions can also be used, such as multiple two-way water valves or other valves, as long as the water flow path can be switched. Furthermore... Figure 4 The cooling source is not limited to a cooling tower; it can also be a chiller or other external cold source.

[0119] Based on the same concept, this application also provides a method for controlling the operation of a computer room air conditioner, such as... Figure 5 As shown, using any of the computer room air conditioners provided in the above technical solutions, the operation control method includes:

[0120] S501, Obtain outdoor temperature and determine heat recovery requirements;

[0121] S502. Based on the outdoor temperature and heat recovery requirements, control the operating mode of the refrigeration system and the heat recovery system to adjust the amount of heat recovered.

[0122] In the operation control method of the computer room air conditioner provided in this application embodiment, the outdoor temperature is first obtained and the heat recovery demand is determined. Then, based on the outdoor temperature and the heat recovery demand, the working mode of the refrigeration system and the heat recovery system is controlled to adjust the amount of heat recovery. Stable and effective heat recovery can be carried out throughout the year, thereby improving the heat recovery efficiency of the air conditioner.

[0123] It is worth noting that heat recovery demand refers to the user's demand for hot water. Cold water is heated to become domestic hot water or heating water. For example, staff in a data center need domestic water every day. The large number of staff results in a large demand for hot water, and the demand for hot water varies in each season. The data center air conditioner in this embodiment can determine the user's heat recovery demand and operate in different modes according to the outdoor temperature and heat recovery demand, thereby maximizing the resource utilization of the data center air conditioning system.

[0124] The heat recovery requirement in this application can be triggered by the user. Two heat recovery requirement modes can be preset, such as having heat recovery requirement and not having heat recovery requirement. The user can choose which mode to use. Then, the computer room air conditioner controls the working mode of the cooling system and the heat recovery system according to the outdoor temperature to adjust the amount of heat recovery. Stable and effective heat recovery can be carried out throughout the year, thereby improving the heat recovery efficiency of the air conditioner.

[0125] In practical implementation, this application can control the operating mode of the refrigeration system and the heat recovery system by controlling the working states of the first and second regulating valves according to the outdoor temperature and heat recovery requirements, thereby adjusting the amount of heat recovery. After obtaining the outdoor temperature and determining the heat recovery requirements, the operating state of the third regulating valve can also be controlled according to the outdoor temperature and heat recovery requirements to adjust the amount of heat recovery.

[0126] In some embodiments, if the outdoor temperature is greater than or equal to the preset temperature and the heat recovery demand is for hot water, then: control the passage between the first regulating valve T1 and the inlet end of the heating channel 202 of the heat recovery coil 201 and the plate heat exchanger, and control the passage between the outlet end and the supply end of the heating channel 202 of the plate heat exchanger connected by the second regulating valve T2 and the third regulating valve T3.

[0127] Specifically, such as Figure 6 As shown in the diagram, solid lines represent passages through which water can flow, while dashed lines represent passages that are blocked and cannot flow through. The water entering the return water inlet first passes through the heat recovery coil 201 and exchanges heat with the indoor return air to complete the first stage of heat recovery. Then, it enters the heating channel 202 of the plate heat exchanger and exchanges heat with the exhaust gas from the compressor 101 for the second stage of heat recovery. Finally, it flows out from the supply water inlet.

[0128] In some embodiments, if the outdoor temperature is greater than or equal to the preset temperature and the heat recovery requirement is no hot water requirement, then: control the passage between the first regulating valve T1 and the inlet of the heating channel 202 of the plate heat exchanger, and control the passage between the outlet of the heating channel 202 of the plate heat exchanger and the cooling tower 203 of the second regulating valve T2 and the third regulating valve T3.

[0129] Specifically, such as Figure 7 As shown, the return water enters the heating channel 202 of the plate heat exchanger directly after passing through the first regulating valve T1. The purpose is to cool the high-temperature and high-pressure exhaust gas of the compressor 101, that is, to cool the high-temperature and high-pressure gaseous refrigerant in the cooling channel 102 of the plate heat exchanger. Then, it passes through the second regulating valve T2 and the third regulating valve T3 in sequence and enters the cooling tower 203 to cool the hot water. The water cooled by the cooling tower 203 re-enters the heat recovery system. Here, it flows through the first regulating valve T1 again into the heating channel 202 of the plate heat exchanger to exchange heat with the refrigerant in the cooling channel 102 of the plate heat exchanger to increase the cooling capacity.

[0130] In some embodiments, if the outdoor temperature is lower than the preset temperature and the heat recovery demand is for hot water, then: control the passage between the heat recovery coil 201 and the water supply end by controlling the first regulating valve T1, the second regulating valve T2 and the third regulating valve T3.

[0131] Specifically, such as Figure 8 As shown, after the return water enters through the heat recovery coil 201 and exchanges heat with the indoor return air to complete heat recovery, it flows through the first regulating valve T1, the second regulating valve T2 and the third regulating valve T3 in sequence, and flows directly out from the water supply end. The refrigeration cycle system of the compressor 101 is not turned on, that is, the refrigeration system is not turned on, and the air-to-air heat exchanger supplements the refrigeration capacity.

[0132] In some embodiments, if the outdoor temperature is lower than the preset temperature and the heat recovery demand is no hot water demand, then: the first regulating valve T1, the second regulating valve T2 and the third regulating valve T3 are all closed.

[0133] Specifically, such as Figure 9 As shown, at this time, both the refrigeration system and the heat recovery system are shut down, and only the air-to-air heat exchanger is used to provide refrigeration.

[0134] The above scenarios cover the year-round operation of the data center air conditioning system. The water-side heat recovery system uses a three-way valve to adjust the flow path and switch modes. All of these scenarios ensure the safe operation and cooling output of the air conditioning system, and provide stable and effective heat recovery when heating is needed. Furthermore, since the first-stage heat recovery occurs indoors, it also provides some cooling capacity to the data center while recovering heat, reducing the annual energy consumption of the data center air conditioning system.

[0135] Based on the same concept, embodiments of this application also provide an operation control device for a computer room air conditioner, such as... Figure 10 As shown, it includes:

[0136] The first acquisition unit 1001 is used to acquire the outdoor temperature and determine the heat recovery requirements;

[0137] The first control unit 1002 is used to control the working mode of the refrigeration system and the heat recovery system according to the outdoor temperature and heat recovery requirements, so as to adjust the amount of heat recovery.

[0138] In some embodiments, the first control unit 1002 is specifically used for:

[0139] Based on the outdoor temperature and heat recovery requirements, the working modes of the refrigeration system and the heat recovery system are controlled by adjusting the working states of the first and second regulating valves, thereby adjusting the amount of heat recovered.

[0140] In some embodiments, the first control unit 1002 is further configured to:

[0141] The operating status of the third regulating valve is controlled according to the outdoor temperature and heat recovery requirements to adjust the amount of heat recovery.

[0142] In some embodiments, the first control unit 1002 is specifically used for:

[0143] If the outdoor temperature is greater than or equal to the preset temperature, and the heat recovery requirement is for hot water, then:

[0144] The first regulating valve controls the passage between the inlet end of the heating channel of the heat recovery coil and the plate heat exchanger, and the second and third regulating valves control the passage between the outlet end and the supply end of the heating channel of the plate heat exchanger.

[0145] In some embodiments, the first control unit 1002 is specifically used for:

[0146] If the outdoor temperature is greater than or equal to the preset temperature, and the heat recovery requirement is no hot water demand, then:

[0147] The first regulating valve controls the passage between the return water end and the inlet end of the heating channel of the plate heat exchanger, and the second and third regulating valves control the passage between the outlet end of the heating channel of the plate heat exchanger and the cooling tower.

[0148] In some embodiments, the first control unit 1002 is specifically used for:

[0149] If the outdoor temperature is lower than the preset temperature, and the heat recovery requirement is for hot water, then:

[0150] Control the passage between the heat recovery coil and the water supply end by controlling the first regulating valve, the second regulating valve and the third regulating valve.

[0151] In some embodiments, the first control unit 1002 is specifically used for:

[0152] If the outdoor temperature is lower than the preset temperature, and the heat recovery requirement is no hot water demand, then:

[0153] The first regulating valve, the second regulating valve, and the third regulating valve are all closed.

[0154] Based on the same concept, this application also provides a method for controlling the operation of a computer room air conditioner, such as... Figure 11 As shown, using any of the computer room air conditioners provided in the above technical solutions, the operation control method includes:

[0155] S1101. Obtain outdoor temperature and determine heat recovery requirements;

[0156] S1102. Based on the outdoor temperature and heat recovery requirements, the working status of the compressor, the cooling channel of the plate heat exchanger, the expansion valve and the evaporator in the refrigeration system, and the heating channel of the heat recovery coil and the plate heat exchanger in the heat recovery system are controlled to adjust the amount of heat recovery.

[0157] It is worth noting that the air-to-air heat exchanger in this application is always in operation under various modes, thereby ensuring the cooling capacity.

[0158] In some embodiments, such as Figure 12 As shown, if the outdoor temperature is greater than or equal to the preset temperature and the heat recovery demand is for hot water, then: the compressor 101, the cooling channel 102 of the plate heat exchanger, the expansion valve 104 and the evaporator 103 in the refrigeration system are controlled to be in operation, and the heat recovery coil 201 and the heating channel 202 of the plate heat exchanger in the heat recovery system are controlled to be in operation, so that the refrigeration system works in the compressor refrigeration mode and the heat recovery system works in the first heat recovery mode.

[0159] In some embodiments, such as Figure 13 As shown, if the outdoor temperature is greater than or equal to the preset temperature and the heat recovery demand is no hot water demand, then: the compressor 101, the cooling channel 102 of the plate heat exchanger, the expansion valve 104 and the evaporator 103 in the refrigeration system are controlled to be in the operating state, the heating channel 202 of the plate heat exchanger in the heat recovery system is controlled to be in the operating state, and the heat recovery coil 201 is in the dormant state, so that the refrigeration system works in the compressor refrigeration mode and the heat recovery system works in the first non-heat recovery mode.

[0160] In some embodiments, such as Figure 14 As shown, if the outdoor temperature is lower than the preset temperature and the heat recovery demand is for hot water, then: the compressor 101, the cooling channel 102 of the plate heat exchanger, the expansion valve 104 and the evaporator 103 in the refrigeration system are put into a dormant state, the heat recovery coil 201 in the heat recovery system is put into an operating state and the heating channel 202 of the plate heat exchanger is put into a dormant state, so that the refrigeration system works in a non-refrigeration mode and the heat recovery system works in the second heat recovery mode.

[0161] In some embodiments, such as Figure 15 As shown, if the outdoor temperature is lower than the preset temperature and the heat recovery demand is no hot water demand, then: the compressor 101, the cooling channel 102 of the plate heat exchanger, the expansion valve 104 and the evaporator 103 in the refrigeration system are put into a dormant state, and the heat recovery coil 201 and the heating channel 202 of the plate heat exchanger in the heat recovery system are put into a dormant state, so that the refrigeration system works in a non-refrigeration mode and the heat recovery system works in a second non-heat recovery mode.

[0162] Based on the same concept, embodiments of this application also provide an operation control device for a computer room air conditioner, such as... Figure 16 As shown, it includes:

[0163] The second acquisition unit 1601 is used to acquire the outdoor temperature and determine the heat recovery requirements;

[0164] The second control unit 1602 is used to control the working mode of the refrigeration system and the heat recovery system according to the outdoor temperature and heat recovery requirements by controlling the working status of the compressor, the cooling channel of the plate heat exchanger, the expansion valve and the evaporator in the refrigeration system, and the working status of the heat recovery coil and the heating channel of the plate heat exchanger in the heat recovery system, so as to adjust the amount of heat recovery.

[0165] In some embodiments, the second control unit 1602 is specifically used for:

[0166] If the outdoor temperature is greater than or equal to the preset temperature, and the heat recovery requirement is for hot water, then:

[0167] The compressor, cooling channel of plate heat exchanger, expansion valve and evaporator in the refrigeration system are controlled to be in operation, and the heat recovery coil and heating channel of plate heat exchanger in the heat recovery system are controlled to be in operation, so that the refrigeration system works in compressor refrigeration mode and the heat recovery system works in first heat recovery mode.

[0168] In some embodiments, the second control unit 1602 is specifically used for:

[0169] If the outdoor temperature is greater than or equal to the preset temperature, and the heat recovery requirement is no hot water demand, then:

[0170] The compressor, cooling channel of plate heat exchanger, expansion valve and evaporator in the refrigeration system are controlled to be in operation, and the heating channel of plate heat exchanger in the heat recovery system is controlled to be in operation and the heat recovery coil is in dormancy, so that the refrigeration system works in compressor refrigeration mode and the heat recovery system works in the first non-heat recovery mode.

[0171] In some embodiments, the second control unit 1602 is specifically used for:

[0172] If the outdoor temperature is lower than the preset temperature, and the heat recovery requirement is for hot water, then:

[0173] The compressor, cooling channel of plate heat exchanger, expansion valve and evaporator in the refrigeration system are kept in a dormant state, and the heat recovery coil in the heat recovery system is kept in an operating state and the heating channel of plate heat exchanger is kept in a dormant state, so that the refrigeration system works in a non-refrigeration mode and the heat recovery system works in a second heat recovery mode.

[0174] In some embodiments, the second control unit 1602 is specifically used for:

[0175] If the outdoor temperature is lower than the preset temperature, and the heat recovery requirement is no hot water demand, then:

[0176] The compressor, cooling channel of plate heat exchanger, expansion valve and evaporator in the refrigeration system are kept in a dormant state, and the heat recovery coil and heating channel of plate heat exchanger in the heat recovery system are kept in a dormant state, so that the refrigeration system works in a non-refrigeration mode and the heat recovery system works in a second non-heat recovery mode.

[0177] This application provides a data center air conditioner and its operation control method and device. The data center air conditioner includes a refrigeration system, a heat recovery system, and a controller. The refrigeration system includes a compressor, a cooling channel of a plate heat exchanger, an expansion valve, and an evaporator connected in sequence to form a refrigeration cycle. The outlet end of the compressor is connected to the inlet end of the cooling channel of the plate heat exchanger, and the liquid outlet end of the cooling channel of the plate heat exchanger is connected to the inlet end of the expansion valve. The heat recovery system includes a heat recovery coil and a heating channel of a plate heat exchanger connected in sequence to form a heat recovery cycle. The heat recovery coil is located on the return air side of the indoor ventilation duct. The controller is connected to both the refrigeration system and the heat recovery system. The controller is used to control the operating mode of the refrigeration system and the heat recovery system according to the outdoor temperature and heat recovery requirements to adjust the amount of heat recovery. By installing a heat recovery coil on the return air side of the indoor ventilation duct, since the return air temperature of the data center is stable and unaffected by the outdoor ambient temperature, two-stage heat recovery using the heat recovery coil and the plate heat exchanger can achieve stable and effective heat recovery throughout the year, thereby improving the heat recovery efficiency of the data center air conditioner.

[0178] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0179] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to this application. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0180] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0181] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0182] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A computer room air conditioner, characterized in that, include: Refrigeration system, heat recovery system, and controller; The refrigeration system includes a compressor, a cooling channel of a plate heat exchanger, an expansion valve, and an evaporator connected in sequence to form a refrigeration cycle. The outlet end of the compressor is connected to the inlet end of the cooling channel of the plate heat exchanger, and the liquid outlet end of the cooling channel of the plate heat exchanger is connected to the inlet end of the expansion valve. The heat recovery system includes a heat recovery coil and a heating channel of the plate heat exchanger connected in sequence to form a heat recovery loop; wherein the heat recovery coil is located on the return air side of the indoor ventilation channel; The controller is connected to both the refrigeration system and the heat recovery system via signals, and the controller is used for: Based on the outdoor temperature and heat recovery requirements, control the operating modes of the refrigeration system and the heat recovery system to adjust the amount of heat recovered. This also includes a first regulating valve and a second regulating valve; The inlet of the heat recovery coil is connected to the return water end and the first end of the first regulating valve, the outlet of the heat recovery coil is connected to the second end of the first regulating valve, the third end of the first regulating valve is connected to the inlet of the heating channel of the plate heat exchanger and the first end of the second regulating valve, the outlet of the heating channel of the plate heat exchanger is connected to the second end of the second regulating valve, and the third end of the second regulating valve is connected to the water supply end. The controller is connected to both the first regulating valve and the second regulating valve via signal connections, and the controller is used for: Based on the outdoor temperature and heat recovery requirements, the working states of the first regulating valve and the second regulating valve are controlled respectively to control the working mode of the refrigeration system and the heat recovery system, so as to adjust the amount of heat recovery. This also includes a third regulating valve and a cooling tower; The third end of the second regulating valve is connected to the water supply end through the first end and the second end of the third regulating valve. The third end of the third regulating valve is connected to the water inlet end of the cooling tower. The water outlet end of the cooling tower is connected to the water return end. The controller is signal-connected to the third regulating valve, and the controller is used for: The operating state of the third regulating valve is controlled according to the outdoor temperature and heat recovery requirements to adjust the amount of heat recovery.

2. The computer room air conditioner as described in claim 1, characterized in that, This also includes air-to-air heat exchangers; The heat recovery coil, the air-to-air heat exchanger, and the evaporator are arranged sequentially in the indoor ventilation duct along the direction from the return air inlet to the supply air outlet.

3. A method for controlling the operation of a computer room air conditioner, characterized in that, Applied to the computer room air conditioner as described in any one of claims 1-2, the method includes: Obtain outdoor temperature and determine heat recovery requirements; Based on the outdoor temperature and the heat recovery requirements, the operating modes of the refrigeration system and the heat recovery system are controlled by adjusting the working states of the compressor, the cooling channel of the plate heat exchanger, the expansion valve and the evaporator in the refrigeration system, as well as the working states of the heat recovery coil and the heating channel of the plate heat exchanger in the heat recovery system, so as to adjust the amount of heat recovery.

4. The method as described in claim 3, characterized in that, If the outdoor temperature is greater than or equal to the preset temperature, and the heat recovery requirement is for hot water, then: The compressor, cooling channel of plate heat exchanger, expansion valve and evaporator in the refrigeration system are controlled to be in operation, and the heat recovery coil and heating channel of plate heat exchanger in the heat recovery system are controlled to be in operation, so that the refrigeration system operates in compressor refrigeration mode and the heat recovery system operates in first heat recovery mode.

5. The method as described in claim 3, characterized in that, If the outdoor temperature is greater than or equal to the preset temperature, and the heat recovery requirement is no hot water requirement, then: The compressor, cooling channel of plate heat exchanger, expansion valve and evaporator in the refrigeration system are controlled to be in operation, and the heating channel of plate heat exchanger in the heat recovery system is controlled to be in operation and the heat recovery coil is controlled to be in dormant, so that the refrigeration system operates in compressor refrigeration mode and the heat recovery system operates in the first non-heat recovery mode.

6. The method as described in claim 3, characterized in that, If the outdoor temperature is lower than the preset temperature, and the heat recovery requirement is for hot water, then: The compressor, cooling channel of plate heat exchanger, expansion valve and evaporator in the refrigeration system are controlled to be in a dormant state, and the heat recovery coil in the heat recovery system is controlled to be in an operating state and the heating channel of plate heat exchanger is controlled to be in a dormant state, so that the refrigeration system operates in a non-refrigeration mode and the heat recovery system operates in a second heat recovery mode.

7. The method as described in claim 3, characterized in that, If the outdoor temperature is lower than the preset temperature, and the heat recovery requirement is no hot water requirement, then: The compressor, cooling channel of plate heat exchanger, expansion valve and evaporator in the refrigeration system are controlled to be in a dormant state, and the heat recovery coil and heating channel of plate heat exchanger in the heat recovery system are controlled to be in a dormant state, so that the refrigeration system operates in a non-refrigeration mode and the heat recovery system operates in a second non-heat recovery mode.

8. A method for controlling the operation of a computer room air conditioner, characterized in that, Applied to the computer room air conditioner as described in any one of claims 1-2, the method includes: Obtain outdoor temperature and determine heat recovery requirements; Based on the outdoor temperature and the heat recovery requirements, the operating modes of the refrigeration system and the heat recovery system are controlled to adjust the amount of heat recovered.

9. The method as described in claim 8, characterized in that, The step of controlling the operating modes of the refrigeration system and the heat recovery system according to the outdoor temperature and the heat recovery requirement to adjust the amount of heat recovered includes: Based on the outdoor temperature and the heat recovery requirement, the operating modes of the refrigeration system and the heat recovery system are controlled by controlling the working states of the first regulating valve and the second regulating valve, so as to adjust the amount of heat recovery.

10. The method as described in claim 8 or 9, characterized in that, After obtaining the outdoor temperature and determining the heat recovery requirements, the process also includes: The operating state of the third regulating valve is controlled according to the outdoor temperature and the heat recovery requirement to adjust the amount of heat recovery.

11. The method as described in claim 10, characterized in that, If the outdoor temperature is greater than or equal to the preset temperature, and the heat recovery requirement is for hot water, then: The first regulating valve controls the passage between the inlet end of the heating channel of the heat recovery coil and the plate heat exchanger, and the second regulating valve and the third regulating valve control the passage between the outlet end and the supply end of the heating channel of the plate heat exchanger.

12. The method as described in claim 9, characterized in that, If the outdoor temperature is greater than or equal to the preset temperature, and the heat recovery requirement is no hot water requirement, then: The first regulating valve controls the passage between the return water end and the inlet end of the heating channel of the plate heat exchanger, and the second regulating valve and the third regulating valve control the passage between the outlet end of the heating channel of the plate heat exchanger and the cooling tower.

13. The method as described in claim 10, characterized in that, If the outdoor temperature is lower than the preset temperature, and the heat recovery requirement is for hot water, then: Control the passage between the first regulating valve, the second regulating valve and the third regulating valve that connects the heat recovery coil and the water supply end.

14. The method as described in claim 10, characterized in that, If the outdoor temperature is lower than the preset temperature, and the heat recovery requirement is no hot water requirement, then: The first regulating valve, the second regulating valve, and the third regulating valve are all closed.

15. An operation control device for a computer room air conditioner, characterized in that, The device, applied to the computer room air conditioner as described in any one of claims 1-2, comprises: The first acquisition unit is used to acquire the outdoor temperature and determine the heat recovery requirements; The first control unit is used to control the operating mode of the refrigeration system and the heat recovery system according to the outdoor temperature and the heat recovery requirements, so as to adjust the amount of heat recovery.

16. The apparatus as claimed in claim 15, characterized in that, The first control unit is specifically used for: Based on the outdoor temperature and the heat recovery requirement, the operating modes of the refrigeration system and the heat recovery system are controlled by controlling the working states of the first regulating valve and the second regulating valve, so as to adjust the amount of heat recovery.

17. The apparatus as claimed in claim 15 or 16, characterized in that, The first control unit is also used for: The operating state of the third regulating valve is controlled according to the outdoor temperature and the heat recovery requirement to adjust the amount of heat recovery.

18. The apparatus as claimed in claim 17, characterized in that, The first control unit is specifically used for: If the outdoor temperature is greater than or equal to the preset temperature, and the heat recovery requirement is for hot water, then: The first regulating valve controls the passage between the inlet end of the heating channel of the heat recovery coil and the plate heat exchanger, and the second regulating valve and the third regulating valve control the passage between the outlet end and the supply end of the heating channel of the plate heat exchanger.

19. The apparatus as claimed in claim 17, characterized in that, The first control unit is specifically used for: If the outdoor temperature is greater than or equal to the preset temperature, and the heat recovery requirement is no hot water requirement, then: The first regulating valve controls the passage between the return water end and the inlet end of the heating channel of the plate heat exchanger, and the second regulating valve and the third regulating valve control the passage between the outlet end of the heating channel of the plate heat exchanger and the cooling tower.

20. The apparatus as claimed in claim 17, characterized in that, The first control unit is specifically used for: If the outdoor temperature is lower than the preset temperature, and the heat recovery requirement is for hot water, then: Control the passage between the first regulating valve, the second regulating valve and the third regulating valve that connects the heat recovery coil and the water supply end.

21. The apparatus as claimed in claim 17, characterized in that, The first control unit is specifically used for: If the outdoor temperature is lower than the preset temperature, and the heat recovery requirement is no hot water requirement, then: The first regulating valve, the second regulating valve, and the third regulating valve are all closed.

Images