Dual cold source air conditioner and control method

Abstract

This application discloses a dual-source air conditioner and its control method, relating to the field of computer room air conditioning technology. The dual-source air conditioner includes: a chilled fluid coil; a liquid cooling system for supplying chilled fluid; and a compression refrigeration system, including a heat release channel for releasing heat from the throttled refrigerant and a heat absorption channel for absorbing heat from the refrigerant after compression by the compressor. The inlet of the heat release channel is optionally connected to the outlet of the liquid cooling system or the outlet of the chilled fluid coil, and the outlet of the heat release channel is optionally connected to the inlet of the chilled fluid coil. The inlet of the heat absorption channel is optionally connected to the outlet of the liquid cooling system or the outlet of the chilled fluid coil, and the outlet of the heat absorption channel is optionally connected to the inlet of the liquid cooling system. This application can utilize the cooling medium in the liquid cooling system to remove heat from the condenser end of the compression refrigeration system, thereby improving the heat exchange effect at the condenser end.

Description

Technical Field

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

[0002] Dual-source air conditioning systems typically employ a parallel configuration of a liquid cooling system and a compressor refrigeration system. Both systems can independently provide sufficient cooling capacity to the data center, ensuring the reliability of the dual-source air conditioning system.

[0003] In the process of realizing this invention, the inventors discovered that the prior art has at least the following problems:

[0004] During the process of providing cooling capacity in a compressor refrigeration system (compressor mode), the condenser end of the compressor refrigeration system needs to exchange heat with the external environment. However, when the ambient temperature is too high or the ventilation around the condenser end is poor, the heat exchange effect between the condenser end and the external environment will be poor, thereby increasing the condensing pressure, resulting in increased compressor energy consumption and wasting power resources.

[0005] Therefore, in view of the above-mentioned technical problems, how to improve the heat exchange effect at the condenser end of the compressor refrigeration system is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of this application is to provide a dual-source air conditioner and control method, which can use the cooling medium in the liquid cooling system to remove heat from the condenser end of the compressor refrigeration system, thereby improving the heat exchange effect at the condenser end.

[0007] To achieve the above objectives, this application provides a dual-cooling-source air conditioner, comprising:

[0008] Refrigeration fluid coils;

[0009] Liquid cooling systems are used to supply refrigerant fluids;

[0010] A compression refrigeration system includes a heat release channel for releasing heat from the refrigerant after throttling and a heat absorption channel for absorbing heat from the refrigerant after compression by the compressor; wherein, the liquid inlet of the heat release channel is optionally connected to the liquid outlet of the liquid cooling system or the liquid outlet of the refrigeration fluid coil, and the liquid outlet of the heat release channel is optionally connected to the liquid inlet of the refrigeration fluid coil; the liquid inlet of the heat absorption channel is optionally connected to the liquid outlet of the liquid cooling system or the liquid outlet of the refrigeration fluid coil, and the liquid outlet of the heat absorption channel is optionally connected to the liquid inlet of the liquid cooling system;

[0011] The controller is used to control the liquid outlet of the liquid cooling system, the heat release channel, the refrigerant coil, the heat receiving channel, and the liquid inlet of the liquid cooling system to be connected sequentially in a first working state; and to control the liquid outlet of the liquid cooling system, the heat receiving channel, and the liquid inlet of the liquid cooling system to be connected sequentially in a second working state, wherein the two ends of the heat release channel are respectively connected to the two ends of the refrigerant coil.

[0012] Preferably, the compression refrigeration system includes an evaporator, a condenser, a compressor, and an expansion valve. The evaporator includes an evaporating-side refrigerant channel that exchanges heat with the heat release channel, and the condenser includes a condensing-side refrigerant channel that exchanges heat with the heat receiving channel. The compressor, the condensing-side refrigerant channel, the expansion valve, and the evaporating-side refrigerant channel are sequentially and cyclically connected.

[0013] Preferably, the liquid outlet of the liquid cooling system is connected to one end of the third main control valve and the first end of the first three-way valve, the second end of the first three-way valve is connected to one end of the second bypass valve, the other end of the second bypass valve is connected to the liquid inlet of the heat release channel, the liquid outlet of the heat release channel is connected to the liquid inlet of the refrigerant coil, the liquid outlet of the refrigerant coil is connected to the second end of the second three-way valve, the first end of the second three-way valve is connected to the other end of the third main control valve and the liquid inlet of the heat receiving channel, the liquid outlet of the heat receiving channel is connected to one end of the first bypass valve, and the other end of the first bypass valve is connected to the liquid inlet of the liquid cooling system.

[0014] In the first working state, the third main control valve is closed, the first and second ends of the first three-way valve are open, the second bypass valve is open, the first and second ends of the second three-way valve are open, and the first bypass valve is open.

[0015] In the second operating state, the third main control valve is turned on, the second and third ends of the first three-way valve are turned on, the second bypass valve is turned on, the second and third ends of the second three-way valve are turned on, and the first bypass valve is turned on.

[0016] Preferably, a circulation pump is provided between the third end of the first three-way valve and the third end of the second three-way valve.

[0017] Preferably, the second end of the first three-way valve is also connected to one end of the second main control valve, and the other end of the second main control valve is connected to the liquid outlet of the heat release channel and the liquid inlet of the refrigerant coil;

[0018] The second end of the second three-way valve is also connected to one end of the first main control valve, and the other end of the first main control valve is connected to the other end of the first bypass valve and the liquid inlet of the liquid cooling system; in the first working state, the second main control valve is closed and the first main control valve is closed; in the second working state, the second main control valve is closed and the first main control valve is closed.

[0019] Preferably, the system further includes a temperature sensor and a pressure sensor, wherein the temperature sensor and / or the pressure sensor are located at the liquid inlet and outlet of the liquid cooling system, the liquid inlet and outlet of the heat dissipation channel, and the liquid inlet and outlet of the heat receiving channel.

[0020] A control method, applied to the aforementioned dual-source air conditioner, includes:

[0021] Determine the current work status;

[0022] In the first working state, the compression refrigeration system is turned on, and the liquid outlet, heat release channel, refrigerant coil, heating channel and liquid inlet of the liquid cooling system are connected in sequence.

[0023] In the second working state, the compression refrigeration system is turned on, and the liquid outlet of the liquid cooling system, the heating channel and the liquid inlet of the liquid cooling system are connected in sequence, and the two ends of the heat release channel are respectively connected to the two ends of the refrigerant coil.

[0024] Preferably, it further includes:

[0025] In the third operating state, the compression refrigeration system is shut down, and the liquid outlet of the liquid cooling system, the refrigerant coil, and the liquid inlet of the liquid cooling system are connected in sequence.

[0026] Preferably, determining the current working status includes:

[0027] Obtain the preset inlet temperature of the refrigerant coil and the current outlet temperature of the liquid cooling system;

[0028] If the preset inlet temperature is lower than the outlet temperature of the liquid cooling system, the return air temperature of the computer room is obtained under full power operation of the liquid cooling system. If the outlet temperature of the liquid cooling system is less than or equal to the return air temperature of the computer room, the compression refrigeration system is controlled to start, and it is determined whether the refrigeration frequency of the compression refrigeration system is less than the refrigeration frequency of the liquid cooling system. If so, the current state is determined to be the first working state; otherwise, the current state is determined to be the second working state.

[0029] If the preset inlet temperature is greater than or equal to the outlet temperature of the liquid cooling system, then the current state is determined to be the third working state.

[0030] A computer-readable storage medium for storing a computer program that, when executed by a processor, implements the control method as described in any of the preceding claims.

[0031] Compared with the prior art, the technical solution provided in this application has at least the following beneficial effects:

[0032] This application has at least two operating states. In the first operating state, the liquid outlet, heat release channel, refrigerant coil, heat receiving channel, and liquid inlet of the liquid cooling system are sequentially connected. The refrigerant can release heat through the heat release channel to reduce the temperature of the fluid entering the refrigerant coil and improve the heat exchange efficiency of the refrigerant coil. The refrigerant can also absorb heat from the condenser of the compression refrigeration system through the heat receiving channel to ensure the heat exchange effect of the condenser and avoid excessive condensation pressure in the condenser. In the second operating state, the liquid outlet, heat receiving channel, and liquid inlet of the liquid cooling system are sequentially connected, and the two ends of the heat release channel are respectively connected to the two ends of the refrigerant coil. The liquid inlet and outlet of the liquid cooling system are directly connected to the heat release channel, forming a circulation loop. The refrigerant absorbs heat from the condenser of the compression refrigeration system through the heat receiving channel. The refrigerant coil is connected to the heat release channel, also forming a circulation loop. The refrigerant cooled in the heat release channel enters the refrigerant coil, improving the heat exchange efficiency of the refrigerant coil. This demonstrates that as long as the compression refrigeration system is operating, the refrigerant within the liquid cooling system can exchange heat with the condenser of the compression refrigeration system, ensuring the condenser's heat exchange efficiency, preventing excessive condensing pressure, and reducing unit energy consumption. Furthermore, this application utilizes the cooling medium of the liquid cooling system to remove heat from the condenser, eliminating the need for additional heat dissipation devices and saving space in the machine room, making implementation more convenient and faster. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the dual-cooling-source air conditioning principle provided in an embodiment of this application.

[0035] In the diagram: 1-Liquid cooling system; 2-Condenser; 3-Compressor; 4-Evaporator; 5-Refrigeration fluid coil; 6-First main control valve; 7-First bypass valve; 8-Third main control valve; 9-First three-way valve; 10-Second three-way valve; 11-Circulation pump; 12-Second bypass valve; 13-Second main control valve; 14-Expansion valve; 15-Sight glass; 16-Drier filter; 17-Pressure sensor; 18-Temperature sensor. Detailed Implementation

[0036] The technical solutions of 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 of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] It should be noted that in this embodiment, the orientation or positional relationship indicated by terms such as "upper," "lower," "front," and "rear" is based on the orientation or positional relationship shown in the accompanying drawings. It is used only for the convenience of describing this application and for simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application. Furthermore, "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Please refer to Figure 1 In this embodiment, a dual-source air conditioner is provided. The dual-source air conditioner includes a liquid cooling system 1, a compression refrigeration system, a refrigerant coil 5, and a controller. The liquid cooling system 1 can be a closed cooling tower. It can force airflow through an external fan to exchange heat between the air and the spray water, thereby removing the heat from the outside of the coil wall and reducing the temperature of the cooling water (cooling medium).

[0040] The compression refrigeration system includes a heat release channel for releasing heat from the refrigerant after throttling and a heat absorption channel for absorbing heat from the refrigerant after compression by the compressor 3; wherein, the liquid inlet of the heat release channel is optionally connected to the liquid outlet of the liquid cooling system 1 or the liquid outlet of the refrigeration fluid coil 5, and the liquid outlet of the heat release channel is optionally connected to the liquid inlet of the refrigeration fluid coil 5; the liquid inlet of the heat absorption channel is optionally connected to the liquid outlet of the liquid cooling system 1 or the liquid outlet of the refrigeration fluid coil 5, and the liquid outlet of the heat absorption channel is optionally connected to the liquid inlet of the liquid cooling system 1.

[0041] There are two scenarios when the compression refrigeration system (compressor mode) is running. The first scenario is that the compression refrigeration system and the liquid cooling system 1 work together as the cold source for the refrigerant coil 5, i.e., the controller is in the first working state, and the liquid outlet, heat release channel, refrigerant coil 5, heat receiving channel, and liquid inlet of the liquid cooling system 1 are connected in sequence. The second scenario is that the compression refrigeration system alone works as the cold source for the refrigerant coil 5, i.e., the controller is in the second working state, and the liquid outlet, heat receiving channel, and liquid inlet of the liquid cooling system 1 are connected in sequence, with the two ends of the heat release channel connected to the two ends of the refrigerant coil 5 respectively.

[0042] In both of the above situations, the compression refrigeration system is in operation, so its condenser 2 needs to maintain a certain heat exchange effect. In the first situation, the heat-carrying cooling medium can exchange heat with the condenser 2 of the compression refrigeration system through the heat exchange channel, thereby removing the heat of the refrigerant in the condenser 2 and cooling the cooling medium in the liquid cooling system 1 to ensure the cooling effect of the cooling medium in the circulation loop.

[0043] In the second case mentioned above, the refrigerant coil 5 and the heat dissipation channel form a circulation loop. Therefore, in order to make full use of the liquid cooling system 1, the inlet and outlet of the liquid cooling system 1 can also form a circulation loop with the heat receiving channel. The heat receiving channel is used to achieve heat exchange with the condenser 2, thereby removing the heat of the refrigerant in the condenser 2.

[0044] It can be seen that this application has at least two working states. In the first working state, the liquid outlet, heat release channel, refrigerant coil 5, heat receiving channel, and liquid inlet of the liquid cooling system 1 are connected in sequence. The refrigerant can release heat through the heat release channel to reduce the temperature of the fluid entering the refrigerant coil 5 and improve the heat exchange efficiency of the refrigerant coil 5. The refrigerant can also absorb heat from the condenser 2 of the compression refrigeration system through the heat receiving channel to ensure the heat exchange effect of the condenser 2 and avoid excessive condensation pressure of the condenser 2. In the second working state, the liquid outlet, heat receiving channel, and liquid inlet of the liquid cooling system 1 are connected in sequence, and the two ends of the heat release channel are respectively connected to the two ends of the refrigerant coil 5. The liquid inlet and outlet of the liquid cooling system 1 are directly connected to the heat release channel to form a circulation loop. The heat is absorbed from the condenser 2 of the compression refrigeration system through the heat receiving channel. The refrigerant coil 5 is connected to the heat release channel, also forming a circulation loop. The refrigerant cooled in the heat release channel enters the refrigerant coil 5 to improve the heat exchange efficiency of the refrigerant coil 5. This demonstrates that as long as the compression refrigeration system is operating, the refrigerant in the liquid cooling system 1 can exchange heat with the condenser 2 of the compression refrigeration system, ensuring the heat exchange effect of the condenser 2, preventing excessive condensing pressure in the condenser 2, and reducing unit energy consumption. Furthermore, this application utilizes the cooling medium of the liquid cooling system 1 to remove heat from the condenser 2, eliminating the need for additional heat dissipation devices and saving space in the machine room, making implementation more convenient and faster.

[0045] The compression refrigeration system includes a compressor 3, an evaporator 4, and a condenser 2. The heat release channel is located inside the evaporator 4, and the heat receiving channel is located inside the condenser 2. The evaporator 4 includes an evaporating-side refrigerant channel that exchanges heat with the heat release channel, and the condenser 2 includes a condensing-side refrigerant channel that exchanges heat with the heat receiving channel. The refrigerant releases heat at the condenser 2, and the released heat is transferred to the refrigeration fluid through the heat receiving channel. The refrigerant absorbs heat at the evaporator 4, and the heat of the refrigeration fluid is released through the heat release channel and absorbed by the refrigerant.

[0046] Please refer to Figure 1 The outlet of the liquid cooling system 1 is connected to one end of the third main control valve 8 and the first end of the first three-way valve 9. The second end of the first three-way valve 9 is connected to one end of the second bypass valve 12 and one end of the second main control valve 13. The other end of the second bypass valve 12 is connected to the inlet of the heat release channel. The outlet of the heat release channel is connected to the other end of the second main control valve 13 and the inlet of the refrigerant coil 5. The outlet of the refrigerant coil 5 is connected to the second end of the second three-way valve 10. The first end of the second three-way valve 10 is connected to the other end of the third main control valve 8, the inlet of the heat receiving channel, and one end of the first main control valve 6. The other end of the first main control valve 6 is connected to one end of the first bypass valve 7 and the inlet of the liquid cooling system 1. The other end of the first bypass valve 7 is connected to the outlet of the heat receiving channel.

[0047] The condenser 2 and evaporator 4 of this application can be condenser plate heat exchangers and evaporator plate heat exchangers, which replace the traditional fluorine heat exchangers. The condenser 2 and evaporator 4 are connected in series with the chilled fluid coil 5, so the indoor return air does not need to pass through the fluorine heat exchanger, reducing the indoor fan resistance and lowering the unit's energy consumption.

[0048] Based on the above configuration, when the outlet temperature of the liquid cooling system 1 is lower than the preset inlet water temperature of the chilled fluid coil 5, it indicates that the liquid cooling system 1 itself can meet the cooling capacity requirements of the chilled fluid coil 5. At this time, the liquid cooling system 1 can act as the cold source for the chilled fluid coil 5 independently. The first and second ends of the first three-way valve 9 are connected, and the first main control valve 6 and the second main control valve 13 are open. That is, the outlet of the liquid cooling system 1 is directly connected to the inlet of the chilled fluid coil 5, and the outlet of the chilled fluid coil 5 is connected to the inlet of the liquid cooling system 1. At the same time, the third main control valve 8 is closed. Since the compression refrigeration system is not running, neither the condenser 2 nor the evaporator 4 needs heat exchange, so the first bypass valve 7 and the second bypass valve 12 are closed. The low-temperature cooling medium exchanges heat with the high-temperature return air of the computer room in the chilled fluid coil 5. The high-temperature cooling medium after heat exchange returns to the liquid cooling system 1, forming a natural cooling mode.

[0049] When the liquid cooling system 1 is running at full power, the cooling effect of the cooling medium is the highest. If the preset inlet water temperature of the refrigerant coil 5 is less than the outlet liquid temperature of the liquid cooling system 1 and less than the return air temperature of the computer room, it means that the liquid cooling system 1 still cannot meet the cooling capacity required by the refrigerant coil 5 at full power. Therefore, it is necessary to open the compression refrigeration system. The liquid cooling system 1 and the compression refrigeration system work together as the cold source for the refrigerant coil. Based on the natural cooling mode, the first main control valve 6 can be closed or partially closed, while the first bypass valve 7 can be opened, so that the cooling medium can enter or partially enter the heating channel, where it can exchange heat with the refrigerant in the condenser 2. Similarly, the second main control valve 13 can be closed or partially closed, while the second bypass valve 12 can be opened, so that the cooling medium can enter or partially enter the heat release channel, where it can exchange heat with the refrigerant in the evaporator 4 to achieve cooling, thus forming a pre-cooling mode.

[0050] When the liquid cooling system 1 is running at full power, if the preset inlet water temperature of the chilled fluid coil 5 is less than the outlet liquid temperature of the liquid cooling system 1 and less than the return air temperature of the computer room, and the cooling frequency of the compression refrigeration system is greater than the cooling frequency of the liquid cooling system 1, it indicates that the cooling capacity required by the chilled fluid coil 5 has further increased, and the compression refrigeration system needs to be used as the cold source for the chilled fluid coil 5. On the basis of the pre-cooling mode, the second end of the first three-way valve 9 is connected to the third end, that is, the inlet and outlet of the chilled fluid coil 5 are directly connected to the two ends of the heat dissipation channel to form a circulation loop, and the power of fluid circulation is provided by the circulation pump 11. At this time, the liquid cooling system 1 uses the outdoor natural cold source for heat exchange, and the corresponding third main control valve 8 is opened, and the inlet and outlet of the liquid cooling system 1 are connected to the two ends of the heat receiving channel to form another circulation loop, so as to form a mechanical refrigeration mode.

[0051] In addition, the compression refrigeration system also includes a circulation loop connecting the condenser 2 and the evaporator 4, as well as a compressor 3, an expansion valve 14, a dryer filter 16, a sight glass 15, etc., which are located on the circulation loop. No further restrictions will be made here. Please refer to the prior art for details.

[0052] The dual-source air conditioner of this application also includes a temperature sensor 18 and a pressure sensor 17. The temperature sensor 18 and / or the pressure sensor 17 are located at the inlet and outlet of the liquid cooling system 1, the inlet and outlet of the heat dissipation channel, and the inlet and outlet of the heat receiving channel. For example, the first main control valve 6 can be adjusted based on the temperature difference of the temperature sensor 18 at the inlet and outlet of the liquid cooling system 1; or, the external fan of the liquid cooling system 1 can be adjusted based on the outlet temperature detected by the temperature sensor 18 at the outlet of the liquid cooling system 1. The pressure sensor 17 can monitor the pressure in the channel in real time, and adjust the corresponding valves and other devices according to the pressure.

[0053] In some embodiments, the first bypass valve 7 can be adjusted according to the temperature of the condenser 2; the compressor 3 can be adjusted according to the outlet water temperature of the evaporator 4; and the second bypass valve 12 can be adjusted according to the temperature difference between the inlet and outlet water of the evaporator 4. When the temperature at the inlet of the chilled fluid coil 5 rises, the inlet and outlet water temperatures of the evaporator 4 also rise. At this time, the compressor 3 adjusts according to the outlet water temperature of the evaporator 4, increasing its frequency until the outlet water temperature of the evaporator 4 reaches the set value. When the inlet water temperature drops, the inlet and outlet water temperatures of the evaporator 4 also drop. At this time, the compressor 3 adjusts according to the outlet water temperature of the evaporator 4, decreasing its frequency until the outlet water temperature of the evaporator 4 reaches the set value. All of the above can be achieved through temperature detection by the temperature sensor 18, thereby realizing real-time adjustment, which will not be elaborated further here.

[0054] It should be noted that all of the above valve devices can be electrically controlled valves to achieve automatic control.

[0055] This application also provides a control method applicable to the aforementioned dual-source air conditioner, comprising:

[0056] Determine the current work status;

[0057] In the first working state, the compression refrigeration system is turned on, and the liquid outlet, heat release channel, refrigerant coil 5, heat receiving channel and liquid inlet of the liquid cooling system 1 are connected in sequence.

[0058] In the second working state, the compression refrigeration system is turned on, and the liquid outlet, heating channel and liquid inlet of the liquid cooling system 1 are connected in sequence, and the two ends of the heat release channel are connected to the two ends of the refrigerant coil 5 respectively.

[0059] In the third working state, the compression refrigeration system is shut down, and the liquid outlet of the liquid cooling system 1, the refrigerant coil 5, and the liquid inlet of the liquid cooling system 1 are connected in sequence.

[0060] When determining the current working status, the following should be included:

[0061] Obtain the preset inlet temperature of the refrigeration fluid coil 5 and the outlet temperature of the liquid cooling system 1;

[0062] If the preset inlet water temperature of the chilled fluid coil 5 is greater than or equal to the outlet liquid temperature of the liquid cooling system 1, then the current state is determined to be the third working state. The unit operates in natural cooling mode, the compression refrigeration system is shut down, and the liquid outlet of the liquid cooling system 1, the chilled fluid coil 5 and the liquid inlet of the liquid cooling system 1 are connected in sequence to the liquid cooling system 1 to exchange heat with the outdoor natural cold source. The low-temperature cooling medium goes to the chilled fluid coil 5 to exchange heat with the high-temperature return air of the machine room. The high-temperature cooling medium after heat exchange returns to the liquid cooling system 1.

[0063] Specifically, in the third working state, the third main control valve 8 is closed, the first end and the second end of the first three-way valve 9 are open, the second main control valve 13 is open, the second bypass valve 12 is closed, the first end and the second end of the second three-way valve 10 are open, the first main control valve 6 is open, and the first bypass valve 7 is closed.

[0064] If the preset inlet water temperature of the chilled fluid coil 5 is lower than the outlet liquid temperature of the liquid cooling system 1, the return air temperature of the computer room is obtained under the full power operation of the liquid cooling system 1. If the outlet liquid temperature of the liquid cooling system 1 is less than or equal to the return air temperature of the computer room, the compression refrigeration system is controlled to start, and it is determined whether the refrigeration frequency of the compression refrigeration system is less than the refrigeration frequency of the liquid cooling system 1. If so, the current state is determined to be the first working state; otherwise, the current state is determined to be the second working state.

[0065] In the first working state, the unit operates in pre-cooling mode. Based on the natural cooling mode, the liquid outlet, heat release channel, refrigerant coil 5, heat receiving channel and liquid inlet of liquid cooling system 1 are connected in sequence. At this time, the low-temperature cooling medium flowing out of liquid cooling system 1 can exchange heat with evaporator 4 to cool down, and enter refrigerant coil 5 to exchange heat with the high-temperature return air of the machine room. The high-temperature cooling medium after heat exchange exchanges heat with the high-temperature refrigerant of condenser 2, takes away part of the heat of condenser 2, and flows back to liquid cooling system 1 to cool down.

[0066] Specifically, in the first working state, the third main control valve 8 is closed, the first end and the second end of the first three-way valve 9 are open, the second main control valve 13 is closed, the second bypass valve 12 is open, the first end and the second end of the second three-way valve 10 are open, the first main control valve 6 is closed, and the first bypass valve 7 is open.

[0067] In the second operating state, the unit operates in mechanical refrigeration mode. Based on the pre-cooling mode, the liquid outlet, heating channel, and liquid inlet of the liquid cooling system 1 are connected sequentially, and the two ends of the heat release channel are connected to the two ends of the refrigerant coil 5 respectively. At this time, the liquid inlet and outlet of the refrigerant coil 5 are connected to the heat release channel to form a circulation loop. At the same time, the circulation pump 11 is started to provide power for the circulation loop. In addition, the liquid cooling system 1 uses the outdoor natural cold source for heat exchange. The liquid cooling system 1 and the heating channel form a circulation loop. The cooling medium of the liquid cooling system 1 can exchange heat with the condenser 2 and remove the heat from the condenser 2, reducing the condensing pressure of the condenser 2.

[0068] Specifically, in the second working state, the third main control valve 8 is turned on, the second and third ends of the first three-way valve 9 are turned on, the second main control valve 13 is turned off, the second bypass valve 12 is turned on, the second and third ends of the second three-way valve 10 are turned on, the first main control valve 6 is turned off, and the first bypass valve 7 is turned on.

[0069] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0070] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A dual-cooling-source air conditioner, characterized in that, include: Refrigeration fluid coil (5); Liquid cooling system (1) is used to supply refrigerant; The compression refrigeration system includes a heat release channel for releasing heat from the refrigerant after throttling and a heat absorption channel for absorbing heat from the refrigerant after compression by the compressor (3); wherein, the liquid inlet of the heat release channel is connected to the liquid outlet of the liquid cooling system (1) or the liquid outlet of the refrigeration fluid coil (5), and the liquid outlet of the heat release channel is connected to the liquid inlet of the refrigeration fluid coil (5); the liquid inlet of the heat absorption channel is connected to the liquid outlet of the liquid cooling system (1) or the liquid outlet of the refrigeration fluid coil (5), and the liquid outlet of the heat absorption channel is connected to the liquid inlet of the liquid cooling system (1); The controller is used to control the liquid outlet of the liquid cooling system (1), the heat release channel, the refrigeration fluid coil (5), the heat receiving channel, and the liquid inlet of the liquid cooling system (1) to be connected sequentially in the first working state, wherein the compression refrigeration system and the liquid cooling system (1) together serve as the cold source of the refrigeration fluid coil (5); and in the second working state, to control the liquid outlet of the liquid cooling system (1), the heat receiving channel, and the liquid inlet of the liquid cooling system (1) to be connected sequentially, wherein both ends of the heat release channel are respectively connected to the refrigeration fluid. At both ends of the coil (5), the compression refrigeration system serves as the cold source for the refrigeration fluid coil (5) alone; in the third working state, the compression refrigeration system is shut down, and the liquid outlet of the liquid cooling system (1), the refrigeration fluid coil (5) and the liquid inlet of the liquid cooling system (1) are connected in sequence. The liquid cooling system (1) uses the outdoor natural cold source for heat exchange. The low-temperature cooling medium goes to the refrigeration fluid coil (5) to exchange heat with the high-temperature return air of the machine room. The high-temperature cooling medium after heat exchange returns to the liquid cooling system (1). The compression refrigeration system includes an evaporator (4), a condenser (2), a compressor (3), and an expansion valve (14). The evaporator (4) includes an evaporating-side refrigerant channel that exchanges heat with the heat release channel, and the condenser (2) includes a condensing-side refrigerant channel that exchanges heat with the heat receiving channel. The compressor (3), the condensing-side refrigerant channel, the expansion valve (14), and the evaporating-side refrigerant channel are sequentially and cyclically connected.

2. The dual-cooling-source air conditioner according to claim 1, characterized in that, The outlet of the liquid cooling system (1) is connected to one end of the third main control valve (8) and the first end of the first three-way valve (9). The second end of the first three-way valve (9) is connected to one end of the second bypass valve (12). The other end of the second bypass valve (12) is connected to the inlet of the heat release channel. The outlet of the heat release channel is connected to the inlet of the refrigeration fluid coil (5). The outlet of the refrigeration fluid coil (5) is connected to the second end of the second three-way valve (10). The first end of the second three-way valve (10) is connected to the other end of the third main control valve (8) and the inlet of the heat receiving channel. The outlet of the heat receiving channel is connected to one end of the first bypass valve (7). The other end of the first bypass valve (7) is connected to the inlet of the liquid cooling system (1). In the first working state, the third main control valve (8) is closed, the first end and the second end of the first three-way valve (9) are open, the second bypass valve (12) is open, the first end and the second end of the second three-way valve (10) are open, and the first bypass valve (7) is open. In the second working state, the third main control valve (8) is turned on, the second and third ends of the first three-way valve (9) are turned on, the second bypass valve (12) is turned on, the second and third ends of the second three-way valve (10) are turned on, and the first bypass valve (7) is turned on.

3. The dual-cooling-source air conditioner according to claim 2, characterized in that, A circulation pump (11) is provided between the third end of the first three-way valve (9) and the third end of the second three-way valve (10).

4. The dual-cooling-source air conditioner according to claim 2, characterized in that, The second end of the first three-way valve (9) is also connected to one end of the second main control valve (13), and the other end of the second main control valve (13) is connected to the outlet of the heat release channel and the inlet of the refrigeration fluid coil (5), respectively. The second end of the second three-way valve (10) is also connected to one end of the first main control valve (6), and the other end of the first main control valve (6) is connected to the other end of the first bypass valve (7) and the liquid inlet of the liquid cooling system (1); in the first working state, the second main control valve (13) is closed and the first main control valve (6) is closed; in the second working state, the second main control valve (13) is closed and the first main control valve (6) is closed.

5. The dual-cooling-source air conditioner according to claim 4, characterized in that, It also includes a temperature sensor (18) and a pressure sensor (17), wherein the temperature sensor (18) and / or the pressure sensor (17) are located at the liquid inlet and outlet of the liquid cooling system (1), the liquid inlet and outlet of the heat dissipation channel and the liquid inlet and outlet of the heat receiving channel.

6. A control method, characterized in that, The dual-source air conditioner according to any one of claims 1-5 comprises: Determine the current work status; In the first working state, the compression refrigeration system is turned on, and the liquid outlet, heat release channel, refrigeration fluid coil (5), heat receiving channel and liquid inlet of the liquid cooling system (1) are connected in sequence. In the second working state, the compression refrigeration system is turned on, and the liquid outlet of the liquid cooling system (1), the heating channel and the liquid inlet of the liquid cooling system (1) are connected in sequence, and the two ends of the heat release channel are respectively connected to the two ends of the refrigeration fluid coil (5).

7. The control method according to claim 6, characterized in that, Also includes: In the third working state, the compression refrigeration system is shut down, and the liquid outlet of the liquid cooling system (1), the refrigeration fluid coil (5), and the liquid inlet of the liquid cooling system (1) are connected in sequence.

8. The control method according to claim 7, characterized in that, Determining the current working status includes: Obtain the preset inlet temperature of the refrigerant coil (5) and the current outlet temperature of the liquid cooling system (1); If the preset inlet temperature is less than the outlet temperature of the liquid cooling system (1), the return air temperature of the computer room is obtained under full power operation of the liquid cooling system (1). If the outlet temperature of the liquid cooling system (1) is less than or equal to the return air temperature of the computer room, the compression refrigeration system is controlled to start, and it is determined whether the refrigeration frequency of the compression refrigeration system is less than the refrigeration frequency of the liquid cooling system (1). If so, the current state is determined to be the first working state; otherwise, the current state is determined to be the second working state. If the preset inlet temperature is greater than or equal to the outlet temperature of the liquid cooling system (1), then the current state is determined to be the third working state.

9. A computer-readable storage medium, characterized in that, Used to store a computer program, which, when executed by a processor, implements the control method as described in any one of claims 6 to 8.

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