Double-cold-source air conditioner and control method

Abstract

The invention discloses a double-cold-source air conditioner and a control method, and relates to the technical field of machine room air conditioners. The liquid cooling system is used for supplying freezing fluid; the compression refrigeration system comprises a heat release channel for releasing heat for the throttled refrigerant and a heated channel for absorbing heat for the refrigerant compressed by a compressor; wherein a liquid inlet of the heat release channel selectively communicates with a liquid outlet of the liquid cooling system or a liquid outlet of the freezing fluid coil pipe, and a liquid outlet of the heat release channel selectively communicates with a liquid inlet of the freezing fluid coil pipe; a liquid inlet of the heated channel selectively communicates with a liquid outlet of the liquid cooling system or a liquid outlet of the freezing fluid coil pipe, and a liquid outlet of the heated channel selectively communicates with a liquid inlet of the liquid cooling system. Heat of the condensation end of the compression refrigeration system can be taken away through the cold carrying medium in the liquid cooling system, and therefore the heat exchange effect of the condensation end is improved.

Description

Technical Field

[0001] The present application relates to the technical field of computer room air conditioners, and in particular to a dual-cold-source air conditioner and a control method thereof. Background Art

[0002] The dual-cold-source air-conditioning system usually adopts a liquid cooling system and a compressor refrigeration system in parallel. Both systems can independently provide sufficient cooling capacity for the data center to ensure the refrigeration reliability of the dual-cold-source air-conditioning system.

[0003] In the process of implementing the present invention, the inventors found that the prior art has at least the following problems:

[0004] When the compressor refrigeration system (compressor mode) provides cooling capacity, the condensing 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 condensing end is poor, the heat exchange effect between the condensing end and the external environment will be poor, thereby increasing the condensing pressure, increasing the compressor energy consumption, and wasting electricity resources.

[0005] Therefore, in view of the above technical problems, how to improve the heat exchange effect at the condensing end of the compressor refrigeration system is a technical problem that technical personnel in this field need to solve. Summary of the invention

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

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

[0008] Refrigerated fluid coils;

[0009] A liquid cooling system for supplying a refrigerating fluid;

[0010] A compression refrigeration system, comprising a heat-releasing channel for releasing heat to a throttled refrigerant and a heat-receiving channel for absorbing heat from the refrigerant after being compressed by a compressor; wherein the liquid inlet of the heat-releasing channel is optionally connected to the liquid outlet of the liquid cooling system or the liquid outlet of the refrigerating fluid coil, and the liquid outlet of the heat-releasing channel is optionally connected to the liquid inlet of the refrigerating fluid coil; the liquid inlet of the heat-receiving channel is optionally connected to the liquid outlet of the liquid cooling system or the liquid outlet of the refrigerating fluid coil, and the liquid outlet of the heat-receiving 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 refrigeration fluid coil, the heat receiving channel and the liquid inlet of the liquid cooling system to be connected in sequence in a first working state; and 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 in sequence in a second working state, and the two ends of the heat release channel are respectively connected to the two ends of the refrigeration fluid coil.

[0012] Preferably, the compression refrigeration system includes an evaporator, a condenser, a compressor and an expansion valve, the evaporator includes an evaporation-side refrigerant channel for exchanging heat with the heat release channel, and the condenser includes a condensation-side refrigerant channel for exchanging heat with the heat receiving channel; the compressor, the condensation-side refrigerant channel, the expansion valve and the evaporation-side refrigerant channel are circulated and connected in sequence.

[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 refrigerating fluid coil, the liquid outlet of the refrigerating fluid 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 end and the second end of the first three-way valve are connected, the second bypass valve is connected, the first end and the second end of the second three-way valve are connected, and the first bypass valve is connected;

[0015] In the second working state, the third main control valve is turned on, the second end and the third end of the first three-way valve are turned on, the second bypass valve is turned on, the second end and the third end 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 a 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 refrigeration fluid 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, it also includes a temperature sensor and a pressure sensor, and the temperature sensor and / or the pressure sensor are arranged at the liquid inlet and outlet ends of the liquid cooling system, the liquid inlet and outlet ends of the heat release channel, and the liquid inlet and outlet ends of the heat receiving channel.

[0020] A control method, applied to the above-mentioned dual cold source air conditioner, comprising:

[0021] Determine the current working status;

[0022] In the first working state, the compression refrigeration system is controlled to be turned on, and the liquid outlet of the liquid cooling system, the heat release channel, the refrigeration fluid coil, the heat receiving channel and the liquid inlet of the liquid cooling system are controlled to be connected in sequence;

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

[0024] Preferably, it also includes:

[0025] In the third working state, the compression refrigeration system is controlled to be closed, and the liquid outlet of the liquid cooling system, the refrigeration fluid coil and the liquid inlet of the liquid cooling system are controlled to be connected in sequence.

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

[0027] Obtaining the preset inlet temperature of the refrigeration fluid coil and the outlet temperature of the current liquid cooling system;

[0028] If the preset liquid inlet temperature is lower than the liquid outlet temperature of the liquid cooling system, the return air temperature of the computer room is obtained when the liquid cooling system is running at full power; if the liquid outlet temperature of the liquid cooling system is lower than or equal to the return air temperature of the computer room, the compression refrigeration system is controlled to be turned on, and it is determined whether the refrigeration frequency of the compression refrigeration system is lower than the refrigeration frequency of the liquid cooling system; if so, it is determined that the current state is the first working state; otherwise, it is determined that the current state is the second working state;

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

[0030] A computer-readable storage medium is used to store a computer program, wherein the computer program implements any of the control methods described above when executed by a processor.

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

[0032] The present application has at least two working states. In the first working state, the liquid outlet, heat release channel, refrigerated fluid coil, heated channel and liquid inlet of the liquid cooling system are connected in sequence. The refrigerated fluid can release heat through the heat release channel to reduce the fluid temperature entering the refrigerated fluid coil and improve the heat exchange efficiency of the refrigerated fluid coil. The refrigerated fluid can also absorb the heat of the condenser of the compression refrigeration system through the heated channel to ensure the heat exchange effect of the condenser and avoid the condensation pressure of the condenser being too high. In the second working state, the liquid outlet, heated channel and 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 refrigerated fluid coil. The liquid inlet and outlet of the liquid cooling system are directly connected to the heat release channel to form a circulation loop, and the heat of the condenser of the compression refrigeration system is absorbed through the heated channel. The refrigerated fluid coil is connected to the heat release channel to also form a circulation loop. The refrigerated fluid after cooling in the heat release channel enters the refrigerated fluid coil to improve the heat exchange efficiency of the refrigerated fluid coil. It can be seen from this that as long as the compression refrigeration system is running, the refrigerant fluid in the liquid cooling system can exchange heat with the condenser of the compression refrigeration system, which can ensure the heat exchange effect of the condenser, avoid the condensation pressure of the condenser being too high, and reduce the energy consumption of the unit. At the same time, the present application uses the cooling medium of the liquid cooling system to take away the heat of the condenser, and does not require the additional arrangement of other heat dissipation devices, does not occupy additional machine room space, and is more convenient and quick to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0034] Figure 1 This is a schematic diagram of the principle of a dual cold source air conditioner provided in an embodiment of the present application.

[0035] In the figure: 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-drying filter; 17-pressure sensor; 18-temperature sensor. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] It should be noted that in this embodiment, the directions or positional relationships indicated by "upper", "lower", "front", "back", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application. In addition, "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0038] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

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

[0040] The compression refrigeration system includes a heat release channel for releasing heat to the refrigerant after throttling and a heat receiving 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 receiving 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 receiving channel is optionally connected to the liquid inlet of the liquid cooling system 1.

[0041] There are two situations when the compression refrigeration system (compressor mode) is running. The first situation is that the compression refrigeration system and the liquid cooling system 1 jointly serve as the cold source of the refrigerating fluid coil 5, that is, the controller is in the first working state, and the liquid outlet of the liquid cooling system 1, the heat release channel, the refrigerating fluid coil 5, the heat receiving channel and the liquid inlet of the liquid cooling system 1 are connected in sequence; the second situation is that the compression refrigeration system alone serves as the cold source of the refrigerating fluid coil 5, that is, the controller is in the second working state, the liquid outlet of the liquid cooling system 1, the heat receiving 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 refrigerating fluid coil 5.

[0042] For the above two situations, the compression refrigeration system is in operation, so its condenser 2 needs to maintain a certain heat exchange effect; for the first situation mentioned above, the heat-carrying cooling medium can exchange heat with the condenser 2 of the compression refrigeration system through the heat receiving channel, thereby taking away 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] For the second case mentioned above, the refrigeration fluid coil 5 and the heat release channel form a circulation loop. Therefore, in order to make full use of the liquid cooling system 1, the liquid inlet and outlet of the liquid cooling system 1 can also form a circulation loop with the heat receiving channel, and the heat receiving channel can be used to achieve heat exchange with the condenser 2, thereby taking away the heat of the refrigerant in the condenser 2.

[0044] It can be seen that the present application has at least two working states. In the first working state, the liquid outlet, heat release channel, refrigerated fluid coil 5, heated channel and liquid inlet of the liquid cooling system 1 are connected in sequence, and the refrigerated fluid can release heat through the heat release channel to reduce the fluid temperature entering the refrigerated fluid coil 5 and improve the heat exchange efficiency of the refrigerated fluid coil 5; the refrigerated fluid can also absorb the heat of the compression refrigeration system condenser 2 through the heated channel to ensure the heat exchange effect of the condenser 2 and avoid the condensation pressure of the condenser 2 being too high. In the second working state, the liquid outlet, heated 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 refrigerated fluid coil 5, and the liquid inlet and outlet of the liquid cooling system 1 are directly connected to the heat release channel to form a circulation loop, and the heat of the compression refrigeration system condenser 2 is absorbed through the heated channel; the refrigerated fluid coil 5 is connected to the heat release channel, and a circulation loop is also formed. The refrigerated fluid after cooling in the heat release channel enters the refrigerated fluid coil 5, and the heat exchange efficiency of the refrigerated fluid coil 5 is improved. It can be seen from this that as long as the compression refrigeration system is running, the refrigerant fluid in the liquid cooling system 1 can exchange heat with the condenser 2 of the compression refrigeration system, which can ensure the heat exchange effect of the condenser 2, avoid the condensation pressure of the condenser 2 being too high, and reduce the energy consumption of the unit. At the same time, the present application uses the cooling medium of the liquid cooling system 1 to take away the heat of the condenser 2, does not need to arrange other heat dissipation devices, does not occupy additional machine room space, and is more convenient and quick to implement.

[0045] The compression refrigeration system includes a compressor 3, an evaporator 4 and a condenser 2. The heat release channel is arranged in the evaporator 4, and the heat receiving channel is arranged in the condenser 2. At the same time, the evaporator 4 includes an evaporation-side refrigerant channel for exchanging heat with the heat release channel, and the condenser 2 includes a condensation-side refrigerant channel for exchanging 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 releases heat through the heat release channel and is absorbed by the refrigerant.

[0046] Please refer to Figure 1 The liquid 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 liquid inlet of the heat release channel, the liquid outlet of the heat release channel is connected to the other end of the second main control valve 13 and the liquid inlet of the refrigeration fluid coil 5, the liquid 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, the liquid 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 liquid inlet of the liquid cooling system 1, and the other end of the first bypass valve 7 is connected to the liquid outlet of the heat receiving channel.

[0047] The condenser 2 and evaporator 4 of the present application can be a condensation plate exchanger and an evaporation plate exchanger, which replace the traditional fluorine heat exchanger. The condenser 2 and the evaporator 4 are connected in series with the refrigeration fluid coil 5. The indoor return air does not need to pass through the fluorine heat exchanger, thereby reducing the indoor fan resistance and the energy consumption of the unit.

[0048] Based on the above setting, when the liquid outlet temperature of the liquid cooling system 1 is lower than the preset water inlet temperature of the refrigerating fluid coil 5, it means that the liquid cooling system 1 itself can meet the cooling demand of the refrigerating fluid coil 5. At this time, the liquid cooling system 1 can be used as a cold source for the refrigerating fluid coil 5 alone. The first end and the second end of the first three-way valve 9 are connected, and the first main control valve 6 and the second main control valve 13 are opened, that is, the liquid outlet of the liquid cooling system 1 is directly connected to the liquid inlet of the refrigerating fluid coil 5, and the liquid outlet of the refrigerating fluid coil 5 is connected to the liquid inlet of the liquid cooling system 1. At the same time, the third main control valve 8 is closed, and since the compression refrigeration system is not running, the condenser 2 and the evaporator 4 do not need 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 machine room in the refrigerating fluid coil 5, and 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 water inlet temperature of the refrigerating fluid coil 5 is less than the liquid outlet temperature of the liquid cooling system 1 and less than the return air temperature of the machine room, it means that the liquid cooling system 1 is still unable to meet the cooling capacity required by the refrigerating fluid coil 5 at full power. Therefore, it is necessary to additionally start the compression refrigeration system. The liquid cooling system 1 and the compression refrigeration system jointly serve as the cold source of the freezer coil. On the basis of the natural cooling mode, the first main control valve 6 can be closed or partially closed, and the first bypass valve 7 can be opened at the same time, so that the cooling medium can enter or partially enter the heat receiving channel, and realize heat exchange with the refrigerant in the condenser 2 in the heat receiving channel. Similarly, the second main control valve 13 can be closed or partially closed, and the second bypass valve 12 can be opened at the same time, so that the cooling medium can enter or partially enter the heat release channel, and realize heat exchange and cooling with the refrigerant in the evaporator 4 in the heat release channel to form a pre-cooling mode.

[0050] When the liquid cooling system 1 is running at full power, if the preset inlet water temperature of the refrigerating 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 machine room, and the refrigeration frequency of the compression refrigeration system is greater than the refrigeration frequency of the liquid cooling system 1, it means that the cooling capacity required by the refrigerating fluid coil 5 is further increased, and the compression refrigeration system is required to be used as the cold source of the refrigerating fluid coil 5 alone. 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 refrigerating fluid coil 5 are directly connected to the two ends of the heat release channel to form a circulation loop, and the circulation pump 11 provides power for fluid circulation; at this time, the liquid cooling system 1 uses the outdoor natural cold source for heat exchange, 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 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, and a compressor 3, an expansion valve 14, a drying filter 16, a sight glass 15, etc. arranged on the circulation loop. No further restrictions will be made here, and please refer to the existing technology for details.

[0052] The dual cold source air conditioner of the present application further includes a temperature sensor 18 and a pressure sensor 17. The temperature sensor 18 or / and the pressure sensor 17 are arranged at the liquid inlet and outlet ends of the liquid cooling system 1, the liquid inlet and outlet ends of the heat release channel, and the liquid inlet and outlet ends of the heat receiving channel. For example, the first main control valve 6 can be adjusted according to the temperature difference of the temperature sensor 18 at the liquid inlet and outlet ends of the liquid cooling system 1; for another example, the liquid outlet temperature of the liquid cooling system 1 can be detected according to the temperature sensor 18 at the liquid outlet end of the liquid cooling system 1 to adjust the external fan of the liquid cooling system 1. The pressure sensor 17 can monitor the pressure in the channel in real time to 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 is adjusted according to the outlet water temperature of the evaporator 4; the second bypass valve 12 is adjusted according to the inlet and outlet water temperature difference of the evaporator 4; when the inlet temperature of the refrigerating fluid coil 5 rises, the inlet and outlet water temperatures of the evaporator 4 will also rise, at this time the compressor 3 is adjusted according to the outlet water temperature of the evaporator 4, the compressor 3 is increased in frequency, and 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 will also drop, at this time the compressor 3 is adjusted according to the outlet water temperature of the evaporator 4, the compressor 3 is reduced in frequency, and the outlet water temperature of the evaporator 4 reaches the set value. The above can all be realized by temperature detection through the temperature sensor 18, so as to realize real-time adjustment, which will not be repeated here.

[0054] It should be pointed out that the above-mentioned valve devices can all be electrically controlled valves to achieve automatic control.

[0055] The present application also provides a control method, which can be applied to the above-mentioned dual cold source air conditioner, including:

[0056] Determine the current working status;

[0057] In the first working state, the compression refrigeration system is controlled to be turned on, and 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 are controlled to be connected in sequence;

[0058] In the second working state, the compression refrigeration system is controlled to be turned on, and the liquid outlet of the liquid cooling system 1, the heat receiving channel and the liquid inlet of the liquid cooling system 1 are controlled to be 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;

[0059] In the third working state, the compression refrigeration system is controlled to be closed, 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 controlled to be connected in sequence.

[0060] When determining the current working status, include:

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

[0062] If the preset inlet water temperature of the refrigerating fluid coil 5 is greater than or equal to the outlet liquid temperature of the liquid cooling system 1, it is determined that the current state is the third working state, the unit operates in the natural cooling mode, the compression refrigeration system is turned off, and the outlet of the liquid cooling system 1, the refrigerating fluid coil 5 and the liquid inlet of the liquid cooling system 1 are controlled to be connected in sequence, and the liquid cooling system 1 uses the outdoor natural cold source for heat exchange, and the low-temperature cooling medium goes to the refrigerating fluid coil 5 to exchange heat with the high-temperature return air of the machine room, and 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 connected, the second main control valve 13 is connected, the second bypass valve 12 is closed, the first end and the second end of the second three-way valve 10 are connected, the first main control valve 6 is connected, and the first bypass valve 7 is closed.

[0064] If the preset inlet water temperature of the refrigeration 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 when the liquid cooling system 1 is running at full power. If the outlet liquid temperature of the liquid cooling system 1 is lower 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 lower than the refrigeration frequency of the liquid cooling system 1. If so, it is determined that the current working state is the first working state, otherwise it is determined that the current working state is the second working state.

[0065] In the first working state, the unit runs in pre-cooling mode. On the basis of natural cooling mode, the liquid outlet, heat release channel, refrigeration fluid coil 5, heat receiving channel and liquid inlet of the liquid cooling system 1 are controlled to be connected in sequence. At this time, the low-temperature cooling medium flowing out of the liquid cooling system 1 can exchange heat with the evaporator 4 for cooling, and enter the refrigeration fluid coil 5 for heat exchange 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 the condenser 2, takes away part of the heat of the condenser 2, and flows back to the liquid cooling system 1 for cooling.

[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 connected, the second main control valve 13 is closed, the second bypass valve 12 is connected, the first end and the second end of the second three-way valve 10 are connected, the first main control valve 6 is closed, and the first bypass valve 7 is connected.

[0067] In the second working state, the unit operates in a mechanical refrigeration mode. On the basis of the pre-cooling mode, the liquid outlet of the liquid cooling system 1, the heat receiving channel and the liquid inlet of the liquid cooling system 1 are controlled to be connected in sequence, and the two ends of the heat release channel are controlled to be connected to the two ends of the refrigeration fluid coil 5 respectively. At this time, the liquid inlet and outlet of the refrigeration fluid coil 5 are connected with the heat release channel to form a circulation loop, and the circulation pump 11 is started at the same time to provide power for the circulation loop; in addition, the liquid cooling system 1 uses the outdoor natural cold source for heat exchange, and the liquid cooling system 1 forms a circulation loop with the heat receiving channel. The cooling medium of the liquid cooling system 1 can exchange heat with the condenser 2 and take away the heat of the condenser 2, thereby reducing the condensation pressure of the condenser 2.

[0068] Specifically, in the second working state, the third main control valve 8 is controlled to be connected, the second end and the third end of the first three-way valve 9 are connected, the second main control valve 13 is closed, the second bypass valve 12 is connected, the second end and the third end of the second three-way valve 10 are connected, the first main control valve 6 is closed, and the first bypass valve 7 is connected.

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

[0070] Specific examples are used herein to illustrate the principles and implementation methods of the present application, and the description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A dual cold source air conditioner, characterized in that: include: Refrigeration fluid coil (5); A liquid cooling system (1) for supplying a refrigerating fluid; A compression refrigeration system, comprising a heat release channel for releasing heat from a throttled refrigerant and a heat receiving channel for absorbing heat from the refrigerant after being compressed by a 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 refrigerating fluid coil (5), and the liquid outlet of the heat release channel is optionally connected to the liquid inlet of the refrigerating fluid coil (5); the liquid inlet of the heat receiving channel is optionally connected to the liquid outlet of the liquid cooling system (1) or the liquid outlet of the refrigerating fluid coil (5), and the liquid outlet of the heat receiving channel is optionally connected to the liquid inlet of the liquid cooling system (1); The controller is used for controlling, in a first working state, the liquid outlet of the liquid cooling system (1), the heat release channel, the refrigerating fluid coil (5), the heat receiving channel and the liquid inlet of the liquid cooling system (1) to be connected in sequence; and in a second working state, controlling 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 in sequence, and the two ends of the heat release channel are respectively connected to the two ends of the refrigerating fluid coil (5).

2. The dual cold source air conditioner according to claim 1, characterized in that: The compression refrigeration system comprises an evaporator (4), a condenser (2), a compressor (3) and an expansion valve (14); the evaporator (4) comprises an evaporation-side refrigerant channel for exchanging heat with the heat-releasing channel; the condenser (2) comprises a condensation-side refrigerant channel for exchanging heat with the heat-receiving channel; the compressor (3), the condensation-side refrigerant channel, the expansion valve (14) and the evaporation-side refrigerant channel are cyclically connected in sequence.

3. The dual cold source air conditioner according to claim 2, characterized in that: The liquid 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 liquid inlet of the heat release channel; the liquid outlet of the heat release channel is connected to the liquid inlet of the refrigerating fluid coil (5); the liquid outlet of the refrigerating 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 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 (7); the other end of the first bypass valve (7) is connected to the liquid 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 connected, the second bypass valve (12) is connected, the first end and the second end of the second three-way valve (10) are connected, and the first bypass valve (7) is connected; In the second working state, the third main control valve (8) is turned on, the second end and the third end of the first three-way valve (9) are turned on, the second bypass valve (12) is turned on, the second end and the third end of the second three-way valve (10) are turned on, and the first bypass valve (7) is turned on.

4. The dual cold source air conditioner according to claim 3, 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).

5. The dual cold source air conditioner according to claim 3, characterized in that: The second end of the first three-way valve (9) is also connected to one end of a second main control valve (13), and the other end of the second main control valve (13) is connected to the liquid outlet of the heat release channel and the liquid inlet of the refrigeration fluid coil (5); 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.

6. The dual cold source air conditioner according to claim 5, 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 arranged at the liquid inlet and outlet ends of the liquid cooling system (1), the liquid inlet and outlet ends of the heat release channel, and the liquid inlet and outlet ends of the heat receiving channel.

7. A control method, characterized in that: The dual cold source air conditioner as claimed in any one of claims 1 to 6 comprises: Determine the current working status; In the first working state, the compression refrigeration system is controlled to be turned on, and 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) are controlled to be connected in sequence; In the second working state, the compression refrigeration system is controlled to be turned on, and the liquid outlet of the liquid cooling system (1), the heat receiving channel and the liquid inlet of the liquid cooling system (1) are controlled to be 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).

8. The control method according to claim 7, characterized in that: Also includes: In the third working state, the compression refrigeration system is controlled to be closed, 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 controlled to be connected in sequence.

9. The control method according to claim 8, characterized in that: Determining the current working status includes: Obtaining a preset liquid inlet temperature of the refrigeration fluid coil (5) and a current liquid outlet temperature of the liquid cooling system (1); If the preset liquid inlet temperature is lower than the liquid outlet temperature of the liquid cooling system (1), the return air temperature of the computer room is obtained when the liquid cooling system (1) is running at full power; if the liquid outlet temperature of the liquid cooling system (1) is lower 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 lower than the refrigeration frequency of the liquid cooling system (1); if so, it is determined that the current state is the first working state; otherwise, it is determined that the current state is the second working state; If the preset liquid inlet temperature is greater than or equal to the liquid outlet temperature of the liquid cooling system (1), it is determined that the current state is the third working state.

10. A computer-readable storage medium, characterized in that: Used to store a computer program, which, when executed by a processor, implements the control method according to any one of claims 7 to 9.

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