Double-cold-source air conditioning unit

Abstract

The double-cold-source air conditioning unit comprises an inner unit and an outer unit, and the inner unit comprises a first heat exchanger and a second heat exchanger which are arranged in parallel; the outdoor unit comprises a spraying system and a pressure pump system, the spraying system comprises a sprayer and a water collecting tank, and the pressure pump system comprises a compressor, a third heat exchanger, a liquid storage tank, a first conveying pump and a fourth heat exchanger; one end of the first heat exchanger is connected with one end of the third heat exchanger through a first delivery pump and a liquid storage tank; the other end of the first heat exchanger is connected with the other end of the third heat exchanger through a compressor; a first channel and a second channel are arranged in the fourth heat exchanger; two ends of the first channel are respectively connected with the sprayer and the water collecting tank; two ends of the second channel are respectively connected with two ends of the second heat exchanger; according to the air conditioning unit, refrigeration modes can be flexibly converted, and the air conditioning unit works in different modes according to different environment temperatures, so that the air conditioning unit has a good energy-saving effect and higher operation reliability at different environment temperatures.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to a dual-cold-source air conditioning unit. Background Art

[0002] Improving energy efficiency and reducing energy consumption are key development goals for modern data center cooling systems. Natural cooling technology has gained attention for its effective use of low-temperature outdoor air for auxiliary or direct cooling, thereby reducing the use of mechanical refrigeration systems and achieving energy savings. Currently, common natural cooling technologies include evaporative cooling and fluorine pump systems.

[0003] Evaporative cooling systems utilize the latent heat of water evaporation to reduce air temperature through direct or indirect evaporative cooling. Direct evaporative cooling (DEC) is suitable for dry climates but increases air humidity, while indirect evaporative cooling (IEC) is suitable for environments with strict humidity requirements because it can reduce air temperature without changing the humidity. However, evaporative cooling systems may face freezing issues in low winter temperatures, which require measures such as antifreeze or electric heating.

[0004] Fluorine pump systems transfer heat through the circulation of refrigerants such as Freon, utilizing phase changes during evaporation and condensation. Their advantage is that they operate efficiently even in low-temperature environments, as they achieve cooling through the refrigerant cycle rather than relying on ambient air temperature. However, in high summer temperatures, the energy savings of fluorine pump systems are limited, often requiring mechanical cooling to maintain a suitable equipment room temperature. This can increase energy consumption and pose the risk of high-temperature downtime.

[0005] In general, existing refrigeration systems have trade-offs when pursuing energy savings, and are unable to achieve effective energy savings in all-season conditions, including high and low temperatures. Therefore, the industry currently needs to address the issue of how to effectively combine natural and mechanical cooling technologies to achieve efficient and stable operation of air conditioning systems under these varying conditions. Utility Model Content

[0006] The purpose of the utility model is to provide a dual-cold source air-conditioning unit which can operate efficiently under different climatic conditions and meet energy-saving requirements.

[0007] In order to achieve the above object, the utility model provides a dual-cold source air-conditioning unit, comprising an indoor unit and an outdoor unit, wherein the indoor unit comprises a first heat exchanger and a second heat exchanger arranged in parallel;

[0008] The external unit includes a spray system and a pressure pump system, the spray system includes a sprayer and a water collecting tank, and the pressure pump system includes a compressor, a third heat exchanger, a liquid storage tank, a first delivery pump and a fourth heat exchanger;

[0009] One end of the first heat exchanger is connected to one end of the third heat exchanger via the first delivery pump and the liquid storage tank, and the other end of the first heat exchanger is connected to the other end of the third heat exchanger via the compressor. The pressure pump system further includes a first bypass channel connected in parallel with the compressor and a bypass control component, wherein the bypass control component is used to control the flow of refrigerant through the compressor or the first bypass channel; the liquid storage tank is used to store refrigerant;

[0010] The fourth heat exchanger has a first channel and a second channel, the two ends of the first channel are respectively connected to the sprayer and the water collecting tank; the two ends of the second channel are respectively connected to the two ends of the second heat exchanger; the medium flowing through the first channel and the second channel can exchange heat; the water collecting tank is used to collect water sprayed by the sprayer; the third heat exchanger is located below the sprayer.

[0011] Preferably, the sprinkler, the third heat exchanger and the water collecting tank are arranged in a closed space, an air inlet is provided on one side of the closed space, and an air outlet is provided on the other side of the closed space, the air inlet is provided with an air flow control valve for controlling the flow rate of fresh air, and the air outlet is provided with an exhaust fan, and the convection channel formed by the air inlet and the air outlet passes through the third heat exchanger.

[0012] Preferably, a water spray filler is further provided above the water collecting tank, and the water spray filler can be moved along the water collecting tank so that the water spray filler is opposite to or staggered with the third heat exchanger.

[0013] Preferably, a running roller is provided at the bottom of the water sprinkling filler, and the water sprinkling filler moves along the upper surface of the water collecting tank based on the running roller.

[0014] Preferably, the spraying system also includes a second delivery pump, a first water flow control valve, and a second water flow control valve. The second delivery pump is arranged at the water outlet of the water collecting tank. The second delivery pump is connected to one end of the first channel through the first water flow control valve. The second delivery pump is connected to the sprinkler through the second water flow control valve.

[0015] Preferably, a third delivery pump is further provided on the circulation pipeline between the second channel and the second heat exchanger.

[0016] Preferably, the bypass control component includes a first one-way valve provided on the first bypass channel and a second one-way valve provided on the channel where the compressor is located.

[0017] Preferably, a second bypass channel is provided in parallel at both ends of the first delivery pump, and a third one-way valve is provided on the second bypass channel.

[0018] Preferably, the first delivery pump and the third one-way valve are connected to the first heat exchanger through an expansion valve.

[0019] Preferably, the indoor unit further includes an air supply fan.

[0020] Compared with the prior art, the dual-cold source air-conditioning unit provided by the above technical solution of the utility model can flexibly switch the cooling mode by arranging the first heat exchanger and the second heat exchanger in parallel in the indoor unit, and configuring a pressure plate system connected to the first heat exchanger and a spray system connected to the second heat exchanger in the outdoor unit. The air-conditioning unit can operate in different modes according to different ambient temperatures, so that the air-conditioning unit has good energy-saving effects and high operating reliability under different ambient temperatures, which effectively improves the ability of the air-conditioning unit to adapt to different environmental conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a principle structural diagram of the air-conditioning unit in an embodiment of the present utility model, in which the sprinkler system is not activated.

[0022] Figure 2 This is a schematic structural diagram of an air-conditioning unit in an embodiment of the present invention, wherein the sprinkler system is activated.

[0023] Figure 3 This is a simplified schematic diagram of the air-conditioning unit in mode 1 according to an embodiment of the present invention.

[0024] Figure 4 This is a simplified schematic diagram of the air-conditioning unit in mode 2 according to an embodiment of the present invention.

[0025] Figure 5 This is a simplified schematic diagram of the air-conditioning unit in mode three in an embodiment of the present invention.

[0026] Figure 6 This is a simplified schematic diagram of the air-conditioning unit in mode 4 according to an embodiment of the present invention.

[0027] Figure 7 This is a simplified schematic diagram of the air-conditioning unit in mode five in an embodiment of the present invention.

[0028] Figure 8 This is a simplified schematic diagram of the air-conditioning unit in mode six in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the embodiments and the accompanying drawings.

[0030] This embodiment discloses a dual-cold-source air conditioning unit, which is intended to fully utilize natural energy under different ambient temperature conditions to achieve energy conservation. The air conditioning unit is particularly suitable for use in places that operate continuously throughout the year, such as data centers.

[0031] like Figure 1 The air conditioning unit includes an indoor unit and an outdoor unit. The indoor unit includes a first heat exchanger 10 and a second heat exchanger 11 arranged in parallel. The first heat exchanger 10 and the second heat exchanger 11 are both used to cool the indoor air. When the unit is in operation, depending on the environmental conditions, the outdoor unit controls one of the first heat exchanger 10 and the second heat exchanger 11 to be in an operating state.

[0032] The outdoor unit includes a sprinkler system and a pressure pump system.

[0033] The spraying system includes a sprayer 20 and a water collecting tank 21 .

[0034] The pressure pump system includes a compressor 30 , a third heat exchanger 31 , a liquid storage tank 33 , a first delivery pump M1 and a fourth heat exchanger 32 .

[0035] In this embodiment, the first heat exchanger 10, the second heat exchanger 11, and the third heat exchanger 31 are all single-channel heat exchangers. When the unit is in the cooling state, the first heat exchanger 10 and the second heat exchanger 11 function as evaporators, and the third heat exchanger 31 functions as a condenser. The third heat exchanger 31 is a dual-channel heat exchanger having a first channel L1 and a second channel L2, through which the media flowing through the first channel L1 and the second channel L2 can exchange heat.

[0036] One end of the first heat exchanger 10 is connected to one end of the third heat exchanger 31 via the first delivery pump M1 and the liquid storage tank 33. The other end of the first heat exchanger 10 is connected to the other end of the third heat exchanger 31 via the compressor 30. The pressure pump system also includes a first bypass channel 34 connected in parallel with the compressor 30 and a bypass control component. The bypass control component is used to control the flow of refrigerant through the compressor 30 or the first bypass channel 34. The liquid storage tank 33 is used to store refrigerant.

[0037] In the fourth heat exchanger 32, the ends of the first channel L1 are connected to the sprayer 20 and the water collection tank 21, respectively. The ends of the second channel L2 are connected to the ends of the second heat exchanger 11, respectively. The third heat exchanger 31 is located below the sprayer 20. When the sprayer 20 sprays water mist (or water flow) downward, the water mist is sprayed onto the third heat exchanger 31, accelerating the heat exchange efficiency of the third heat exchanger 31. The water collection tank 21 is used to collect the water sprayed by the sprayer 20 and return it to the first channel L1 of the fourth heat exchanger 32 and the sprayer 20.

[0038] On the other hand, the sprinkler 20, the third heat exchanger 31 and the water collecting tank 21 are arranged in a closed space 4, an air inlet 41 is provided on one side of the closed space 4, and an air outlet 40 is provided on the other side of the closed space 4. The air inlet 41 is provided with an air flow control valve 42 for controlling the flow rate of fresh air, and the air outlet 40 is provided with an exhaust fan 7. The convection channel formed by the air inlet 41 and the air outlet 40 passes through the third heat exchanger 31.

[0039] In this embodiment, the sprinkler 20, the third heat exchanger 31 and the water collecting tank 21 are arranged in a closed space 4, and the air inlet 41 and the air outlet 40 form a convection channel. The third heat exchanger 31 is located in the convection channel. In this way, when the exhaust fan 7 is turned on, the fresh air flows into the closed space 4 through the air inlet 41, and then passes through the third heat exchanger 31 and is discharged from the air outlet 40, thereby effectively increasing the air flow on the surface of the third heat exchanger 31 to improve the heat exchange efficiency of the third heat exchanger 31.

[0040] On the other hand, a water filling material 5 is provided above the water collecting tank 21, and the water filling material 5 can be moved along the water collecting tank 21 so that the water filling material 5 is opposite to or staggered with the third heat exchanger 31. Figure 2 When the sprinkler 20 is activated, the water filling 5 is located directly below the sprinkler 20 and the third heat exchanger 31, so that the higher temperature water left by the third heat exchanger 31 is converted into lower temperature cooling water through the water filling 5 and enters the water collection tank 21. Figure 1 When the sprinkler 20 is not activated, the water spray filler 5 is moved so that the water spray filler 5 is staggered with the third heat exchanger 31, so that the fresh air flow flows more smoothly to the third heat exchanger 31.

[0041] Specifically, a running roller 6 is provided at the bottom of the water spraying filler 5 , and the water spraying filler 5 moves along the upper surface of the water collecting box 21 based on the running roller 6 .

[0042] The sprinkler system also includes a second delivery pump M2, a first water flow control valve S1, and a second water flow control valve S2. The second delivery pump M2 is located at the water outlet of the water collection tank 21 and is connected to one end of the first channel L1 via the first water flow control valve S1. The second delivery pump M2 is also connected to the sprinkler 20 via the second water flow control valve S2. In this embodiment, the second delivery pump M2, the first water flow control valve S1, and the second water flow control valve S2 enable cooling water from the water collection tank 21 to be supplied to the sprinkler 20 or the fourth heat exchanger 32, depending on the operating mode of the air conditioning unit.

[0043] On the other hand, a third delivery pump M3 is further provided on the circulation pipeline between the second channel L2 and the second heat exchanger 11. The third delivery pump M3 pumps the cold water in the second channel L2 of the fourth heat exchanger 32 into the second heat exchanger 11, thereby ensuring the efficiency of the second heat exchanger 11.

[0044] The bypass control element includes a first one-way valve D1 disposed on the first bypass channel 34 and a second one-way valve D2 disposed in the channel where the compressor 30 is located. By controlling the opening and closing of the first and second one-way valves D1 and D2, the refrigerant circulation line of the first heat exchanger 10 can be controlled to flow through the compressor 30 or the first bypass channel 34. When the refrigerant flows through the first bypass channel 34, the compressor 30 is effectively shielded.

[0045] Furthermore, a second bypass channel 35 is provided in parallel at both ends of the first delivery pump M1, and a third one-way valve D3 is provided on the second bypass channel 35. In this embodiment, the second bypass channel 35 and the third one-way valve D3 allow the refrigerant in the liquid storage tank 33 to selectively pass through the first delivery pump M1 or enter the first heat exchanger 10 independently, depending on the operating mode of the air conditioning unit.

[0046] On the other hand, the indoor unit further includes an air supply fan 12 for delivering cold air near the first heat exchanger 10 or the second heat exchanger 11 into the room.

[0047] In summary, the present invention discloses a dual-cooling-source air conditioning unit. By providing a first heat exchanger 10 and a second heat exchanger 11 in parallel in the indoor unit, and configuring a pressure plate system connected to the first heat exchanger 10 and a spray system connected to the second heat exchanger 11 in the outdoor unit, the unit can flexibly switch cooling modes, operating in different modes according to different ambient temperatures. Specifically, the air conditioning unit has six different operating modes, exemplified by the example of a system in which the refrigerant in the liquid storage tank 33 and the compressor 30 is Freon.

[0048] Mode 1: Fluorine pump dry cooling full natural cooling source mode:

[0049] like Figure 3 When the outdoor fresh air temperature is less than T1 (T1 < 0°C), the first delivery pump M1, supply fan 12, and exhaust fan 7 operate, and the sprinkler system does not operate. The first delivery pump M1 delivers the refrigerant to the first heat exchanger 10, where it evaporates and then flows to the third heat exchanger 31 for heat dissipation. At this time, the water spray packing 5 is moved to a position offset from the third heat exchanger 31. In this mode, the air conditioning unit cools the room using a fully natural cooling source.

[0050] Mode 2: Fluorine pump wet cooling full natural cooling source mode:

[0051] like Figure 4When T1 ≤ outdoor fresh air temperature < T2, the first delivery pump M1, supply fan 12, exhaust fan 7, and second delivery pump M2 operate. The first delivery pump M1 delivers refrigerant to the first heat exchanger 10, where it evaporates and then flows to the third heat exchanger 31 for heat dissipation. The first water flow control valve S1 is closed, and the second water flow control valve S2 is opened. The second delivery pump M2 delivers low-temperature water from the water collection tank 21 to the sprayer 20 through the second water flow control valve S2. The sprayer 20 sprays the water onto the third heat exchanger 31, where it evaporates and dissipates heat. The water then cools through the spray packing 5 and returns to the water collection tank 21.

[0052] In this mode, the low-temperature outdoor air and latent heat of water evaporation in winter are used for condensation and heat dissipation, which improves the heat dissipation efficiency and enhances the cooling effect of the all-natural cold source.

[0053] Mode 3, evaporative cooling water natural cooling source mode:

[0054] like Figure 5 When T2 ≤ outdoor fresh air temperature < T3, the supply fan 12, exhaust fan 7, and second delivery pump M2 operate, while the compressor 30 and first delivery pump M1 do not operate. At the same time, the first water flow control valve S1 is opened, and the second water flow control valve S2 is closed and opened. The second delivery pump M2 delivers the low-temperature water from the water collection tank 21 to the first channel L1 of the fourth heat exchanger 32 through the first water flow control valve S1. The low-temperature water in the first channel L1 exchanges heat with the water in the second channel L2, absorbs heat, and returns to the sprinkler 20. It is then cooled by the water spray filler 5 and returned to the water collection tank 21. The cooled cold water in the second channel L2 on the other side of the fourth heat exchanger 32 is delivered to the second heat exchanger 11 by the third delivery pump M3 to cool the high-temperature indoor return air. The hot water that has absorbed heat returns to the fourth heat exchanger 32 for cooling.

[0055] In this mode, the latent heat of outdoor air and water evaporation is used to cool the water, and then the cooling water is used to cool the indoor air, achieving full natural cold source cooling.

[0056] like Figure 6 , Mode 4, evaporative cooling water pressure pump part of the natural cooling source mode:

[0057] When T3 ≤ outdoor fresh air temperature < T4, the supply fan 12, exhaust fan 7, first delivery pump M1, compressor 30, and second delivery pump M2 operate. The first water flow control valve S1 opens, the second water flow control valve S2 closes, and the second delivery pump M2 delivers low-temperature water from the water collection tank 21 through the first water flow control valve S1 to the first channel L1 of the third heat exchanger 31. After absorbing heat, the water returns to the sprinkler 20 and is cooled by the water spray packing 5 before returning to the water collection tank 21. The cooled cold water on the other side of the fourth heat exchanger 32 is delivered by the third delivery pump M3 to the second heat exchanger 11, where it cools the high-temperature return air from the room.

[0058] At this time, the supply air temperature after cooling of the second heat exchanger 11 is higher than the set value. Therefore, the first one-way valve D1 is closed, the second one-way valve D2 is opened, and the first delivery pump M1 sends the refrigerant into the first heat exchanger 10, and flows into the compressor 30 and the third heat exchanger 31, and then flows back to the liquid storage tank 33, thereby starting the first heat exchanger 10 for secondary cooling and cooling to the set supply air temperature.

[0059] In this mode, outdoor air and water evaporation latent heat are mainly utilized, supplemented by fluorine pump refrigeration, to achieve partial natural cold source refrigeration and improve energy utilization efficiency.

[0060] like Figure 7 , Mode 5, air-cooled pressure pump natural cooling source mode:

[0061] When water is scarce or cut off, the spray system can be stopped and the water filling material 5 can be moved to a position offset from the third heat exchanger 31. The compressor 30, the first delivery pump M1, the air supply fan 12, and the exhaust fan 7 are in operation, and cooling is performed through the compressor 30 and the first heat exchanger 10.

[0062] In this mode, outdoor air is used for condensation and heat dissipation when there is a water shortage or water outage.

[0063] like Figure 8 , Mode six, air-cooled pure DX mode:

[0064] When water is scarce or cut off and the outdoor fresh air temperature is higher than the operating temperature of the first delivery pump M1, the spray system can be stopped and the water filling material 5 can be moved to a position offset from the third heat exchanger 31. The compressor 30, supply fan, and exhaust fan 7 will operate, and the first delivery pump M1 will stop operating, operating in a pure DX mode.

[0065] In this mode, the indoor temperature environment is guaranteed when there is a water shortage or water outage and the outdoor temperature is high, but the energy efficiency is low.

[0066] It should be noted that DX mode refers to Direct Expansion (DX) refrigeration mode. Specifically, the DX mode operates as follows: the high-temperature refrigerant gas discharged from compressor 30 condenses into liquid in the condenser. It is then throttled and reduced in pressure by expansion valve P to form a low-temperature gas-liquid mixture. This mixture then flows into the evaporator, absorbs heat, evaporates, and returns to compressor 30, completing a refrigeration cycle. Simultaneously, return air from the room is cooled by the evaporator and then delivered back into the room by the indoor fan.

[0067] Based on the above six working modes, the air-conditioning unit can efficiently utilize natural cooling sources throughout the seasons, while taking into account winter anti-freeze, summer high temperature and risk compensation in water shortage conditions, effectively improving the energy efficiency and reliability of the air-conditioning unit.

[0068] In addition, the specific values ​​of T1, T2, T3, and T4 can be set according to local climate conditions and equipment room requirements.

[0069] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A dual-cold source air conditioning unit, characterized in that: The device comprises an indoor unit and an outdoor unit, wherein the indoor unit comprises a first heat exchanger and a second heat exchanger arranged in parallel; The external unit includes a spray system and a pressure pump system, the spray system includes a sprayer and a water collecting tank, and the pressure pump system includes a compressor, a third heat exchanger, a liquid storage tank, a first delivery pump and a fourth heat exchanger; One end of the first heat exchanger is connected to one end of the third heat exchanger via the first delivery pump and the liquid storage tank, and the other end of the first heat exchanger is connected to the other end of the third heat exchanger via the compressor. The pressure pump system further includes a first bypass channel connected in parallel with the compressor and a bypass control component, wherein the bypass control component is used to control the flow of refrigerant through the compressor or the first bypass channel; the liquid storage tank is used to store refrigerant; The fourth heat exchanger has a first channel and a second channel, the two ends of the first channel are respectively connected to the sprayer and the water collecting tank; the two ends of the second channel are respectively connected to the two ends of the second heat exchanger; the medium flowing through the first channel and the second channel can exchange heat; the water collecting tank is used to collect water sprayed by the sprayer; the third heat exchanger is located below the sprayer.

2. The dual-cold source air conditioning unit according to claim 1, characterized in that: The sprinkler, the third heat exchanger and the water collecting tank are arranged in a closed space, an air inlet is provided on one side of the closed space, and an air outlet is provided on the other side of the closed space, the air inlet is provided with an air flow control valve for controlling the flow rate of fresh air, and the air outlet is provided with an exhaust fan, and the convection channel formed by the air inlet and the air outlet passes through the third heat exchanger.

3. The dual-cold source air conditioning unit according to claim 1, characterized in that: A water spray filler is further provided above the water collecting tank, and the water spray filler can be moved along the water collecting tank so that the water spray filler is opposite to or staggered with the third heat exchanger.

4. The dual-cold source air conditioning unit according to claim 3, characterized in that: A walking roller is provided at the bottom of the water sprinkling filler, and the water sprinkling filler moves along the upper surface of the water collecting tank based on the walking roller.

5. The dual-cold-source air-conditioning unit according to claim 1, characterized in that: The spraying system also includes a second delivery pump, a first water flow control valve, and a second water flow control valve. The second delivery pump is arranged at the water outlet of the water collecting tank. The second delivery pump is connected to one end of the first channel through the first water flow control valve. The second delivery pump is connected to the sprinkler through the second water flow control valve.

6. The dual-cold-source air-conditioning unit according to claim 1, characterized in that: A third delivery pump is further provided on the circulation pipeline between the second channel and the second heat exchanger.

7. The dual-cold-source air-conditioning unit according to claim 1, characterized in that: The bypass control component includes a first one-way valve provided on the first bypass channel and a second one-way valve provided on the channel where the compressor is located.

8. The dual-cold-source air-conditioning unit according to claim 1, characterized in that: A second bypass channel is provided in parallel at both ends of the first delivery pump, and a third one-way valve is provided on the second bypass channel.

9. The dual-cold-source air-conditioning unit according to claim 8, characterized in that: The first delivery pump and the third one-way valve are connected to the first heat exchanger through an expansion valve.

10. The dual-cold-source air-conditioning unit according to claim 1, characterized in that: The indoor unit also includes an air supply fan.

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