Mixed air cooling system

Abstract

The invention provides a mixed air cooling system. The mixed air cooling system comprises a mixed air cooling condenser, an outdoor unit fan, a water distribution device and a circulating water device. The water distribution device is installed above the mixed air-cooled condenser and used for evenly distributing condensate water to the mixed air-cooled condenser. The outdoor unit fan is mounted on the side of the mixed air-cooled condenser and used for feeding natural air into the mixed air-cooled condenser; the circulating water device is mounted below the mixed air-cooled condenser and is used for recycling condensed water; and the mixed air-cooled condenser is a finned tube type condenser and is used for cooling the refrigerant. According to the mixed air cooling system, the advantages of a dry type air cooling condenser and an evaporative type condenser are combined, dry-wet mixed condensation is achieved, the system is further provided with an improved filtering device, and the waste water amount can be greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning and refrigeration, and in particular to a mixed air cooling system. Background Art

[0002] In the field of air conditioning and refrigeration technology, there are several physical solutions that can produce a cooling effect: vapor compression, absorption, thermoelectricity, etc. Among them, vapor compression is the most popular because it is simple, economical, flexible and stable. By choosing different components and designs, it can be applied to a very large capacity and temperature range. Its basic principle is reverse thermodynamics, that is, a certain amount of heat is transferred from a heat source with a lower temperature to a heat source with a higher temperature by consuming a certain amount of energy. The cycle has four main stages: (1) low-temperature expansion and heat absorption (evaporator); (2) adiabatic vapor compression and temperature increase (compressor); (3) high-temperature condensation and heat rejection (condenser); (4) adiabatic expansion and pressure reduction / temperature reduction (expansion valve).

[0003] High-temperature condensation heat removal (i.e., the third stage mentioned above) can be achieved through a heat exchanger, which can release heat to a heat source fluid, which is usually air or water.

[0004] In most applications, air is the heat source fluid of choice due to the unlimited availability of wind. In such cases, a dry air-cooled condenser is used to achieve the aforementioned third stage of heat removal, releasing heat directly into the air. However, due to air's low density, low specific heat capacity, and poor heat transfer performance, achieving the required heat removal requires moving large volumes of air, increasing the temperature difference between the fluids and limiting the size and cost of the dry air-cooled condenser. Due to the low efficiency and high condensing temperature of dry air-cooled condensers, these condensers present the following challenges: low overall cooling system efficiency, limited maximum operating ambient temperature, and high maximum system power input.

[0005] Another solution is to use only a wet heat exchange air-cooled condenser (i.e., an evaporative condenser). However, an evaporative condenser can only operate when there is water, so there are the following problems: high annual water consumption and maximum water consumption, the system cannot operate when there is no water, the efficiency decreases when the air temperature is low, and it will freeze at negative temperatures, resulting in high standby power consumption. Summary of the Invention

[0006] An embodiment of the present application provides a hybrid air-cooling system that combines the advantages of a dry air-cooled condenser and an evaporative condenser to achieve dry-wet mixed condensation. The system also has an improved filtering device, which can greatly reduce the amount of wastewater.

[0007] An embodiment of the present application provides a mixed air cooling system, which includes a mixed air cooling condenser, an outdoor unit fan, a water distribution device and a circulating water device; the water distribution device is installed above the mixed air cooling condenser, and is used to evenly distribute the condensed water on the mixed air cooling condenser; the outdoor unit fan is installed on the side of the mixed air cooling condenser, and is used to send natural air into the mixed air cooling condenser; the circulating water device is installed below the mixed air cooling condenser, and is used to recycle the condensed water; the mixed air cooling condenser is a fin-tube type condenser, and is used to cool the refrigerant.

[0008] In one embodiment, the water distribution system includes a spray pipe, and the spray pipe includes a plurality of water distribution holes of the same size, and the spacing between each of the water distribution holes is the same.

[0009] In one embodiment, when the ambient temperature is lower than a temperature threshold, the water distribution system is in a closed state, and the hybrid air-cooled condenser is cooled only by the outdoor unit fan.

[0010] In one embodiment, the circulating water device includes a water tank and a main water pump; the water tank is connected to the mixed air-cooled condenser for receiving the condensed water; the main water pump is connected to the water tank for transporting the condensed water to the water distribution system.

[0011] In one embodiment, the circulating water device also includes a return water filter and a water tank drain valve; one end of the return water filter is connected to the water tank, and the other end is connected to the mixed air-cooled condenser, and is used to filter the first impurities in the condensed water; the water tank drain valve is installed below the water tank, and is used to discharge the waste water in the water tank.

[0012] In one embodiment, the circulating water device also includes a water quality sensor and a filtering device; the water quality sensor is installed in the water tank to monitor the solute ion concentration of the condensed water; one end of the filtering device is connected to the main water pump and the other end is connected to the water tank to filter the second impurities in the condensed water.

[0013] In one embodiment, the filtering device includes a bypass regulating valve and a fresh water filter; the bypass regulating valve is connected to the main water pump for controlling the flow direction of the condensed water; one end of the fresh water filter is connected to the bypass regulating valve and the other end is connected to the water tank for filtering the second impurities in the condensed water and transporting the filtered condensed water to the water tank; when the solute ion concentration is greater than the concentration threshold, the bypass regulating valve is in an open state, and the second impurities in the condensed water are filtered through the fresh water filter.

[0014] In one embodiment, the filtering device further includes a fresh water regulating valve, a fresh water pump, a fresh water valve and a fresh water drain valve; the fresh water regulating valve is connected to the fresh water pump for providing the condensed water; one end of the fresh water valve is connected to the fresh water pump and the other end is connected to the fresh water filter for controlling the water storage amount in the water tank; the fresh water drain valve is installed below the fresh water filter for discharging waste water from the fresh water filter.

[0015] In one embodiment, the fresh water filter is a nano filter or a reverse osmosis filter.

[0016] In one embodiment, the circulating water device also includes a water level sensor; the water level sensor is installed in the water tank and is used to monitor the water level in the water tank; when the water level exceeds a height threshold, the water tank drain valve is in an open state, and the water level is lowered through the water tank drain valve.

[0017] The above-described embodiments of the present application provide a hybrid air-cooling system that combines the advantages of a dry air-cooled condenser and an evaporative condenser to achieve dry-wet mixed condensation. Furthermore, the system includes an improved filtration device, significantly reducing wastewater volume. In winter, for example, when the ambient temperature is below 0°C, the system can operate without water, significantly improving the availability of the air-cooling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application.

[0019] Figure 1 is a schematic diagram of a hybrid air cooling system provided in an embodiment of the present application;

[0020] Figure 2 is a schematic diagram of a sprinkler provided in an embodiment of the present application;

[0021] Figure 3 This is a schematic diagram of a hybrid air cooling system with a filtering device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0023] Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0024] In the field of traditional air conditioning and refrigeration technology, all refrigeration systems based on vapor compression require a condenser to release heat to the heat source. The main condensers are dry air-cooled condensers and evaporative condensers.

[0025] Dry air-cooled condensers release heat directly into the air. However, in the summer, the ambient dry-bulb temperature (air temperature) can be very high, and the refrigerant temperature can reach levels that are detrimental to operation and efficiency. Consequently, dry air-cooled condensers have low overall cooling system efficiency, limited maximum operating ambient temperatures, and high maximum system input power.

[0026] Evaporative condensers must operate in a water environment, and their total water consumption consists of evaporated water and wastewater. Wastewater is the water released when the salt concentration reaches a certain limit after evaporation. For evaporative condensers, wastewater typically accounts for 25% to 35% of the total consumption and depends on the quality of the water supplied. If the wastewater volume is restricted, the condenser will scale and performance will decline. Another way to control scaling is to increase the water flow rate to ensure that the entire condenser surface is continuously wetted and flushed with an excess of water. As a result, evaporative condensers have high annual and maximum water consumption, the system cannot operate in the absence of water, efficiency decreases at low air temperatures, and ice forms at negative air temperatures, resulting in high standby power consumption.

[0027] In view of this, in order to solve the above problems, an embodiment of the present application provides a hybrid air-cooling system, which combines the advantages of a dry air-cooled condenser and an evaporative condenser to achieve dry-wet mixed condensation, and the system is also equipped with an improved filtering device, which can greatly reduce the amount of wastewater.

[0028] Figure 1 This is a schematic diagram of a hybrid air cooling system provided in an embodiment of the present application. Figure 1 In the embodiment, the hybrid air-cooling system includes a hybrid air-cooling condenser 10, an outdoor fan 20, a water distribution device 30, and a water circulation device 40. The water distribution device 30 is installed above the hybrid air-cooling condenser 10 to evenly distribute the condensed water on the hybrid air-cooling condenser 10. The outdoor fan 20 is installed to the side of the hybrid air-cooling condenser 10 to supply natural air to the hybrid air-cooling condenser 10. The water circulation device 30 is installed below the hybrid air-cooling condenser 10 to circulate the condensed water. The hybrid air-cooling condenser 10 is a fin-tube type condenser used to cool the refrigerant.

[0029] In one embodiment, the water distribution system 30 may be a sprinkler pipe. Figure 2This is a schematic diagram of a sprayer provided in an embodiment of the present application. The spray pipe includes multiple water diversion holes 301 of equal size, with the spacing between each water diversion hole 301 being equal. The total length and width of the sprayer are related to the size of the mixed air-cooled condenser 10. The width of the water diversion hole 301 is greater than or equal to 0.1 mm and less than or equal to 100 mm. The spacing between each water diversion hole 301 is greater than or equal to 0.1 mm and less than or equal to 50 mm. The length of the water diversion hole 301 is greater than or equal to 5 mm and less than or equal to 500 mm.

[0030] Spray pipes distribute a small stream of water evenly across single or multiple large condensers. These can be made of metal or plastic tubing with multiple openings along its axis, creating a film of water that wets the condenser's surfaces. The spray pipes should wet all fin surfaces along the coil's length, particularly the outer surfaces. Here, the descending / evaporating water lowers the condenser temperature to near the ambient wet-bulb temperature, cooling the liquid refrigerant and increasing the subcooling by several degrees. The water flow rate can be fixed or variable to adjust the condenser's cooling effect. It can also be adjusted to balance heat transfer efficiency with the associated power input and water consumption.

[0031] In one embodiment, when the ambient temperature is below a temperature threshold, the water distribution system 30 is in a closed state, and the hybrid air-cooled condenser 10 is cooled only by the outdoor unit fan 20. The temperature threshold can be set according to different circumstances, for example, it can be set to 0°C. At temperatures below 0°C, water will freeze, and a traditional evaporative condenser will not function. However, the hybrid air-cooling system of the embodiment of the present application can cool the hybrid air-cooled condenser only by the outdoor unit fan, and can still operate normally at negative temperatures.

[0032] Figure 3 This is a schematic diagram of a mixed air cooling system with a filtering device provided in an embodiment of the present application. Figure 3In the figure, the hybrid air-cooling system includes a hybrid air-cooling condenser 10, an outdoor unit fan 20, a water distribution device 30, and a circulating water device 40. The circulating water device 40 includes a water tank 401 and a main water pump 402; the water tank 401 is connected to the hybrid air-cooling condenser 10 for receiving condensed water; the main water pump 402 is connected to the water tank 401 for transporting the condensed water to the water distribution system 30. The circulating water device also includes a return water filter 403 and a water tank drain valve 404; one end of the return water filter 403 is connected to the water tank 401 and the other end is connected to the hybrid air-cooling condenser 10 for filtering the first impurities in the condensed water. The first impurities can be solid particulate matter, generally solids such as dust carried in the natural wind brought by the outdoor unit fan 20. The water tank drain valve 404 is installed below the water tank 401 for discharging waste water from the water tank. The circulating water device 40 also includes a water quality sensor 405 and a filtering device; the water quality sensor 405 is installed in the water tank 401 and is used to monitor the solute ion concentration of the condensed water; one end of the filtering device is connected to the main water pump 402 and the other end is connected to the water tank 401, and is used to filter the second impurities in the condensed water. The second impurities can be metal ions, such as calcium (Ca) ions and magnesium (Mg) ions. These metal ions cannot be removed by the return water filter 403, so they will cause scale to form on the surface of the mixed air-cooled condenser 10, reducing the condensation efficiency. However, the filtering device of the embodiment of the present application can effectively remove these metal ions in the condensed water.

[0033] The filtering device includes a bypass regulating valve 406 and a fresh water filter 407; the bypass regulating valve 406 is connected to the main water pump 402 for controlling the flow direction of the condensed water; one end of the fresh water filter 407 is connected to the bypass regulating valve 406 and the other end is connected to the water tank 401 for filtering the second impurities in the condensed water and transporting the filtered condensed water to the water tank 401; when the solute ion concentration is greater than the concentration threshold, the bypass regulating valve 406 is in an open state, and the second impurities in the condensed water are filtered through the fresh water filter 407. The filtering device also includes a fresh water regulating valve 408, a fresh water pump 409, a fresh water valve 410 and a fresh water drain valve 411; the fresh water regulating valve 408 is connected to the fresh water pump 409 for providing condensed water; one end of the fresh water valve 410 is connected to the fresh water pump 409 and the other end is connected to the fresh water filter 407 for controlling the water storage amount in the water tank 401; the fresh water drain valve 411 is installed below the fresh water filter 407 for discharging waste water from the fresh water filter 407.

[0034] The circulating water device 40 also includes a water level sensor 412; the water level sensor 412 is installed in the water tank 410 and is used to monitor the water level in the water tank 410; when the water level exceeds the height threshold, the water tank drain valve 404 is in an open state, and the water level is lowered through the water tank drain valve 404.

[0035] In the prior art, standard evaporative condenser designs typically increase height to accommodate a larger condenser within a smaller footprint, but this requires increased pump head and power input. With a fixed height and water flow rate, the pump typically runs at full speed to avoid scaling, even at part-load operation, where the pump's power input becomes a more significant component of the overall system power. To enhance heat transfer between the water, air, and condenser surfaces, the fluid flows are typically reversed: air flows upward and water flows downward, both flowing outside the condenser tubes. Refrigerant typically flows from top to bottom within the condenser tubes, with the tubes sloped to facilitate the flow of condensing water without flooding the internal surfaces and degrading condenser performance. When the refrigerant reaches a saturated liquid state, it leaves the condenser without being overcooled. However, to control costs, the condenser surface is typically limited. To compensate for the lowest surface area, air and water flow rates are increased to enhance heat transfer across the condenser surface, increasing the temperature difference between the air leaving temperature and the condensing temperature. This simultaneously lowers the water temperature in the cooling tubes and, during this time, is cooled by the evaporating water from the flowing air. However, higher water flow requires greater pump power input, and fan power input also increases. This is because the increased air flow increases the pressure drop encountered by air moving through a small condenser and the air must contend with water flowing in the opposite direction within the same condenser. Consequently, the total condenser power input increases and often approaches the compressor power input, especially when the system operates at part load for the majority of its operating time. This penalty is exacerbated in data center applications, where systems are oversized to achieve higher efficiency at full load and maintain margin under critical operating conditions. Increased air flow reduces the outlet air temperature. In oversized condensers (where the gap between the inlet air wet-bulb temperature and the refrigerant condensing temperature is smaller), the outlet air dry-bulb temperature often falls below the inlet air dry-bulb temperature. In this case, a portion of the evaporated water only cools the air, and actual water consumption is often higher than estimated because water consumption calculations are calibrated for a larger approach temperature, based solely on the wet-bulb temperature, and assuming that most of the evaporated water is used to absorb the condenser's heat load.

[0036] Based on the above, in one embodiment, various technologies are used to expand the condenser surface, thereby limiting the required water and air flows, reducing pump head, air pressure drop, and water consumption. Conventional evaporative condensers only provide adequate cooling capacity in winter and in very low ambient temperatures. However, the larger condenser surface in this embodiment enables the system to operate under all conditions, even in the absence of water. Finned tube condensers replace condensers constructed solely of pipes, expanding the air-side surface and cooling capacity. Specifically, it can bring the following effects: (1) Use smaller pipes to obtain the same cooling capacity, reducing the total material weight and cost; (2) Limit the volume of the condenser pipe to limit the refrigerant charge; (3) Limit the height of the condenser, thereby limiting the water pump head and input power; (4) Reduce water flow, thereby reducing the water pump size, cost and input power; (6) Expand the front / cross surface of the condenser to reduce pressure drop and fan power input; (7) Reduce water consumption by limiting airflow and reducing the "subcooling" of the outlet air temperature; (8) Traditional evaporative condensers can only operate in wet (wet bulb heat exchange at high ambient temperature) mode, while dry condensers can operate at medium / low ambient temperature, thereby reducing water consumption; (9) Add a subcooling degree on the liquid outlet side of the condenser to increase system energy efficiency.

[0037] In the related art, when operating at low water flow, some areas of the condenser may dry out temporarily, leading to scaling and fouling. This requires minimizing the solute components (mainly Ca and Mg) in the water flow on the condenser surface to reduce the risk. Depending on the phenomenon, there are several solutions to reduce water hardness: (1) MSF and MED (Multi-stage Flash Distillation and Multi-effect Distillation): This is a thermal process that distills water by boiling under vacuum conditions and then condenses the pure water vapor. They use shell and tube heat exchangers to achieve multi-stage distillation. MSF and MED were mainly used in seawater desalination in the past, but their application range is shrinking due to high power consumption and high installation costs. (2) ED (Electrodialysis): This is a well-known method for removing salt from liquids with various applications, especially for seawater desalination. Electrodialysis is based on selective polar membranes that separate ions when an electric field is applied. The basic efficiency is very low (about 50% of the water is wasted). More complex solutions (reverse electrolysis, additional ultrasonic effects or chemical treatment) can achieve an efficiency of around 70-80%, but the cost is quite high. (3) Magnetic filter: It can only be used as an additional treatment method to reduce the risk of calcium carbonate (CaCO3) scaling, with a maximum efficiency of 60%. It does not remove ions from the water, but only changes the structure of the scale from calcite (more sticky and harder) to aragonite (less sticky and softer). Aragonite also stays in the water longer after formation, so it needs to be treated anyway. It can be installed at the outlet of the water pump (usually an option for evaporative condensers). (4) Electric filter: It has potential for high efficiency, low cost and low power consumption, but there is currently no commercial and reliable application. (5) Water softener: This is a very popular solution for reducing water hardness, replacing Ca and Mg ions with different components (usually sodium (Na) or phosphorus (P)), which have a higher solubility in water and a low risk of scaling. In this application, this method can be considered to limit scaling, but there is a residual risk of corrosion due to the ions in the water. In addition, it requires ongoing maintenance.

[0038] Based on the above, in one embodiment, the fresh water filter 407 is a nano filter or a reverse osmosis filter.

[0039] Reverse Osmosis (RO): Based on a semipermeable membrane (a membrane placed in a pressure vessel), it allows water to permeate but rejects dissolved components. The pressure on the inlet side of the membrane is higher than the osmotic pressure to generate a permeate flow. The reverse osmosis process is typically driven by a variable-speed pump to generate the required inlet pressure. Membranes vary in permeability and solids separation efficiency, requiring high pressure to separate all dissolved components and provide pure water.

[0040] Nanofiltration (Nanofiltration): Similar to reverse osmosis, but with a more permeable membrane, it requires lower pressure to operate. It separates all solids and particles from the water except monovalent ions. Most divalent cations (such as Ca++ and Mg++, which cause scaling) are also removed from the filtered water. Removing all bacteria and viruses prevents related diseases (particularly Legionella), which can thrive in warm water and is a key issue for cooling towers and evaporative condensers. Therefore, even if there are some water droplets in the exhaust air, the residual disease risk is very low, so there is no need to install a drift eliminator, which increases the air pressure drop and fan power input of the evaporative condenser.

[0041] Nanofilters or reverse osmosis filters can be used to reduce incoming ions, filter all fresh water, and limit concentrations caused by evaporation, filtering some of the circulating water in the system. To this end, a freshwater regulating valve 408 is installed on the water supply pipe before the freshwater pump inlet, and a bypass regulating valve 406 is installed on the water supply pipe between the main pump outlet pipe and the freshwater pump inlet. When the solute ion concentration measured by the water quality sensor 405 in the water tank 401 reaches the limit, the freshwater regulating valve 408 closes (or partially closes) and the bypass regulating valve 406 opens (or partially opens), allowing the water in the water tank 401 to pass through the freshwater filter 407 (a nanofilter or reverse osmosis filter) for cleaning. The freshwater filter 407 separates clean water with low ion content from purified water with high salt content, and the purified water is released through the freshwater drain valve 411. The water quality sensor 405 installed in the water tank 401 continuously controls the ion concentration in the water system.

[0042] The embodiment of the present application integrates a high efficiency filter. It is estimated that the wastewater volume accounts for about 15-20% of the total consumption, while a standard evaporative condenser usually requires 25-35%.

[0043] In one embodiment, the hybrid air-cooled condenser 10 is a fin-and-tube condenser, specifically a surface cooler fin with horizontal windows. This provides more regular airflow perpendicular to the coil, resulting in higher average high temperatures, better surface utilization, lower top velocities, and less risk of water flowing into the fan. It also increases turbulence and heat transfer at edges and surfaces. It also improves water flow distribution within the water channel. If the top water distribution device 30 is locked in certain areas, water flow will be reduced, potentially reducing or eliminating water flow to some fins while leaving excess water on adjacent fins. The windows allow water to flow from one water channel to another, making water flow distribution more uniform across all fin channels and improving thermal resistance. It also creates an irregular path for falling water, improving water distribution (without fins, water would slide and accumulate on the outer edges of the fins at low wind speeds and on the inner edges at high wind speeds). This makes the relationship between fan / wind speed and fin wetted surface more proportional. It also improves the water retention of the fins, causing water droplets to settle on the window frame rather than falling along standard smooth fins.

[0044] The above-described embodiments of the present application provide a hybrid air-cooling system that combines the advantages of a dry air-cooled condenser and an evaporative condenser to achieve dry-wet mixed condensation. Furthermore, the system includes an improved filtration device, significantly reducing wastewater volume. In winter, for example, when the ambient temperature is below 0°C, the system can operate without water, significantly improving the availability of the air-cooling system.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hybrid air cooling system, characterized in that: The mixed air cooling system includes a mixed air cooling condenser, an outdoor unit fan, a water distribution device and a circulating water device; The water distribution device is installed above the mixed air-cooled condenser and is used to evenly distribute the condensed water on the mixed air-cooled condenser; The outdoor fan is installed on the side of the mixed air-cooled condenser and is used to send natural wind into the mixed air-cooled condenser; The circulating water device is installed below the mixed air-cooled condenser and is used to circulate the condensed water; The mixed air-cooled condenser is a fin-tube type condenser, which is used to cool the refrigerant.

2. The hybrid air cooling system according to claim 1, characterized in that: The water distribution system includes a spray pipe, and the spray pipe includes a plurality of water distribution holes of the same size, and the spacing between each of the water distribution holes is the same.

3. The hybrid air cooling system according to claim 1, characterized in that: When the ambient temperature is lower than the temperature threshold, the water distribution system is in a closed state, and the mixed air-cooled condenser is cooled only by the outdoor unit fan.

4. The hybrid air cooling system according to claim 1, characterized in that: The circulating water device includes a water tank and a main water pump; The water tank is connected to the mixed air-cooled condenser and is used to receive the condensed water; The main water pump is connected to the water tank and is used to transport the condensed water to the water distribution system.

5. The hybrid air cooling system according to claim 4, characterized in that: The circulating water device also includes a return water filter and a water tank drain valve; One end of the return water filter is connected to the water tank, and the other end is connected to the mixed air-cooled condenser, and is used to filter the first impurities in the condensed water; The water tank drain valve is installed below the water tank and is used to drain waste water in the water tank.

6. The hybrid air cooling system according to claim 4, characterized in that: The circulating water device also includes a water quality sensor and a filtering device; The water quality sensor is installed in the water tank and is used to monitor the solute ion concentration of the condensed water; One end of the filtering device is connected to the main water pump, and the other end is connected to the water tank, and is used to filter the second impurities in the condensed water.

7. The hybrid air cooling system according to claim 6, wherein the filtering device comprises a bypass regulating valve and a fresh water filter; The bypass regulating valve is connected to the main water pump and is used to control the flow direction of the condensed water; One end of the fresh water filter is connected to the bypass regulating valve, and the other end is connected to the water tank, for filtering the second impurities in the condensed water and delivering the filtered condensed water to the water tank; When the solute ion concentration is greater than a concentration threshold, the bypass regulating valve is in an open state, and the second impurities in the condensed water are filtered through the fresh water filter.

8. The hybrid air cooling system according to claim 7, characterized in that: The filtering device also includes a fresh water regulating valve, a fresh water pump, a fresh water valve and a fresh water drain valve; The fresh water regulating valve is connected to the fresh water pump to provide the condensed water; One end of the fresh water valve is connected to the fresh water pump, and the other end is connected to the fresh water filter, for controlling the water storage amount in the water tank; The fresh water drain valve is installed below the fresh water filter and is used to drain waste water from the fresh water filter.

9. The hybrid air cooling system according to claim 7, characterized in that: The fresh water filter is a nano filter or a reverse osmosis filter.

10. The hybrid air cooling system according to claim 5, characterized in that: The circulating water device also includes a water level sensor; The water level sensor is installed in the water tank and is used to monitor the water level in the water tank; When the water level exceeds a height threshold, the water tank drain valve is in an open state, and the water level is lowered through the water tank drain valve.

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