Cooling system based on natural cold resources

Abstract

The utility model provides a cooling system based on natural cold resources, which comprises a dry cooling part, a wet cooling part and a mechanical refrigeration part, and the dry cooling part comprises a heat exchanger; the wet cooling part is provided with a spraying device, a wet cooling coil pipe, a spraying cooling mechanism and a water pan from top to bottom; the mechanical refrigeration part comprises a ventilation wall tail end; the spraying device is connected with the spraying water pump and the water pan to form a loop; compared with the prior art, the heat dissipation air channel is formed by the dry cooling part and the spray cooling mechanism, so that natural cold resources are effectively utilized to realize heat exchange between spray water and the heat exchanger; the tail end of the ventilation wall is connected with the heat exchanger and the wet cooling coil pipe to form a cold water circulation loop, the heat exchanger and the wet cooling coil pipe are connected in series, in parallel or independently connected in the cold water circulation loop through corresponding valves and pipelines in different operation modes, the structure is simple, and operation under different working conditions can be well achieved through natural cold resources. The energy efficiency of the cooling system is effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of air - conditioner cooling control, and more specifically, to a cooling system based on natural cold resources. Background Art

[0002] Existing water - chillers usually have the disadvantages of large heat generation and high heat - generation density, resulting in high energy consumption of the water - chiller and the cooling system formed by combining the water - chiller with other units, and thus unable to meet the requirements of green energy. At the same time, in the prior art, there are also refrigeration methods such as DPC liquid - cooling systems, heat - pipe cooling, and indirect evaporative - cooling AHUs. These refrigeration methods can reasonably utilize natural cold sources to assist heat exchange in the transitional season and can reduce energy consumption to a certain extent. However, the structures of such systems are complex, and the production, use, and maintenance costs are relatively high, and they cannot make the most of natural cold sources. Summary of the Utility Model

[0003] The utility model aims to overcome at least one defect of the above - mentioned prior art, and provides a cooling system based on natural cold resources, which can effectively utilize natural cold sources to achieve cooling, reduce the energy consumption of the cooling system, and has a simple structure, thereby reducing the production and maintenance costs.

[0004] The technical solution adopted by the utility model is as follows:

[0005] The utility model provides a cooling system based on natural cold resources, and the cooling system includes a dry - cooling part, a wet - cooling part, and a mechanical - refrigeration part arranged in sequence;

[0006] The dry - cooling part includes a heat exchanger;

[0007] The wet - cooling part is respectively provided with a spraying device, a wet - cooling coil, a spray - cooling mechanism, and a water - receiving tray from top to bottom;

[0008] The mechanical - refrigeration part includes a wind - wall terminal; the wind - wall terminal is used for cooling the indoor environment;

[0009] The spraying device is connected to the water - receiving tray through a spraying pipeline provided with a spraying water pump;

[0010] The top of the dry - cooling part is provided with an air - exhaust port, an air - exhaust fan is arranged at the air - exhaust port, an air duct penetrating both sides of the spray - cooling mechanism is arranged in the spray - cooling mechanism, and the bottom of the dry - cooling part is communicated with one side of the spray - cooling mechanism;

[0011] The end of the air wall is connected to the heat exchanger and the wet cooling coil through a return water pipeline and a feed water pipeline to form a chilled water circulation loop. Among them, the return water pipeline is connected to the water inlets of the heat exchanger and the wet cooling coil through a dry return water branch and a wet return water branch respectively, and the feed water pipeline is connected to the water outlets of the heat exchanger and the wet cooling coil through a dry feed water branch and a wet feed water branch respectively; a chilled water pump is arranged on the return water pipeline.

[0012] A first valve is arranged on the dry return water branch, a second valve is arranged on the wet return water branch, a third valve is arranged on the dry feed water branch, the water outlet of the heat exchanger is connected to the water inlet of the wet cooling coil through an intermediate branch. One end of the intermediate branch is connected to the dry feed water branch between the water outlet of the heat exchanger and the third valve, and the other end is connected to the wet return water branch between the water inlet of the wet cooling coil and the second valve. A fourth valve is arranged on the intermediate branch.

[0013] The cooling system is also provided with a controller, and the controller is electrically connected to each valve, the spraying device, the end of the air wall, the spraying water pump, the chilled water pump and the exhaust fan respectively.

[0014] Through the air ducts formed on both sides of the spraying cooling mechanism, under the power action of the heat dissipation exhaust fan, the air is introduced into the dry cooling part through the spraying cooling mechanism and exchanges heat with the heat exchanger in the dry cooling part, effectively realizing the cooling of the chilled water by using natural wind; at the same time, if the refrigeration requirement is not met, the spraying device can be turned on for further cooling. The spraying water sprayed by the spraying device passes through the wet cooling coil, can cool the chilled water in the wet cooling coil, and then the spraying water further falls into the spraying cooling mechanism, exchanges heat with the air passing through both sides of the spraying cooling mechanism in the spraying cooling mechanism, can realize the cooling of the spraying water, and the cooled spraying water further falls into the water receiving tray to realize the circulation of the spraying water; in addition, through the combination of specific pipelines and valves, the heat exchanger and the wet cooling coil are connected in series, in parallel or singly connected to the pipeline, realizing the switching of multiple cooling modes, with a simple structure and being able to effectively utilize natural cold resources to cool the chilled water, reducing the energy consumption of the cooling system and also reducing the production and maintenance costs.

[0015] Further, a mechanical coil is also arranged in the wet cooling part, and the mechanical coil is arranged between the wet cooling coil and the spraying cooling mechanism.

[0016] The mechanical refrigeration part also includes a compressor and an evaporator; the controller is electrically connected to the compressor.

[0017] The compressor, the mechanical coil and the evaporator are connected through a refrigerant pipeline to form a refrigerant circulation loop.

[0018] The evaporator is connected to the water inlet pipe through a first mechanical water inlet branch and a mechanical water return branch, and the evaporator is connected to the water return pipe through a second mechanical water inlet branch to introduce the chilled water into the evaporator for heat exchange with the refrigerant; the chilled water pump is arranged between the second mechanical water inlet branch and the water outlet of the end of the air wall.

[0019] A fifth valve is arranged on the first mechanical water inlet branch, a sixth valve is arranged on the second mechanical water inlet branch, and a seventh valve is arranged between the connection ends of the first mechanical water inlet branch and the mechanical water return branch on the water inlet pipe.

[0020] A mechanical refrigeration system is further arranged in the cooling system. The mechanical coil of the mechanical refrigeration system is arranged in the wet cooling part, and at the same time, the mechanical coil is arranged below the wet cooling coil. After the spray water exchanges heat with the wet cooling coil, it falls into the area where the mechanical coil is located, and can further utilize the spray water to exchange heat with the refrigerant in the mechanical coil to reduce the energy consumption of the cooling system; and the refrigerant after heat exchange can exchange heat with the chilled water in the chilled water circulation loop through the evaporator to improve the refrigeration efficiency of the cooling system.

[0021] Furthermore, an air inlet is opened at the top of the wet cooling part.

[0022] One side of the upper region of the spray cooling mechanism of the wet cooling part is communicated with the dry cooling part.

[0023] By opening an air inlet at the top of the wet cooling part and communicating one side of the upper region of the spray cooling mechanism with the dry cooling part, under the action of the exhaust fan in the dry cooling part, outdoor fresh air can be introduced into the wet cooling part through the air inlet to exchange heat with the wet cooling coil and the mechanical coil in the wet cooling part, further utilizing natural cold resources and improving the energy efficiency of the cooling system.

[0024] Furthermore, the evaporator is a plate evaporator.

[0025] Furthermore, the spray cooling mechanism is made of PVC filler, which is set as a porous structure in the horizontal direction, and a number of air ducts penetrating both sides of the spray cooling mechanism are arranged in the horizontal direction.

[0026] Furthermore, the cooling system further includes an outdoor wet bulb temperature sensor and an outdoor dry bulb temperature sensor, which are respectively used for detecting the outdoor wet bulb temperature and dry bulb temperature.

[0027] The outdoor wet bulb temperature sensor and the outdoor dry bulb temperature sensor are respectively electrically connected to the controller.

[0028] Further, a water inlet temperature sensor is provided on the water inlet pipeline, and a water return temperature sensor is provided on the water return pipeline;

[0029] The controller is electrically connected to the water inlet temperature sensor and the water return temperature sensor respectively.

[0030] Further, the heat exchanger is a finned tube heat exchanger.

[0031] Further, the chilled water is an ethanol solution.

[0032] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0033] 1. Through the air ducts formed on both sides of the spray cooling mechanism of the present utility model, the heat dissipation exhaust fan is used to introduce air through the spray cooling mechanism into the dry cooling part, and heat exchange is carried out with the heat exchanger in the dry cooling part, effectively realizing the cooling of chilled water by using natural wind;

[0034] 2. By arranging the wet cooling coil in the wet cooling part of the present utility model, the wet cooling coil is cooled by the spray device in the wet cooling part. The wet cooling coil and the heat exchanger can be connected in series, in parallel or separately to the cold water circulation loop corresponding to different operating modes through the water inlet pipeline, the water return pipeline, the intermediate branch and the corresponding valves, with a simple structure and the ability to realize the switching of multiple operating modes, reducing the production and maintenance costs;

[0035] 3. The spray water sprayed by the spray device of the present utility model passes through the wet cooling coil, which can cool the chilled water in the wet cooling coil. Then, the spray water further exchanges heat with the refrigerant in the mechanical coil, effectively utilizing the spray water and thus improving the energy efficiency of the cooling system; at the same time, after the spray water exchanges heat with the mechanical coil or the wet cooling coil, it enters the spray cooling mechanism to exchange heat with the air passing through the spray cooling mechanism, realizing the cooling of the spray water by using natural wind resources. The air after heat exchange can further enter the dry cooling part to exchange heat with the heat exchanger, further improving the energy efficiency of the cooling system by using natural cold resources;

[0036] 4. By arranging an air inlet at the top of the wet cooling part of the present utility model and connecting one side above the spray cooling mechanism to the dry cooling part, the wet cooling coil and the mechanical coil can be cooled by a combination of wet cooling and air cooling, further improving the energy efficiency of the cooling system by using natural cold resources; BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural diagram of the present utility model.

[0038] Reference numerals in the drawings: dry-cooling section 100, wet-cooling section 200, mechanical refrigeration section 300, heat exchanger 110, exhaust fan 120, spraying device 210, wet-cooling coil 220, mechanical coil 230, spraying cooling mechanism 240, spraying pipeline 211, spraying water pump 212, end of air curtain 310, compressor 320, evaporator 330, return water pipeline 410, water supply pipeline 420, dry return water branch 411, wet return water branch 412, return water temperature sensor 413, chilled water pump 414, intermediate branch 415, second mechanical water supply branch 416, dry water supply branch 421, wet water supply branch 422, water supply temperature sensor 423, first mechanical water supply branch 424, mechanical return water branch 425, first valve 510, second valve 520, third valve 530, fourth valve 540, fifth valve 550, sixth valve 560, seventh valve 570. Detailed implementation manners

[0039] The attached drawings of the present utility model are only for illustrative purposes and cannot be construed as a limitation to the present utility model. For better illustrating the following embodiments, some components in the drawings are omitted, enlarged or reduced, which do not represent the dimensions of the actual products; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0040] Embodiment 1

[0041] As Figure 1 shown, this embodiment provides a cooling system based on natural cold resources. The cooling system includes a dry-cooling section 100, a wet-cooling section 200 and a mechanical refrigeration section 300; preferably, in this embodiment, the dry-cooling section 100, the wet-cooling section 200 and the mechanical refrigeration section 300 can be arranged side by side in sequence, reducing the pipeline arrangement and space occupation;

[0042] The dry-cooling section 100 is provided with a heat exchanger 110. Preferably, the heat exchanger 110 can be set as a finned-tube heat exchanger, and the finned-tube heat exchanger can increase the contact area with air and improve the heat exchange efficiency; the wet-cooling section 200 is respectively provided with a spraying device 210, a wet-cooling coil 220, a spraying cooling mechanism 240 and a water receiving tray (not shown in the figure) from top to bottom; the mechanical refrigeration section 300 includes an end of air curtain 310; the end of air curtain 310 is used for cooling the indoor environment. Specifically, the cooling system in this embodiment can be applied to the refrigeration of a data center computer room. Then, in this embodiment, the end of air curtain 310 can be used for cooling the data center computer room;

[0043] Among them, the end 310 of the air wall is connected to the heat exchanger 110 and the wet cooling coil 220 through a return water pipeline 410 and a feed water pipeline 420 to form a chilled water circulation loop. Specifically, the return water pipeline 410 is connected to the water inlets of the heat exchanger 110 and the wet cooling coil 220 through a dry return water branch 411 and a wet return water branch 412 respectively, and the feed water pipeline 420 is connected to the water outlets of the heat exchanger 110 and the wet cooling coil 220 through a dry feed water branch 421 and a wet feed water branch 422 respectively; a chilled water pump 414 is arranged on the return water pipeline 410; a feed water temperature sensor 423 is arranged on the feed water pipeline 420, and a return water temperature sensor 413 is arranged on the return water pipeline 410. By detecting the feed water temperature and the return water temperature of the end 310 of the air wall, the operating power of each device of the cooling system can be correspondingly adjusted to improve the energy efficiency of the cooling system. The chilled water can be set as an ethanol solution.

[0044] The spraying device 210 is connected to the water receiving tray through a spraying pipeline 211 provided with a spraying water pump 212; specifically, the spraying device 210 includes evenly arranged nozzles, and cooling spraying water is sprayed downward from the top of the wet cooling part 200 through the nozzles. The spraying water passes through the wet cooling coil 220 and takes away the heat of the chilled water in the wet cooling coil 220; after passing through the wet cooling coil 220, the spraying water further enters the spraying cooling mechanism 240 downward. Preferably, the spraying cooling mechanism 240 can be set as PVC (Polyvinyl chloride) packing. The spraying cooling mechanism 240 is arranged in a porous structure in the vertical direction, which can enable the spraying water to form a thin water film in the spraying cooling mechanism 240. In the horizontal direction, there are a number of air ducts penetrating both sides of the spraying cooling mechanism 240. The water film formed by the spraying water in the spraying cooling mechanism 240 exchanges heat with the air in the air ducts, and some water molecules in the water film evaporate to take away the heat of the spraying water, realizing the cooling of the spraying water; the cooled spraying water finally falls into the water receiving tray.

[0045] Further, an air outlet is provided at the top of the dry cooling part 100, and an exhaust fan 120 is provided at the air outlet. The bottom of the dry cooling part 100 is communicated with one side of the air duct of the spray cooling mechanism 240, so that the dry cooling part 100 and the spray water mechanism of the wet cooling part 200 form a first heat dissipation air duct; since there is an air duct penetrating both sides in the spray cooling mechanism 240, powered by the exhaust fan 120, the exhaust air can enter the dry cooling part 100 through the spray cooling mechanism 240 and directly exchange heat with the heat exchanger 110. If the spray device 210 operates at this time, the exhaust air can first exchange heat with the spray water and then enter the dry cooling part 100 to further exchange heat with the heat exchanger 110, which can make full use of natural wind resources and improve the energy efficiency of the cooling system.

[0046] A mechanical refrigeration system is also provided in the cooling system. The mechanical refrigeration system includes a mechanical coil 230, a compressor 320, an evaporator 330, and a throttle valve (not shown in the figure); wherein, the mechanical coil 230 is arranged in the wet cooling part 200. Specifically, the mechanical coil 230 is arranged between the wet cooling coil 220 and the spray cooling mechanism 240. The compressor 320, the evaporator 330, and the throttle valve are arranged in the mechanical refrigeration part 300. The mechanical coil 230, the compressor 320, the evaporator 330, and the throttle valve are connected through a refrigerant pipeline to form a refrigerant circulation loop; after the spray water exchanges heat with the wet cooling coil 220, it passes downward through the mechanical coil 230 and can further exchange heat with the refrigerant in the mechanical coil 230, effectively using the cold quantity of the spray water to realize multi-stage cooling of the wet cooling coil 220 and the mechanical coil 230, which is beneficial to improving the energy efficiency of the cooling system; preferably, the evaporator can be set as a plate evaporator.

[0047] The mechanical refrigeration system is set to be able to further reduce the temperature of the chilled water in the chilled water circulation loop, increase the refrigerating capacity provided by the cooling system, and meet the operation load requirements of the room; therefore, the evaporator 330 is connected to the water supply pipeline 420 through a first mechanical water inlet branch 424 and a mechanical water return branch 425, and the evaporator 330 is connected to the water return pipeline 410 through a second mechanical water inlet branch 416 to introduce the chilled water into the evaporator 330 to exchange heat with the refrigerant; the chilled water pump 414 is arranged between the second mechanical water inlet branch 416 and the water outlet of the air wall end 310, which can better provide power for the circulation of the chilled water and introduce the chilled water into the evaporator 330;

[0048] In addition, an air inlet is provided at the top of the wet cooling part 200, and one side of the upper region of the spray cooling mechanism 240 of the wet cooling part 200, that is, one side of the region where the mechanical coil 230 is located, is communicated with the dry cooling part 100 to form a second heat dissipation air duct between the wet cooling part 200 and the dry cooling part 100. Through the second heat dissipation air duct, fresh outdoor air can be introduced into the wet cooling part 200, and the spray water is used to cool the wet cooling coil 220 and the mechanical coil 230. After being cooled in the wet area, the air further enters the dry cooling part 100 to cool the heat exchanger 110, making full use of natural cold resources and greatly improving the energy efficiency of the cooling system.

[0049] In order to better utilize natural cold resources and match the specific outdoor working conditions to achieve indoor refrigeration accordingly, corresponding valves are provided on each pipeline of the cooling system, and a controller is provided to perform corresponding control on the cooling system. Specifically:

[0050] A first valve 510 is provided on the dry return water branch 411, a second valve 520 is provided on the wet return water branch 412, a third valve 530 is provided on the dry water inlet branch 421. The water outlet of the heat exchanger 110 is connected to the water inlet of the wet cooling coil 220 through an intermediate branch 415. One end of the intermediate branch 415 is connected to the dry water inlet branch 421 between the water outlet of the heat exchanger 110 and the third valve 530, and the other end is connected to the wet return water branch 412 between the water inlet of the wet cooling coil 220 and the second valve 520. A fourth valve 540 is provided on the intermediate branch 415. A fifth valve 550 is provided on the first mechanical water inlet branch 424, a sixth valve 560 is provided on the second mechanical water inlet branch 416, and a seventh valve 570 is provided between the connection end of the first mechanical water inlet branch 424 and the mechanical return water branch 425 on the water inlet pipeline 420.

[0051] The cooling system is also provided with a controller (not shown in the figure), which is electrically connected to each valve and the spray device 210, the wind wall terminal 310, the spray water pump 212, the chilled water pump 414, the exhaust fan 120, the compressor 320, the inlet water temperature sensor 423 and the return water temperature sensor 413, and the cooling system also includes an outdoor wet-bulb temperature sensor and an outdoor dry-bulb temperature sensor, which are used to detect the outdoor wet-bulb temperature and dry-bulb temperature, respectively, and the outdoor wet-bulb temperature sensor and the outdoor dry-bulb temperature sensor are electrically connected to the controller. The controller acquires the standard operation mode pre-stored in the controller by collecting the outdoor wet-bulb temperature and the outdoor dry-bulb temperature collected by the outdoor wet-bulb temperature sensor and the outdoor dry-bulb temperature sensor, and the temperature of the chilled water entering and leaving the wind wall terminal collected by the inlet water temperature sensor 423 and the return water temperature sensor 413;

[0052] The standard operation modes include at least a dry cooling mode, a dry cooling coupling mode, a hybrid cooling mode and a mechanical cooling mode. Other standard operation modes may be added according to specific application scenarios. In this embodiment, the dry cooling mode, the dry cooling coupling mode, the hybrid cooling mode and the mechanical cooling mode are mainly described. Other standard operation modes and corresponding control methods are similar to these four modes. Specifically:

[0053] When the outdoor dry-bulb temperature is ≤ the first preset temperature, the cooling system runs the dry cooling mode; in the dry cooling mode, the fifth valve 550, the sixth valve 560, the second valve 520 and the fourth valve 540 in the cooling system are closed, the first valve 510, the third valve 530 and the seventh valve 570 are opened, and the exhaust fan 120, the wind wall terminal 310 and the chilled water pump 414 are turned on; since the outdoor temperature is relatively low at this time, the chilled water flowing out of the wind wall terminal 310 enters the heat exchanger 110 through the return water pipe 410 and the dry return water branch 411, and is powered by the heat dissipation exhaust fan so that the exhaust air takes away the heat of the chilled water in the heat exchanger 110, and then the chilled water returns to the wind wall terminal 310 through the dry inlet branch 421 and the inlet pipe 420 to cool the room.

[0054] When the outdoor dry-bulb temperature > the first preset temperature and the outdoor wet-bulb temperature ≤ the second preset temperature, the cooling system operates in the dry-cooling coupling mode; wherein, the second preset temperature is greater than the first preset temperature; in the dry-cooling coupling mode, the fifth valve 550, the sixth valve 560, the second valve 520 and the third valve 530 are closed, the first valve 510, the fourth valve 540 and the seventh valve 570 are opened, and the exhaust fan 120, the air-wall end 310, the chilled water pump 414 and the spraying device 210 are opened; at this time, the spraying device 210 is opened, and the chilled water flowing out from the air-wall end 310 will first enter the heat exchanger 110 through the return water pipeline 410 and the dry return water branch 411, perform the first heat exchange with the exhaust air in the heat exchanger 110, then pass through the dry water inlet branch 421, the intermediate branch 415 and the wet return water branch 412 to enter the wet cooling coil 220, perform heat exchange with the spraying water and the fresh air entering the wet cooling part 200 through the second heat dissipation air duct, and then return to the air-wall end 310 through the wet water inlet branch 422 and the water inlet pipeline 420; at the same time, the spraying water enters the spraying cooling mechanism 240 for cooling after heat exchange with the wet cooling coil 220, and the cooled spraying water finally returns to the water receiving tray and realizes circulation through the spraying water pump 212 and the spraying water pipe.

[0055] When the outdoor wet-bulb temperature is ≥ the second preset temperature and the outdoor wet-bulb temperature is ≤ the third preset temperature, the cooling system operates the mixed cooling mode; wherein the third preset temperature is greater than the second preset temperature; in the mixed cooling mode, the seventh valve 570, the sixth valve 560, the first valve 510, the fourth valve 540 and the third valve 530 are closed, the second valve 520 and the fifth valve 550 are opened, and the exhaust fan 120, the wind wall terminal 310, the chilled water pump 414, the spray device 210 and the compressor 320 are opened; at this time, due to the high outdoor temperature, the pure natural cold resource cannot meet the indoor operating load, and additional mechanical refrigeration is required for further cooling. The chilled water flowing out of the wind wall cooling system does not pass through the heat exchanger 110, but directly enters the wet cooling coil 220 for heat exchange. The spray water can first exchange heat with the fresh air of the second heat dissipation duct, and then exchange heat with the wet cooling coil 220. After the chilled water is cooled in the wet cooling coil 220, it enters the water inlet pipe 420. The temperature of the chilled water is detected by the water inlet temperature sensor 423 on the water inlet pipe 420. If the temperature of the chilled water exceeds a certain threshold, the seventh valve 570 is closed, and the chilled water enters the evaporator 330 through the first mechanical water inlet branch 424, exchanges heat with the refrigerant in the evaporator 330, and then returns to the wind wall end 310 through the mechanical return water branch 425. After the refrigerant in the evaporator 330 exchanges heat with the chilled water, it enters the mechanical coil 230 of the wet cooling part 200 and exchanges heat with the spray water. After the spray water exchanges heat with the wet cooling coil 220, the temperature will increase by 2-3°C, but under the current outdoor working conditions, it is still lower than the temperature of the refrigerant after passing through the evaporator 330. The spray water can take away the heat of the refrigerant through heat exchange, thereby cooling the refrigerant.

[0056] When the outdoor wet-bulb temperature is ≥ the third preset temperature, the natural cooling system operates the mechanical refrigeration mode; in the mechanical refrigeration mode, the seventh valve 570, the fifth valve 550, the first valve 510, the second valve 520, the fourth valve 540 and the third valve 530 are closed, the sixth valve 560 is opened, and the exhaust fan 120, the wind wall terminal 310, the chilled water pump 414, the spray device 210 and the compressor 320 are turned on. At this time, since the outdoor temperature is too high, it is impossible to achieve multi-stage cooling through the spray water. At this time, it is equivalent to only turning on the mechanical refrigeration system, and the chilled water flowing out of the wind wall terminal 310 directly enters the evaporator 330 through the second mechanical water inlet branch 416 to exchange heat with the refrigerant, and then returns to the wind wall terminal 310 through the mechanical water return branch 425 after the heat exchange, and the refrigerant after the heat exchange enters the mechanical coil 230 to exchange heat with the spray water.

[0057] Among them, the first preset temperature, the second preset temperature, and the third preset temperature can be specifically set according to the environmental conditions set by the natural cooling system and the indoor operation load.

[0058] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly illustrating the technical solutions of the present invention, rather than limitations on the specific implementation manners of the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the claims of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. A cooling system based on natural cooling resources, characterized in that: The cooling system includes a dry cooling part, a wet cooling part and a mechanical refrigeration part; The dry cooling part is provided with a heat exchanger; The wet cooling part is provided with a spray device, a wet cooling coil, a spray cooling mechanism and a water receiving tray from top to bottom; The mechanical refrigeration unit is provided with a wind wall terminal; the wind wall terminal is used to cool down the room; The spray device is connected to the water receiving pan via a spray pipeline provided with a spray water pump; The top of the dry cooling part is provided with an exhaust port, an exhaust fan is provided at the exhaust port, the spray cooling mechanism is provided with an air duct that passes through both sides of the spray cooling mechanism, and the bottom of the dry cooling part is connected to one side of the air duct of the spray cooling mechanism; The end of the wind wall is connected to the heat exchanger and the wet cooling coil through a return water pipeline and a water inlet pipeline to form a cold water circulation loop, wherein the return water pipeline is connected to the water inlet of the heat exchanger and the wet cooling coil through a dry return water branch and a wet return water branch, and the water inlet pipeline is connected to the water outlet of the heat exchanger and the wet cooling coil through a dry inlet water branch and a wet inlet water branch; a chilled water pump is arranged on the return water pipeline; The dry water return branch is provided with a first valve, the wet water return branch is provided with a second valve, the dry water inlet branch is provided with a third valve, the water outlet of the heat exchanger is connected to the water inlet of the wet cooling coil through an intermediate branch, one end of the intermediate branch is connected to the dry water inlet branch between the water outlet of the heat exchanger and the third valve, and the other end is connected to the wet water return branch between the water inlet of the wet cooling coil and the second valve, and the intermediate branch is provided with a fourth valve; The cooling system is also provided with a controller, and the controller is electrically connected to each valve and the spray device, the wind wall terminal, the spray water pump, the freezing water pump, and the exhaust fan.

2. A cooling system based on natural cooling resources according to claim 1, characterized in that: The wet cooling part is also provided with a mechanical coil, and the mechanical coil is arranged between the wet cooling coil and the spray cooling mechanism; The mechanical refrigeration unit is also provided with a compressor, an evaporator and a throttle valve; the controller is electrically connected to the compressor; The compressor, mechanical coil, evaporator and throttle valve are connected through a refrigerant pipeline to form a refrigerant circulation loop; The evaporator is connected to the water inlet pipeline through a first mechanical water inlet branch and a mechanical water return branch, and the evaporator is connected to the water return pipeline through a second mechanical water inlet branch, and the chilled water is introduced into the evaporator for heat exchange with the refrigerant; the chilled water pump is arranged between the second mechanical water inlet branch and the water outlet at the end of the wind wall; A fifth valve is provided on the first mechanical water inlet branch, a sixth valve is provided on the second mechanical water inlet branch, and a seventh valve is provided between the connecting end of the first mechanical water inlet branch and the mechanical return water branch on the water inlet pipeline.

3. A cooling system based on natural cooling resources according to claim 2, characterized in that: An air inlet is provided at the top of the wet and cold part; One side of the upper region of the spray cooling mechanism of the wet cooling part is communicated with the dry cooling part.

4. A cooling system based on natural cooling resources according to claim 2, characterized in that: The evaporator is a plate type evaporator.

5. The cooling system based on natural cooling resources according to claim 1, characterized in that: The spray cooling mechanism is made of PVC filler and is arranged as a porous structure in the horizontal direction. A plurality of air ducts penetrating through the two sides of the spray cooling mechanism are arranged in the horizontal direction.

6. A cooling system based on natural cooling resources according to any one of claims 1 to 5, characterized in that: The cooling system also includes an outdoor wet-bulb temperature sensor and an outdoor dry-bulb temperature sensor, which are used to detect the outdoor wet-bulb temperature and dry-bulb temperature respectively; The outdoor wet-bulb temperature sensor and the outdoor dry-bulb temperature sensor are electrically connected to the controller respectively.

7. A cooling system based on natural cooling resources according to any one of claims 1 to 5, characterized in that: The water inlet pipe is provided with a water inlet temperature sensor, and the water return pipe is provided with a water return temperature sensor; The controller is electrically connected to the water inlet temperature sensor and the water return temperature sensor respectively.

8. A cooling system based on natural cooling resources according to any one of claims 1 to 5, characterized in that: The heat exchanger is a tube-fin heat exchanger.

9. A cooling system based on natural cooling resources according to any one of claims 1 to 5, characterized in that: The frozen water is an ethanol solution.

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