A natural cooling system and control method

Abstract

The application provides a natural cooling system and a control method, the natural cooling system comprising a dry cooling area, a wet cooling area and a mechanical refrigeration area, the dry cooling area comprising a dry cooling heat exchanger; the wet cooling area being provided from top to bottom with a spraying mechanism, a wet water coil, a spraying water cooling mechanism and a water receiving and storage tray; the mechanical refrigeration area comprising a wind wall cooling mechanism; the spraying mechanism being connected with a spraying water pump and the water receiving and storage tray to form a loop; compared with the prior art, the application forms a heat dissipation air duct through the dry cooling area and the spraying water cooling mechanism, effectively utilizes natural cold resources to realize heat exchange of the spraying water and the dry cooling heat exchanger; the wind wall cooling mechanism is connected with the dry cooling heat exchanger and the wet water coil to form a cold water circulation loop, and the dry cooling heat exchanger and the wet water coil are connected through corresponding valves and pipelines to realize series connection, parallel connection or separate access in the cold water circulation loop in different operation modes, so that the structure is simple, the natural cold resources can be well utilized to realize operation in different working conditions, and the energy efficiency of the natural cooling system is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air conditioning cooling control, and more particularly, to a natural cooling system and a control method. BACKGROUND

[0002] The existing water chiller unit generally has the defects of large heat generation and high heat generation density, resulting in high energy consumption of the water chiller unit and the cooling system composed of the water chiller unit and other units, which cannot meet the requirements of green energy. At the same time, there are DPC liquid cooling systems, heat pipe cooling and indirect evaporative cooling AHU in the prior art, which can reasonably utilize natural cold source to assist heat exchange in the transition season, and can reduce energy consumption to a certain extent. However, the structure of such system is complex, the production and maintenance cost is high, and the natural cold source cannot be utilized to the maximum extent. SUMMARY

[0003] The present application aims to overcome at least one of the above-mentioned defects of the prior art, and provides a natural cooling system and a control method, which can effectively utilize natural cold source to realize cooling, reduce the energy consumption of the cooling system, and has a simple structure, thereby reducing the production and maintenance cost.

[0004] The technical scheme adopted by the present application is as follows:

[0005] The present application provides a natural cooling system, which comprises a dry cooling area, a wet cooling area and a mechanical refrigeration area arranged in sequence.

[0006] The dry cooling area is provided with a dry cooling heat exchanger.

[0007] The wet cooling area is provided with a spraying mechanism, a wet water coil, a spraying water cooling mechanism and a water receiving and storage tray from top to bottom.

[0008] The mechanical refrigeration area is provided with a wind wall cooling mechanism, which is used for cooling the indoor.

[0009] The spraying mechanism is connected with the water receiving and storage tray through a spraying pipeline provided with a spraying water pump.

[0010] The top of the dry cooling area is provided with an exhaust outlet, and a heat dissipation exhaust fan is arranged at the exhaust outlet. The spraying water cooling mechanism is provided with an air duct penetrating through both sides of the spraying water cooling mechanism, and the bottom of the dry cooling area is in communication with one side of the air duct of the spraying water cooling mechanism.

[0011] The wind wall cooling mechanism is connected with the dry cooling heat exchanger and the wet water coil through a return water pipeline and an inlet water pipeline to form a cold water circulation loop, wherein the return water pipeline is connected with the water inlets of the dry cooling heat exchanger and the wet water coil through a dry return water branch and a wet return water branch respectively, and the inlet water pipeline is connected with the water outlets of the dry cooling heat exchanger and the wet water coil through a dry inlet water branch and a wet inlet 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 inlet water branch, the water outlet of the dry cooling heat exchanger is connected with the water inlet of the wet water coil through an intermediate branch, one end of the intermediate branch is connected with the dry inlet water branch between the water outlet of the dry cooling heat exchanger and the third valve, the other end of the intermediate branch is connected with the wet return water branch between the water inlet of the wet water coil and the second valve, and a fourth valve is arranged on the intermediate branch. Through the air ducts formed on both sides of the spray water cooling mechanism, air is introduced into the dry cooling area by the dry cooling area under the power of the heat dissipation exhaust fan, and heat exchange is performed between the dry cooling area and the dry cooling heat exchanger, so that the chilled water is effectively cooled by using natural wind; at the same time, if the cooling demand is not met, the spray mechanism can be started to further cool the chilled water in the wet water coil, and then the spray water falls into the spray water cooling mechanism to exchange heat with the air passing through the spray water cooling mechanism on both sides, so that the spray water is cooled, and the cooled spray water falls into the water collecting tray to realize the circulation of the spray water. In addition, through the combination of specific pipelines and valves, the dry cooling heat exchanger and the wet water coil are connected in series, in parallel or in a single pipeline, various cooling modes are switched, the structure is simple, and the chilled water can be effectively cooled by using natural cooling resources. In the case of reducing the energy consumption of the natural cooling system, the production and maintenance costs are also reduced.

[0013] Further, the wet cooling area is further provided with a mechanical coil pipe, and the mechanical coil pipe is arranged between the wet water coil and the spray water cooling mechanism.

[0014] The mechanical refrigeration area is further provided with a compressor, an evaporator and a throttling valve.

[0015] The compressor, the mechanical coil pipe, the evaporator and the throttling valve are connected through a refrigerant pipeline to form a refrigerant circulation loop.

[0016] The evaporator is connected with the water inlet pipeline through a first mechanical water inlet branch and a mechanical water return branch, and is connected with the water return pipeline through a second mechanical water inlet branch, and the chilled water is introduced into the evaporator to exchange heat with refrigerant; the chilled water pump is arranged between the second mechanical water inlet branch and the water outlet of the air wall cooling mechanism.

[0017] 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 first mechanical water inlet branch and the mechanical water return branch connection end on the water inlet pipeline.

[0018] The natural cooling system further comprises a mechanical refrigeration system, wherein a mechanical coil of the mechanical refrigeration system is arranged in the wet cooling area, and the mechanical coil is arranged below the wet water coil; after the spray water exchanges heat with the wet water coil, the spray water falls into the area where the mechanical coil is arranged, so that the spray water can further exchange heat with the refrigerant in the mechanical coil, thereby reducing the energy consumption of the natural cooling system; and the heat-exchanged refrigerant can exchange heat with the chilled water in the chilled water circulation loop through the evaporator, thereby improving the refrigeration efficiency of the natural cooling system.

[0019] Further, an air inlet is formed at the top end of the wet cooling area.

[0020] One side of the upper area of the spray water cooling mechanism of the wet cooling area is communicated with the dry cooling area.

[0021] By forming the air inlet at the top end of the wet cooling area and communicating one side of the upper area of the spray water cooling mechanism with the dry cooling area, under the action of the heat dissipation and exhaust fan of the dry cooling area, outdoor fresh air can be introduced into the wet cooling area through the air inlet, and exchanges heat with the wet water coil and the mechanical coil of the wet cooling area, thereby further utilizing natural cooling resources and improving the energy efficiency of the natural cooling system.

[0022] Further, a water inlet temperature sensor is arranged on the water inlet pipeline, and a water return temperature sensor is arranged on the water return pipeline; by detecting the water inlet temperature and the water return temperature of the air wall cooling mechanism, the operating power of each device of the natural cooling system can be adjusted correspondingly, thereby improving the energy efficiency of the natural cooling system.

[0023] Another aspect of the present application provides a natural cooling control method, wherein the method uses the natural cooling system described above, and the method comprises the following steps:

[0024] An outdoor working condition is obtained, a corresponding preset standard operating mode is obtained according to the outdoor working condition, and the operating state of the natural cooling system is set according to the obtained standard operating mode;

[0025] acquire an indoor operation load, and set operation parameters of the natural cooling system according to the indoor operation load and preset operation strategies in the standard operation mode currently running;

[0026] adjust the operation parameters of the natural cooling system according to the indoor operation load and preset optimization adjustment strategies in the standard operation mode currently running;

[0027] acquire a preferred operation strategy in which the natural cooling system has the optimal energy efficiency in the adjustment process, and update the operation strategy of the standard operation mode corresponding to the outdoor working condition and the indoor operation load according to the preferred operation state.

[0028] According to the outdoor working condition, the corresponding preset standard operation mode and the operation strategy in the standard operation mode that meets the current indoor operation load are acquired, the natural cooling system can adjust each device in the natural cooling system through the preset optimization adjustment strategy in the standard operation mode during the operation of the operation strategy of the standard operation mode, so that the natural cooling system can have the optimal energy efficiency while meeting the indoor operation load, and the optimal energy efficiency state is updated as the operation strategy of the standard operation mode, so that when the same outdoor working condition and indoor operation load occur again, the selected standard operation mode and the corresponding operation strategy can make the natural cooling system run in the optimal energy efficiency state; through the preset standard operation mode and the continuous optimization iteration during operation, the natural cooling system can always run in the optimal energy efficiency, thereby reducing the energy consumption of the natural cooling system.

[0029] Further, the standard operation mode at least includes a dry cooling mode, a dry cooling coupling mode, a hybrid refrigeration mode and a mechanical refrigeration mode.

[0030] The corresponding preset standard operation mode is acquired according to the outdoor working condition, and the operation state of the natural cooling system is set according to the acquired standard operation mode, which specifically includes:

[0031] When the outdoor dry bulb temperature is less than or equal to a first preset temperature, the natural cooling system runs in the dry cooling mode; in the dry cooling mode, the fifth valve, the sixth valve, the second valve and the fourth valve in the natural cooling system are closed, the first valve, the third valve and the seventh valve are opened, and the heat dissipation exhaust fan, the wind wall cooling mechanism and the chilled water pump are opened.

[0032] when the outdoor dry-bulb temperature is greater than the first preset temperature and the outdoor wet-bulb temperature is less than or equal to the second preset temperature, the natural cooling system runs in the dry-cold coupling mode; in the dry-cold coupling mode, the fifth valve, the sixth valve, the second valve and the third valve are closed, the first valve, the fourth valve and the seventh valve are opened, and the heat dissipation exhaust fan, the wind wall cooling mechanism, the chilled water pump and the spraying mechanism are opened; wherein the second preset temperature is greater than the first preset temperature;

[0033] when the outdoor wet-bulb temperature is greater than or equal to the second preset temperature and less than or equal to the third preset temperature, the natural cooling system runs in the mixed refrigeration mode; in the mixed refrigeration mode, the seventh valve, the sixth valve, the first valve, the fourth valve and the third valve are closed, the second valve and the fifth valve are opened, and the heat dissipation exhaust fan, the wind wall cooling mechanism, the chilled water pump, the spraying mechanism and the compressor are opened; wherein the third preset temperature is greater than the second preset temperature

[0034] when the outdoor wet-bulb temperature is greater than or equal to the third preset temperature, the natural cooling system runs in the mechanical refrigeration mode; in the mechanical refrigeration mode, the seventh valve, the fifth valve, the first valve, the second valve, the fourth valve and the third valve are closed, the sixth valve is opened, and the heat dissipation exhaust fan, the wind wall cooling mechanism, the chilled water pump, the spraying mechanism and the compressor are opened.

[0035] Further, the setting of the operation parameters of the natural cooling system according to the indoor operation load and the preset operation strategy in the standard operation mode currently running specifically includes:

[0036] obtaining the refrigeration capacity required to be provided by the natural cooling system according to the indoor operation load;

[0037] obtaining the operation strategy in the standard operation mode according to the refrigeration capacity; the operation strategy includes the power of the wind wall cooling mechanism, the chilled water pump, the heat dissipation exhaust fan, the spraying water pump and the compressor in the natural cooling system;

[0038] setting the power of the wind wall cooling mechanism, the chilled water pump, the heat dissipation exhaust fan, the spraying water pump and the compressor respectively according to the operation strategy.

[0039] Further, the adjustment of the operation parameters of the natural cooling system according to the indoor operation load and the preset optimal adjustment strategy in the standard operation mode currently running specifically includes:

[0040] ensuring that the refrigeration capacity of the natural cooling system can meet the indoor operation load, and running the preset optimal adjustment strategy in the standard operation mode;

[0041] The preset optimization adjustment strategy in the standard operation mode is specifically:

[0042] In the dry cooling mode and the mechanical refrigeration mode, when the flow rate of the chilled water does not exceed a preset flow rate threshold, gradually increase the power of the chilled water pump and decrease the power of the air wall cooling mechanism; when the flow rate of the chilled water exceeds the preset flow rate threshold, gradually increase the power of the air wall cooling mechanism and the heat dissipation exhaust fan;

[0043] In the dry cooling coupling mode and the hybrid refrigeration mode, when the temperature difference between the inlet and outlet of the chilled water of the air wall cooling mechanism does not exceed a preset temperature difference threshold, gradually decrease the power of the chilled water pump and increase the power of the air wall cooling mechanism.

[0044] By setting different optimization adjustment strategies for different standard operation modes, the operation of each device of the natural cooling system in different standard operation modes can be better matched, and corresponding adjustment can be performed.

[0045] Further, the energy efficiency of the natural cooling system is the ratio of the refrigeration capacity of the natural cooling system to the total energy consumption of the natural cooling system.

[0046] The total energy consumption of the natural cooling system is the sum of the powers of the air wall cooling mechanism, the chilled water pump, the heat dissipation exhaust fan, the spray water pump and the compressor.

[0047] Further, the preferred operation strategy in which the energy efficiency of the natural cooling system is optimal in the adjustment process is obtained, and the operation strategy of the standard operation mode corresponding to the outdoor working condition and the indoor operation load is updated according to the preferred operation state, and the preferred operation strategy specifically includes:

[0048] The powers of the air wall cooling mechanism, the chilled water pump, the heat dissipation exhaust fan, the spray water pump and the compressor when the energy consumption is lowest in the adjustment process of the optimization adjustment strategy of the standard operation mode are obtained;

[0049] The powers of the air wall cooling mechanism, the chilled water pump, the heat dissipation exhaust fan, the spray water pump and the compressor when the energy consumption is lowest are recorded as the preferred operation strategy;

[0050] The powers of the air wall cooling mechanism, the chilled water pump, the heat dissipation exhaust fan, the spray water pump and the compressor corresponding to the operation strategy in the standard operation mode under the outdoor working condition and the indoor operation load are updated according to the preferred operation strategy.

[0051] Compared with the prior art, the present application has the following beneficial effects:

[0052] 1. In the system structure: the application utilizes the air ducts formed on both sides of the spray water cooling mechanism, and the heat exchange between the dry cooling heat exchanger in the dry cooling area and the air introduced into the dry cooling area by the heat dissipation fan, to effectively realize the cooling of chilled water by using natural wind.

[0053] 2. The application sets the wet water coil in the wet cooling area, which is cooled by the spray mechanism in the wet cooling area, and the wet water coil and the dry cooling heat exchanger are connected by the water inlet pipeline, water return pipeline and intermediate branch, as well as corresponding valves, so that the wet water coil and the dry cooling heat exchanger can be connected in series, parallel or individually in the cold water circulation circuit in different operation modes, the structure is simple, and the switching of multiple operation modes can be realized, thereby reducing the production and maintenance costs.

[0054] 3. The spray water sprayed by the spray mechanism passes through the wet water coil, so that the chilled water in the wet water coil can be cooled, and then the spray water further exchanges heat with the refrigerant in the mechanical coil, so that the spray water can be effectively utilized, and the energy efficiency of the natural cooling system is improved. At the same time, after the spray water exchanges heat with the mechanical coil or the wet water coil, it enters the spray water cooling mechanism to exchange heat with the air passing through the spray water cooling mechanism, so that the spray water is cooled by using natural wind resources, and the air after heat exchange can further exchange heat with the dry cooling heat exchanger in the dry cooling area, so that the energy efficiency of the natural cooling system is further improved.

[0055] 4. The application sets the air inlet on the top of the wet cooling area, and the upper side of the spray water cooling mechanism is communicated with the dry cooling area, so that the wet water coil and the mechanical coil can be cooled by combining wet cooling and air cooling, and the energy efficiency of the natural cooling system is further improved by using natural cooling resources.

[0056] 5. In the method aspect: the application presets corresponding standard operation modes for each outdoor working condition, and adjusts each device in the natural cooling system by the preset optimization adjustment strategy in the standard operation mode during the operation of each standard operation mode of the natural cooling system, so that the energy efficiency of the natural cooling system is optimal, thereby reducing the energy consumption of the natural cooling system. At the same time, the state of optimal energy efficiency is updated and iterated to the operation strategy of the standard operation mode, so that the natural cooling system can always operate at the optimal energy efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0057] Figure 1 The structural diagram of the application.

[0058] Figure 2This is a flowchart of the steps of the present invention.

[0059] Attached diagram labels: Dry cooling zone 100, wet cooling zone 200, mechanical refrigeration zone 300, dry cooling heat exchanger 110, heat dissipation exhaust fan 120, spray mechanism 210, wet water coil 220, mechanical coil 230, spray water cooling mechanism 240, spray piping 211, spray water pump 212, air wall cooling mechanism 310, compressor 320, evaporator 330, return water pipe 410, inlet water pipe 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 inlet branch 416, dry water inlet branch 421, wet water inlet branch 422, water inlet temperature sensor 423, first mechanical water inlet 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

[0060] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the invention. To better illustrate the following embodiments, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions; it is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0061] Example 1

[0062] like Figure 1 As shown, this embodiment provides a natural cooling system, which includes a dry cooling zone 100, a wet cooling zone 200, and a mechanical cooling zone 300 arranged sequentially. Preferably, in this embodiment, the dry cooling zone 100, the wet cooling zone 200, and the mechanical cooling zone 300 can be arranged side by side in sequence to reduce the installation of pipelines and the space occupied.

[0063] The dry cooling zone 100 is equipped with a dry cooling heat exchanger 110. Preferably, the dry cooling heat exchanger 110 can be a tube-fin dry cooling heat exchanger, which can increase the contact area with air and improve heat exchange efficiency. The wet cooling zone 200 is equipped with a spray mechanism 210, a wet water coil 220, a spray water cooling mechanism 240, and a water collection and storage pan (not shown in the figure) from top to bottom. The mechanical refrigeration zone 300 is equipped with a wind wall cooling mechanism 310. The wind wall cooling mechanism 310 is used to cool the room. Specifically, the natural cooling system in this embodiment can be applied to the cooling of a data center computer room. Therefore, in this embodiment, the wind wall cooling mechanism 310 can be used to cool the data center computer room.

[0064] The wind wall cooling mechanism 310 is connected with the dry cooling heat exchanger 110 and the wet water coil 220 through a return water pipeline 410 and a water inlet pipeline 420 to form a cold water circulation loop, specifically, the return water pipeline 410 is connected with the water inlets of the dry cooling heat exchanger 110 and the wet water coil 220 through a dry return water branch 411 and a wet return water branch 412 respectively, and the water inlet pipeline 420 is connected with the water outlets of the dry cooling heat exchanger 110 and the wet water coil 220 through a dry water inlet branch 421 and a wet water inlet branch 422 respectively; the return water pipeline 410 is provided with a chilled water pump 414; the water inlet pipeline 420 is provided with a water inlet temperature sensor 423, and the return water pipeline 410 is provided with a return water temperature sensor 413. By detecting the water inlet temperature and the return water temperature of the wind wall cooling mechanism 310, the operating power of each device of the natural cooling system can be adjusted correspondingly, and the energy efficiency of the natural cooling system can be improved. The chilled water can be set as an ethanol solution.

[0065] The spraying mechanism 210 is connected with the water receiving water tank through a spraying pipeline 211 provided with a spraying water pump 212; specifically, the spraying mechanism 210 includes uniformly arranged nozzles, which spray cooling spraying water downward at the top of the wet cooling area 200, and the spraying water passes through the wet water coil 220 to take away the heat of the chilled water in the wet water coil 220; after passing through the wet water coil 220, the spraying water further enters the spraying water cooling mechanism 240 downward, preferably, the spraying water cooling mechanism 240 can be set as a PVC (Polyvinyl chloride) filler, wherein the spraying water cooling mechanism 240 is arranged in a porous structure in the vertical direction, so that the spraying water forms a thin water film in the spraying water cooling mechanism 240, and a plurality of air ducts penetrating through both sides of the spraying water cooling mechanism 240 are arranged in the horizontal direction, the water film formed by the spraying water in the spraying water cooling mechanism 240 exchanges heat with the air in the air duct, and the water molecules in part of the water film evaporate to take away the heat of the spraying water, so as to realize the cooling of the spraying water; the cooled spraying water finally falls into the water receiving water tank.

[0066] Further, the top of the dry cooling area 100 is provided with an exhaust outlet, the exhaust outlet is provided with a heat dissipation exhaust fan 120, the bottom of the dry cooling area 100 is communicated with one side of the air duct of the spray water cooling mechanism 240, so that the dry cooling area 100 and the spray water mechanism of the wet cooling area 200 form a first heat dissipation air duct; Because the spray water cooling mechanism 240 is provided with an air duct penetrating through both sides, the exhaust air can enter the dry cooling area 100 through the spray water cooling mechanism 240 by the power of the heat dissipation exhaust fan 120, and directly exchanges heat with the dry cooling heat exchanger 110; When the spray mechanism 210 is in action, the exhaust air can first exchange heat with the spray water, and then further exchange heat with the dry cooling heat exchanger 110 in the dry cooling area 100, so that the natural wind resources can be fully utilized, and the energy efficiency of the natural cooling system can be improved.

[0067] The natural cooling system is also provided with a mechanical refrigeration system, the mechanical refrigeration system includes a mechanical coil 230, a compressor 320, an evaporator 330 and a throttling valve (not shown in the figure); wherein, the mechanical coil 230 is arranged in the wet cooling area 200, specifically, the mechanical coil 230 is arranged between the wet water coil 220 and the spray water cooling mechanism 240, the compressor 320, the evaporator 330 and the throttling valve are arranged in the mechanical refrigeration area 300, the mechanical coil 230, the compressor 320, the evaporator 330 and the throttling valve are connected by refrigerant pipeline to form a refrigerant circulation loop; After the spray water exchanges heat with the wet water coil 220, it passes downward through the mechanical coil 230, and can further exchange heat with the refrigerant in the mechanical coil 230, so that the cold energy of the spray water can be effectively utilized to realize multi-stage cooling of the wet water coil 220 and the mechanical coil 230, and the energy efficiency of the natural cooling system can be improved;

[0068] The mechanical refrigeration system is arranged to further reduce the temperature of the chilled water in the chilled water circulation loop, improve the refrigerating capacity that can be provided by the natural cooling system, and meet the operation load demand of the indoor; therefore, the evaporator 330 is connected with the water inlet pipeline 420 through a first mechanical water inlet branch 424 and a mechanical water return branch 425, and is connected with the water return pipeline 410 through a second mechanical water inlet branch 416, so as 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 cooling mechanism 310, which can better provide power for the circulation of the chilled water and the introduction of the chilled water into the evaporator 330;

[0069] In addition, the wet cooling area 200 is provided with an air inlet at the top end, and one side of the upper area of the spray water cooling mechanism 240 of the wet cooling area 200, i.e. the side of the mechanical coil 230, is communicated with the dry cooling area 100, so as to form a second heat dissipation air duct between the wet cooling area 200 and the dry cooling area 100. Through the second heat dissipation air duct, outdoor fresh air can be introduced into the wet cooling area 200, and the spray water can be used to cool the wet water coil 220 and the mechanical coil 230. After cooling in the wet water area, the dry cooling heat exchanger 110 can be further cooled in the dry cooling area 100. The natural cooling system can make full use of natural cooling resources and greatly improve the energy efficiency of the natural cooling system.

[0070] In order to better utilize natural cooling resources and match specific outdoor working conditions to realize indoor refrigeration, corresponding valves are arranged on each pipeline of the natural cooling system, and a controller is arranged to control the natural cooling system. Specifically:

[0071] The first valve 510 is arranged on the dry water return branch 411, the second valve 520 is arranged on the wet water return branch 412, the third valve 530 is arranged on the dry water inlet branch 421, the water outlet of the dry cooling heat exchanger 110 is connected to the water inlet of the wet water 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 dry cooling heat exchanger 110 and the third valve 530, the other end of the intermediate branch 415 is connected to the wet water return branch 412 between the water inlet of the wet water coil 220 and the second valve 520, and the fourth valve 540 is arranged on the intermediate branch 415. The fifth valve 550 is arranged on the first mechanical water inlet branch 424, the sixth valve 560 is arranged on the second mechanical water inlet branch 416, and the seventh valve 570 is arranged between the first mechanical water inlet branch 424 and the mechanical water return branch 425 of the water inlet pipeline 420.

[0072] Embodiment 2

[0073] As Figure 2 shown, the embodiment provides a natural cooling control method, and the control method of the embodiment is applied to the natural cooling system of embodiment 1. The method comprises the following steps:

[0074] S1: acquiring an outdoor working condition, acquiring a corresponding preset standard operation mode according to the outdoor working condition, and setting an operation state of the natural cooling system according to the acquired standard operation mode;

[0075] In this step, the outdoor working condition can be obtained by dry-bulb temperature sensor and wet-bulb temperature sensor arranged outdoors; the standard operation mode at least includes dry-cooling mode, dry-cooling coupling mode, mixed refrigeration mode and mechanical refrigeration mode, and other standard operation modes can be added according to specific application scenarios, in this embodiment, dry-cooling mode, dry-cooling coupling mode, mixed refrigeration mode and mechanical refrigeration mode are mainly described, and other standard operation modes and corresponding control methods are similar to the four modes;

[0076] The natural cooling system operates according to the obtained standard operation mode, and specifically includes:

[0077] When the outdoor dry-bulb temperature is less than or equal to the first preset temperature, the natural cooling system operates in 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 natural cooling system are closed, the first valve 510, the third valve 530 and the seventh valve 570 are opened, and the heat dissipation exhaust fan 120, the wind wall cooling mechanism 310 and the chilled water pump 414 are opened; since the outdoor temperature is low at this time, the chilled water flowing out of the wind wall cooling mechanism 310 enters the dry-cooling heat exchanger 110 through the return water pipeline 410 and the dry return water branch 411, and is powered by the heat dissipation exhaust fan to make the exhaust air take away the heat of the chilled water in the dry-cooling heat exchanger 110, and then the chilled water returns to the wind wall cooling mechanism 310 through the dry inlet water branch 421 and the inlet water pipeline 420 to cool the indoor.

[0078] when the outdoor dry-bulb temperature > the first preset temperature and the outdoor wet-bulb temperature ≤ the second preset temperature, the natural cooling system runs the dry-cold coupling mode; wherein the second preset temperature is greater than the first preset temperature; in the dry-cold 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 heat dissipation air blower 120, the wind wall cooling mechanism 310, the chilled water pump 414 and the spraying mechanism 210 are opened; at this time, the spraying mechanism 210 is opened, the chilled water flowing out of the wind wall cooling mechanism 310 first enters the dry-cold heat exchanger 110 through the return water pipeline 410 and the dry return water branch 411, exchanges heat with the exhaust air for the first time in the dry-cold heat exchanger 110, then enters the wet water coil 220 through the dry water inlet branch 421, the intermediate branch 415 and the wet return water branch 412, exchanges heat with the spraying water and the fresh air entering the wet-cold area 200 through the second heat dissipation air duct, then returns to the wind wall cooling mechanism 310 through the wet water inlet branch 422 and the water inlet pipeline 420; at the same time, after exchanging heat with the wet water coil 220, the spraying water enters the spraying water cooling mechanism 240 to be cooled, and the cooled spraying water finally returns to the water receiving storage tray and circulates through the spraying water pump 212 and the spraying water pipeline.

[0079] when the outdoor wet bulb temperature is greater than or equal to the second preset temperature and less than or equal to a third preset temperature, the natural cooling system operates in the mixed refrigeration mode; the third preset temperature is greater than the second preset temperature; in the mixed refrigeration 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 heat dissipation fan 120, the wind wall cooling mechanism 310, the chilled water pump 414, the spraying mechanism 210 and the compressor 320 are opened; at this time, since the outdoor temperature is high, pure natural cooling resources cannot meet the indoor operating load, and additional mechanical refrigeration is needed to further reduce the temperature; the chilled water flowing out of the wind wall cooling system does not pass through the dry cooling heat exchanger 110, but directly enters the wet water coil 220 for heat exchange; the spraying water can first exchange heat with the fresh air of the second heat dissipation air duct, and then exchange heat with the wet water coil 220; the chilled water enters the water inlet pipeline 420 after being cooled in the wet water coil 220; the temperature of the chilled water is detected by the water inlet temperature sensor 423 on the water inlet pipeline 420; if the temperature of the chilled water exceeds a certain threshold value, the seventh valve 570 is closed, 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 cooling mechanism 310 through the mechanical water return branch 425; the refrigerant in the evaporator 330 enters the mechanical coil 230 in the wet cooling area 200 after heat exchange with the chilled water, exchanges heat with the spraying water, and the temperature of the spraying water rises by 2-3℃ after heat exchange with the wet water coil 220; but in the current outdoor working condition, the temperature of the spraying water is still lower than that of the refrigerant after the evaporator 330, so the spraying water can exchange heat with the refrigerant to reduce the temperature of the refrigerant.

[0080] When the outdoor wet-bulb temperature is greater than or equal to the third preset temperature, the natural cooling cooling system operates in 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 heat dissipation exhaust fan 120, the wind wall cooling mechanism 310, the chilled water pump 414, the spraying mechanism 210 and the compressor 320 are opened. At this time, since the outdoor temperature is too high, multi-stage cooling cannot be achieved by the spraying water, and therefore, at this time, the mechanical refrigeration system is equivalent to being opened, the chilled water flowing out of the wind wall cooling mechanism 310 directly enters the evaporator 330 to exchange heat with the refrigerant through the second mechanical water inlet branch 416, and then returns to the wind wall cooling mechanism 310 through the mechanical water return branch 425 after heat exchange, and the refrigerant after heat exchange enters the mechanical coil 230 to exchange heat with the spraying water.

[0081] The first preset temperature, the second preset temperature and the third preset temperature can be set according to the environment and the indoor operating load of the natural cooling system.

[0082] S2: Obtain the indoor operating load, and set the operating parameters of the natural cooling system according to the operating strategy preset in the standard operating mode currently operated according to the indoor operating load;

[0083] Specifically, in this step, first, the refrigerating capacity required to be provided by the natural cooling system is obtained according to the indoor operating load; then, the operating strategy in the standard operating mode is obtained according to the refrigerating capacity; wherein the operating strategy includes the power of the wind wall cooling mechanism 310, the chilled water pump 414, the heat dissipation exhaust fan 120, the spraying water pump 212 and the compressor 320 in the natural cooling system, that is, the specific operating power parameters of each device in the natural cooling system, and the natural cooling system can well meet the demand for the refrigerating capacity under the operating strategy; therefore, the power of the wind wall cooling mechanism 310, the chilled water pump 414, the heat dissipation exhaust fan 120, the spraying water pump 212 and the compressor 320 is set according to the operating strategy, respectively.

[0084] Although the natural cooling system operating according to the operating strategy can meet the demand for the refrigerating capacity, the natural cooling system operating under the operating strategy is not the most energy-efficient condition due to the influence of actual conditions.

[0085] S3: Adjust the operating parameters of the natural cooling system according to the optimization adjustment strategy preset in the standard operating mode currently operated according to the indoor operating load;

[0086] Specifically, in this step, the optimization adjustment strategy needs to ensure that the refrigerating capacity of the natural cooling system can meet the indoor operating load, and the optimization adjustment strategy is specifically:

[0087] In the dry cooling mode and mechanical refrigeration mode, the chilled water flows into the dry cooling heat exchanger 110 or the evaporator 330 through the wind wall cooling mechanism 310, the resistance of the entire flow path is small, but the pressure head of the wind wall cooling mechanism 310 is high, so under the premise of ensuring the refrigerating capacity, when the flow rate of the chilled water does not exceed the preset flow rate threshold, according to the specific calculation formula of the refrigerating capacity: refrigerating capacity = temperature difference between inlet and outlet * chilled water circulation quantity * specific heat capacity of chilled water, the flow rate (chilled water circulation quantity) of the chilled water is preferentially increased, that is, the power of the chilled water pump 414 is gradually increased, and the power (temperature difference between inlet and outlet) of the wind wall cooling mechanism 310 is reduced at the same time; when the flow rate of the chilled water exceeds the preset flow rate threshold, or in the process of increasing the flow rate of the chilled water, the flow rate of the chilled water exceeds the preset flow rate threshold, at this time, the flow rate of the chilled water needs to be continuously increased, which corresponds to the increase of the power of the chilled water pump 414, so in the adjustment process, it is necessary to ensure that the flow rate of the chilled water does not exceed the preset flow rate threshold.

[0088] In the dry cooling coupled mode and mixed refrigeration mode, since the wet water coil 220 is added, it is necessary to adjust the power balance between the spray water pump 212 and the heat dissipation exhaust fan, and the compressor 320, which is mainly achieved by detecting the temperature difference between the inlet and outlet of the chilled water of the wind wall cooling mechanism 310. The temperature difference between the inlet and outlet can be obtained by the water inlet temperature sensor 423 and the water return temperature sensor 413 arranged on the water inlet pipeline 420 and the water return pipeline 410 respectively. Specifically, according to the specific calculation formula of the refrigerating capacity: refrigerating capacity = temperature difference between inlet and outlet * chilled water circulation quantity * specific heat capacity of chilled water, when the temperature difference between the inlet and outlet of the chilled water does not exceed the preset temperature difference threshold, the flow rate of the chilled water is preferentially reduced, that is, the power of the chilled water pump 414 is gradually reduced to increase the temperature difference between the inlet and outlet, and the power of the wind wall cooling mechanism 310 is continuously increased, so that the wind wall cooling mechanism can dynamically adjust the overall energy consumption of the natural cooling system under the condition of meeting the refrigerating capacity, so as to minimize the energy consumption.

[0089] S4: Obtain the preferred operation strategy of the natural cooling system with the optimal energy efficiency in the adjustment process, and update the operation strategy of the standard operation mode corresponding to the outdoor working condition and the indoor operating load according to the preferred operation state.

[0090] Specifically, in this step, the energy efficiency of the natural cooling system is the ratio of the refrigerating capacity of the natural cooling system to the total energy consumption of the natural cooling system.

[0091] The total energy consumption of the natural cooling system is the sum of the power of the wind wall cooling mechanism 310, the power of the chilled water pump 414, the power of the heat dissipation exhaust fan 120, the power of the spray water pump 212 and the power of the compressor 320.

[0092] The optimal energy efficiency represents the highest energy efficiency, and in the case of ensuring the refrigerating capacity, the total energy consumption of the natural cooling system needs to be reduced, and the total energy consumption of the natural cooling system in the lowest case is obtained through the optimization adjustment strategy, and the optimization adjustment strategy specifically comprises the following steps:

[0093] The powers of the wind wall cooling mechanism 310, the chilled water pump 414, the heat dissipation exhaust fan 120, the spray water pump 212 and the compressor 320 in the adjustment process of the optimization adjustment strategy in the standard operation mode are obtained when the energy consumption is the lowest, and in the corresponding standard operation mode, if the wind wall cooling mechanism 310, the chilled water pump 414, the heat dissipation exhaust fan 120, the spray water pump 212 or the compressor 320 is not started, the corresponding power is 0;

[0094] The powers of the wind wall cooling mechanism 310, the chilled water pump 414, the heat dissipation exhaust fan 120, the spray water pump 212 and the compressor 320 when the energy consumption is the lowest are recorded as the preferred operation strategy;

[0095] The powers of the wind wall cooling mechanism 310, the chilled water pump 414, the heat dissipation exhaust fan 120, the spray water pump 212 and the compressor 320 corresponding to the operation strategy in the standard operation mode under the outdoor working condition and the indoor operation load are updated according to the preferred operation strategy.

[0096] After the operation strategy in the standard operation mode is updated, when the same outdoor working condition and indoor operation load appear, the selected standard operation mode and the corresponding operation strategy can make the natural cooling system run in the state of optimal energy efficiency, and through the preset standard operation mode and the continuously optimized iteration in the running process, the natural cooling system can always run in the optimal energy efficiency, thereby reducing the energy consumption of the natural cooling system.

[0097] Obviously, the above embodiments of the present application are only examples for clearly illustrating the technical solutions of the present application, and are not intended to limit the specific embodiments of the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the claims of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A natural cooling system characterized by, The natural cooling system comprises a dry cooling area, a wet cooling area and a mechanical refrigeration area arranged in sequence; The dry cooling area is provided with a dry cooling heat exchanger; The wet cooling area is provided with a spraying mechanism, a wet water coil, a spraying water cooling mechanism and a water collecting tray from top to bottom; The mechanical refrigeration area is provided with a wind wall cooling mechanism for cooling the indoor environment; The spraying mechanism is connected with the water collecting tray through a spraying pipeline provided with a spraying water pump; The top of the dry cooling area is provided with an air outlet, and the air outlet is provided with a heat dissipation exhaust fan; the spraying water cooling mechanism is provided with an air duct penetrating through both sides of the spraying water cooling mechanism; the bottom of the dry cooling area is in communication with one side of the air duct of the spraying water cooling mechanism; The wind wall cooling mechanism is connected with the dry cooling heat exchanger and the wet water coil through a return water pipeline and an inlet water pipeline to form a cold water circulation loop; the return water pipeline is connected with the inlet of the dry cooling heat exchanger and the wet water coil through a dry return water branch and a wet return water branch respectively; the inlet water pipeline is connected with the outlet of the dry cooling heat exchanger and the wet water coil through a dry inlet water branch and a wet inlet water branch respectively; and the return water pipeline is provided with a chilled water pump; The dry return water branch is provided with a first valve, the wet return water branch is provided with a second valve, the dry inlet water branch is provided with a third valve, the outlet of the dry cooling heat exchanger is connected with the inlet of the wet water coil through an intermediate branch, one end of the intermediate branch is connected with the dry inlet water branch between the outlet of the dry cooling heat exchanger and the third valve, the other end of the intermediate branch is connected with the wet return water branch between the inlet of the wet water coil and the second valve, and the intermediate branch is provided with a fourth valve.

2. A natural cooling system according to claim 1, wherein, The wet cooling area is further provided with a mechanical coil arranged between the wet water coil and the spraying water cooling mechanism; The mechanical refrigeration area is further provided with a compressor, an evaporator and a throttling valve; The compressor, the mechanical coil, the evaporator and the throttling valve are connected through a refrigerant pipeline to form a refrigerant circulation loop; The evaporator is connected with the inlet water pipeline through a first mechanical inlet water branch and a mechanical return water branch, and is connected with the return water pipeline through a second mechanical inlet water branch; the chilled water is introduced into the evaporator to exchange heat with the refrigerant; and the chilled water pump is arranged between the second mechanical inlet water branch and the outlet of the wind wall cooling mechanism; The first mechanical inlet water branch is provided with a fifth valve, the second mechanical inlet water branch is provided with a sixth valve, and the first mechanical inlet water branch and the mechanical return water branch of the inlet water pipeline are provided with a seventh valve between the connection ends.

3. A natural cooling system according to claim 2, wherein, An air inlet is formed at the top end of the wet cooling area; One side of the upper region of the spraying water cooling mechanism of the wet cooling area is in communication with the dry cooling area.

4. A natural cooling system according to any one of claims 1-3, characterized in that A water inlet temperature sensor is arranged on the inlet water pipeline, and a return water temperature sensor is arranged on the return water pipeline.

5. A natural cooling control method characterized by, The method is applied to the natural cooling system of any one of claims 1-4, and the method comprises: acquiring an outdoor working condition, acquiring a preset standard operation mode corresponding to the outdoor working condition, and setting an operation state of the natural cooling system according to the acquired standard operation mode; acquiring an indoor operation load, and setting an operation parameter of the natural cooling system according to the indoor operation load and a preset operation strategy in the standard operation mode currently running; adjusting the operation parameter of the natural cooling system according to the indoor operation load and a preset optimization adjustment strategy in the standard operation mode currently running; acquiring an optimal operation strategy of the natural cooling system in an energy efficiency optimization adjustment process, and updating an operation strategy of the standard operation mode corresponding to the outdoor working condition and the indoor operation load according to the optimal operation strategy.

6. The natural cooling control method according to claim 5, wherein The standard operation mode at least includes a dry cooling mode, a dry cooling coupling mode, a mixed refrigeration mode, and a mechanical refrigeration mode. The acquiring of the standard operation mode corresponding to the outdoor working condition and the setting of the operation state of the natural cooling system according to the acquired standard operation mode specifically include: when the outdoor dry-bulb temperature is less than or equal to a first preset temperature, the natural cooling system runs in the dry cooling mode; in the dry cooling mode, the fifth valve, the sixth valve, the second valve, and the fourth valve in the natural cooling system are closed, the first valve, the third valve, and the seventh valve are opened, and the heat dissipation exhaust fan, the wind wall cooling mechanism, and the chilled water pump are opened; when the outdoor dry-bulb temperature is greater than the first preset temperature and the outdoor wet-bulb temperature is less than or equal to a second preset temperature, the natural cooling system runs in the dry cooling coupling mode; in the dry cooling coupling mode, the fifth valve, the sixth valve, the second valve, and the third valve are closed, the first valve, the fourth valve, and the seventh valve are opened, and the heat dissipation exhaust fan, the wind wall cooling mechanism, the chilled water pump, and the spraying mechanism are opened; the second preset temperature is greater than the first preset temperature; when the outdoor wet-bulb temperature is greater than the second preset temperature and less than or equal to a third preset temperature, the natural cooling system runs in the mixed refrigeration mode; in the mixed refrigeration mode, the seventh valve, the sixth valve, the first valve, the fourth valve, and the third valve are closed, the second valve and the fifth valve are opened, and the heat dissipation exhaust fan, the wind wall cooling mechanism, the chilled water pump, the spraying mechanism, and the compressor are opened; the third preset temperature is greater than the second preset temperature when the outdoor wet-bulb temperature is greater than the third preset temperature, the natural cooling system runs in the mechanical refrigeration mode; in the mechanical refrigeration mode, the seventh valve, the fifth valve, the first valve, the second valve, the fourth valve, and the third valve are closed, the sixth valve is opened, and the heat dissipation exhaust fan, the wind wall cooling mechanism, the chilled water pump, the spraying mechanism, and the compressor are opened.

7. The natural cooling control method according to claim 6, wherein The setting of the operation parameter of the natural cooling system according to the indoor operation load and the preset operation strategy in the standard operation mode currently running specifically includes: acquiring a refrigeration amount required to be provided by the natural cooling system according to the indoor operation load; According to the refrigeration capacity, an operation strategy in the standard operation mode is obtained; the operation strategy includes powers of a wind wall cooling mechanism, a chilled water pump, a heat dissipation exhaust fan, a spray water pump and a compressor in the natural cooling system; According to the operation strategy, the powers of the wind wall cooling mechanism, the chilled water pump, the heat dissipation exhaust fan, the spray water pump and the compressor are respectively set.

8. The natural cooling control method according to claim 7, wherein According to the indoor operation load and a preset optimization adjustment strategy in the standard operation mode currently running, the operation parameters of the natural cooling system are adjusted, specifically including: Under the premise that the refrigeration capacity of the natural cooling system can meet the indoor operation load, the preset optimization adjustment strategy in the standard operation mode is run; The preset optimization adjustment strategy in the standard operation mode is specifically: In the dry cooling mode and the mechanical refrigeration mode, when the flow rate of the chilled water does not exceed a preset flow rate threshold, the power of the chilled water pump is gradually increased and the power of the wind wall cooling mechanism is gradually decreased; when the flow rate of the chilled water exceeds the preset flow rate threshold, the powers of the wind wall cooling mechanism and the heat dissipation exhaust fan are gradually increased. In the dry cooling coupling mode and the hybrid refrigeration mode, when the temperature difference between the inlet and outlet of the chilled water of the wind wall cooling mechanism does not exceed a preset temperature difference threshold, the power of the chilled water pump is gradually decreased and the power of the wind wall cooling mechanism is gradually increased.

9. The natural cooling control method according to claim 5, wherein The energy efficiency of the natural cooling system is a ratio of the refrigeration capacity of the natural cooling system to total energy consumption of the natural cooling system; The total energy consumption of the natural cooling system is a sum of the powers of the wind wall cooling mechanism, the chilled water pump, the heat dissipation exhaust fan, the spray water pump and the compressor.

10. The natural cooling control method according to claim 9, wherein The preferred operation strategy in which the energy efficiency of the natural cooling system is optimal in the adjustment process is obtained, and the operation strategy of the standard operation mode corresponding to the outdoor working condition and the indoor operation load is updated according to the preferred operation state, specifically including: The powers of the wind wall cooling mechanism, the chilled water pump, the heat dissipation exhaust fan, the spray water pump and the compressor when the energy consumption is lowest in the adjustment process of the optimization adjustment strategy in the standard operation mode are obtained; The powers of the wind wall cooling mechanism, the chilled water pump, the heat dissipation exhaust fan, the spray water pump and the compressor when the energy consumption is lowest are recorded as the preferred operation strategy; The powers of the wind wall cooling mechanism, the chilled water pump, the heat dissipation exhaust fan, the spray water pump and the compressor corresponding to the operation strategy in the standard operation mode under the outdoor working condition and the indoor operation load are updated according to the preferred operation strategy.

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