Indirect evaporation double-cold-source all-in-one machine

Abstract

The utility model relates to an indirect evaporation double-cold-source all-in-one machine which comprises a plate heat exchanger, a cooling-water machine, a cooling pump, a pre-cooling pump, an electric valve, a controller, a pre-cooling cold source module and a cooling cold source module, a water outlet of the pre-cooling cold source module is communicated with a water inlet end of the pre-cooling pump, and a water outlet end of the pre-cooling pump is communicated with a cold end inlet of the plate heat exchanger. A cold end outlet of the plate heat exchanger communicates with a water inlet of the pre-cooling cold source module, a hot end inlet of the plate heat exchanger communicates with a liquid outlet of the air conditioner tail end, and a hot end outlet of the plate heat exchanger and a water outlet of the evaporation heat exchange end of the cooling-water machine communicate with a liquid inlet of the air conditioner tail end. A water inlet of an evaporation heat exchange end of the cooling-water machine is communicated with a liquid outlet of the tail-end air conditioner, a water inlet of a condensation heat exchange end of the cooling-water machine is communicated with a water outlet end of the cooling pump, a water inlet end of the cooling pump is communicated with a water outlet of the cooling cold source module, and a water outlet of the condensation heat exchange end of the cooling-water machine is communicated with a water inlet of the cooling cold source module. The refrigerating capacity can be improved, and energy conservation and consumption reduction are achieved.

Description

Technical Field

[0001] This utility model relates to the field of data center cooling systems, specifically to an integrated indirect evaporation dual-cold-source unit. Background Technology

[0002] In data centers and other fields, chiller units need to operate year-round to maintain a constant indoor temperature and cool the equipment in the server room to ensure its normal operation. Under the dual pressure of energy conservation, emission reduction, and lower operating costs, there is a need to continuously develop new energy-saving technologies and products to make full use of server room space in a simpler and more convenient way, saving rooftop chiller room area, reducing chiller room construction costs, reducing on-site cooling water pipe installation, and reducing cooling water pump head, thereby achieving energy savings. Utility Model Content

[0003] To overcome the shortcomings of existing products and technologies, this utility model provides an integrated indirect evaporation dual-cooling-source unit and its control method. The cooling tower's internal cooling source module and pre-cooling source module water systems are independently controlled. The temperature difference between the inlet and outlet water of the inner cooling source module and the outer pre-cooling source module meets the set temperature requirements of the chiller and air conditioning terminals. Divided into two independent parts, it can meet two modes: chiller and cooling tower operation in summer, and chiller shutdown and cooling tower operation in winter. The independent control of the water system provides higher stability.

[0004] The technical solution of this utility model embodiment is as follows:

[0005] An integrated indirect evaporation dual-cold-source unit includes a dual-cold-source cooling tower, a plate heat exchanger, a chiller, a cooling pump, a pre-cooling pump, an electric valve, and a controller. The dual-cold-source cooling tower includes independent pre-cooling cold source modules and cooling cold source modules. The pre-cooling cold source module is located outside the cooling cold source module. The outlet of the pre-cooling cold source module is connected to the inlet of the pre-cooling pump via a pipe. The outlet of the pre-cooling pump is connected to the cold end inlet of the plate heat exchanger via a pipe. The cold end outlet of the plate heat exchanger is connected to the inlet of the pre-cooling cold source module via a pipe. The hot end inlet of the plate heat exchanger is connected to the liquid outlet of an air conditioning terminal via a pipe. The hot end outlet of the plate heat exchanger is connected to the liquid inlet of the air conditioning terminal via a pipe. The chiller... The inlet of the evaporative heat exchanger is connected to the liquid outlet of the terminal air conditioner through a pipe. The outlet of the evaporative heat exchanger of the chiller is connected to the liquid inlet of the terminal air conditioner through a pipe. The inlet of the condenser heat exchanger of the chiller is connected to the outlet of the cooling pump through a pipe. The inlet of the cooling pump is connected to the outlet of the cooling source module through a pipe. The outlet of the condenser heat exchanger of the chiller is connected to the inlet of the cooling source module through a pipe. The two ends of the electric valve are connected to the hot end outlet of the plate heat exchanger and the outlet of the evaporative heat exchanger of the chiller through pipes respectively. The chiller, the cooling pump, the precooling pump, the electric valve, the cooling source module, the precooling source module, and the controller are electrically connected.

[0006] Preferably, the precooling cold source module includes an upper precooling water distributor, an upper precooling packing, a precooling water receiving tray, a lower precooling water distributor, a lower precooling packing, a precooling water tank, a precooling surface cooler, and a precooling circulating pump. The outlet of the precooling water tank is connected to the inlet of the precooling pump via a pipe. The outlet of the precooling water tank is also connected to the inlet of the precooling circulating pump via a pipe. The outlet of the precooling circulating pump is connected to one end of the precooling surface cooler via a pipe. The other end of the precooling surface cooler is connected to the precooling water receiving tray via a pipe. The outlet of the precooling water receiving tray is connected to... The system is connected to the lower precooling water distributor via a pipeline. The lower precooling packing is located below the lower precooling water distributor and above the precooling water tank. The upper precooling packing is located above the precooling water receiving tray. The upper precooling water distributor is located above the upper precooling packing. The precooling water receiving tray is located above the lower precooling water distributor. The upper precooling water distributor is connected to the cold end outlet of the plate heat exchanger via a pipeline. The precooling surface cooler is located in front of the air inlet direction of the lower precooling packing. The precooling circulation pump is electrically connected to the controller.

[0007] Preferably, the cooling source module includes an upper cooling water distributor, an upper cooling packing, a cooling water receiving tray, a lower cooling water distributor, a lower cooling packing, and a cooling water tank. The outlet of the cooling water tank is connected to the inlet of the cooling pump via a pipe. The outlet of the cooling water receiving tray is connected to the lower cooling water distributor via a pipe. The lower cooling packing is located below the lower cooling water distributor and above the cooling water tank. The upper cooling packing is located above the cooling water receiving tray. The upper cooling water distributor is located above the upper cooling packing. The cooling water receiving tray is located above the lower cooling water distributor. The upper cooling water distributor is connected to the outlet of the condenser heat exchange end of the chiller via a pipe.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0009] This single cooling tower features two layers: an outer layer containing water at a lower wet-bulb temperature, used to pre-cool the chilled water in the terminal air conditioning units; and an inner layer containing water at a relatively higher temperature, used as cooling water for the chiller's condenser. Compared to using a separate cooling tower, this improves the cleanliness of the chiller's cooling water. Furthermore, during transitional seasons and winter, the outer water temperature preheats the air, and the chiller's cooling water temperature can be maintained at a level that allows the chiller to operate normally through an overall control strategy. Since both layers share a single fan, it not only significantly saves energy but also greatly increases the cooling capacity of a single cooling tower. Integrating two cooling towers into one also significantly reduces the footprint of rooftop cooling towers. Attached Figure Description

[0010] Figure 1 This is a schematic diagram illustrating the structural principle of an indirect evaporation dual-cooling-source integrated machine according to this utility model;

[0011] Figure 2 This is a schematic diagram illustrating the structural principle of an indirect evaporation dual-cooling-source integrated unit in summer operation according to this utility model;

[0012] Figure 3 This is a schematic diagram illustrating the structural principle of an indirect evaporation dual-cooling-source integrated unit in this utility model during the transitional season and winter.

[0013] 10. Pre-cooling cold source module; 11. Upper pre-cooling water distributor; 12. Upper pre-cooling packing; 13. Pre-cooling water receiving tray; 14. Lower pre-cooling water distributor; 15. Lower pre-cooling packing; 16. Pre-cooling water tank; 17. Pre-cooling surface cooler; 18. Pre-cooling circulating pump; 20. Cooling cold source module; 21. Upper cooling water distributor; 22. Upper cooling packing; 23. Cooling water receiving tray; 24. Lower cooling water distributor; 25. Lower cooling packing; 26. Cooling water tank; 30. Plate heat exchanger; 40. Chiller; 50. Cooling pump; 60. Pre-cooling pump; 70. Electric valve; 80. Air conditioning terminal. Detailed Implementation

[0014] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0015] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0017] like Figure 1 As shown, Figure 1This is a schematic diagram illustrating the structural principle of an integrated indirect evaporation dual-cold-source unit according to the present invention. The integrated indirect evaporation dual-cold-source unit includes a dual-cold-source cooling tower, a plate heat exchanger 30, a chiller 40, a cooling pump 50, a pre-cooling pump 60, an electric valve 70, and a controller. The dual-cold-source cooling tower includes an independent pre-cooling cold-source module 10 and a cooling cold-source module 20. The pre-cooling cold-source module 10 is located outside the cooling cold-source module 20. The outlet of the pre-cooling cold-source module 10 is connected to the inlet of the pre-cooling pump 60 via a pipe. The outlet of the pre-cooling pump 60 is connected to the cold-end inlet of the plate heat exchanger 30 via a pipe. The cold-end outlet of the plate heat exchanger 30 is connected to the inlet of the pre-cooling cold-source module 10 via a pipe. The hot-end inlet of the plate heat exchanger 30 is connected to the liquid outlet of an air conditioning terminal 80 via a pipe. The hot-end outlet of the plate heat exchanger 30 is connected to the liquid outlet of an air conditioning terminal 80 via a pipe. The inlet of the chiller 40 is connected to the liquid inlet of the evaporative heat exchange end of the chiller 40. The outlet of the evaporative heat exchange end of the chiller 40 is connected to the liquid inlet of the terminal air conditioner 80 through a pipe. The inlet of the condenser heat exchange end of the chiller 40 is connected to the outlet of the cooling pump 50 through a pipe. The inlet of the cooling pump 50 is connected to the outlet of the cooling source module 20 through a pipe. The outlet of the condenser heat exchange end of the chiller 40 is connected to the inlet of the cooling source module 20 through a pipe. The two ends of the electric valve 70 are connected to the hot end outlet of the plate heat exchanger 30 and the outlet of the evaporative heat exchange end of the chiller 40 through pipes, respectively. The chiller 40, the cooling pump 50, the precooling pump 60, the electric valve 70, the cooling source module 20, the precooling source module 10 and the controller are electrically connected.

[0018] This utility model integrates a chiller and cooling tower into one unit, requiring only connection to chilled water and electricity on-site. It simplifies cooling water piping, adds a pre-cooling heat exchanger assembly, and saves installation costs. Currently, the integrated unit can achieve a cooling capacity of 200-800 RT or even greater, achieving more precise control. It combines natural and mechanical cooling, switching modes by controlling the opening and closing of electric valves, chiller, cooling pump, and pre-cooling pump, making maintenance and repair convenient. Only one set of coil heat exchangers is needed at the air conditioning terminal, enabling 24-hour uninterrupted operation year-round. In mechanical cooling mode, the COP ≥ 10, resulting in higher overall energy efficiency throughout the year, combining mechanical and natural cooling.

[0019] The chiller of this utility model is an air-suspension chiller, specifically composed of an air-suspension centrifugal compressor, a shell and tube condenser, a flooded evaporator, and a throttling device.

[0020] This utility model discloses a dual-layer cooling tower with a dual cold source structure. It employs indirect evaporation to produce low-temperature cooling water at different temperatures. The outer layer is a pre-cooling cold source module, and the inner layer is a cooling cold source module. The pre-cooled cooling water serves as the cooling water for the terminal air conditioning chilled water, while the cooling water serves as the cooling water for the chiller. The principle is to use water from the outer layer, which is below the wet-bulb temperature, to pre-cool the chilled water, and to use water from the inner layer, which has a relatively higher temperature, as the cooling water for the chiller. The advantages of this design are: compared to using a single cooling tower, it improves the cleanliness of the chiller's cooling water; and during low-temperature seasons, the outer water temperature preheats the air, allowing the chiller's cooling water temperature to be maintained at a level that enables the chiller to operate normally through an overall control strategy. Furthermore, because the inner and outer layers share a single fan, it not only significantly saves energy but also greatly increases the cooling capacity of a single cooling tower. Integrating two cooling towers into one also significantly reduces the footprint of rooftop cooling towers.

[0021] The integrated unit operates in two modes: hybrid cooling and natural cooling, depending on the external temperature. The controller detects the external temperature through a temperature sensor and determines that the external temperature is greater than a first set value. In this invention, the first set value is 22°C. When the external ambient temperature is >22°C, the integrated unit enters the hybrid cooling mode. At this time, the air-suspended chiller runs, the plate heat exchanger works, the controller controls the electric valve to disconnect, and the chiller, cooling pump, and precooling pump are turned on. The integrated unit operates in the hybrid cooling mode. When the external temperature is <22°C, the integrated unit enters the natural cooling mode. At this time, the controller controls the chiller and cooling pump to close, the electric valve and precooling pump to open, the plate heat exchanger works, and the integrated unit operates in the natural cooling mode.

[0022] like Figure 2 As shown, Figure 2 This is a schematic diagram of the structural principle of an indirect evaporation dual-cold source integrated unit in summer operation according to this utility model. When the external temperature is >22℃, the integrated unit enters the mixed cooling mode, the chiller runs, the plate heat exchanger works, the cooling water of the cooling cold source module exchanges heat with the condenser heat exchange end of the chiller, the chilled return water first passes through the plate heat exchanger, and after pre-cooling heat exchange with the pre-cooling cooling water of the pre-cooling cold source module, it enters the chiller for secondary heat exchange to meet the normal cooling needs.

[0023] like Figure 3 As shown, Figure 3 This is a schematic diagram of the structural principle of an indirect evaporation dual-cold source integrated unit in this utility model during the transition season and winter. When the external ambient temperature is <22℃, it enters the natural cooling mode, the air suspension compressor stops running, the plate heat exchanger starts, and the natural cooling mode cycle is completed. The chilled water of the terminal air conditioner and the cooling water of the pre-cooling cold source module can exchange heat through the plate heat exchanger, and after the temperature is reduced, it returns to the terminal air conditioner.

[0024] Regarding how the precooling cold source module obtains cooling water, preferably, the precooling cold source module 10 includes an upper precooling water distributor 11, an upper precooling packing 12, a precooling water receiving tray 13, a lower precooling water distributor 14, a lower precooling packing 15, a precooling water tank 16, a precooling surface cooler 17, and a precooling circulating pump 18. The outlet of the precooling water tank 16 is connected to the inlet of the precooling pump 10 via a pipe. The outlet of the precooling water tank 16 is also connected to the inlet of the precooling circulating pump 18 via a pipe. The outlet of the precooling circulating pump 18 is connected to one end of the precooling surface cooler 17 via a pipe. The other end of the precooling surface cooler 17 is connected to the precooling water receiving tray 13 via a pipe. The outlet of the cold water receiving pan 13 is connected to the lower precooling water distributor 14 through a pipe. The lower precooling packing 15 is located below the lower precooling water distributor 47 and above the precooling water tank 16. The upper precooling packing 12 is located above the precooling water receiving pan 13. The upper precooling water distributor 11 is located above the upper precooling packing 12. The precooling water receiving pan 13 is located above the lower precooling water distributor 14. The upper precooling water distributor 11 is connected to the cold end outlet of the plate heat exchanger 30 through a pipe. The precooling surface cooler 17 is located in front of the air inlet direction of the lower precooling packing 15. The precooling circulation pump 18 is electrically connected to the controller.

[0025] By setting up upper and lower layers of packing, the high-temperature cooling water return water is distributed from the upper water distributor into the upper packing. After evaporative heat exchange with the outside air, it collects in the water receiving pan. Then, it passes through the lower water distributor, distributing the cooling water into the lower packing. There, it undergoes secondary evaporative heat exchange with the pre-cooled outside air. The cooled water collects in the water receiving tank and is then pumped by the pre-cooling circulation pump to the pre-cooling surface cooler. In summer, this pre-cools the outside air, and in winter, it warms the outside air, preventing the cooling water in the packing from frost or freezing. The cooling water in the pre-cooling surface cooler is then transported to the upper water distributor, and the cycle continues.

[0026] Regarding how the cooling source module obtains cooling water, preferably, the cooling source module 20 includes an upper cooling water distributor 21, an upper cooling packing 22, a cooling water receiving tray 23, a lower cooling water distributor 24, a lower cooling packing 25, and a cooling water tank 26. The outlet of the cooling water tank 26 is connected to the inlet of the cooling pump 50 through a pipe. The outlet of the cooling water receiving tray 23 is connected to the lower cooling water distributor 24 through a pipe. The lower cooling packing 25 is located below the lower cooling water distributor 24 and above the cooling water tank 26. The upper cooling packing 22 is located above the cooling water receiving tray 23. The upper cooling water distributor 21 is located above the upper cooling packing 22. The cooling water receiving tray 23 is located above the lower cooling water distributor 24. The upper cooling water distributor 21 is connected to the outlet of the condenser heat exchange end of the chiller 40 through a pipe.

[0027] By setting up two layers of packing, the high-temperature cooling water returning from the chiller is distributed from the upper water distributor into the upper packing. After evaporative heat exchange with the outside air, it collects in the water receiving pan. Then, it passes through the lower water distributor and is distributed into the lower packing, where it undergoes secondary evaporative heat exchange with the outside air. The cooled water collects in the water receiving tank and is then transported to the chiller to exchange heat and cool the condenser end. This cycle continues.

[0028] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0029] This single cooling tower features two layers: an outer layer containing water at a lower wet-bulb temperature, used to pre-cool the chilled water in the terminal air conditioning units; and an inner layer containing water at a relatively higher temperature, used as cooling water for the chiller's condenser. Compared to using a separate cooling tower, this improves the cleanliness of the chiller's cooling water. Furthermore, during transitional seasons and winter, the outer water temperature preheats the air, and the chiller's cooling water temperature can be maintained at a level that allows the chiller to operate normally through an overall control strategy. Since both layers share a single fan, it not only significantly saves energy but also greatly increases the cooling capacity of a single cooling tower. Integrating two cooling towers into one also significantly reduces the footprint of rooftop cooling towers.

[0030] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0031] The above embodiments only illustrate preferred implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An integrated indirect evaporation dual-cooling-source unit, characterized in that: The system includes a dual-source cooling tower, a plate heat exchanger, a chiller, a cooling pump, a pre-cooling pump, electric valves, and a controller. The dual-source cooling tower comprises independent pre-cooling and cooling source modules. The pre-cooling source module is located outside the cooling source module. The outlet of the pre-cooling source module is connected to the inlet of the pre-cooling pump via a pipe. The outlet of the pre-cooling pump is connected to the cold end inlet of the plate heat exchanger via a pipe. The cold end outlet of the plate heat exchanger is connected to the inlet of the pre-cooling source module via a pipe. The hot end inlet of the plate heat exchanger is connected to the liquid outlet of an air conditioning terminal via a pipe. The hot end outlet of the plate heat exchanger is connected to the liquid inlet of the air conditioning terminal via a pipe. The chiller's evaporative heat exchange end... The water inlet is connected to the liquid outlet of the terminal air conditioner via a pipe. The water outlet of the evaporative heat exchange end of the chiller is connected to the liquid inlet of the terminal air conditioner via a pipe. The water inlet of the condenser heat exchange end of the chiller is connected to the water outlet of the cooling pump via a pipe. The water inlet of the cooling pump is connected to the water outlet of the cooling source module via a pipe. The water outlet of the condenser heat exchange end of the chiller is connected to the water inlet of the cooling source module via a pipe. The two ends of the electric valve are connected to the hot end outlet of the plate heat exchanger and the water outlet of the evaporative heat exchange end of the chiller via pipes, respectively. The chiller, the cooling pump, the precooling pump, the electric valve, the cooling source module, the precooling source module, and the controller are electrically connected.

2. The indirect evaporation dual-cooling-source integrated machine according to claim 1, characterized in that: The precooling cold source module includes an upper precooling water distributor, upper precooling packing, a precooling water receiving tray, a lower precooling water distributor, lower precooling packing, a precooling water tank, a precooling surface cooler, and a precooling circulating pump. The outlet of the precooling water tank is connected to the inlet of the precooling pump via a pipe. The outlet of the precooling water tank is also connected to the inlet of the precooling circulating pump via a pipe. The outlet of the precooling circulating pump is connected to one end of the precooling surface cooler via a pipe. The other end of the precooling surface cooler is connected to the precooling water receiving tray via a pipe. The outlet of the precooling water receiving tray is connected to... The upper precooling packing is connected to the lower precooling water distributor. The lower precooling packing is located below the lower precooling water distributor and above the precooling water tank. The upper precooling packing is located above the precooling water receiving tray. The upper precooling water distributor is located above the upper precooling packing. The precooling water receiving tray is located above the lower precooling water distributor. The upper precooling water distributor is connected to the cold end outlet of the plate heat exchanger through a pipe. The precooling surface cooler is located in front of the air inlet direction of the lower precooling packing. The precooling circulation pump is electrically connected to the controller.

3. The indirect evaporation dual-cooling-source integrated machine according to claim 2, characterized in that: The cooling source module includes an upper cooling water distributor, an upper cooling packing, a cooling water receiving tray, a lower cooling water distributor, a lower cooling packing, and a cooling water tank. The outlet of the cooling water tank is connected to the inlet of the cooling pump via a pipe. The outlet of the cooling water receiving tray is connected to the lower cooling water distributor via a pipe. The lower cooling packing is located below the lower cooling water distributor and above the cooling water tank. The upper cooling packing is located above the cooling water receiving tray. The upper cooling water distributor is located above the upper cooling packing. The cooling water receiving tray is located above the lower cooling water distributor. The upper cooling water distributor is connected to the outlet of the condenser heat exchange end of the chiller via a pipe.

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