Data center air conditioning system based on cross-flow solid dehumidification-dew point evaporative cooling

Abstract

The present invention discloses a data center air conditioning system based on cross-flow solid dehumidification and dew-point evaporative cooling. The system includes a dual-bed cross-flow solid dehumidification unit, a dew-point evaporative cooling unit, a heat source unit, and a switching control unit. The heat source unit is connected to the data center room and the dual-bed cross-flow solid dehumidification unit, respectively. The heat source unit recovers waste heat from the hot air in the data center room and further heats the preheated air to meet the regeneration temperature requirement before transmitting it to the dual-bed cross-flow solid dehumidification unit. The dew-point evaporative cooling unit is connected to the data center room and the dual-bed cross-flow solid dehumidification unit, respectively. This system combines cross-flow solid dehumidification with dew-point evaporative cooling technology. The pre-dehumidification process not only enhances the evaporative cooling effect but also helps the system achieve independent control of air temperature and humidity. The effects of adsorption heat can be promptly eliminated, and the heat source unit heats and regenerates the dehumidifier during the desorption and regeneration phase.

Description

Technical Field

[0001] The present invention relates to the technical field of heating, ventilation and air-conditioning equipment, and in particular to a data center air-conditioning system based on cross-flow solid dehumidification-dew point evaporative refrigeration. Background Art

[0002] The rapid development of information technology has driven the ever-increasing scale of data center construction, and the resulting massive energy consumption has garnered unprecedented global attention. Data center energy consumption can be evaluated using Power Usage Effectiveness (PUE), which represents the ratio of total energy consumption to IT equipment energy consumption. The closer the PUE approaches 1, the higher the energy efficiency. Besides the energy consumed to maintain the normal operation of IT equipment, the cooling and air conditioning systems responsible for maintaining the operating environment for IT equipment account for a significant portion of total data center energy consumption, accounting for 30% to 50% of total energy consumption. As the concept of green data centers becomes increasingly popular, the development of sustainable, energy-efficient data center air conditioning technologies has become an inevitable trend.

[0003] To reduce the energy consumption of traditional data center air conditioning systems, increasing the utilization of natural cooling sources and developing and utilizing renewable energy have become among the most effective methods for achieving energy savings in data center air conditioning. Currently, evaporative cooling technology, as a typical method for efficiently utilizing natural cooling sources, has been widely used in data center air conditioning energy-saving retrofits, achieving significant energy savings. It primarily includes direct evaporative cooling, indirect evaporative cooling, and dewpoint evaporative cooling. Theoretically, the limiting temperature for direct and indirect evaporative cooling is the ambient air wet-bulb temperature, while dewpoint evaporative cooling cools the ambient air to the dewpoint, thus offering higher cooling efficiency. However, the cooling capacity of evaporative cooling air conditioning is closely related to the ambient air humidity, resulting in insufficient cooling efficiency in high-humidity climates. To address this issue, employing appropriate dehumidification methods to pre-dehumidify the ambient air, lowering its dew point temperature before passing it through a dewpoint evaporative cooler for evaporative cooling not only enhances cooling efficiency but also, since the dehumidification and cooling steps are performed in separate components, enables independent control of air temperature and humidity, thereby improving the energy efficiency of the air conditioning system. Solid adsorption dehumidification technology, as one of the effective dehumidification technologies that can be driven by low-grade thermal energy such as solar energy, geothermal energy and waste heat from data centers, provides a feasible way to couple with dew point evaporative refrigeration technology.

[0004] In data center air conditioning systems that combine solid adsorption dehumidification with dew-point evaporative cooling, during the adsorption dehumidification phase, the desiccant absorbs water vapor from the ambient air, reducing humidity. This adsorption releases a significant amount of heat, reducing dehumidification capacity. The working air in the dew-point evaporative cooling process is typically colder than the ambient air after passing through the wet channel, so direct discharge would waste cooling capacity. Furthermore, during the desorption regeneration phase, the desiccant requires heat for heating and regeneration. Besides considering renewable thermal energy, the indoor hot air generated by data center operations also offers significant potential for waste heat recovery. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a data center air conditioning system based on cross-flow solid dehumidification-dew point evaporative refrigeration.

[0006] The present invention is achieved through the following technical solutions: a data center air conditioning system based on cross-flow solid dehumidification and dew-point evaporative refrigeration, comprising a dual-bed cross-flow solid dehumidification unit, a dew-point evaporative refrigeration unit, a heat source unit, and a switching control unit; the heat source unit is respectively connected to the data center room and the dual-bed cross-flow solid dehumidification unit, the heat source unit recovers waste heat from the hot air in the data center room and further heats the preheated air to meet the regeneration temperature requirement before transmitting it to the dual-bed cross-flow solid dehumidification unit; the dew-point evaporative refrigeration unit is respectively connected to the data center room and the dual-bed cross-flow solid dehumidification unit;

[0007] The dual-bed cross-flow solid dehumidification unit includes a first cross-flow solid dehumidifier and a second cross-flow solid dehumidifier. The two cross-flow solid dehumidifiers have the same structure. The base of the cross-flow solid dehumidifier is a plate-fin heat exchanger. The air passages of the cross-flow solid dehumidifier include primary flow side channels and secondary flow side channels of the dehumidifier that are distributed in a cross-spaced manner. The primary flow side channels of the dehumidifier are coated or filled with a desiccant material layer, and the secondary flow side channels of the dehumidifier serve as cooling air passages.

[0008] The switching control unit includes a water pump, several three-way valves, and several fans for regulating and controlling the system air volume; the three-way valves are installed in the dual-bed cross-flow solid dehumidification unit and are used to switch between the first cross-flow solid dehumidifier and the second cross-flow solid dehumidifier; the fans are used to control the process air volume, working air volume, and regeneration air volume;

[0009] The dew-point evaporative refrigeration unit includes a cross-flow dew-point evaporative cooler, a water distributor, and a liquid collection tank. The cross-flow dew-point evaporative cooler utilizes a cross-flow plate-fin heat exchanger, comprising a primary flow channel and a secondary flow channel of the cooler, which are arranged in a cross-spaced pattern. The primary flow channel is a dry channel, used to effectively cool the dehumidified air from upstream. The secondary flow channel is a wet channel, in which a portion of the air from the primary flow channel is used as working air and is passed into the secondary flow channel to undergo an evaporative cooling process. The water distributor is located above the secondary flow channel, and the liquid collection tank is located below it. The water distributor and the liquid collection tank are connected via a pipeline and a water pump. The water pump can be used to provide power for the liquid spray circulation in the cross-flow dew-point evaporative cooler.

[0010] The dual-bed cross-flow solid dehumidification unit has a first working state and a second working state; when the first cross-flow solid dehumidifier is in the adsorption dehumidification stage and the second cross-flow solid dehumidifier is in the desorption regeneration stage, it is the first working state; when the first cross-flow solid dehumidifier is in the desorption regeneration stage and the second cross-flow solid dehumidifier is in the adsorption dehumidification stage, it is the second working state; the dual-bed cross-flow solid dehumidification unit can achieve continuous dehumidification by repeatedly switching between the first working state and the second working state through the three-way valve.

[0011] The three-way valve includes a first three-way valve, a second three-way valve and a third three-way valve; the three joints of the first three-way valve are respectively connected to the dehumidifier primary flow side channel outlet of the first cross-flow solid dehumidifier, the dehumidifier primary flow side channel outlet of the second cross-flow solid dehumidifier, and the refrigerator primary flow side channel inlet of the cross-flow dew point evaporative refrigerator; the three joints of the second three-way valve are respectively connected to the dehumidifier secondary flow side channel inlet of the first cross-flow solid dehumidifier, the dehumidifier secondary flow side channel inlet of the second cross-flow solid dehumidifier, and the refrigerator secondary flow side channel outlet of the cross-flow dew point evaporative refrigerator; the three joints of the third three-way valve are respectively connected to the dehumidifier primary flow side channel outlet of the first cross-flow solid dehumidifier, the dehumidifier secondary flow side channel inlet of the second cross-flow solid dehumidifier, and the refrigerator secondary flow side channel outlet of the cross-flow dew point evaporative refrigerator The dehumidifier primary flow side channel outlet of the cross-flow solid dehumidifier and the heat source unit are respectively connected; when the dual-bed cross-flow solid dehumidification unit is in the first working state, the dehumidifier primary flow side channel of the first cross-flow solid dehumidifier is switched through the first three-way valve to connect to the primary flow side channel of the cross-flow dew-point evaporative refrigerator, and the dehumidifier secondary flow side channel of the first cross-flow solid dehumidifier is switched through the second three-way valve to connect to the secondary flow side channel of the cross-flow dew-point evaporative refrigerator; at the same time, the dehumidifier primary flow side channel of the second cross-flow solid dehumidifier is switched through the third three-way valve to connect to the heat source unit, and the dehumidifier secondary flow side channel of the second cross-flow solid dehumidifier is closed due to the switching of the second three-way valve.

[0012] When the dual-bed cross-flow solid dehumidification unit is in the second working state, the dehumidifier primary flow channel of the second cross-flow solid dehumidifier is switched through the first three-way valve to connect to the primary flow channel of the cross-flow dew-point evaporative refrigerator, and the dehumidifier secondary flow channel of the second cross-flow solid dehumidifier is switched through the second three-way valve to connect to the secondary flow channel of the cross-flow dew-point evaporative refrigerator; at the same time, the dehumidifier primary flow channel of the first cross-flow solid dehumidifier is switched through the third three-way valve to connect to the heat source unit, and the dehumidifier secondary flow channel of the first cross-flow solid dehumidifier is closed due to the switching of the second three-way valve.

[0013] During the alternating switching of the working states of the dual-bed cross-flow solid dehumidification unit, the primary flow channel of the cross-flow dew-point evaporative refrigerator can always be connected to the primary flow channel of the dehumidifier of any cross-flow solid dehumidifier in the adsorption dehumidification stage through the switching of the first three-way valve, and the secondary flow channel of the cross-flow dew-point evaporative refrigerator can always be connected to the secondary flow channel of the dehumidifier of any cross-flow solid dehumidifier in the adsorption dehumidification stage through the switching of the second three-way valve.

[0014] The opening above the liquid collecting tank is funnel-shaped, which is conducive to using the collected spray water to liquid-seal the working air in the secondary flow side channel of the refrigerator; the liquid collecting tank is provided with a water replenishment port, which can facilitate timely replenishment of the water consumed by the working air.

[0015] The heat source unit includes an air-to-air heat exchanger and various forms of heat sources. The energy provided by the heat source unit is composed of the waste heat of the hot air in the data center room recovered by the air-to-air heat exchanger and the coupled various forms of heat sources, wherein the various forms of heat sources include renewable heat energy such as solar energy, geothermal energy, equipment waste heat or electric heating.

[0016] The fans include a first fan, a second fan, and a third fan. The first fan is connected to the secondary flow channel of the cross-flow dew-point evaporative cooler, the second fan is connected to the primary flow channel of the cross-flow dew-point evaporative cooler, and the third fan is connected to the air-to-air heat exchanger in the heat source unit. By properly adjusting the frequency of the first and second fans, the volume of processed air and working air can be controlled, thereby achieving regulation of dehumidification and cooling capacity.

[0017] The primary flow channel and the secondary flow channel of the dehumidifier are both provided with corrugated fin structures. The provision of the corrugated fin structures can increase the heat transfer area.

[0018] Compared with the existing technology, the advantages of the present invention are: this system combines cross-flow solid dehumidification with dew-point evaporative cooling technology. The ambient air is pre-dehumidified by the cross-flow solid dehumidification unit, and after the air dew point temperature is reduced, it is passed into the dew-point evaporative cooling unit for evaporative cooling. The pre-dehumidification process not only enhances the evaporative cooling effect, but also helps the system achieve independent control of air temperature and humidity. On the other hand, the exhaust air from the dew-point evaporative cooling unit is used to cool the internal dehumidifier of the adsorption dehumidification stage in the cross-flow solid dehumidification unit, promptly eliminating the effects of adsorption heat. The dehumidifier in the desorption regeneration stage of the cross-flow solid dehumidification unit is heated and regenerated by recycling the waste heat of the indoor hot air in the data center and coupling a heat source unit composed of multiple forms of heat sources. The multiple forms of heat sources include renewable heat energy such as solar energy and geothermal energy, as well as equipment waste heat, which helps to reduce the energy consumption of the air conditioning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of an embodiment of the present invention;

[0020] Figure 2 Schematic diagram of the operation process of the cross-flow solid dehumidifier in the adsorption dehumidification stage according to an embodiment of the present invention;

[0021] Figure 3 Schematic diagram of the operation process of the cross-flow solid dehumidifier in the desorption regeneration stage according to an embodiment of the present invention;

[0022] Figure 4 Schematic diagram of the operation process of the cross-flow dew-point evaporative cooler according to an embodiment of the present invention.

[0023] The meanings of the reference numerals in the figure are: 1. First cross-flow solid dehumidifier; 2. First three-way valve; 3. Cross-flow dew-point evaporative cooler; 4. Water distributor; 5. Water pump; 6. First fan; 7. Second fan; 8. Water supply port; 9. Liquid collecting tank; 10. Data center room; 11. Air-to-air heat exchanger; 12. Third fan; 13. Various forms of heat sources; 14. Third three-way valve; 15. Second cross-flow solid dehumidifier; 16. Second three-way valve; 17. Dehumidifier primary flow side channel; 18. Dehumidifier secondary flow side channel; 19. Refrigerator primary flow side channel; 20. Refrigerator secondary flow side channel. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Example

[0026] See Figure 1 Regarding the connecting pipes between the dual-bed cross-flow solid dehumidification unit and the cross-flow dew-point evaporative cooler 3 and the heat source unit, the solid line area is the air flow direction when the dual-bed cross-flow solid dehumidification unit is in the first working state, and the dotted line area is the air flow direction when the dual-bed cross-flow solid dehumidification unit is in the second working state. Figures 1 to 4 In the code, the meanings of the letter labels are: A stands for treated air (dehumidification), B stands for cooling exhaust (dehumidification), C stands for regeneration exhaust (regeneration), D stands for regeneration air, E stands for indoor exhaust, F stands for dry air, G stands for cooling air, H stands for working exhaust, I stands for working air, and J stands for supply air.

[0027] See Figures 1 to 4, is a data center air conditioning system based on cross-flow solid dehumidification and dew-point evaporative cooling, comprising a dual-bed cross-flow solid dehumidification unit, a dew-point evaporative cooling unit, a heat source unit, and a switching control unit; the heat source unit is connected to the data center room 10 and the dual-bed cross-flow solid dehumidification unit, respectively. The heat source unit recovers waste heat from the hot air in the data center room 10 and further heats the preheated air to meet the regeneration temperature requirement before transmitting it to the dual-bed cross-flow solid dehumidification unit; the dew-point evaporative cooling unit is connected to the data center room 10 and the dual-bed cross-flow solid dehumidification unit, respectively.

[0028] The dual-bed cross-flow solid dehumidification unit includes a first cross-flow solid dehumidifier 1 and a second cross-flow solid dehumidifier 15. The two cross-flow solid dehumidifiers have the same structure, and the base of the cross-flow solid dehumidifier is a plate-fin heat exchanger. The air passages of the first cross-flow solid dehumidifier 1 and the second cross-flow solid dehumidifier 15 include dehumidifier primary flow side channels 17 and dehumidifier secondary flow side channels 18 that are distributed in a cross-spaced manner. The dehumidifier primary flow side channels 17 are coated or filled with a desiccant material layer, and the dehumidifier secondary flow side channels 18 serve as cooling air channels.

[0029] The switching control unit includes a water pump 5, several three-way valves, and several fans for regulating the system air volume. The three-way valves are installed in the dual-bed cross-flow solid dehumidification unit and are used to switch between the first cross-flow solid dehumidifier 1 and the second cross-flow solid dehumidifier 15. The fans are used to control the process air volume, the working air volume, and the regeneration air volume.

[0030] The dew-point evaporative cooling unit includes a cross-flow dew-point evaporative cooler 3, a water distributor 4, and a liquid collection tank 9. The cross-flow dew-point evaporative cooler 3 utilizes a cross-flow plate-fin heat exchanger, comprising primary flow channels 19 and secondary flow channels 20 arranged in a cross-spaced pattern. The primary flow channels 19 are dry channels, effectively cooling the dehumidified air upstream. The secondary flow channels 20 are wet channels, with some of the air from the primary flow channels 19 used as working air and passing into the secondary flow channels 20 for evaporative cooling. The water distributor 4 is located above the secondary flow channels 20, and the liquid collection tank 9 is located below it. The water distributor 4 and the liquid collection tank 9 are connected by piping and a water pump 5. The water pump 5 is provided to power the liquid spray circulation in the cross-flow dew-point evaporative cooler 3.

[0031] In this embodiment, the plate-fin heat exchanger structure is based on existing technology. Plate-fin heat exchangers typically consist of baffles, fins, seals, and guide vanes. Fins, guide vanes, and seals are placed between adjacent baffles to form a sandwich, called a channel. These sandwiches are stacked according to the flow pattern of the fluid and brazed together to form a plate bundle, the core of the plate-fin heat exchanger. Plate-fin heat exchangers are widely used in industries such as petroleum, chemical processing, and natural gas processing. Therefore, a detailed analysis of the specific structure of a plate-fin heat exchanger is unnecessary.

[0032] The dual-bed cross-flow solid dehumidification unit has a first working state and a second working state; when the first cross-flow solid dehumidifier 1 is in the adsorption dehumidification stage and the second cross-flow solid dehumidifier 15 is in the desorption regeneration stage, it is the first working state; when the first cross-flow solid dehumidifier 1 is in the desorption regeneration stage and the second cross-flow solid dehumidifier 15 is in the adsorption dehumidification stage, it is the second working state; the dual-bed cross-flow solid dehumidification unit repeatedly switches between the first working state and the second working state through a three-way valve to achieve continuous dehumidification.

[0033] The three-way valve includes a first three-way valve 2, a second three-way valve 16 and a third three-way valve 14; the three joints of the first three-way valve 2 are respectively connected to the outlet of the dehumidifier primary flow side channel 17 of the first cross-flow solid dehumidifier 1, the outlet of the dehumidifier primary flow side channel 17 of the second cross-flow solid dehumidifier 15, and the inlet of the refrigerator primary flow side channel 19 of the cross-flow dew point evaporative refrigerator 3; the three joints of the second three-way valve 16 are respectively connected to the inlet of the dehumidifier secondary flow side channel 18 of the first cross-flow solid dehumidifier 1, the inlet of the dehumidifier secondary flow side channel 18 of the second cross-flow solid dehumidifier 15, and the outlet of the refrigerator secondary flow side channel 20 of the cross-flow dew point evaporative refrigerator 3; the three joints of the third three-way valve 14 are respectively connected to the outlet of the dehumidifier primary flow side channel 17 of the first cross-flow solid dehumidifier 1, the outlet of the dehumidifier primary flow side channel 19 of the second cross-flow solid dehumidifier 15 The outlet of the dehumidifier primary flow side channel 17 of the cross-flow solid dehumidifier 15 and the heat source unit are connected respectively; when the dual-bed cross-flow solid dehumidification unit is in the first working state, the dehumidifier primary flow side channel 17 of the first cross-flow solid dehumidifier 1 is switched through the first three-way valve 2 to connect to the primary flow side channel 19 of the cross-flow dew point evaporative refrigerator 3, and the dehumidifier secondary flow side channel 18 of the first cross-flow solid dehumidifier 1 is switched through the second three-way valve 16 to connect to the secondary flow side channel 20 of the cross-flow dew point evaporative refrigerator 3; at the same time, the dehumidifier primary flow side channel 17 of the second cross-flow solid dehumidifier 15 is switched through the third three-way valve 14 to connect to the heat source unit, and the dehumidifier secondary flow side channel 18 of the second cross-flow solid dehumidifier 15 is closed due to the switching of the second three-way valve 16.

[0034] When the dual-bed cross-flow solid dehumidification unit is in the second working state, the dehumidifier primary flow channel of the second cross-flow solid dehumidifier 15 is switched to the primary flow channel of the refrigerator connected to the cross-flow dew-point evaporative refrigerator 3 through the first three-way valve 2, and the dehumidifier secondary flow channel of the second cross-flow solid dehumidifier 15 is switched to the secondary flow channel of the refrigerator connected to the cross-flow dew-point evaporative refrigerator 3 through the second three-way valve 16; at the same time, the dehumidifier primary flow channel of the first cross-flow solid dehumidifier 1 is switched to the heat source unit through the third three-way valve 14, and the dehumidifier secondary flow channel of the first cross-flow solid dehumidifier 1 is closed due to the switching of the second three-way valve 16.

[0035] During the alternating switching of the working states of the dual-bed cross-flow solid dehumidification units, the primary flow channel of the cross-flow dew-point evaporative refrigerator 3 can always be connected to the primary flow channel of the dehumidifier of any cross-flow solid dehumidifier in the adsorption dehumidification stage through the switching of the first three-way valve 2, and the secondary flow channel of the cross-flow dew-point evaporative refrigerator 3 can always be connected to the secondary flow channel of the dehumidifier of any cross-flow solid dehumidifier in the adsorption dehumidification stage through the switching of the second three-way valve 16.

[0036] The opening above the liquid collecting tank 9 is funnel-shaped, which is conducive to using the collected spray water to liquid-seal the working air in the secondary flow side channel 20 of the refrigerator; the liquid collecting tank 9 is provided with a water replenishment port 8, which can facilitate timely replenishment of the water consumed by the working air.

[0037] The heat source unit includes an air-to-air heat exchanger 11 and a plurality of heat sources 13. The energy provided by the heat source unit is composed of the waste heat of the hot air in the data center room 10 recovered by the air-to-air heat exchanger 11 and the coupled plurality of heat sources 13. The plurality of heat sources 13 include renewable heat energy such as solar energy and geothermal energy, equipment waste heat or electric heating.

[0038] The fans include a first fan 6, a second fan 7, and a third fan 12. The first fan 6 is connected to the secondary flow channel 20 of the cross-flow dew-point evaporative cooler 3, the second fan 7 is connected to the primary flow channel 19 of the cross-flow dew-point evaporative cooler 3, and the third fan 12 is connected to the heat source unit. By properly adjusting the frequency of the first fan 6 and the second fan 7, the volume of processed air and working air can be controlled, thereby achieving regulation of dehumidification and cooling capacity. The third fan 12 is used to introduce outdoor air to recover waste heat from the indoor hot air from the data center room 10 in the air-to-air heat exchanger 11 of the heat source unit. The indoor air is exhausted after heat exchange and discharged outside the system. The outdoor preheated air is then introduced into the heat source through the third fan 12 and further heated to meet the regeneration temperature requirements before being transmitted to the dual-bed cross-flow solid dehumidification unit.

[0039] Corrugated fin structures are provided in the primary flow side channel 17 of the dehumidifier and in the secondary flow side channel 18 of the dehumidifier. The provision of the corrugated fin structure can increase the heat transfer area.

[0040] The above detailed description is a specific description of a feasible embodiment of the present invention. The embodiment is not intended to limit the patent scope of the present invention. Any equivalent implementation or modification that does not depart from the present invention should be included in the patent scope of this case.

Claims

1. A data center air conditioning system based on cross-flow solid dehumidification and dew point evaporative cooling, characterized by: It includes a dual-bed cross-flow solid dehumidification unit, a dew-point evaporative refrigeration unit, a heat source unit and a switching control unit; the heat source unit is connected to the data center room and the dual-bed cross-flow solid dehumidification unit respectively, the heat source unit recovers waste heat from the hot air in the data center room and further heats the preheated air to meet the regeneration temperature requirement before transmitting it to the dual-bed cross-flow solid dehumidification unit; the dew-point evaporative refrigeration unit is connected to the data center room and the dual-bed cross-flow solid dehumidification unit respectively; The dual-bed cross-flow solid dehumidification unit includes a first cross-flow solid dehumidifier and a second cross-flow solid dehumidifier. The two cross-flow solid dehumidifiers have the same structure. The base of the cross-flow solid dehumidifier is a plate-fin heat exchanger. The air passages of the cross-flow solid dehumidifier include primary flow side channels and secondary flow side channels of the dehumidifier that are distributed in a cross-spaced manner. The primary flow side channels of the dehumidifier are coated or filled with a desiccant material layer, and the secondary flow side channels of the dehumidifier serve as cooling air passages. The switching control unit includes a water pump, a plurality of three-way valves and a plurality of fans for adjusting and controlling the air volume of the system; the three-way valve is installed in the dual-bed cross-flow solid dehumidification unit and is used to switch between the first cross-flow solid dehumidifier and the second cross-flow solid dehumidifier; The dew-point evaporative refrigeration unit includes a cross-flow dew-point evaporative refrigerator, a water distributor and a liquid collecting tank; the cross-flow dew-point evaporative refrigerator adopts a cross-flow plate-fin heat exchanger, including a primary flow side channel of the refrigerator and a secondary flow side channel of the refrigerator distributed at cross intervals; the primary flow side channel of the refrigerator is a dry channel, which is used to effectively cool the treated air after upstream dehumidification; the secondary flow side channel of the refrigerator is a wet channel, in which part of the air from the primary flow side channel of the refrigerator is used as working air to pass into the secondary flow side channel of the refrigerator to undergo an evaporative refrigeration process; the water distributor is provided above the secondary flow side channel of the refrigerator, and the liquid collecting tank is provided below it, and the water distributor and the liquid collecting tank are connected through a pipeline and the water pump; The dual-bed cross-flow solid dehumidification unit has a first working state and a second working state; when the first cross-flow solid dehumidifier is in the adsorption dehumidification stage and the second cross-flow solid dehumidifier is in the desorption regeneration stage, it is the first working state; when the first cross-flow solid dehumidifier is in the desorption regeneration stage and the second cross-flow solid dehumidifier is in the adsorption dehumidification stage, it is the second working state; the dual-bed cross-flow solid dehumidification unit repeatedly switches between the first working state and the second working state through the three-way valve; The three-way valve includes a first three-way valve, a second three-way valve and a third three-way valve; the three joints of the first three-way valve are respectively connected to the dehumidifier primary flow side channel outlet of the first cross-flow solid dehumidifier, the dehumidifier primary flow side channel outlet of the second cross-flow solid dehumidifier, and the refrigerator primary flow side channel inlet of the cross-flow dew point evaporative refrigerator; the three joints of the second three-way valve are respectively connected to the dehumidifier secondary flow side channel inlet of the first cross-flow solid dehumidifier, the dehumidifier secondary flow side channel inlet of the second cross-flow solid dehumidifier, and the refrigerator secondary flow side channel outlet of the cross-flow dew point evaporative refrigerator; the three joints of the third three-way valve are respectively connected to the dehumidifier primary flow side channel outlet of the first cross-flow solid dehumidifier, the dehumidifier secondary flow side channel inlet of the second cross-flow solid dehumidifier, and the refrigerator secondary flow side channel outlet of the cross-flow dew point evaporative refrigerator The dehumidifier primary flow side channel outlet of the cross-flow solid dehumidifier and the heat source unit are respectively connected; when the dual-bed cross-flow solid dehumidification unit is in the first working state, the dehumidifier primary flow side channel of the first cross-flow solid dehumidifier is switched through the first three-way valve to connect to the primary flow side channel of the cross-flow dew-point evaporative refrigerator, and the dehumidifier secondary flow side channel of the first cross-flow solid dehumidifier is switched through the second three-way valve to connect to the secondary flow side channel of the cross-flow dew-point evaporative refrigerator; at the same time, the dehumidifier primary flow side channel of the second cross-flow solid dehumidifier is switched through the third three-way valve to connect to the heat source unit, and the dehumidifier secondary flow side channel of the second cross-flow solid dehumidifier is closed due to the switching of the second three-way valve.

2. The data center air conditioning system based on cross-flow solid dehumidification and dew point evaporative cooling according to claim 1 is characterized in that: When the dual-bed cross-flow solid dehumidification unit is in the second working state, the dehumidifier primary flow channel of the second cross-flow solid dehumidifier is switched through the first three-way valve to connect to the primary flow channel of the cross-flow dew-point evaporative refrigerator, and the dehumidifier secondary flow channel of the second cross-flow solid dehumidifier is switched through the second three-way valve to connect to the secondary flow channel of the cross-flow dew-point evaporative refrigerator; at the same time, the dehumidifier primary flow channel of the first cross-flow solid dehumidifier is switched through the third three-way valve to connect to the heat source unit, and the dehumidifier secondary flow channel of the first cross-flow solid dehumidifier is closed due to the switching of the second three-way valve.

3. The data center air conditioning system based on cross-flow solid dehumidification and dew point evaporative cooling according to claim 2 is characterized in that: During the alternating switching of the working states of the dual-bed cross-flow solid dehumidification unit, the primary flow channel of the cross-flow dew-point evaporative refrigerator can always be connected to the primary flow channel of the dehumidifier of any cross-flow solid dehumidifier in the adsorption dehumidification stage through the switching of the first three-way valve, and the secondary flow channel of the cross-flow dew-point evaporative refrigerator can always be connected to the secondary flow channel of the dehumidifier of any cross-flow solid dehumidifier in the adsorption dehumidification stage through the switching of the second three-way valve.

4. The data center air conditioning system based on cross-flow solid dehumidification and dew point evaporative cooling according to claim 1 is characterized in that: The upper opening of the liquid collecting tank is funnel-shaped; the liquid collecting tank is provided with a water replenishing port.

5. The data center air conditioning system based on cross-flow solid dehumidification and dew point evaporative cooling according to claim 1 is characterized in that: The heat source unit includes an air-to-air heat exchanger and various forms of heat sources. The energy provided by the heat source unit includes the waste heat of hot air in the data center room recovered by the air-to-air heat exchanger and the coupled various forms of heat sources, wherein the various forms of heat sources include solar energy, geothermal energy, equipment waste heat or electric heating.

6. The data center air conditioning system based on cross-flow solid dehumidification and dew point evaporative cooling according to claim 1, characterized in that: The fan includes a first fan, a second fan and a third fan. The first fan is connected to the secondary flow side channel of the refrigerator of the cross-flow dew-point evaporative refrigerator, the second fan is connected to the primary flow side channel of the refrigerator of the cross-flow dew-point evaporative refrigerator, and the third fan is connected to the air-to-air heat exchanger in the heat source unit.

7. The data center air conditioning system based on cross-flow solid dehumidification and dew point evaporative cooling according to claim 1, characterized in that: A corrugated fin structure is provided in the primary flow side channel of the dehumidifier and in the secondary flow side channel of the dehumidifier.

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