A waste heat recovery indirect evaporative cooling system suitable for high humidity areas

Abstract

This invention discloses a waste heat recovery indirect evaporative cooling system suitable for high humidity areas, comprising a primary evaporator, a rotor connected to one side of the primary evaporator, the rotor including a rotor processing zone and a rotor regeneration zone, the primary evaporator being connected to the rotor processing zone, a gas-to-gas heat exchanger connected to one side of the rotor processing zone, a secondary evaporator connected to one side of the gas-to-gas heat exchanger, the secondary evaporator being connected to the indirect evaporative cooler, a secondary cooling capacity application device connected to one side of the indirect evaporative cooler, the secondary cooling capacity application device being connected between the secondary evaporator and the indirect evaporative cooler, a condenser connected to one side of the gas-to-gas heat exchanger, the condenser being connected to the rotor regeneration zone, and an indoor medium circulation heat dissipation system connected to one side of the indirect evaporative cooler.

Description

Technical Field

[0001] This invention relates to the field of refrigeration and air conditioning system technology, specifically a waste heat recovery indirect evaporative cooling system suitable for high humidity areas. Background Technology

[0002] The promotion and application of indirect evaporative cooling technology in high-humidity areas has long faced technical bottlenecks due to climatic constraints. The core contradiction lies in the fact that the energy-saving efficiency of this technology relies on the strong heat absorption capacity of dry air through evaporation, while high humidity weakens the foundation of this physical process. Specifically, the theoretical cooling limit of indirect evaporative cooling is the wet-bulb temperature of the air. However, in areas with persistently high annual average relative humidity, the difference between the wet-bulb and dry-bulb temperatures of outdoor air is small. This means that the system's cooling potential and driving temperature difference are low, failing to meet the continuous and stable cooling demands of scenarios such as data centers. Therefore, traditional indirect evaporative cooling systems alone are inefficient and cannot operate independently in such areas.

[0003] Data centers, due to their energy efficiency requirements, are one of the most suitable scenarios for indirect evaporative cooling systems. Data centers house servers, communication equipment, and other devices, requiring uninterrupted cooling throughout the year to ensure their normal operation. With the rise of artificial intelligence, big data computing, and cloud computing, the scale, number, and chip power of data centers are increasing year by year, leading to a continuous surge in the scale and energy consumption of global data centers. Cooling systems account for approximately 30% to 40% of the total energy consumption of data centers, making them crucial for reducing overall data center operating costs.

[0004] Currently, older small and medium-sized data centers still rely on mechanical refrigeration for cooling, with a PUE of around 1.5. Newly built medium and large data centers, on the other hand, mostly use chiller units for cooling, with a PUE between 1.3 and 1.5. To further conserve energy, in arid northern regions, evaporative cooling systems are often used to introduce natural cooling sources. This method can significantly reduce the energy consumption of the cooling system, typically stabilizing the PUE at around 1.2. However, in southern regions with high humidity, the high wet-bulb temperature prevents the extensive use of evaporative cooling systems to obtain free cooling, necessitating the use of chiller units for supplemental cooling.

[0005] In existing technologies, there are schemes that couple dehumidifying rotors with evaporative cooling systems. For example, Chinese patent CN219514484U discloses an air conditioning system that uses a dehumidifying rotor to dehumidify outdoor air before sending it into the evaporative cooling system, and uses an air source heat pump to recover waste heat from indoor return air to assist in electric heating for rotor regeneration. However, this system still has shortcomings: the outdoor air enters the dehumidifying rotor directly without pre-cooling, resulting in an increase in air temperature after dehumidification and increasing the subsequent cooling load; its regeneration heat source mainly relies on waste heat from indoor return air and electric heating, resulting in high energy consumption; and it does not deeply regulate the wet-bulb temperature of the air entering the evaporative cooling system, limiting the improvement in cooling efficiency.

[0006] To enable wider application of indirect evaporative cooling systems in high-humidity areas, reducing the wet-bulb temperature of the processed air with low energy consumption is crucial. If condensation dehumidification is used to pre-cool the processed air, additional cooling capacity is required, significantly increasing system energy consumption. If a dehumidification rotor is used directly for dehumidification via solid adsorption, additional regeneration heat is needed for the regeneration of the solid adsorbent, again increasing energy consumption. While existing technologies propose coupling the rotor and evaporative cooling system, employing multi-stage heat exchangers for cascaded energy utilization, the system structure is complex, limiting its development potential. Furthermore, heat recovery in data center rooms is often inefficient due to low energy grade, hindering its effective utilization.

[0007] In summary, existing indirect evaporative cooling systems have the following shortcomings: 1. Low applicability to medium and high humidity areas; 2. In medium and high humidity areas, a large amount of cooling capacity needs to be supplemented by a chiller unit, resulting in high energy consumption; 3. Complex coupling with the dehumidification impeller, leading to increased energy consumption due to the impeller; 4. Inability to effectively recover indoor heat. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a waste heat recovery indirect evaporative cooling system suitable for high humidity areas, which can improve the operating efficiency of indirect evaporative cooling systems in medium and high humidity areas, reduce the energy consumption of dehumidification rotor regeneration, and effectively recover indoor waste heat.

[0009] This invention is achieved through the following technical solution: A waste heat recovery indirect evaporative cooling system suitable for high-humidity areas includes a primary evaporator. A rotor is connected to one side of the primary evaporator. The rotor includes a processing zone and a regeneration zone. The primary evaporator is connected to the processing zone. A gas-to-gas heat exchanger is connected to one side of the processing zone. A secondary evaporator is connected to one side of the gas-to-gas heat exchanger. The secondary evaporator is connected to the indirect evaporative cooler. A secondary cooling capacity application device is also connected to one side of the indirect evaporative cooler. Between the primary evaporator and the indirect evaporative cooler, a condenser is connected to one side of the gas-to-gas heat exchanger. The condenser is connected to the rotary regeneration zone. An indoor medium circulation heat dissipation system is connected to one side of the indirect evaporative cooler. The indoor medium circulation heat dissipation system includes a first medium circulation system consisting of an indirect evaporative cooler, an outdoor circulating pump, and a CDU heat exchanger connected to each other. A second medium circulation system consists of the CDU heat exchanger, a gas-liquid heat exchanger, an indoor circulating water pump, and a data center environmental heat recovery device connected to each other. The first medium circulation system and the second medium circulation system exchange heat to achieve the cooling function.

[0010] In a further technical solution, the data center environmental heat recovery device is arranged in the data center, and the data center environmental heat recovery device is connected to the gas-liquid heat exchanger and the indoor circulating water pump respectively.

[0011] In a further technical solution, after the outdoor circulation pump is working, it circulates the medium of the first medium circulation system, with the flow direction being in the order of indirect evaporative cooler, CDU heat exchanger and outdoor circulation pump.

[0012] In a further technical solution, after the indoor circulating water pump is working, the medium of the second medium circulation system is circulated, and the flow direction is sequentially the data center environmental heat recovery device, the gas-liquid heat exchanger, the CDU heat exchanger and the indoor circulating water pump.

[0013] A summer operating method for a waste heat recovery indirect evaporative cooling system suitable for high humidity areas is as follows: The primary evaporator, rotary processing zone, gas-to-gas heat exchanger, secondary evaporator, indirect evaporative cooler, and secondary application device for cooling capacity form a fresh air dehumidification and cooling channel; the gas-to-gas heat exchanger, condenser, and rotary regeneration zone form a fresh air dehydration channel; the gas-liquid heat exchanger is closed, and the gas-to-gas heat exchanger is opened. For the fresh air path: the fresh air is cooled by the first-stage evaporator, and then enters the rotary processing area to reduce the moisture content and increase the temperature through an isenthalpic process. It is then further cooled by the gas-to-gas heat exchanger, and then further cooled by the second-stage evaporator. After that, it is mixed with the treated low-temperature gas through the cold energy secondary application device to form a low wet-bulb temperature gas, which enters the indirect evaporative cooler. The indirect evaporative cooler produces primary air and exchanges cold energy with the heat exchange material to cool the hot water input by the outdoor circulation pump. The secondary air is mixed with the treated air through the cold energy secondary application device. The regenerated air path involves: fresh air being preheated by exchanging heat with the higher-temperature gas at the rotor outlet through a gas-to-gas heat exchanger, and then further heated by a condenser before being sent to the rotor regeneration zone. The regenerated gas regenerates the moisture-absorbing material in the regeneration zone for continued moisture absorption. Specifically, for the indoor medium circulation heat dissipation system: the heat generated indoors and by the chip is recovered by the data center environmental heat recovery device. The hot water is cooled by exchanging heat with the cold water prepared by the CDU heat exchanger and the indirect evaporative cooler. Then, the cold energy is distributed through the cold energy distribution path of the CDU heat exchanger and sent back to the data center environmental heat recovery device after passing through the indoor circulating water pump.

[0014] The operating method of a waste heat recovery indirect evaporative cooling system suitable for high humidity areas during the transition season is as follows: disconnect the gas-to-gas heat exchanger from the condenser and the secondary evaporator, then directly connect the gas-to-gas heat exchanger to the indirect evaporative cooler, disconnect the secondary application device of cooling capacity from the secondary evaporator and the indirect evaporative cooler, and connect the fresh air to the rotor regeneration zone after passing through the gas-liquid heat exchanger to form a rotor dehydration channel. The gas-liquid heat exchanger and the gas-to-gas heat exchanger are turned on. For the fresh air path: Fresh air directly enters the rotary processing area, undergoes an isenthalpic process to be dehumidified and heated, and then passes through an air-to-air heat exchanger to be cooled by outdoor air to reduce its temperature. After that, it is directly sent to the indirect evaporative cooler. The indirect evaporative cooler generates primary air and exchanges cold energy with the heat exchange material to cool the hot water input by the outdoor circulation pump.

[0015] Specifically, regarding the regenerated air path: fresh air first exchanges heat with the heat recovered indoors through a gas-liquid heat exchanger, recovering some of the indoor heat, and then is directly sent to the rotary regeneration zone for low-temperature regeneration; through low-temperature regeneration, the moisture-absorbing material in the regeneration zone is regenerated for subsequent continued moisture absorption.

[0016] Specifically, for the indoor medium circulation heat dissipation system: the heat generated indoors and by the chip is recovered by the data center environmental heat recovery device. The hot water first passes through the gas-liquid heat exchanger to remove some of the heat, and then exchanges heat with the cold water prepared by the CDU heat exchanger and the indirect evaporative cooler to be cooled. After that, the cold energy is distributed through the cold energy distribution path of the CDU heat exchanger, and then sent back to the data center environmental heat recovery device after passing through the indoor circulating water pump.

[0017] The beneficial effects of this invention are as follows: First, during summer operation, the fresh air undergoes multi-stage pre-cooling via a primary evaporator, dehumidification in the rotary processing zone, gas-to-gas heat exchanger, secondary evaporator, and secondary application of cooling capacity. The fresh air also undergoes multi-stage preheating via a gas-to-gas heat exchanger and condenser, and the increased temperature is used to dehumidify the rotary processing zone. Indoor heat is transferred to the indirect evaporative cooler via the CDU heat exchanger. In summer, the gas-liquid heat exchanger is shut down, and the gas-to-gas heat exchanger is used. The heat pump is started, and the condenser heating is utilized to meet the system's heating and cooling requirements and airflow demands.

[0018] Second, during the transition season, fresh air undergoes multi-stage preheating through the gas-liquid heat exchanger and condenser, and the heated air is used to dehumidify the rotary processing area. Indoor heat is supplied to the rotary processing area through the gas-liquid heat exchanger, and then transferred to the indirect evaporative cooler through the CDU heat exchanger, realizing the function of cascaded heat transfer. During the transition season, the gas-liquid heat exchanger is started, the gas-gas heat exchanger is started, and the heat pump is turned off, and the energy is utilized in a cascaded manner by actively recovering cold and heat.

[0019] 3. The rotary regeneration zone is located downstream of the rotary processing zone. It uses the heat discharged from the condenser to regenerate the desiccant and restore its dehumidification capacity. The gas-to-gas heat exchanger is used to recover the heat of the air at the outlet of the processing zone, preheat the fresh air, and cool the processed air.

[0020] IV. The advantages of the system are: using a primary evaporator, a secondary evaporator, an air-to-air heat exchanger, and a secondary cooling capacity application device to perform gradient cooling of the treated air in order to reduce the wet-bulb temperature of the fresh air.

[0021] The operating efficiency of the indirect evaporative cooler can be improved and more cooling capacity can be produced by using a lower wet-bulb temperature.

[0022] Equipped with a secondary cold energy utilization device, the processed cold energy is mixed with the processed air to further reduce the wet-bulb temperature, producing chilled water with a temperature lower than the original wet-bulb temperature of the processed air.

[0023] By improving the quality of waste heat in the data center through a liquid cooling system and utilizing a heat pump system to recover waste heat for dehumidification rotor regeneration, the energy consumption of dehumidification rotor regeneration is reduced. Simultaneously, secondary air passing through the indirect evaporative cooler is recovered by a secondary cooling application device and remixed with processed air, improving evaporative cooling efficiency and producing chilled water and low-temperature primary air below the wet-bulb temperature of ambient air. This method can improve the operating efficiency of the indirect evaporative cooling system and reduce the limitations of its use in medium-to-high humidity areas. Furthermore, with proper system configuration and different system modes for different seasonal operating conditions, the lifespan of the free cooling source can be significantly extended, contributing to a further reduction in the overall PUE (Power Usage Effectiveness) of the data center (PUE). Moreover, this invention features a simple system setup, high energy cascade utilization, modular design, and strong engineering applicability. Attached Figure Description

[0024] For ease of explanation, the present invention will be described in detail below with reference to specific embodiments and accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the structure of a waste heat recovery indirect evaporative cooling system suitable for high humidity areas under summer operating conditions according to the present invention; Figure 2 This is a schematic diagram of the structure of a waste heat recovery indirect evaporative cooling system suitable for high humidity areas under transitional season conditions according to the present invention. Figure 3 This is a comprehensive PUE diagram of the system of the present invention under summer operating conditions; In the diagram, the components are: 1. Primary evaporator; 2. Rotary wheel processing zone; 3. Rotary wheel regeneration zone; 4. Condenser; 5. Gas-to-gas heat exchanger; 6. Secondary evaporator; 7. Indirect evaporative cooler; 8. Outdoor circulating water pump; 9. CDU heat exchanger; 10. Gas-liquid heat exchanger; 11. Indoor circulating water pump; 12. Data center environmental heat recovery device; 13. Secondary application device for cooling capacity. Detailed Implementation

[0026] like Figures 1-3 As shown, the present invention will be described in detail. For ease of description, the directions mentioned below are defined as follows: the directions of up, down, left, right, front, and back mentioned below are the same as... Figure 1 The directions of the projection relationship are consistent in all directions: up, down, left, right, front, and back.

[0027] Example 1: An indoor medium circulation heat dissipation system of the present invention includes an indirect evaporative cooler 7, an outdoor circulation pump 8, a CDU heat exchanger 9, a gas-liquid heat exchanger 10, an indoor circulating water pump 11, and a data center environmental heat recovery device 12. The indirect evaporative cooler 7, the outdoor circulation pump 8, and the CDU heat exchanger 9 are interconnected to form a first medium circulation system. The CDU heat exchanger 9, the gas-liquid heat exchanger 10, the indoor circulating water pump 11, and the data center environmental heat recovery device 12 are interconnected to form a second medium circulation system. The CDU heat exchanger 9 exchanges heat between the low-temperature medium of the first medium circulation system and the high-temperature medium of the second medium circulation system to reduce the high-temperature medium in the second medium circulation system, thereby achieving the cooling function.

[0028] Advantageously, the indirect evaporative cooler 7, the outdoor circulating pump 8 and the CDU heat exchanger 9 are connected by pipelines, and the CDU heat exchanger 9, the gas-liquid heat exchanger 10, the indoor circulating water pump 11 and the data center environmental heat recovery device 12 are also connected by pipelines.

[0029] Advantageously, the data center environmental heat recovery device 12 is arranged in the data center, and the data center environmental heat recovery device 12 is connected to the gas-liquid heat exchanger 10 and the indoor circulating water pump 11 respectively.

[0030] After the outdoor circulating pump 8 starts working, it circulates the medium of the first medium circulation system, with the flow direction being in the order of indirect evaporative cooler 7, CDU heat exchanger 9 and outdoor circulating pump 8.

[0031] After the indoor circulating water pump 11 is working, it circulates the medium of the second medium circulation system. The flow direction is sequentially from the data center environmental heat recovery device 12, the gas-liquid heat exchanger 10, the CDU heat exchanger 9, and the indoor circulating water pump 11.

[0032] The second medium circulation system recovers heat from the data center and exchanges heat with the first medium circulation system at the CDU heat exchanger 9, transferring the heat to the first medium circulation system. The first medium circulation system then removes the heat through the indirect evaporative cooler 7, thus achieving the cooling function.

[0033] The medium can be water, coolant, or other liquid cooling media. In low-temperature conditions such as winter, the medium can be replaced with ethylene glycol to prevent the pipeline from freezing.

[0034] Example 2, based on Example 1, further defines the following: A system for cooling an indoor medium circulation heat dissipation system during transitional season conditions, including a primary evaporator 1, a rotor connected to one side of the primary evaporator 1, the rotor including a rotor processing zone 2 and a rotor regeneration zone 3, a gas-to-gas heat exchanger 5 connected to one side of the rotor processing zone 2, the gas-to-gas heat exchanger 5 being connected to the indirect evaporative cooler 7, and fresh air being connected to the rotor regeneration zone 3 after passing through the gas-liquid heat exchanger 10.

[0035] During the transitional season, the gas-liquid heat exchanger 10 and the gas-gas heat exchanger 5 are started to meet the system's cooling and heating matching and air volume requirements.

[0036] The system uses a fan to drive airflow and a water pump to circulate water.

[0037] For the fresh air path: the fresh air directly enters the rotary processing area 2, is dehumidified and heated through the isenthalpic process, and then is cooled by the outdoor air through the air-to-air heat exchanger 5. After that, it is directly sent to the indirect evaporative cooler 7. The indirect evaporative cooler 7 generates primary air and exchanges cold energy with the heat exchange material to cool the hot water input by the outdoor circulation pump 8.

[0038] Specifically, regarding the regenerated air path: fresh air first exchanges heat with the heat recovered indoors through the gas-liquid heat exchanger 10, recovering a portion of the indoor heat, and then directly sends it into the rotary regeneration zone 3 for low-temperature regeneration. Through low-temperature regeneration, the moisture-absorbing material in the regeneration zone is regenerated for continued moisture absorption.

[0039] In the indoor medium circulation heat dissipation system: the heat generated indoors and by the chip is recovered by the data center environmental heat recovery device 12. The hot water first passes through the gas-liquid heat exchanger 10 to remove some of the heat. Then, it exchanges heat with the cold water prepared by the CDU heat exchanger 9 and the indirect evaporative cooler 7 to cool down. After that, the cold energy is distributed through the cold energy distribution path of the CDU heat exchanger 9 and then sent back to the data center environmental heat recovery device 12 after passing through the indoor circulating water pump 11.

[0040] Example 3, based on Example 1, further defines the following: A system for cooling an indoor medium circulation heat dissipation system during summer operation, comprising a primary evaporator 1, a rotor connected to one side of the primary evaporator 1, the rotor including a rotor processing area 2 and a rotor regeneration area 3, the primary evaporator 1 being connected to the rotor processing area 2, a gas-to-gas heat exchanger 5 connected to one side of the rotor processing area 2, a secondary evaporator 6 connected to one side of the gas-to-gas heat exchanger 5, the secondary evaporator 6 being connected to an indirect evaporative cooler 7, a secondary cooling capacity application device 13 connected to one side of the indirect evaporative cooler 7, the secondary cooling capacity application device 13 being connected between the secondary evaporator 6 and the indirect evaporative cooler 7, a condenser 4 connected to one side of the gas-to-gas heat exchanger 5, and the condenser 4 being connected to the rotor regeneration area 3.

[0041] The system uses a fan to drive airflow and a water pump to circulate water.

[0042] During summer operation, the gas-liquid heat exchanger 10 is shut down, and the gas-to-gas heat exchanger 5 is used to meet the system's cooling and heating requirements and air volume requirements.

[0043] The fresh air path is as follows: the fresh air is cooled by the primary evaporator 1, and then enters the rotary processing zone 2 to reduce the moisture content and increase the temperature through an isenthalpic process. It is then further cooled by the gas-to-gas heat exchanger 5, and then further cooled by the secondary evaporator 6. After that, it is mixed with the treated low-temperature gas through the secondary cold energy application device 13 to form a low wet-bulb temperature gas, which enters the indirect evaporative cooler 7. The indirect evaporative cooler 7 produces primary air and exchanges cold energy with the heat exchange material to cool the hot water input by the outdoor circulation pump 8. The secondary air is mixed with the treated air through the secondary cold energy application device 13.

[0044] The regeneration air path is as follows: fresh air is preheated by exchanging heat with the higher-temperature gas at the rotor outlet through the gas-to-gas heat exchanger 5, and then further heated by the condenser 4 before being sent to the rotor regeneration zone 3. The regeneration gas regenerates the moisture-absorbing material in the regeneration zone for continued moisture absorption.

[0045] In the indoor medium circulation heat dissipation system: the heat generated indoors and by the chip is recovered by the data center environmental heat recovery device 12. The hot water is cooled by exchanging heat with the cold water prepared by the CDU heat exchanger 9 and the indirect evaporative cooler 7. Then, the cold energy is distributed through the cold energy distribution path of the CDU heat exchanger 9 and sent back to the data center environmental heat recovery device 12 after passing through the indoor circulating water pump 11.

[0046] A heat pump includes at least a primary evaporator 1, a secondary evaporator 6, and a condenser 4.

[0047] Example 4, based on Example 2 or 3, further defines the following: The system control logic is as follows, in summer: The system's cooling and heating capacity is controlled by adjusting the evaporation and condensation temperatures, while simultaneously controlling the wet-bulb temperature at the inlet of the indirect evaporative cooler 7.

[0048] When the system detects that the indoor liquid cooling temperature is too high, it increases the opening degree of the indirect evaporative cooler 7 and the condenser 4 to produce more cooling capacity, transfer more heat, improve the pre-cooling effect, increase the regeneration temperature, and improve the dehumidification effect of the rotary dehumidifier, thereby reducing the wet-bulb temperature of the air at the inlet of the indirect evaporative cooler 7, reducing the temperature of the prepared chilled water, and reducing the liquid cooling return water temperature to the set value.

[0049] When the system detects that the indoor liquid cooling temperature is lower than the standard value, it reduces the opening degree of the evaporator and the condenser 4 to reduce the production of cooling capacity and heat transfer. This reduces the cooling effect, lowers the regeneration temperature, and reduces the dehumidification effect, thereby increasing the wet-bulb temperature of the air at the inlet of the indirect evaporative cooler 7, raising the temperature of the produced chilled water, and saving energy. During the transition season: The temperature of the produced chilled water is regulated by controlling the airflow. When the liquid cooling return water temperature is higher than the set value, the airflow is appropriately increased to increase the heat exchange ratio of the gas-liquid heat exchanger 10 and lower the return water temperature. Simultaneously, the increased airflow increases the mass flow rate of the produced chilled water to control the liquid cooling return water temperature.

[0050] Winter: When a risk of freezing is detected, i.e., the temperature is lower than the set value, ethylene glycol is used to replace the water medium to prevent the pipeline from freezing.

[0051] The following are the system's operating conditions during summer:

[0052] The following are the operating conditions of the system during the transition season:

[0053] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions conceived without creative effort should be included within the scope of protection of the present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A waste heat recovery indirect evaporative cooling system suitable for high humidity areas, comprising a primary evaporator (1), wherein a rotor is connected to one side of the primary evaporator (1), the rotor comprising a rotor processing zone (2) and a rotor regeneration zone (3), the primary evaporator (1) being connected to the rotor processing zone (2), characterized in that, A gas-to-gas heat exchanger (5) is connected to one side of the rotary processing area (2), and a secondary evaporator (6) is connected to one side of the gas-to-gas heat exchanger (5). The secondary evaporator (6) is connected to the indirect evaporative cooler (7), and a secondary cooling capacity application device (13) is connected to one side of the indirect evaporative cooler (7). The secondary cooling capacity application device (13) is connected between the secondary evaporator (6) and the indirect evaporative cooler (7). A condenser (4) is connected to one side of the gas-to-gas heat exchanger (5). The condenser (4) is connected to the rotary regeneration zone (3). An indoor medium circulation heat dissipation system is connected to one side of the indirect evaporative cooler (7). The indoor medium circulation heat dissipation system includes a first medium circulation system consisting of the indirect evaporative cooler (7), the outdoor circulation pump (8), and the CDU heat exchanger (9) connected to each other. The second medium circulation system consists of the CDU heat exchanger (9), the gas-liquid heat exchanger (10), the indoor circulating water pump (11), and the data center environmental heat recovery device (12) connected to each other.

2. The indirect evaporative cooling system for waste heat recovery suitable for high humidity areas according to claim 1, characterized in that: The data center environmental heat recovery device (12) is arranged in the data center and is connected to the gas-liquid heat exchanger (10) and the indoor circulating water pump (11).

3. The indirect evaporative cooling system for waste heat recovery suitable for high humidity areas according to claim 1, characterized in that: After the outdoor circulating pump (8) starts working, it circulates the medium of the first medium circulation system in the following order: indirect evaporative cooler (7), CDU heat exchanger (9) and outdoor circulating pump (8).

4. The indirect evaporative cooling system for waste heat recovery suitable for high humidity areas according to claim 1, characterized in that: After the indoor circulating water pump (11) is working, it will circulate the medium of the second medium circulation system. The flow direction is sequentially the data center environmental heat recovery device (12), gas-liquid heat exchanger (10), CDU heat exchanger (9) and indoor circulating water pump (11).

5. A summer operating method for a waste heat recovery indirect evaporative cooling system suitable for high-humidity areas as described in any one of claims 1-4, characterized in that: The primary evaporator (1), the rotary processing zone (2), the gas-to-gas heat exchanger (5), the secondary evaporator (6), the indirect evaporative cooler (7), and the secondary cold energy application device (13) form a fresh air dehumidification and cooling channel. The gas-to-gas heat exchanger (5), the condenser (4), and the rotary regeneration zone (3) form a fresh air dehydration channel. The gas-liquid heat exchanger (10) is closed, and the gas-to-gas heat exchanger (5) is opened.

6. The summer operating method of a waste heat recovery indirect evaporative cooling system suitable for high humidity areas according to claim 5, characterized in that: Fresh air is cooled by the first-stage evaporator (1), enters the rotary processing area (2) for isenthalpic dehumidification and heating, is cooled by the gas-to-gas heat exchanger (5), is further cooled by the second-stage evaporator (6), and then enters the indirect evaporative cooler (7) after being mixed with low-temperature gas by the secondary cold energy application device (13).

7. The summer operating method of a waste heat recovery indirect evaporative cooling system suitable for high humidity areas according to claim 5, characterized in that: Regenerated air path: Fresh air is preheated by the air-to-air heat exchanger (5), and then heated by the condenser (4) before being sent to the rotary regeneration zone (3).

8. The summer operating method of a waste heat recovery indirect evaporative cooling system suitable for high humidity areas according to claim 5, characterized in that: Indoor medium circulation heat dissipation system: The indoor heat generated is recovered by the data center environmental heat recovery device (12). The hot water is cooled by exchanging heat with the cold water prepared by the CDU heat exchanger (9) and the indirect evaporative cooler (7), and then sent back to the data center environmental heat recovery device (12) by the indoor circulating water pump (11).

9. A transitional season operating method for a waste heat recovery indirect evaporative cooling system suitable for high-humidity areas as described in any one of claims 1-4, characterized in that: Disconnect the gas-to-gas heat exchanger (5) from the condenser (4) and the secondary evaporator (6), connect the gas-to-gas heat exchanger (5) directly to the indirect evaporative cooler (7), disconnect the secondary cold energy application device (13) from the secondary evaporator (6) and the indirect evaporative cooler (7), and connect the fresh air to the rotary regeneration zone (3) after passing through the gas-liquid heat exchanger (10). Turn on the gas-liquid heat exchanger (10) and the gas-to-gas heat exchanger (5).

10. The transitional season operating method for a waste heat recovery indirect evaporative cooling system suitable for high-humidity areas according to claim 9, characterized in that: Fresh air path: Fresh air directly enters the rotary processing area (2) for isenthalpic dehumidification and heating, and then is cooled by the gas-to-gas heat exchanger (5) before being sent to the indirect evaporative cooler (7); Regenerated air path: Fresh air is sent to the rotary regeneration zone (3) for low-temperature regeneration after exchanging heat with the indoor recovered heat through the gas-liquid heat exchanger (10); Indoor medium circulation heat dissipation system: The heat generated indoors is recovered by the data center environmental heat recovery device (12). The hot water first takes away some of the heat through the gas-liquid heat exchanger (10), and then cools down by exchanging heat with the cold water prepared by the CDU heat exchanger (9) and the indirect evaporative cooler (7), and is sent back by the indoor circulating water pump (11).

Images