Heat recovery system based on liquid cooling data center

Abstract

The present invention relates to a heat recovery system for a liquid-cooled data center, comprising a high-temperature heat pump, a pressureless heat storage tank, a pressurized heat storage tank, an absorption chiller, a compression chiller, and a water-cooled storage tank. The high-temperature heat pump and a coolant distribution unit form a circulating heat exchange loop. The high-temperature heat pump also forms a circulating heat exchange loop with the pressureless heat storage tank. The hot water output interface of the pressureless heat storage tank is further connected to the pressurized heat storage tank via a first circulating pump unit and a pipeline heater. The pressurized heat storage tank is used to store and output steam. The pressurized heat storage tank is further connected to the absorption chiller via a second circulating pump unit, and forms a circulating heat exchange loop with the pressureless heat storage tank via the absorption chiller. The absorption chiller also forms a circulating heat exchange loop with the air-cooled area of ​​the computer room. The compression chiller is connected to the water-cooled storage tank, which is used to store cooling water for the compression chiller. The present invention employs multiple energy storage methods to achieve peak load shifting and valley shifting, improving the economy and reliability of system operation.

Description

Technical Field

[0001] The present invention belongs to the technical field of comprehensive energy utilization, and in particular relates to a heat recovery system based on a liquid-cooled data center. Background Art

[0002] The total energy consumption of data centers has been rising year by year, creating a severe energy consumption situation. Based on refrigeration principles, achieving a Power Use Effectiveness (PUE) of less than 1.2 or even below 1.1 is currently only possible with liquid-cooled data centers. Furthermore, driven by energy security, electricity substitution, and peak load shifting, electrochemical energy storage power stations are expanding in scale. Energy storage battery systems have large capacity and power, and high power density places high demands on heat dissipation. Furthermore, energy storage systems are prone to internal battery heat generation and uneven temperature distribution. Therefore, temperature control is crucial for the lifespan and safety of battery systems. Immersion liquid cooling technology, in particular, allows energy storage batteries to be submerged in liquid, effectively preventing thermal runaway and heat spread, while also improving fire safety. Liquid cooling solutions are the future trend in industrial cooling.

[0003] Liquid cooling technologies include single-phase immersion, two-phase immersion, spray, and cold plate cooling. Compared to traditional air-based data center cooling technologies, liquid cooling offers thousands of times greater heat dissipation capacity than air cooling. Furthermore, due to the significant difference in the physical properties of liquid and air, liquid-cooled data centers and liquid-cooled energy storage stations can provide a low-grade heat source at approximately 35-50°C year-round—a high-quality heat source for heat pumps. Furthermore, due to the higher heat transfer coefficient of the liquid cooling system's heat exchanger, the required heat exchange area is reduced, the cost is low, and the equipment is more compact, making liquid cooling technology a natural complement to heat pumps.

[0004] Existing heat pump systems primarily source low-temperature heat from air, soil, and various water resources, but these sources often have drawbacks. Providing a stable, high-quality low-temperature heat source is a major challenge for large-scale heat pump applications, yet this presents an advantage for liquid cooling technology. To address the discrepancies between demand and supply, and on different timescales, large-scale interseasonal heat storage systems are already being implemented. Heat pump technology can also address the thermal quality gap between low-temperature heat sources and high-temperature requirements.

[0005] Generally speaking, a high-temperature heat pump is one that can produce water at an outlet temperature of 85°C or higher, while a heat pump that produces water at an outlet temperature of 65°C is called a medium-temperature heat pump or medium-high-temperature heat pump. The emergence of high-temperature heat pumps has greatly expanded the application of heat pumps, allowing them to directly recycle low-grade waste heat resources (20°C to 55°C) to produce hot water (65°C to 90°C).

[0006] If the heating temperature exceeds 100°C, steam can theoretically be generated under normal pressure. This heat pump can be used as a steam generator to meet the needs of industry and daily life. In many industrial scenarios such as brewing and drying, high-temperature heating equipment has huge industry prospects.

[0007] Typically, during heat pump operation, the evaporator absorbs heat and the condenser releases heat, simultaneously generating cold and hot media. Liquid-cooled data centers and energy storage power plants can stop using cooling towers or chillers, further reducing PUE. The generated heat can be stored in containers or directly supplied externally, enabling cascaded energy utilization and waste heat recovery within the liquid-cooled data center or energy storage power plant. Furthermore, depending on the construction level, Class A and Class B data centers require a minimum battery backup time of 15 minutes and 7 minutes (when using a diesel generator as a backup power source). The configured capacity of a diesel generator includes the backup diesel generator capacity of the UPS system and the basic capacity of the base unit for air conditioning and refrigeration equipment. Data centers have relatively high loads. If the system has a heat source above 90°C, the low electrical load requirements of absorption (adsorption) heat pumps can be utilized. This can significantly reduce UPS configuration costs and reduce the capacity of backup power sources such as diesel generators, thereby significantly reducing investment costs. Summary of the Invention

[0008] Based on the above-mentioned shortcomings and deficiencies in the prior art, one of the objects of the present invention is to at least solve one or more of the above-mentioned problems in the prior art. In other words, one of the objects of the present invention is to provide a heat recovery system based on a liquid-cooled data center that meets one or more of the above-mentioned needs.

[0009] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0010] A heat recovery system based on a liquid-cooled data center, wherein the liquid-cooled data center is provided with a computer room liquid cooling zone and a computer room air cooling zone. The computer room liquid cooling zone and the cooling liquid distribution unit constitute a first circulation heat exchange loop, the cooling liquid distribution unit and the first cooling tower constitute a second circulation heat exchange loop, and the first circulation heat exchange loop and the second circulation heat exchange loop perform heat exchange; the computer room air cooling zone and the compression chiller constitute a third circulation heat exchange loop, the compression chiller and the second cooling tower constitute a fourth circulation heat exchange loop, and the third circulation heat exchange loop and the fourth circulation heat exchange loop perform heat exchange. The heat recovery system includes a high-temperature heat pump, a pressureless heat storage tank, a pressurized heat storage tank, an absorption chiller, and a water cold storage tank;

[0011] The high-temperature heat pump and the coolant distribution unit form a fifth circulation heat exchange loop, and the fifth circulation heat exchange loop exchanges heat with the first circulation heat exchange loop;

[0012] The high-temperature heat pump and the pressureless heat storage tank also form a sixth circulation heat exchange loop, which exchanges heat with the fifth circulation heat exchange loop; wherein the pressureless heat storage tank has a hot water output interface for outputting hot water to supply hot water users;

[0013] The hot water output interface of the non-pressure heat storage tank is also connected to the pressurized heat storage tank through the first circulation pump group and the pipeline heater in sequence; the pressurized heat storage tank is used to output steam;

[0014] The pressurized heat storage tank is further connected to the absorption chiller through the second circulating pump group, and forms a seventh circulating heat exchange loop through the absorption chiller and the non-pressurized heat storage tank; wherein the second circulating pump group is connected in parallel with the first circulating pump group;

[0015] The absorption chiller also forms an eighth circulation heat exchange loop with the air cooling area of ​​the machine room, and the eighth circulation heat exchange loop exchanges heat with the seventh circulation heat exchange loop;

[0016] The compression chiller is connected to a cold water storage tank, which is used to store the cooling water of the compression chiller to perform heat exchange on the coolant distribution unit and / or the air cooling area of ​​the machine room.

[0017] As a preferred solution, the steam output interface of the pressurized heat storage tank is connected to the steam generator, the gas-liquid separator, and the steam cylinder in sequence to supply the steam to the steam user end.

[0018] As a preferred solution, two ends of the steam generator are connected in parallel with a direct bypass.

[0019] As a preferred solution, the pressurized heat storage tank is divided into a steam area and a hot water area, the steam area is located above the hot water area, and the steam output interface is connected to the steam area;

[0020] An upper annular water distributor and a lower annular water distributor are provided in the hot water area of ​​the pressurized heat storage tank. The upper annular water distributor is connected to the pipeline heater, and the lower annular water distributor is connected to the second circulation pump group.

[0021] As a preferred solution, the pressurized heat storage tank has a water replenishment port.

[0022] As a preferred solution, an upper water distributor and a lower water distributor are provided in the pressureless heat storage tank, and the upper water distributor and the lower water distributor are respectively the input and output of the sixth circulating heat exchange loop corresponding to the pressureless heat storage tank.

[0023] As a preferred solution, the cold water storage tank is also connected to the absorption chiller to store the cooling water of the absorption chiller.

[0024] As a preferred solution, the cold water storage tank also exchanges heat with the coolant distribution unit through a plate heat exchanger unit.

[0025] As a preferred solution, the water cold storage tank is connected in parallel with a PCM cold storage tank.

[0026] As a preferred solution, the compression chiller adopts a centrifugal chiller or a screw chiller.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] Based on the principle of cascaded energy utilization, this invention utilizes the waste heat generated during the calculation, conversion, and storage of electrical energy. This is coupled with a high-temperature heat pump, a pressurized / unpressurized heat storage system, and a steam generation system to achieve cooling and industrial steam / hot water supply for data centers and energy storage power plants. Furthermore, the pressurized / unpressurized heat storage system and absorption (adsorption) heat pump reduce the required capacity of UPS (uninterruptible power supply) and backup diesel generator systems, thus reducing investment. Furthermore, conventional data center cold storage tanks use a temperature differential of 7-8°C (4-12°C) to store cold, and can only be used in chilled water systems. In the application scenario of this invention, liquid cooling in the computer room accounts for over 70% of the total cooling load, while air cooling accounts for 10-30%. The cold storage tank's cooling capacity can be used simultaneously in both the cooling and chilled water systems by switching between plate heat exchangers. The usable temperature differential ranges from 4-40°C, reaching over 30°C. This effectively increases the cold storage capacity by more than four times for the same cold storage volume, significantly improving system reliability. In addition, the system is equipped with a variety of cold and heat storage tanks, which can utilize off-peak electricity or intermittent waste heat from energy storage power stations to achieve peak shaving and valley filling, thereby reducing daily operating costs; in the event of an accident, the heat storage tank can also be used as an energy source for the absorption chiller to generate cooling capacity with low electrical power. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the architecture of a heat recovery system based on a liquid-cooled data center according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] To more clearly illustrate the embodiments of the present invention, specific embodiments of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other embodiments can be obtained based on these drawings without inventive efforts.

[0031] like Figure 1 As shown, the heat recovery system based on the liquid-cooled data center according to an embodiment of the present invention includes: a high-temperature heat pump 1, a pressureless heat storage tank 2, a pressurized heat storage tank 3, an absorption chiller 4, a water cold storage tank 5, and a PCM cold storage tank 13.

[0032] The liquid-cooled data center is equipped with a machine room liquid cooling zone I and a machine room air cooling zone II. The liquid-cooled cabinets RACK in the machine room liquid cooling zone I and the cooling liquid distribution unit (CDU) III form the first circulation heat exchange loop, while the cooling liquid distribution unit III and the first cooling tower VI form the second circulation heat exchange loop. The first circulation heat exchange loop exchanges heat with the second circulation heat exchange loop. The first circulation heat exchange loop contains liquid cooling coolant, while the second circulation heat exchange loop contains cooling water.

[0033] Furthermore, the computer room's air-cooling zone II and the compression chiller V form a third heat exchange loop, while the compression chiller V and the second cooling tower VI form a fourth heat exchange loop. Both the third and fourth heat exchange loops exchange heat. Cooling water is used in both loops. The compression chillers are either centrifugal or screw-type, and are powered by electricity.

[0034] The following is a detailed description of the heat storage and heating part of the cold and heat recovery system according to an embodiment of the present invention:

[0035] The high-temperature heat pump 1 and the coolant distribution unit III of the embodiment of the present invention form a fifth circulating heat exchange loop, and the cooling water in the fifth circulating heat exchange loop exchanges heat with the liquid-cooled coolant in the first circulating heat exchange loop.

[0036] The high-temperature heat pump 1 of the embodiment of the present invention also forms a sixth circulation heat exchange loop with the pressureless heat storage tank 2, and the sixth circulation heat exchange loop exchanges heat with the fifth circulation heat exchange loop; wherein the pressureless heat storage tank 2 has a hot water output interface for outputting hot water to supply it to the hot water user end, thereby realizing waste heat reuse.

[0037] Specifically, the pressureless heat storage tank 2 of the embodiment of the present invention is provided with an upper water distributor and a lower water distributor, which are respectively the input and output of the sixth circulation heat exchange loop corresponding to the pressureless heat storage tank, thereby realizing circulation between the high-temperature heat pump 1 and the pressureless heat storage tank 2, and improving the uniformity of the hot water temperature distribution in the pressureless heat storage tank 2.

[0038] In addition, the hot water output interface of the pressureless heat storage tank 2 in the embodiment of the present invention is also connected to the pressurized heat storage tank 3 through the first circulation pump group 6 and the pipeline heater 7 in sequence; the pressurized heat storage tank 3 is used to output steam.

[0039] Specifically, the pressurized heat storage tank 3 is divided into a interconnected steam zone 3-1 and hot water zone 3-2. Steam zone 3-1 is located above hot water zone 3-2, and the steam output interface is connected to the steam zone. Specifically, the steam output interface is located within the steam zone. An upper annular water distributor and a lower annular water distributor are located within the hot water zone 3-2. The upper annular water distributor is connected to the pipeline heater 7 for input, while the lower annular water distributor is connected to the second circulation pump unit 8 for output. Furthermore, the pressurized heat storage tank 3 has a water replenishment port 30 to control the liquid level in the pressurized heat storage tank according to the operating strategy.

[0040] The configuration of the water distributor and the annular water distributor can refer to the prior art and will not be described in detail here.

[0041] The steam output interface of the pressurized heat storage tank 3 of the embodiment of the present invention is connected to the steam generator 9, the gas-liquid separator 10, and the steam cylinder 11 in sequence, so as to supply the steam to the steam user end for use.

[0042] In addition, direct-connected bypasses are connected in parallel at both ends of the steam generator 9, which are used when the steam generator is not needed. The specific selection can be made based on the temperature sensor and pressure sensor installed in the steam zone 3-1.

[0043] The pressurized heat storage tank 3 of the embodiment of the present invention is further connected to the absorption chiller 4 through the second circulating pump group 8, and forms a seventh circulating heat exchange loop through the absorption chiller 4 and the pressureless heat storage tank 2; wherein the second circulating pump group 8 is connected in parallel with the first circulating pump group 6.

[0044] The absorption chiller 4 of the present embodiment also forms an eighth heat exchange loop with the air-cooling zone II of the machine room, which exchanges heat with the seventh heat exchange loop. Furthermore, the hot water output of the absorption chiller 4 can be directly supplied to hot water users.

[0045] The compression chiller V of the embodiment of the present invention is connected to the water storage tank 5, which is used to store the cooling water of the compression chiller to perform heat exchange on the cooling liquid distribution unit III and / or the computer room air cooling zone II, so as to ensure the cooling of the computer room liquid cooling zone I and the computer room air cooling zone II under extreme conditions.

[0046] The cold water storage tank 5 of this embodiment of the present invention is also connected to the absorption chiller 4 to store cooling water from the absorption chiller 4. Furthermore, the cold water storage tank 5 exchanges heat with the coolant distribution unit III via the plate heat exchanger 12, thereby connecting to the cooling water pipeline of the coolant distribution unit III. If needed, a bypass can be provided to the plate heat exchanger 12 to allow direct connection to the cooling water channel of the coolant distribution unit III.

[0047] The cold water storage tank 5 of the embodiment of the present invention is further connected in parallel with a PCM cold storage tank 13 to increase the cold storage capacity and usage.

[0048] Since the embodiment of the present invention involves a large number of control valves, they are not described in detail in the embodiment of the present invention. A control valve is installed corresponding to each input and output of each device. For details, please refer to Figure 1 , I will not go into details here.

[0049] The working principle of the heat recovery system based on the liquid cooling data center according to the embodiment of the present invention is as follows:

[0050] Applied to liquid-cooled data centers (can also be used in liquid-cooled energy storage power stations), it is equipped with high-temperature heat pumps, steam generators, pipe heaters, heat storage units (normal pressure heat storage tanks, pressurized heat storage tanks), cold storage units (water cold storage tanks, PCM cold storage tanks), conventional cold source cooling towers, compression chillers, absorption chillers, and plate heat exchangers. In daily operation, it can shut down cold source systems such as cooling towers or refrigeration units, use high-temperature heat pumps, adopt heating mode, and generate hot and cold media at the same time. The cold end can replace the original cooling tower to keep the liquid-cooled coolant system continuously cooled, and the hot end can generate high-temperature hot water / steam, which can be directly supplied to external heat users for direct use. When the load demand of external heat users is low, when the system's heat storage unit reaches its limit, the absorption chiller enters cooling mode, and the generated cooling capacity can be stored in the water cold storage tank and PCM cold storage tank. According to the heat storage strategy, during the peak heat consumption / peak electricity consumption period, the cold capacity in the cold storage tank or the cooling tower is used for cooling, or the heat is taken from the heat storage unit and an absorption chiller is used for cooling to smooth the peak and fill the valley, thereby reducing energy consumption during peak power consumption; in the event of equipment failure and before the diesel generator runs at full power after the dual power supply is switched, the heat stored in the heat storage unit is used for cooling using an absorption chiller, or the cold capacity of the cold storage unit is directly or indirectly exchanged through a plate heat exchanger or a bypass of the plate heat exchanger to meet the cooling needs of the system.

[0051] In the application scenario of the embodiment of the present invention, waste heat is produced all year round, the cooling load is required for 8760 hours a year, and the external supply load is mainly steam and / or hot water.

[0052] Data centers generate relatively stable heat year-round, while energy storage power plants generate heat that fluctuates periodically depending on the charging and discharging loads. To maximize waste heat utilization, both must be decoupled using energy storage units to minimize the impact of external load fluctuations on the cooling system.

[0053] In the embodiment of the present invention, a heat storage tank and a cold storage tank are provided at the same time. When the external heat load is large, heat storage is prioritized, the high-temperature heat pump is turned on, the absorption chiller is turned off, and the pressureless heat storage tank supplies hot water. The hot water can also pass through the first circulation pump group through the pipeline heater to improve the quality of the hot water and increase the temperature of the hot water, and store more energy in the pressurized heat storage tank. When the external heat load is small, when both the pressureless heat storage tank and the pressurized heat storage tank are full, cold storage is prioritized, the high-temperature heat pump is turned on, the absorption chiller is turned on, and the water cold storage tank and the PCM cold storage tank are used to store cold.

[0054] In addition, when the external heat load is small, when the non-pressure heat storage tank, pressurized heat storage tank, water cold storage tank and PCM cold storage tank are all full, turn off the high-temperature heat pump, turn off the absorption chiller, turn on the first cooling tower, and the cooling source of the liquid cooling area of ​​the computer room is provided by the first cooling tower.

[0055] During peak electricity prices, the compression chiller can be shut down and the cold storage unit can be used to provide a cold source for cooling the air-cooled area of ​​the computer room.

[0056] In the process of starting the high-temperature heat pump and the absorption chiller in the embodiment of the present invention, peak and valley periods of electricity prices and external network load requirements are taken into consideration to achieve peak shaving and valley filling, thereby reducing costs and energy consumption.

[0057] The heat storage unit of the embodiment of the present invention can be provided in two types: an open non-pressure heat storage tank is used when the temperature is below 95°C; and a closed pressurized heat storage tank is used when the temperature is above 95°C.

[0058] In the initial heat release phase of the pressurized heat storage tank of the present invention, a bypass path from the steam generator can enter the gas-liquid separator, where steam can be delivered to the user via a gas separator. In the later stages of heat release, the pressurized heat storage tank requires an external heat source to maintain its heat release. This requires switching between the first and second circulating pump groups, closing the hot water output port of the unpressurized heat storage tank, and opening the control valve corresponding to the output of the lower annular water distributor of the pressurized heat storage tank. Continuous heating using a pipeline heater is then performed to flash-evaporate the saturated water in the pressurized heat storage tank into saturated steam. Depending on the external network's steam quality requirements, the steam generator can be integrated or disconnected from the system to adjust the steam dryness and temperature.

[0059] This embodiment of the present invention utilizes an absorption chiller in conjunction with a high-temperature heat pump. Normally, the absorption chiller operates in cooling mode, providing the entire system's cooling load. Due to its low efficiency and energy consumption, it remains on duty. The compression chiller, with its high efficiency, carries the primary load. In the event of a power failure, the compression chiller shuts down or reduces its load, while the absorption chiller increases its load. The secondary cooling tower switches from standby mode to active mode to ensure cooling.

[0060] The heat storage tank in the embodiment of the present invention is provided with a flash evaporation system, and the flash evaporation tank may be a split structure; if it is a pressurized tank, it may also be provided integrally with the pressurized tank.

[0061] In the event of an accident, the power fails, the UPS switches, and before the internal combustion generator set starts as a backup power source with full load, all high-power consumption hot backups such as high-temperature heat pumps, compression chillers, pipe heaters, steam generators, etc. are shut down, and the absorption chiller is turned on. The air cooling part of the liquid-cooled data center accounts for 10%-30% of the total cooling load. The cooling capacity of the cold storage tank can be used simultaneously in the cooling water and chilled water systems (i.e., the chilled water output of the absorption chiller or the compression chiller) under the switching of the plate heat exchanger. The temperature can be used from 4°C to 40°C, reaching a temperature difference of more than 30°C.

[0062] In the liquid-cooled data center of the embodiment of the present invention, the liquid cooling part in the computer room accounts for 70-90% of the total cooling load, and the air cooling part accounts for 10%-30% of the total cooling load. In extreme accident situations, when the temperature of the cold storage tank rises above 25°C, the cold storage tank can no longer discharge cold air to the chilled water system, and the FCU can no longer be used. It is necessary to turn on the absorption chiller and / or the compression chiller to meet the cooling load of the cold air cooling area. In more extreme cases, when the temperature of the cold storage tank rises above 40°C, the chilled water system and the cooling water system can no longer exchange heat through the plate heat exchanger. The plate heat exchanger can be switched to bypass, and the chilled water system directly enters the cooling water system to cool the liquid cooling area of ​​the computer room. At this time, according to the cooling strategy, the cooling tower in the liquid cooling area of ​​the computer room is turned on, and the cooling tower is used to cool the liquid cooling area for synchronous cooling.

[0063] The above description is only a detailed description of the preferred embodiments and principles of the present invention. For ordinary technicians in this field, based on the ideas provided by the present invention, there may be changes in the specific implementation methods, and these changes should also be considered as the scope of protection of the present invention.

Claims

1. A heat recovery system based on a liquid-cooled data center, wherein the liquid-cooled data center is provided with a computer room liquid cooling zone and a computer room air cooling zone, wherein the computer room liquid cooling zone and the cooling liquid distribution unit constitute a first circulation heat exchange loop, wherein the cooling liquid distribution unit and the first cooling tower constitute a second circulation heat exchange loop, wherein the first circulation heat exchange loop and the second circulation heat exchange loop perform heat exchange; wherein the computer room air cooling zone and the compression type chiller constitute a third circulation heat exchange loop, wherein the compression type chiller and the second cooling tower constitute a fourth circulation heat exchange loop, wherein the third circulation heat exchange loop and the fourth circulation heat exchange loop perform heat exchange, wherein: The heat recovery system includes a high-temperature heat pump, a non-pressure heat storage tank, a pressurized heat storage tank, an absorption chiller and a water cold storage tank; The high-temperature heat pump and the coolant distribution unit form a fifth circulation heat exchange loop, and the fifth circulation heat exchange loop exchanges heat with the first circulation heat exchange loop; The high-temperature heat pump and the pressureless heat storage tank also form a sixth circulation heat exchange loop, which exchanges heat with the fifth circulation heat exchange loop; wherein the pressureless heat storage tank has a hot water output interface for outputting hot water to supply hot water users; The hot water output interface of the non-pressure heat storage tank is also connected to the pressurized heat storage tank through the first circulation pump group and the pipeline heater in sequence; the pressurized heat storage tank is used to output steam; The pressurized heat storage tank is further connected to the absorption chiller through the second circulating pump group, and forms a seventh circulating heat exchange loop through the absorption chiller and the non-pressurized heat storage tank; wherein the second circulating pump group is connected in parallel with the first circulating pump group; The absorption chiller also forms an eighth circulation heat exchange loop with the air cooling area of ​​the machine room, and the eighth circulation heat exchange loop exchanges heat with the seventh circulation heat exchange loop; The compression chiller is connected to a cold water storage tank, which is used to store the cooling water of the compression chiller to perform heat exchange on the coolant distribution unit and / or the air cooling area of ​​the machine room.

2. The heat recovery system based on liquid cooling data center according to claim 1 is characterized in that: The steam output interface of the pressurized heat storage tank is connected to the steam generator, the gas-liquid separator, and the steam cylinder in sequence to supply the steam to the steam user end.

3. The heat recovery system based on liquid cooling data center according to claim 2, characterized in that: Both ends of the steam generator are connected in parallel with a direct bypass.

4. The heat recovery system based on liquid cooling data center according to claim 1 is characterized in that: The pressurized heat storage tank is divided into a steam area and a hot water area, the steam area is located above the hot water area, and the steam output interface is connected to the steam area; An upper annular water distributor and a lower annular water distributor are provided in the hot water area of ​​the pressurized heat storage tank. The upper annular water distributor is connected to the pipeline heater, and the lower annular water distributor is connected to the second circulation pump group.

5. The heat recovery system based on liquid cooling data center according to claim 1 is characterized in that: The pressurized heat storage tank has a water replenishment port.

6. The heat recovery system based on liquid cooling data center according to claim 1, characterized in that: The pressureless heat storage tank is provided with an upper water distributor and a lower water distributor, which are respectively the input and output of the sixth circulating heat exchange loop corresponding to the pressureless heat storage tank.

7. The heat recovery system based on liquid cooling data center according to claim 1, characterized in that: The cold water storage tank is also connected to the absorption chiller and is used to store the cooling water of the absorption chiller.

8. The heat recovery system based on liquid cooling data center according to claim 1, characterized in that: The cold water storage tank also exchanges heat with the coolant distribution unit through a plate heat exchange unit.

9. The heat recovery system based on liquid cooling data center according to claim 1, 7 or 8, characterized in that: The water cold storage tank is connected in parallel with a PCM cold storage tank.

10. The heat recovery system based on liquid cooling data center according to claim 1, characterized in that: The compression type chiller adopts a centrifugal chiller or a screw chiller.

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