A multi-energy complementary multi-source heat recovery air conditioning system for data centers

Abstract

The application relates to a multi-energy complementary multi-source heat recovery air conditioning system for a data center, a liquid cooling terminal is connected with a solar heat collector, an adsorption refrigerator and a first plate heat exchanger through pipelines, the solar heat collector is connected with the adsorption refrigerator, the adsorption refrigerator is connected with a first cooling tower, the first plate heat exchanger and a precision air conditioner through pipelines, the first plate heat exchanger is connected with the first cooling tower and a second plate heat exchanger through pipelines, the second plate heat exchanger is connected with a regional heating user through pipelines, the air cooling terminal is connected with the precision air conditioner, an electric refrigerator and a third plate heat exchanger, the electric refrigerator is connected with a second cooling tower, the third plate heat exchanger is connected with a heat pump, and the heat pump is connected with the regional heating user. The application can realize all-year heat recovery, realize multiple functions such as summer heat waste heat recovery for cooling, winter heat recovery for heating, transition season air free cooling for cooling and the like, effectively improve all-year heat recovery rate, and reduce the PUE of a machine room.

Description

Technical Field

[0001] This application relates to the field of heat recovery and energy-saving technology, specifically to a multi-energy complementary multi-source heat recovery air conditioning system for data centers. Background Technology

[0002] Data center energy consumption consists of power supply and distribution, lighting, cooling, and IT equipment power consumption. Among these, air conditioning accounts for approximately 30%-50% of energy consumption, has high cooling costs, and significant energy-saving potential.

[0003] Traditional small to medium-sized data centers can generate 3.2MW to 6.4MW of heat value. New-generation data centers follow a trend of increasing density, generating more and more heat. Typically, the operating temperature of data center rooms needs to be controlled between 18℃ and 25℃. The heat generated by data center equipment must be dissipated promptly, making data centers a stable heat source year-round, thus providing the possibility for waste heat recovery.

[0004] Currently, existing data centers typically release this heat into the atmosphere through water cooling or air cooling, making it impossible to recover and reuse this heat. Even if waste heat is recovered, it is mainly used in winter to provide heating or hot water to surrounding users through heat pumps or directly. In summer and transitional seasons, the waste heat is not fully utilized, resulting in a huge waste of energy. Moreover, existing heat recovery technologies do not reduce their own power consumption or reduce PUE by supplying more waste heat to surrounding heat users. Summary of the Invention

[0005] The purpose of this application is to provide a multi-energy complementary multi-source heat recovery air conditioning system for data centers, which can supply waste heat to surrounding heat users in winter, and at the same time make full use of waste heat in summer to meet the air-cooling needs of the data center, effectively reducing the energy consumption of air-cooling and the power consumption of the data center, thereby reducing PUE and realizing a truly green data center.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] This application provides a multi-energy complementary multi-source heat recovery air conditioning system for data centers, including a liquid-cooled terminal, an air-cooled terminal, a solar collector, an adsorption chiller, a first plate heat exchanger, a first cooling tower, a second plate heat exchanger, district heating users, a heat pump, a precision air conditioner, a third plate heat exchanger, the second cooling tower, and an electric chiller. The liquid-cooled terminal is connected to the solar collector, the adsorption chiller, and the first plate heat exchanger via pipelines. The air-cooled terminal is connected to the precision air conditioner. The solar collector is connected to the adsorption chiller via pipelines. The system connects a first cooling tower, a precision air conditioner, and a first plate heat exchanger. The first plate heat exchanger is connected to the first cooling tower, a second plate heat exchanger, an adsorption chiller, and a liquid-cooled terminal via pipelines. The second plate heat exchanger is connected to district heating users via pipelines. The air-cooled terminal is connected to the precision air conditioner. The precision air conditioner is connected to an electric chiller, a third plate heat exchanger, and an adsorption chiller via pipelines. The cooling side of the electric chiller is connected to the second cooling tower and the third plate heat exchanger. The third plate heat exchanger is connected to a heat pump. The heat pump is connected to district heating users via pipelines, a water pump, etc.

[0008] A first water pump and a first valve are respectively installed between the pipes connecting the liquid cooling terminal and the solar collector. One output of the first water pump is connected to the first valve and then inputs to the solar collector. The other output of the first water pump is connected to the second valve and the third valve in sequence and then connected to the input of the first plate heat exchanger. A pipe is connected between the second valve and the third valve and connected in parallel with the outlet pipe of the solar collector. One output of the first plate heat exchanger is connected to the liquid cooling terminal, and the other output is connected to the input of the second water pump. The output of the second water pump is connected to the first cooling tower through the fourth valve and to the second plate heat exchanger through the fifth valve. The second plate heat exchanger is connected to the input of the first plate heat exchanger through the sixth valve and the seventh valve.

[0009] The output end of the first cooling tower is divided into two branches through a pipeline. One branch is connected to the condenser of the adsorption chiller through the eighth valve, and the other branch is connected to the input end of the first plate heat exchanger through the seventh valve. The condenser and the first plate heat exchanger are connected through a pipeline.

[0010] The output end of the second plate heat exchanger is connected to the district heating user through the fifth water pump. A seventh water pump is installed between the district heating user and the heat pump. A sixth water pump and a twenty-sixth valve are installed on the pipeline between the heat pump and the third plate heat exchanger.

[0011] The pipeline between the evaporator and the precision air conditioner is equipped with a fourteenth valve and a fifteenth valve.

[0012] A third water pump is installed on the outlet main pipe of the precision air conditioner. A sixteenth valve is installed between the pipeline connecting the precision air conditioner and the electric chiller. One output of the third water pump is connected to the sixteenth valve and then inputs to the electric chiller. The other output is connected to the seventeenth valve and then connected to the input of the third plate heat exchanger. An eighteenth valve is installed on the pipeline between the output of the third plate heat exchanger and the precision air conditioner. A twentieth valve is installed on the branch pipeline of the pipeline between the output of the third plate heat exchanger and the electric chiller, and is connected to the electric chiller through the twentieth valve. A nineteenth valve is installed on the pipeline between the electric chiller and the precision air conditioner.

[0013] A twenty-first valve is installed on the pipeline between the third plate heat exchanger and the second cooling tower. This pipeline is connected to the pipeline between the twenty-third valve and the fourth water pump. A twenty-third valve and the fourth water pump are installed on the pipeline between the electric chiller and the second cooling tower. A twenty-second valve is installed on a branch pipe of the third plate heat exchanger and connected to the electric chiller. A branch pipe of the third plate heat exchanger is connected to the pipeline between the twenty-fifth valve and the electric chiller. A twenty-fifth valve is installed on one output pipeline of the second cooling tower and connected to the electric chiller. A twenty-fourth valve is installed on another output pipeline of the second cooling tower and connected to the third plate heat exchanger.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] This invention uses solar collectors and adsorption chillers to recover waste heat from data centers and generate cooling. It can effectively recover the heat dissipation of data centers in summer and use it for computer room cooling, solving the problem of difficulty in heat recovery and utilization in existing data centers in summer, realizing year-round heat recovery, reducing the energy consumption of computer room cooling and air conditioning, and making full use of renewable energy to reduce fossil energy consumption and reduce the power usage effect (PUE) of the computer room.

[0016] The technology proposed in this invention, which utilizes adsorption chillers to recover waste heat from data centers, can achieve all-day heat recovery regardless of external meteorological parameters, greatly improving the heat recovery rate of data centers. Adsorption chillers can produce chilled water at 5-15°C through relatively low driving temperatures (55-90°C). The resulting chilled water can be used by the air-cooling system of the data center, thereby reducing the cooling capacity required for mechanical cooling on the air-cooled side and the total energy consumption of data center air conditioning, effectively reducing the data center's PUE (Power Usage Effectiveness).

[0017] This invention proposes a multi-source heat recovery system that makes full use of natural cold sources. When the wet-bulb temperature is low, natural cooling can effectively reduce the power consumption of the computer room air conditioning and reduce the PUE of the computer room.

[0018] The waste heat recovery system used in this invention can meet the heating needs of surrounding users while ensuring the cooling of the data center. It not only maximizes waste heat recovery but also creates additional revenue for the data center.

[0019] The recycling equipment used in this invention has low cost, significant economic benefits, and remarkable energy-saving effects. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a diagram of a multi-energy complementary multi-source heat recovery air conditioning system for data centers according to the present invention.

[0022] Figure 2 This is a schematic diagram of the subsystem partitioning of the system diagram of this invention. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will now be described with reference to the accompanying drawings. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0024] The terms “comprising,” “including,” or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0025] The terms “first,” “second,” etc., are used only to distinguish one entity or operation from another, and should not be construed as indicating or implying relative importance, nor as requiring or implying any such actual relationship or order between these entities or operations.

[0026] like Figure 1As shown in the figure, this application provides a multi-energy complementary multi-source heat recovery air conditioning system for data centers, including a liquid-cooled terminal 1, an air-cooled terminal 2, a solar collector 3, an adsorption chiller, a first plate heat exchanger 5, a first cooling tower 7, a second plate heat exchanger 8, a district heating user 9, a heat pump 10, a precision air conditioner 13, a third plate heat exchanger 14, a second cooling tower 15, and an electric chiller 16. The liquid-cooled terminal 1 is connected to the solar collector 3, the adsorption chiller, and the first plate heat exchanger 5 via pipelines. The air-cooled terminal 2 is connected to the precision air conditioner 13, and the solar collector 3 is connected to the adsorption chiller 16. The adsorption-type refrigeration unit is connected to a first cooling tower 7, a precision air conditioner 13, and a first plate heat exchanger 5 via pipelines. The first plate heat exchanger 5 is connected to the first cooling tower 7 and a second plate heat exchanger 8 via pipelines. The second plate heat exchanger 8 is connected to a district heating user 9 via pipelines. The district heating user 9 is connected to a heat pump 10 via pipelines. The heat pump 10 is connected to a third plate heat exchanger 14 via pipelines. The precision air conditioner 13 is connected to the third plate heat exchanger 14 and an electric refrigeration unit 16 via pipelines. The third plate heat exchanger 14 is connected to a second cooling tower 15 and an electric refrigeration unit 16 via pipelines.

[0027] A first water pump P1 and a first valve V1 are respectively installed between the pipe connecting the liquid cooling terminal 1 and the solar collector 3. One output of the first water pump P1 is connected to the first valve V1 and then inputs to the solar collector 3. The other output of the first water pump P1 is connected to the second valve V2 and the third valve V3 in sequence and then connected to the input of the first plate heat exchanger 5. A pipe is connected between the second valve V2 and the third valve V3 and connected to the first adsorber 4 of the adsorption chiller. One output of the first plate heat exchanger 5 is connected to the liquid cooling terminal 1. The other output of the first plate heat exchanger 5 is connected to the input of the second water pump P2. The output of the second water pump P2 is connected to the first cooling tower 7 through the fourth valve V4 and to the second plate heat exchanger 8 through the fifth valve V5. The second plate heat exchanger 8 is connected to the input of the first plate heat exchanger 5 through the sixth valve V6 and the seventh valve V7.

[0028] The output end of the first cooling tower 7 is connected to the eighth valve V8 and then outputs to the condenser 6 of the adsorption chiller. Another pipe of the output end of the first cooling tower 7 is connected to the seventh valve V7 and then outputs to the first plate heat exchanger 5. The condenser 6 and the first plate heat exchanger 5 are connected by a pipe.

[0029] The output end of the second plate heat exchanger 8 is connected to the district heating user 9 through the fifth water pump P5. The district heating user 9 is connected to the heat pump 10 through the seventh water pump P7. The heat pump 10 is connected to the third plate heat exchanger 14 through the sixth water pump P6 and the twenty-sixth valve V26.

[0030] A fourteenth valve V14 is installed on the pipeline between the evaporator 12 and the precision air conditioner 13. A fifteenth valve V15 is installed on the pipeline between the output end of the precision air conditioner 13 and the input end of the evaporator 12. A third water pump P3 and a sixteenth valve V16 are respectively installed between the pipeline connecting the precision air conditioner 13 and the electric chiller 16. One output end of the third water pump P3 is connected to the sixteenth valve V16 and then inputs to the electric chiller 16. Another output end of the third water pump P3 is connected to the seventeenth valve V17 and then connected to the input end of the third plate heat exchanger 14. An eighteenth valve V18 is installed on the pipeline between the third plate heat exchanger 14 and the precision air conditioner 13. A twentieth valve V20 is installed on a branch pipeline of the pipeline between the third plate heat exchanger 14 and the precision air conditioner 13 and connects to the electric chiller 16. A nineteenth valve V19 is installed on the pipeline between the electric chiller 16 and the precision air conditioner 13.

[0031] A twenty-first valve V21 is installed on the pipeline between the third plate heat exchanger 14 and the second cooling tower 15 and is connected to the second cooling tower 15. This pipeline is connected to the pipeline between the twenty-third valve and the fourth water pump. A twenty-third valve V23 and a fourth water pump P4 are installed on the pipeline between the electric chiller 16 and the second cooling tower 15. A twenty-second valve V22 is installed on the branch pipe between the third plate heat exchanger 14 and the second cooling tower 15 and is connected to the electric chiller 16. A branch pipe of the third plate heat exchanger 14 is connected to the pipeline after the twenty-fifth valve, i.e., the pipeline between the second cooling tower 15 and the electric chiller 16. A twenty-fifth valve V25 is installed on one output pipeline of the second cooling tower 15 and is connected to the electric chiller 16. A twenty-fourth valve V24 is installed on the other output pipeline of the second cooling tower 15 and is connected to the third plate heat exchanger 14.

[0032] like Figure 1 The diagram shown is an overall system diagram. Figure 2 The subsystem partition diagram shown includes 5 subsystems: liquid-cooled side cooling system (liquid-cooled terminal 1 + first plate heat exchanger 5 + first cooling tower 7), liquid-cooled side waste heat recovery cooling system (liquid-cooled terminal 1 + adsorption chiller + solar collector 3 + first cooling tower 7), liquid-cooled side heat recovery heating system (liquid-cooled terminal 1 + first plate heat exchanger 5 + second plate heat exchanger 8), air-cooled side cooling system (electric chiller 16 + third plate heat exchanger 14 + second cooling tower 15 + precision air conditioner 13), and air-cooled side waste heat recovery heating system (precision air conditioner 13 + third plate heat exchanger 14).

[0033] In this embodiment, the liquid-cooled cooling system provides low-temperature coolant to the data center servers. The high-temperature coolant output end of the liquid-cooled cooling system is connected to the heat source inlet of the adsorption chiller of the liquid-cooled waste heat recovery cooling system to cool the high-temperature coolant, which is then further cooled by the first plate heat exchanger 5. During the non-heating season when solar radiation is strong, the high-temperature coolant output end is connected to the heat source inlet of the solar collector 3 of the liquid-cooled waste heat recovery cooling system to increase the temperature of the high-temperature coolant. The outlet of the solar collector 3 is connected to the adsorption chiller to cool the high-temperature coolant, which is then further cooled by the first plate heat exchanger 5. The adsorption refrigeration unit of the liquid-cooled waste heat recovery cooling system is connected to the air-cooled precision air conditioner 13 of the air-cooled cooling system. The liquid-cooled waste heat recovery cooling system recovers waste heat from the data center and solar collector 3 to supply the air-cooled precision air conditioner 13. The liquid-cooled heat recovery cooling system and the first plate heat exchanger 5 of the liquid-cooled waste heat cooling system share the same source circuit. Their load-side circuits are controlled by valves. The liquid-cooled heat recovery cooling system operates during the heating season. The air-cooled waste heat recovery cooling system and the third plate heat exchanger 14 of the air-cooled cooling system share the same source circuit. The load-side circuits are also controlled by valves. Similarly, the air-cooled waste heat recovery cooling system operates during the heating season to provide heat to users.

[0034] Example 1

[0035] The liquid-cooled side cooling system includes a liquid-cooled terminal 1 for the data center, a first plate heat exchanger 5, a first cooling tower 7, a first water pump P1 and a second water pump P2, a second valve V2, a fourth valve V4, and an eighth valve V8.

[0036] In this embodiment, the liquid-cooled cooling system operates year-round. During the non-heating season at night or when solar radiation is weak, the liquid-cooled terminal 1 outputs high-temperature coolant. The high-temperature coolant is first cooled by an adsorption chiller and then further cooled by the first plate heat exchanger 5, thereby sending the low-temperature coolant to the liquid-cooled terminal 1 to cool the data center IT equipment. Meanwhile, the temperature of the cold fluid in the first plate heat exchanger 5 rises, and the heat is discharged to the outside through the first cooling tower 7.

[0037] Specifically, during the non-heating season at night or when solar radiation is weak, the second valve V2, the fourth valve V4, and the eighth valve V8 are opened, while all other valves are closed. The high-temperature coolant generated by the liquid cooling terminal 1 of the data center passes through the second valve V2, is first cooled by the adsorption chiller, and then is completely output to the first plate heat exchanger 5. The first plate heat exchanger 5 transfers the heat of the high-temperature coolant to the cold fluid through heat exchange, thereby heating the cold fluid and increasing its temperature. The temperature of the high-temperature coolant is then reduced and sent to the liquid cooling terminal 1. Then, the heat of the cold fluid in the first plate heat exchanger 5 is exchanged with the outdoor air of the first cooling tower 7 through the fourth valve V4. The outdoor air absorbs the heat of the cold fluid, causing its temperature to drop, and then passes through the eighth valve V8, first through the condenser 6 of the adsorption chiller, and then back to the first plate heat exchanger 5, thereby achieving free cooling and waste heat cooling.

[0038] Example 2

[0039] The liquid-cooled waste heat recovery cooling system includes a liquid-cooled terminal 1 for the data center, a solar collector 3, an adsorption chiller, a first plate heat exchanger 5, a first cooling tower 7, a first water pump P1, a second water pump P2, a third water pump P3, a first valve V1, a fourth valve V4, and an eighth valve V8.

[0040] In this embodiment, the heat generated by the CPU and GPU in the data center electronic devices can be cooled by the liquid cooling terminal 1. After absorbing heat, the coolant in the liquid cooling terminal 1 will increase in temperature to form a high-temperature coolant, which will be output from the high-temperature coolant output terminal of the data center, thereby cooling the various electronic devices in the data center. It is understood that the liquid cooling terminal can be positioned close to the GPU and CPU in the electronic devices to improve the liquid cooling effect. The aforementioned waste heat recovery and cooling system on the liquid cooling side of the data center can recover the heat from the high-temperature coolant output by the data center. To ensure the efficient operation of the adsorption chiller, the output high-temperature coolant is sent to the solar collector 3. The solar collector 3 further raises the temperature of the high-temperature coolant to within the efficient operating temperature range (70-95℃) of the adsorption chiller. The adsorption chiller then absorbs the heat from the high-temperature coolant to produce low-temperature coolant. This low-temperature coolant cools the liquid-cooled terminal electronic equipment in the data center. If the low-temperature coolant does not reach the upper limit temperature of the liquid-cooled terminal, it needs to be cooled again. At this time, the first cooling tower 7 needs to cool it again before sending the low-temperature coolant to the liquid-cooled terminal to cool the electronic equipment. At the same time, the adsorption chiller produces low-temperature chilled water, which can provide some cooling capacity for the air-cooled terminal of the data center. Although liquid cooling can more effectively remove heat from the data center, 20%-35% of the heat still needs to be dissipated through air cooling. Therefore, the cold air blown out by the air-cooled terminal is to remove the part of the heat that cannot be completely dissipated by liquid cooling.

[0041] Specifically, during the operation of the waste heat recovery and cooling system on the liquid cooling side of the data center, when solar radiation is strong during the daytime in the non-heating season, the first valve V1 is opened, and the second valve V2 and the third valve V3 are closed. The high-temperature coolant generated at the liquid cooling terminal of the data center is output to the inlet of the solar collector 3. The solar collector 3 further increases the temperature of the high-temperature coolant before outputting it to the first adsorber 4 of the adsorption chiller. The first adsorber 4 absorbs the heat from the high-temperature coolant, and after adsorption refrigeration cycle, chilled water is generated and delivered to the precision air conditioner 13. The condensation heat generated by the adsorption refrigeration cycle is released to the cooling water through the condenser 6. The cooling water absorbs heat in the condenser and is heated, and then absorbs heat in the plate heat exchanger 5 and is further heated before being cooled in the first cooling tower 7. Usually, the high-temperature coolant is not cooled enough after being cooled by the adsorption chiller to meet the liquid cooling supply temperature, so it needs to exchange heat with the cold fluid end through the first plate heat exchanger 5. The fourth valve V4 is opened, the seventh valve V7 is closed, and the eighth valve V8 is opened. The heat from the cooling water in the condenser of the adsorption chiller first passes through the first plate heat exchanger 5 and then through the first cooling tower 7 to exchange heat with the outdoor air before being discharged outdoors. During the non-heating season at night or when solar radiation is weak, the solar collector 3 is turned off, but the adsorption chiller remains on. The liquid-cooled coolant first passes through the adsorption chiller to cool down, and then passes through the first plate heat exchanger 5 and the first cooling tower 7 for further heat exchange before being sent to the liquid-cooled terminal. This achieves the goal of meeting the data center's heat dissipation needs while simultaneously providing cooling capacity for the data center's air-cooled side, thereby reducing power consumption, lowering the data center's PUE, and improving energy efficiency.

[0042] Example 3

[0043] The liquid-cooled side heat recovery and heat generation system includes a liquid-cooled terminal 1 for the data center, a first plate heat exchanger 5, a second plate heat exchanger 8, a first water pump P1, a second water pump P2, a fifth water pump P5, a second valve V2, a third valve V3, a fifth valve V5, a sixth valve V6, and a seventh valve V7.

[0044] In this embodiment, the high-temperature coolant output from the liquid cooling terminal in the data center can also be recovered by the liquid cooling side heat recovery system. The heat from the high-temperature coolant is first exchanged through the first plate heat exchanger 5, then exchanged through the second plate heat exchanger 8, and finally transferred to the district heating users to meet their heating needs.

[0045] Specifically, during the operation of the heat recovery system on the liquid cooling side of the data center, valves V2, V3, V5, V6, and V7 are opened. The high-temperature coolant generated at the liquid cooling terminal in the data center is sequentially output through valves V2 and V3 to the first plate heat exchanger 5. The first plate heat exchanger 5 transfers heat from the high-temperature coolant on the liquid cooling side to the cold fluid in the first plate heat exchanger 5 through heat exchange, thereby heating the cold fluid and increasing its temperature. Then, through valve V5, the heated cold fluid is output to the second plate heat exchanger 8, where it exchanges heat with the cold fluid. Finally, the heat from the cold fluid in the second plate heat exchanger 8 is transferred to the district heating users. After the heat from the cold fluid is taken away by the district heating users, it returns to the second plate heat exchanger 8. This achieves the goal of meeting the heat dissipation requirements of the data center while fully recovering the waste heat of the data center, which not only improves energy utilization but also increases the revenue of the data center.

[0046] Example 4

[0047] The air-cooled side cooling system includes a data center precision air conditioner 13, an electric chiller 16, a third plate heat exchanger 14, a second cooling tower 15, a third water pump P3 and a fourth water pump P4, and sixteenth valve V16, seventeenth valve V17, eighteenth valve V18, twentieth valve V20, twenty-first valve V21, twenty-second valve V22, twenty-third valve V23, twenty-fourth valve V24, and twenty-fifth valve V25.

[0048] In this embodiment, when the wet-bulb temperature is high in summer, the cooling capacity required by the data center air-cooling system is provided by turning on the electric chiller 16 and the adsorption chiller; when the wet-bulb temperature is low, the return water of the precision air conditioning chilled water is connected to the source side of the third plate heat exchanger 14. First, the chilled water enters the third plate heat exchanger 14 through the seventeenth valve V17 and exchanges heat with the cold fluid in the third plate heat exchanger 14, thus reducing the temperature of the chilled water. If the temperature of the chilled water does not meet the cooling requirements of the data center, the chilled water cooled by the third plate heat exchanger 14 is further cooled by the electric chiller 16, thus completing the cooling cycle; when the wet-bulb temperature is low enough, all the cooling capacity required by the data center air-cooling system is provided by the third plate heat exchanger 14 and the second cooling tower 15 absorbing the cold energy from the outside air.

[0049] Specifically, when the wet-bulb temperature is high in summer, valves 16 (V16), 19 (V19), 23 (V23), and 25 (V25) are opened, while valves 17 (V17), 18 (V18), 20 (V20), 21 (V21), 22 (V22), and 24 (V24) are closed. After the air-cooled chilled water absorbs heat in the precision air conditioner of the data center, its temperature rises. It is then sent back to the electric chiller 16 via valve 16 for evaporative cooling, absorbing heat to cool the chilled water and form low-temperature chilled water. This low-temperature chilled water is then sent to the precision air conditioner 13 via valve 19 (V19). Meanwhile, the heat from the chilled water is transferred to the second valve... Valve V23 (13th valve) allows the cooling water in the second cooling tower 15 to exchange heat with the outdoor air and be discharged outdoors. The cooled water then returns to the condenser of the electric chiller 16 via valve V25 (25th valve). When the wet-bulb temperature is low, valves V17 (17th valve), V20 (20th valve), V22 (22nd valve), and V24 (24th valve) are opened, while valves V18 (18th valve) and V21 (21st valve) are closed. The air carrying waste heat in the data center exchanges heat with the chilled water through the precision air conditioner, raising the chilled water temperature. The chilled water is then first discharged through valve V17 to the third plate heat exchanger 14 for heat exchange with the third plate heat exchanger. In the cooling system 14, the cold fluid undergoes heat exchange, increasing its temperature and decreasing the chilled water temperature. It is then determined whether the chilled water temperature has reached the required temperature for the data center. If not, the twentieth valve V20 is opened to further cool the chilled water through the electric chiller 16 before sending it to the precision air conditioner. The cooling water first passes through the third plate heat exchanger 14 to increase its temperature, then passes through the twenty-second valve V22 into the electric chiller 16, and then into the second cooling tower 15 to exchange heat with the outdoor air, discharging the heat outdoors. The cooled water then returns to the plate heat exchanger 14 through the twenty-fourth valve. When the wet-bulb temperature is sufficiently low, the sixteenth valve V16 is closed. The nineteenth valve V19, the twentieth valve V20, the twenty-second valve V22, the twenty-third valve V23, and the twenty-fifth valve V25 are opened, while the seventeenth valve V17, the eighteenth valve V18, the twenty-first valve V21, and the twenty-fourth valve V24 are opened. The third plate heat exchanger 14 exchanges heat with the second cooling tower 15 to cool the chilled water. When the chilled water reaches the required temperature, it is sent to the precision air conditioner 13. The heat carried by the cooling water is discharged to the outside through the second cooling tower 15 via the twenty-first valve V21 and then through the twenty-fourth valve V24 back to the third plate heat exchanger 14.

[0050] Example 5

[0051] The air-cooled waste heat recovery and heat generation system includes a data center precision air conditioner 13, a third plate heat exchanger 14, a heat pump 10, a third water pump P3, a sixth water pump P6, a seventeenth valve V17, an eighteenth valve V18, a twenty-sixth valve V26, and a twenty-seventh valve V27.

[0052] In this embodiment, the air heat carrying waste heat in the data center is first discharged to the chilled water through the precision air conditioner 13. The chilled water exchanges heat with the cold fluid end of the third plate heat exchanger 14 and outputs the heat to the heat pump 10. The heat pump 10 performs mechanical work to improve the quality of the waste heat to meet the heating needs of the heat users.

[0053] Specifically, during the heating season, when the waste heat recovery system on the air-cooled side of the data center is operating, valves 17 (V17), 18 (V18), 26 (V26), and 27 (V27) are opened. The high-temperature fluid outlet of the third plate heat exchanger 14 is connected to the precision air conditioning inlet, and the high-temperature fluid inlet is connected to the precision air conditioning outlet. The low-temperature fluid inlet of the third plate heat exchanger 14 is connected to the heat pump source-side fluid outlet, and the low-temperature fluid outlet is connected to the heat pump source-side inlet. The heat from the circulating air in the data center is carried away by the chilled water from the precision air conditioning system, thus increasing the chilled water temperature. When valve 17 is opened, the chilled water exchanges heat with the cold fluid in the third plate heat exchanger 14, thereby heating the cold fluid and raising its temperature, while the chilled water temperature decreases. Then valve 18 is opened to send the chilled water back to the precision air conditioner 13. The heated cold fluid has a low residual heat quality at this time, so it is output as a low-temperature heat source to the heat pump 10. The heat pump 10 absorbs the heat from the low-temperature heat source, and then uses the compressor to consume mechanical work to improve its quality and make it a high-temperature heat source. The high-temperature heat source is then output to the district heating users through valve 26.

[0054] The free cooling end of the liquid-cooled side cooling system (liquid-cooled terminal + plate heat exchanger + cooling tower) of the present invention exchanges heat with the air through the cooling tower and dissipates it outdoors.

[0055] The solar collector of the liquid-cooled waste heat recovery cooling system (liquid-cooled terminal + adsorption chiller + solar collector + cooling tower) is connected to the heat source end of the adsorption chiller to provide a higher heat source temperature.

[0056] The liquid-cooled waste heat recovery cooling system (liquid-cooled terminal + adsorption chiller + solar collector + cooling tower) has its adsorption refrigeration system connected to the air-cooled precision air conditioner and matched with the electric refrigeration system to meet the cooling capacity of the air-cooled system.

[0057] The heat recovery end of the liquid-cooled side heat recovery system (liquid-cooled terminal + plate heat exchanger) is connected to the regional pipe network for heating, while the heat recovery end of the air-cooled side waste heat recovery system (precision air conditioner + plate heat exchanger) is heated by a heat pump and then connected to the regional heating pipe network to provide heating.

[0058] The air-cooled side cooling system (precision air conditioner + electric chiller + plate heat exchanger + cooling tower) is connected to the air-cooled terminal of the data center to provide cooling capacity.

[0059] This multi-energy complementary waste heat recovery air conditioning system provides cooling for the data center and heating for surrounding heat users. It can achieve year-round heat recovery, significantly improve the waste heat recovery rate of the data center, and reduce the energy consumption of the air-cooled part of the data center, thereby reducing the data center's PUE and reducing the data center's operating costs. It is a low-carbon and efficient heat recovery and cooling technology.

[0060] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A multi-energy complementary multi-source heat recovery air conditioning system for data centers, characterized in that, The system includes a liquid-cooled terminal (1), an air-cooled terminal (2), a solar collector (3), an adsorption chiller, a first plate heat exchanger (5), a first cooling tower (7), a second plate heat exchanger (8), a district heating user (9), a heat pump (10), a precision air conditioner (13), a third plate heat exchanger (14), a second cooling tower (15), and an electric chiller (16). The liquid-cooled terminal (1) is connected to the solar collector (3), the adsorption chiller, and the first plate heat exchanger (5) via pipelines. The solar collector (3) is connected to the adsorption chiller. The adsorption chiller is connected to the first cooling tower (7), the first plate heat exchanger (5), and the second plate heat exchanger (8) via pipelines. A precision air conditioner (13) is connected to a first cooling tower (7), a second plate heat exchanger (8), and an adsorption chiller via pipelines. The second plate heat exchanger (8) is connected to a regional heating user (9) via pipelines. The air-cooled terminal (2) is connected to the precision air conditioner (13). The precision air conditioner (13) is connected to an electric chiller (16) and a third plate heat exchanger (14) via pipelines. The electric chiller (16) is connected to a second cooling tower (15) and a third plate heat exchanger (14). The third plate heat exchanger (14) is connected to a heat pump (10). The heat pump (10) is connected to the regional heating user (9) via pipelines, a water pump, etc.

2. The multi-energy complementary multi-source heat recovery air conditioning system for data centers according to claim 1, characterized in that, The liquid-cooled terminal (1) is connected to the adsorption chiller, and the evaporator (12) of the adsorption chiller is connected to the precision air conditioner (13) of the air-cooled terminal.

3. A multi-energy complementary multi-source heat recovery air conditioning system for a data center according to claim 2, characterized in that, A first water pump (P1) and a first valve (V1) are respectively installed between the pipe connecting the liquid cooling terminal (1) and the solar collector (3). The pipe at the output end of the first water pump (P1) is divided into two branches. One branch is connected to the first valve (V1) and then inputs to the solar collector (3). The other branch is connected to the second valve (V2) and the third valve (V3) and then connected to the input end of the first plate heat exchanger (5). A pipe is connected between the second valve (V2) and the third valve (V3) to the adsorption... The first adsorber (4) of the chiller is connected. One of the two outlets of the first plate heat exchanger (5) is connected to the liquid cooling terminal (1) and the other is connected to the input of the second water pump (P2). The output of the second water pump (P2) is connected to the first cooling tower (7) through the fourth valve (V4) and to the second plate heat exchanger (8) through the fifth valve (V5). The second plate heat exchanger (8) is connected to the input of the first plate heat exchanger (5) through the sixth valve (V6) and the seventh valve (V7).

4. A multi-energy complementary multi-source heat recovery air conditioning system for a data center according to claim 2, characterized in that, The output end of the first cooling tower (7) is connected to the condenser (6) of the adsorption chiller, and the condenser (6) is connected to the first plate heat exchanger (5) through a pipeline.

5. A multi-energy complementary multi-source heat recovery air conditioning system for a data center according to claim 2, characterized in that, A fourteenth valve (V14) is installed on the pipeline between the evaporator (12) of the adsorption chiller and the precision air conditioner (13). A fifteenth valve (V15) is installed on the pipeline between the output end of the precision air conditioner (13) and the input end of the evaporator (12). A third water pump (P3) and a sixteenth valve (V16) are respectively installed between the pipeline connecting the precision air conditioner (13) and the electric chiller (16). The output end of the third water pump (P3) is connected to the sixteenth valve (V16) and then inputs into the electric chiller (16). The output of the three water pump (P3) is connected to the fifteenth valve (V15) and then to the evaporator (12) of the adsorption chiller. The eighteenth valve (V18) is installed on the pipeline between the third plate heat exchanger (14) and the precision air conditioner (13). The twentieth valve (V20) is installed on the branch pipeline of the pipeline between the third plate heat exchanger (14) and the precision air conditioner (13) and connected to the input end of the electric chiller (16). The nineteenth valve (V19) is installed on the pipeline between the electric chiller (16) and the precision air conditioner (13).

6. A multi-energy complementary multi-source heat recovery air conditioning system for a data center according to claim 2, characterized in that, A twenty-first valve (V21) is installed on the pipeline between the third plate heat exchanger (14) and the second cooling tower (15) and connected to the second cooling tower (15). This pipeline is connected to the pipeline between the twenty-third valve (V23) and the fourth water pump (P4). A twenty-third valve (V23) and the fourth water pump (P4) are installed on the pipeline between the electric chiller (16) and the second cooling tower (15). A twenty-second valve (V22) is installed on the branch pipe of the third plate heat exchanger (14) and connected to the electric chiller (16). A branch pipe of the third plate heat exchanger (14) is connected to the pipeline between the second cooling tower (15) and the electric chiller (16). A twenty-fifth valve (V25) is installed on one output pipeline of the second cooling tower (15) and connected to the electric chiller (16). A twenty-fourth valve (V24) is installed on the other output pipeline of the second cooling tower (15) and connected to the third plate heat exchanger (14).

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