Waste heat recovery air conditioning control method and waste heat recovery air conditioner

Abstract

The application provides a waste heat recovery air conditioner control method and an air conditioner system. The method comprises the following steps: obtaining the ambient temperature of the waste heat recovery air conditioner; determining the operation mode of the waste heat recovery air conditioner based on the ambient temperature of the waste heat recovery air conditioner; determining the state of different valves in the waste heat recovery air conditioner according to the operation mode of the waste heat recovery air conditioner; and adjusting the state of a water pump assembly, the state of a compressor and the state of a supply fan in the waste heat recovery air conditioner in response to the state of the different valves in the waste heat recovery air conditioner. Therefore, the operation mode of the waste heat recovery air conditioner can be flexibly adjusted according to the ambient temperature of the waste heat recovery air conditioner, the waste heat recovery efficiency is improved, the heat interference is reduced, and the energy use efficiency of the server room is improved by adjusting the state of the different valves in the waste heat recovery air conditioner, the state of the water pump assembly, the state of the compressor and the state of the supply fan in the waste heat recovery air conditioner.

Description

Technical Field

[0001] This invention relates to air conditioning technology, and more particularly to a waste heat recovery air conditioning control method and a waste heat recovery air conditioner. Background Technology

[0002] Power Usage Effectiveness (PUE) is the ratio of total energy consumed by an internet data center (total load) to the energy consumed by IT equipment. It is a metric for measuring the energy efficiency of a data center. The closer the PUE value is to 1, the better the energy usage of the data center.

[0003] In related technologies, waste heat recovery is achieved through heat exchange. Specifically, the outdoor circulating water system of the indirect evaporative cooling chiller unit with the air-to-air heat exchange core is an open system, which does not support docking with the low-temperature closed circulating water system of the heat pump unit. Therefore, the waste heat recovery function of the data center cannot be realized in winter, resulting in the waste of heat energy in the data center during winter. At the same time, the series structure of the air-to-air heat exchange core and the DX condenser reduces the energy efficiency ratio of the core and the compressor, exacerbating the waste of waste heat and hindering the improvement of energy efficiency. Summary of the Invention In view of this, embodiments of the present invention provide a waste heat recovery air conditioning control method, a device, a superconducting quantum chip server, and a storage medium. The technical solution of the embodiments of the present invention is implemented as follows: This invention provides a waste heat recovery air conditioning control method, the method comprising: Obtain the ambient temperature of the waste heat recovery air conditioner; The operating mode of the waste heat recovery air conditioner is determined based on the ambient temperature. Based on the operating mode of the waste heat recovery air conditioner, determine the status of different valves in the waste heat recovery air conditioner; In response to the states of different valves in the waste heat recovery air conditioner, the states of the water pump assembly, the compressor, and the blower in the waste heat recovery air conditioner are adjusted.

[0004] The temperature thresholds for different operating modes of the waste heat recovery air conditioner in the above scheme are adjustable to adapt to different usage environments. Specifically, when the ambient wet-bulb temperature is 3°C (adjustable) < T ≤ 16°C (adjustable), the natural cooling source mode of the waste heat recovery air conditioner is triggered. When the ambient wet-bulb temperature is T > 16°C (adjustable), the natural cooling source and DX supplementary cooling hybrid mode of the waste heat recovery air conditioner are triggered. When the ambient wet-bulb temperature is T≤3°C (adjustable), the waste heat recovery mode of the waste heat recovery air conditioner is triggered.

[0005] In the above scheme, when the waste heat recovery air conditioner is in natural cooling source mode, by adjusting the state of different valves in the waste heat recovery air conditioner, on the internal circulation airflow side, the internal fan of the unit is turned on so that the hot return air from the computer room is cooled to the required temperature by the cooling water surface cooler and then sent into the server room for server cooling; on the external circulation water flow side, the internal water pump of the unit is turned on so that the low temperature cooling water absorbs the heat from the hot return air flow from the computer room when it flows through the unit's cooling water surface cooler, and then releases the heat into the atmosphere when it flows through the external heat exchange module; ultimately, the heat in the computer room is completely cooled and discharged naturally from the inside to the outside.

[0006] In the above scheme, when the waste heat recovery air conditioner is in a hybrid mode of natural cold source and DX supplementary cooling, the connection relationship between the condenser and the surface cooler is determined. Based on the connection relationship between the condenser and the surface cooler, by adjusting the state of different valves in the waste heat recovery air conditioner, on the internal circulation airflow side, by turning on the internal fan of the unit, the hot return airflow from the computer room first passes through the cooling water surface cooler for the first stage of cooling, and then passes through the DX evaporator for the second stage of cooling. Finally, after reaching the required temperature, it is sent to the server room for server cooling. On the external circulation water flow side, by turning on the internal water pump of the unit, the low-temperature cooling water absorbs heat from the hot return airflow from the computer room when it flows through the unit's cooling water surface cooler and DX condenser, and then releases the heat into the atmosphere when it flows through the external heat exchange module. Ultimately, the heat in the computer room is partially cooled by natural cooling and partially by mechanical cooling from the inside to the outside.

[0007] In the above scheme, when the waste heat recovery air conditioner is in waste heat recovery mode, the waste heat recovery demand ratio of the waste heat recovery mode is determined; based on the waste heat recovery ratio of the waste heat recovery mode, the state of different valves in the waste heat recovery air conditioner is determined. On the internal circulation airflow side, by turning on the internal fan of the unit, the hot return airflow from the computer room passes through the cooling water surface cooler for cooling. After reaching the required temperature, it is sent to the server room for server cooling. On the external circulation water flow side, by turning on the internal water pump of the unit, the low-temperature cooling water flows through the unit's cooling water surface cooler, absorbing the heat from the hot return airflow from the computer room, and then flows through the evaporator in the heat pump unit of the external waste heat recovery system to release part or all of the heat. The released heat, under the action of the waste heat recovery system, upgrades low-grade heat energy to high-grade heat energy, which is ultimately used for civil heating. Excess heat that cannot be absorbed by the waste heat recovery system is discharged into the atmosphere when the cooling water circulates to the external heat exchange module; ultimately, the effect of effectively recovering and utilizing computer room heat on demand and effectively releasing it naturally is achieved.

[0008] The method in the above scheme further includes: Based on the external environment of the server room, determine the wind speed parameters of the waste heat recovery air conditioner; When the wind speed parameter is greater than the wind speed threshold, the fan speed of the waste heat recovery air conditioner is reduced. When the gas temperature during the heat exchange process is greater than the air temperature threshold, the fan speed of the waste heat recovery air conditioner is increased.

[0009] The method in the above scheme further includes: Determine the energy efficiency of the server room based on its load. Based on the energy efficiency of the server room, the power of the fan in the waste heat recovery air conditioner is adjusted to improve the energy efficiency of the server room.

[0010] This invention also provides a waste heat recovery air conditioner, the waste heat recovery air conditioner comprising: A data center air handling module, wherein the data center air handling module includes: The DX cooling system is used to adjust the gas temperature during the internal heat exchange process. The surface cooler is used to dynamically adjust the gas temperature during the heat exchange process on the inner side and the gas temperature during the return air process of the computer room. A fan is used to adjust the gas flow rate during the heat exchange process on the inside. DX evaporator, used to adjust the amount of gas evaporation during the heat exchange process on the inner side; An outdoor heat exchange processing module, wherein the outdoor heat exchange processing module includes: Waste heat recovery pipe is used to receive heat from the heat exchange process on the outside of the waste heat recovery air conditioner; DX condensers are used to recover heat from server rooms through condensation processes.

[0011] This invention provides an embodiment that obtains the ambient temperature of the waste heat recovery air conditioner; determines the operating mode of the waste heat recovery air conditioner based on the ambient temperature; determines the state of different valves in the waste heat recovery air conditioner according to the operating mode; and adjusts the state of the water pump assembly, compressor, and blower in the waste heat recovery air conditioner in response to the state of the different valves. Therefore, the operating mode of the waste heat recovery air conditioner can be flexibly adjusted according to the ambient temperature. By adjusting the states of different valves, the water pump assembly, compressor, and blower in the waste heat recovery air conditioner, the waste heat recovery efficiency can be improved, thermal interference can be reduced, and the energy efficiency of the server room can be enhanced. Attached Figure Description

[0012] Figure 1 This is a schematic diagram illustrating a usage scenario of the waste heat recovery air conditioning control method provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the air conditioning unit structure in an embodiment of the present invention; Figure 3 This is a schematic diagram of the working process of an air conditioning unit according to the relevant technology in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the waste heat recovery air conditioner in an embodiment of the present invention; Figure 5 This is a schematic diagram of an optional control method for a waste heat recovery air conditioner in an embodiment of the present invention; Figure 6 This is a schematic diagram of the waste heat recovery air conditioning system connected to the water source heat pump unit in an embodiment of the present invention; Figure 7 This is a schematic diagram of the natural cooling source mode operation of the waste heat recovery air conditioner in an embodiment of the present invention; Figure 8 This is a schematic diagram of the operation of the waste heat recovery air conditioner in the hybrid mode of natural cold source and DX supplementary cooling in an embodiment of the present invention; Figure 9 This is a schematic diagram of the waste heat recovery mode of the waste heat recovery air conditioner in an embodiment of the present invention; Figure 10 This is a schematic diagram of the water tank configuration for the waste heat recovery air conditioner in an embodiment of the present invention; Figure 11 This is a schematic diagram of the operation of the waste heat recovery air conditioner in an embodiment of the present invention. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limitations on the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0015] Before providing a further detailed description of the embodiments of the present invention, the nouns and terms involved in the embodiments of the present invention will be explained, and the nouns and terms involved in the embodiments of the present invention shall be interpreted as follows.

[0016] 1) In response to, used to indicate the conditions or states on which the operation performed depends. When the conditions or states on which it depends are met, one or more operations performed may be performed in real time or with a set delay. Unless otherwise specified, there is no restriction on the order in which the multiple operations are performed.

[0017] 2) Based on, used to indicate the conditions or states on which the operation is performed depends. When the conditions or states on which it depends are met, one or more operations can be performed in real time or with a set delay. Unless otherwise specified, there is no restriction on the order in which the multiple operations are performed.

[0018] 3) Waste heat recovery: Waste heat recovery and utilization refers to the recovery and reuse of waste heat generated in industrial processes. The main technologies include heat exchange technology, heat-to-work conversion technology, and waste heat refrigeration and heating technology.

[0019] 4) DX compressor refrigeration, where DX refers to the air conditioning indoor cooling surface cooler that uses direct heat exchange between air and Freon evaporator. DX compressor refrigeration is a vapor compression refrigeration with compressor as the core component. Its heat exchanger mainly relies on direct heat exchange between air and Freon evaporator.

[0020] 5) Water cooling and air cooling are used to characterize whether the outdoor condenser of an air conditioner is cooled by water or by air. If it is cooled by water, it is called water cooling, and if it is cooled by air, it is called air cooling.

[0021] 6) Indirect evaporative cooling, characterized by the process of transferring the cooling capacity of the humid air (secondary air) obtained by direct evaporative cooling to the air to be treated (primary air) through a non-direct contact heat exchanger to achieve isohumid cooling of the air.

[0022] 7) The air heat exchange core, also known as the air heat exchanger, has heat exchange components as its core components. The indoor circulating air and the outdoor fresh air can exchange temperatures through the heat exchange components. When operating in winter, because the outdoor air temperature is lower than the indoor return air temperature, the indoor return air obtains cooling from the outdoor air through the heat exchange core, thus lowering the temperature and achieving a natural cooling effect.

[0023] 8) Data center energy efficiency (PUE) is an evaluation metric that is the ratio of all energy consumed by the data center to the energy consumed by the IT load. PUE = Total data center energy consumption / IT equipment energy consumption. The total data center energy consumption includes the energy consumption of IT equipment and the energy consumption of systems such as cooling and power distribution. A value greater than 1 indicates that the non-IT equipment consumes less energy, and the better the energy efficiency level.

[0024] 9) Cooling Load Factor (CLF) represents the ratio of power consumption of cooling equipment to power consumption of IT equipment in a data center. The smaller the value, the better the energy efficiency.

[0025] 10) Open system, which refers to whether the water in the refrigeration system is in contact with the outside. When it is in contact, it is an open system. The characteristics of an open system are that the water in the system is in contact with the outside air, or the water in the system is released or lost to the outside, and the system needs to be constantly replenished with water.

[0026] 11) Low-grade thermal energy: refers to thermal energy that is difficult to utilize. More heat can be released for every degree of reduction, but this energy is difficult to utilize, hence the name low-grade thermal energy. Conversely, high-grade thermal energy refers to thermal energy that is easy to utilize, such as coal combustion to heat circulating water for heating.

[0027] The waste heat recovery air conditioning control method provided in the embodiments of the present invention will be described below, wherein... Figure 1 This is a schematic diagram illustrating a usage scenario of the waste heat recovery air conditioning control method provided in an embodiment of the present invention. (See attached diagram.) Figure 1 In this context, a data center refers to a service platform with comprehensive equipment, professional management, and complete applications; it can also be called an Internet Data Center (IDC). Comprehensive equipment includes high-speed internet access bandwidth, high-performance local area networks, and a secure and reliable server room environment, such as IT equipment, cooling systems, lighting facilities, and backup power supplies. This equipment generates significant energy consumption. The energy efficiency measure for a data center is its Power Usage Effectiveness (PUE). By installing the waste heat recovery air conditioner provided in this application, the ambient temperature of the waste heat recovery air conditioner is obtained; based on the ambient temperature, the operating mode of the waste heat recovery air conditioner is determined; according to the operating mode, the status of different valves in the waste heat recovery air conditioner is determined; in response to the status of different valves in the waste heat recovery air conditioner, the status of the water pump components, the compressor, and the blower in the waste heat recovery air conditioner are adjusted, thereby realizing the recovery of waste heat from the server room and improving energy efficiency.

[0028] Before introducing the waste heat recovery air conditioning control method proposed in this application, we will first introduce the server room temperature control methods of related technologies. Specifically, refer to... Figure 2 , Figure 2 This is a schematic diagram of the air conditioning unit structure in an embodiment of the present invention. The heat treatment of the air conditioning unit structure is achieved through an indirect heat exchange core (i.e., an air-to-air heat exchange core) between outdoor air and indoor circulating air. Figure 3This is a schematic diagram of the working process of an air conditioning unit in an embodiment of the present invention. When the outdoor wet-bulb temperature (the lowest temperature achievable in the current environment solely through evaporation of moisture) is lower than the indoor hot return air temperature, the unit selectively applies forced circulating water spray (isenthalpic cooling) to the outdoor intake air, reducing the intake air temperature on the outdoor side of the core to near the outdoor wet-bulb temperature. When the two airflows of different temperatures flow through two airflow channels in different directions inside the core, heat is transferred through the high heat exchange rate plates of the core. Because the outdoor airflow temperature is lower than the indoor airflow temperature, the core effectively cools the indoor circulating air. At this time, the forced circulating water spray system on the outdoor side of the air-to-air heat exchange core is an open system. When the spray is activated, water absorbs heat through evaporation and carries away heat from the core through heat exchange. When the outdoor intake air temperature is below 0 degrees Celsius, to prevent the spray water on the outdoor side of the core from freezing and affecting the normal operation of the air-to-air heat exchange core, the spray water system is shut off. The core relies on the dry airflow temperature on both sides for heat exchange, achieving natural cooling in winter.

[0029] refer to Figure 4 , Figure 4 This is a schematic diagram of the structure of a waste heat recovery air conditioner in an embodiment of the present invention, wherein the waste heat recovery air conditioner includes the following structure: The computer room air handling module 401 specifically includes: DX cooling system 4011, surface cooler 4012, internal air supply fan 4013, DX evaporator 4014, bypass ventilation valve 4015, air outlet valve (installed at different locations on the air outlet wall depending on the environment, without specific limitations), filter 4017, and electric bypass valve 4018.

[0030] The outdoor heat exchange processing module 402 specifically includes: waste heat recovery pipe 4021 and DX condenser 4022.

[0031] Figure 4 During operation, the waste heat recovery air conditioner shown passes through the air handling unit 4012, bypass ventilation valve 4015, internal supply fan 4013, DX evaporator 4014, filter 4017 (preferably G4 grade), and outlet damper in sequence. The outlet damper is installed on the outlet wall according to the actual server room layout. The EC supply fan can be set to 6 or more units (the specific number can be adjusted according to the server room environment). When 6 units are set, 1 is a standby supply fan, and 5 are normal operating supply fans. The return air velocity in the server room is 3.3 m / s, and the supply air velocity is 1.9 m / s.

[0032] On the outdoor heat exchange side, the air intake of the outdoor heat exchange processing module 402 passes sequentially through the air intake filter, heat exchange core, spray device, water baffle device, and EC outdoor fan. Cooling water starts from the water tank and passes sequentially through the water pump assembly, surface cooler, electric three-way valve, DX condenser, and then returns to the spray device of the heat exchange module. The surface cooler and DX condenser can be operated in parallel or in series. During this process, four EC exhaust fans are provided, one as a standby exhaust fan (hot standby) and three as normal operating exhaust fans, with an external air intake velocity of 1.5 m / s.

[0033] Waste heat recovery air conditioning systems can include 1 to 4 independent DX supplementary cooling systems. Each DX supplementary cooling system includes major refrigeration components such as a compressor, condenser, EXV, and evaporator. Each compressor can operate at a variable frequency. The supply and return air temperatures in the computer room and the inlet and outlet water temperatures of the surface cooler in winter waste heat recovery mode are shown in Table 1.

[0034]

[0035] Table 1 Figure 4 The waste heat recovery air conditioner shown can be set to different operating modes during operation. When the ambient wet-bulb temperature is 3°C < T ≤ 16°C, the natural cooling source mode of the waste heat recovery air conditioner is triggered; when the ambient wet-bulb temperature is T > 16°C, the natural cooling source and DX supplementary cooling mixed mode of the waste heat recovery air conditioner is triggered; when the ambient wet-bulb temperature is T ≤ 3°C, the waste heat recovery mode of the waste heat recovery air conditioner is triggered. The temperature thresholds of different operating modes of the waste heat recovery air conditioner are adjustable to adapt to different usage environments. All of the above temperature thresholds are adjustable. The different operating modes are explained below.

[0036] Combination Figure 4 The structure of the waste heat recovery air conditioner shown is referenced. Figure 5 , Figure 5 This is a schematic diagram of an optional control method for a waste heat recovery air conditioner in an embodiment of the present invention. Figure 5 The waste heat recovery air conditioner shown can be controlled by its controller. The controller adjusts the state of different components within the waste heat recovery air conditioner, thereby controlling the change in its operating mode. The control method for the waste heat recovery air conditioner mainly includes the following steps: Step 501: The controller in the waste heat recovery air conditioner obtains the ambient temperature of the waste heat recovery air conditioner.

[0037] In some embodiments of the present invention, the ambient temperature of the waste heat recovery air conditioner can be obtained by sensors at a preset sampling period. This preset sampling period can be customized by the system, for example, it can be set to one minute, ten minutes, or one hour. Furthermore, the embedded controller can also collect target impact data of the server room environment through sensors. This target impact data includes, but is not limited to, environmental data, total energy consumption data of all devices in the data center, and energy consumption data of IT devices in the data center. The total energy consumption data of all devices in the data center can also be referred to as the total load, which includes the total power consumed by IT devices, cooling systems, lighting facilities, and backup power supplies. The energy consumption data of IT devices can also be referred to as the IT load, which includes the total power consumed by IT devices such as servers.

[0038] Step 502: The controller in the waste heat recovery air conditioner determines the operating mode of the waste heat recovery air conditioner based on the ambient temperature of the air conditioner.

[0039] Specifically, when the ambient wet-bulb temperature is 3°C < T ≤ 16°C, the natural cooling source mode of the waste heat recovery air conditioner is triggered; when the ambient wet-bulb temperature is T > 16°C, the natural cooling source and DX supplementary cooling mixed mode of the waste heat recovery air conditioner is triggered; and when the ambient wet-bulb temperature is T ≤ 3°C, the waste heat recovery mode of the waste heat recovery air conditioner is triggered.

[0040] Step 503: The controller in the waste heat recovery air conditioner determines the status of different valves in the waste heat recovery air conditioner according to the operating mode of the waste heat recovery air conditioner.

[0041] Combination Figure 4 In some embodiments of the present invention, a data center air handling module 401 is included, wherein the data center air handling module 401 comprises: The DX supplementary cooling system 4011 is used to adjust the gas temperature during the internal heat exchange process; the surface cooler 4012 is used to dynamically adjust the gas temperature during the internal heat exchange process and the gas temperature during the machine room return air process; the internal air supply fan 4013 is used to adjust the gas flow rate during the internal heat exchange process; and the DX evaporator 4014 is used to adjust the gas evaporation rate during the internal heat exchange process.

[0042] An outdoor heat exchange processing module 402, wherein the outdoor heat exchange processing module 402 includes: Waste heat recovery connector 4021 is used to receive heat from the heat exchange process on the outside of the waste heat recovery air conditioner; DX condenser 4022 is used to recover heat from the server room through condensation. Figure 4As shown, the waste heat recovery pipe side can reserve the supply and return water pipe ports on the evaporator side of the water source heat pump. When the computer room air handling module 401 is working, the computer room return air passes through the surface cooler 4012 in sequence, realizing heat exchange through the outer wall of the metal pipe to heat or cool the air, bypass ventilation valve 4015, embedded controller (EC Embedded Controller), internal air supply fan 4013, DX evaporator 4014, filter screen 4017 (preferably filter efficiency level G4), and air outlet damper.

[0043] In some embodiments of the present invention, the controller is connected to the DX cooling subsystem and the inner side fan respectively, and is used to control the gas flow rate in the outer heat exchange process according to the wind speed detection data. The controller selects feature data from all data collected by the sensors. The selectable feature data includes, but is not limited to: chiller current percentage, chiller evaporator small temperature difference, chiller condenser small temperature difference, chiller chilled water outlet temperature, cooling tower fan frequency conversion feedback, cooling tower cooling water outlet temperature, cooling pump frequency conversion feedback, chilled water pump frequency conversion feedback, outdoor average enthalpy, indoor average enthalpy, outdoor temperature, wet bulb temperature, outdoor humidity, and the open / closed status of the plate heat exchanger cooling side valve, etc. The air outlet damper is used to adjust the gas inlet direction in the inner heat exchange process according to the layout of the server room. The air outlet damper can be installed on the air outlet wall according to the actual server room layout. The embedded controller can be equipped with 6 fans, one of which serves as a backup fan to reduce the downtime rate of the waste heat recovery air conditioning system of this application. The preferred return air velocity in the computer room is 3.3 m / s, and the preferred supply air velocity is 1.9 m / s.

[0044] In some embodiments of the present invention, the waste heat recovery air conditioning system can be configured with two independent DX supplementary cooling systems. Each independent DX supplementary cooling system includes major refrigeration components such as a compressor, condenser, EXV, and evaporator. In order to improve energy efficiency, the compressor of each independent DX supplementary cooling system can be frequency-controlled to flexibly adjust the power of the compressor in each independent DX supplementary cooling system.

[0045] To further illustrate the process in step 503 of determining the state of different valves in the waste heat recovery air conditioner based on its operating mode, refer to... Figure 6 , Figure 6This is a schematic diagram of the waste heat recovery air conditioning system connected to a water source heat pump unit in an embodiment of the present invention. It includes: valves V1 (V1 manual valve 608), V2, V3, V4 (electric three-way valve 610), V5, V6, spray assembly 601, heat exchange core 602, electric valve 603, water tank 604, temperature sensor 605, water pump assembly 607, surface cooler 609, water outlet 611, condenser 612, variable frequency compressor 613, evaporator 614, filter 615, water pump 616, and water source heat pump unit 617, specifically including evaporator 6171 and condenser 6172. By connecting to the water source heat pump unit, the data center cooling unit can fully utilize external natural cold sources throughout the year, maximizing the reduction of air conditioning system energy consumption. It can also recover waste heat from the data center in winter for use in residential heating, thereby maximizing the utilization of waste heat from the server room. The component control for different operating modes is shown in Table 2.

[0046]

[0047] Table 2 In different operating modes, the cooling process and water flow direction in the waste heat recovery air conditioner can be flexibly controlled by controlling valves V1 (V1 manual valve 608), V2, V3, V4 (electric three-way valve 610), V5, and V6. After adjusting the state of different valves in the waste heat recovery air conditioner according to different operating modes, step 504 can be executed.

[0048] Step 504: The controller in the waste heat recovery air conditioner responds to the state of different valves in the waste heat recovery air conditioner and adjusts the state of the water pump assembly, the compressor and the blower in the waste heat recovery air conditioner.

[0049] The operation modes of waste heat recovery air conditioners will be further explained through different embodiments. The waste heat recovery air conditioner provided in this application includes three operating modes: when the ambient wet-bulb temperature is 3°C < T ≤ 16°C, the waste heat recovery air conditioner is in natural cooling source mode; when the ambient wet-bulb temperature is T > 16°C, the waste heat recovery air conditioner is in a hybrid mode of natural cooling source and DX supplementary cooling; and when the ambient wet-bulb temperature is T ≤ 3°C, the waste heat recovery air conditioner is in waste heat recovery mode.

[0050] In some embodiments of the present invention, when the waste heat recovery air conditioner is in natural cooling source mode, by adjusting the state of different valves in the waste heat recovery air conditioner, the circulating cooling water pump of the outdoor heat exchange processing module draws out cooling water, and the condensate of the cooling water is heated by the surface cooler to achieve waste heat discharge. (Refer to...) Figure 7 , Figure 7This is a schematic diagram illustrating the natural cooling source mode of the waste heat recovery air conditioner in this embodiment of the invention. Specifically, on the internal circulation airflow side, by turning on the internal fan of the unit, the hot return air from the computer room is cooled to the required temperature by the cooling water surface cooler and then sent into the server room for server cooling. On the external circulation water flow side, by turning on the internal water pump of the unit, the low-temperature cooling water absorbs heat from the hot return airflow from the computer room when it flows through the unit's cooling water surface cooler, and then releases the heat into the atmosphere when it flows through the external heat exchange module. Ultimately, this achieves the effect of complete natural cooling and discharge of heat from the inside to the outside of the computer room. The external heat exchange process is as follows: the circulating cooling water pump draws cooling water from the heat exchange module's water collection tank, heats it up by the surface cooler, and then returns it to the spray device of the heat exchange module. The spray device evenly sprays the high-temperature cooling water onto the heat exchange core, utilizing the latent heat of water evaporation to remove heat, and then collects it in the water collection tank after cooling. The low-humidity air is drawn in from the four air inlets of the heat exchange module, and after being heat-exchanged by the heat exchange core, it becomes high-humidity air and is then discharged into the atmosphere by the external exhaust fan.

[0051] Air handling process in the computer room: The high-temperature return air from the computer room enters the return air inlet of the unit after passing through the closed hot aisle. After being cooled by the surface cooler, it becomes low-temperature air and is then sent back to the computer room by the inner air supply fan after passing through the air supply filter.

[0052] In some embodiments of the present invention, when the waste heat recovery air conditioner is in a hybrid mode of natural cold source and DX supplementary cooling, the connection relationship between the condenser and the surface cooler is determined; based on the connection relationship between the condenser and the surface cooler, by adjusting the state of different valves in the waste heat recovery air conditioner, the circulating cooling water pump of the outdoor heat exchange processing module draws out cooling water, and the surface cooler heats the condensed cooling water to achieve waste heat discharge, and the gas temperature in the heat exchange process is adjusted through the DX supplementary cooling system. (Refer to...) Figure 8 , Figure 8 This is a schematic diagram illustrating the operation of the natural cooling source and DX supplementary cooling hybrid mode of the waste heat recovery air conditioner in this embodiment of the invention. On the external circulating water side, by activating the internal water pump, the low-temperature cooling water absorbs heat from the hot return airflow in the computer room as it flows through the unit's cooling water surface cooler and DX condenser. Then, as it flows through the external heat exchange module, the heat is released into the atmosphere. Ultimately, this achieves the effect of partially natural cooling and partially mechanical refrigeration of the computer room's heat from the inside out. Specifically, the external heat exchange process is as follows: the circulating cooling water pump draws cooling water from the heat exchange module's water collection tank, heats it through the surface cooler, and returns it to the spray device of the heat exchange module. The spray device evenly sprays the high-temperature cooling water onto the heat exchange core, utilizing the latent heat of water evaporation to remove heat, and after cooling, the water collects in the water collection tank. The low-humidity air from the outside is drawn in through the four air inlets of the heat exchange module, undergoes heat exchange in the heat exchange core, becomes high-humidity air, and is then discharged into the atmosphere by the external exhaust fan.

[0053] On the internal circulation airflow side, by activating the internal fans of the unit, the hot return air from the computer room first undergoes primary cooling via a cooling water surface cooler, and then undergoes secondary cooling via a DX evaporator. Once the required temperature is reached, it is then delivered to the server room for server cooling. Specifically, the computer room air handling process includes: the high-temperature return air from the computer room enters the unit's return air vent after passing through a closed hot aisle, is cooled by the surface cooler to become low-temperature air, and is then sent back to the computer room by the internal supply fan after passing through the air filter. Simultaneously, the DX supplementary cooling system operates, with the refrigerant returning to the compressor after compression, condensation, and throttling evaporation. After initial cooling by the surface cooler, the computer room return air is further cooled to the target supply air temperature by the DX supplementary cooling system evaporator, and then sent back to the computer room by the internal supply fan after passing through the air filter. This achieves better temperature control by adjusting the gas temperature during the heat exchange process through the DX supplementary cooling system.

[0054] In some embodiments of the present invention, when the waste heat recovery air conditioner is in waste heat recovery mode, the waste heat recovery demand ratio of the waste heat recovery mode is determined; based on the waste heat recovery demand ratio of the waste heat recovery mode, the state of different valves in the waste heat recovery air conditioner is determined; and waste heat is discharged by heating the chilled water in the water source heat pump unit connected to the waste heat recovery air conditioner. (Referring to...) Figure 9 , Figure 9 This is a schematic diagram illustrating the operation of the waste heat recovery mode of the waste heat recovery air conditioner in this embodiment of the invention. Only the surface cooler and the internal air supply fan are operational in the waste heat recovery air conditioner. Chilled water from the external water source heat pump evaporator is heated by the surface cooler and then returned to the water source heat pump evaporator, completing the cooling process and meeting the operational requirements of the water source heat pump system. High-temperature return air from the server room is cooled to the target supply air temperature by the surface cooler, filtered, and then sent back to the server room by the internal air supply fan. During this process, the circulating water pump and DX system (including compressor, condenser, refrigeration components, etc.) can be installed outside the waste heat recovery air conditioner, facilitating maintenance and not affecting the normal operation of the waste heat recovery air conditioner and the server room.

[0055] In this waste heat recovery air conditioning system, only the surface cooler and the internal air supply fan are operational. Chilled water from the external water source heat pump evaporator is heated by the surface cooler and then returned to the evaporator, completing the cooling process and meeting the operational requirements of the water source heat pump system. High-temperature return air from the server room is cooled to the target supply air temperature by the surface cooler, filtered, and then sent back to the server room by the internal air supply fan. During this process, an electric bypass valve can be opened according to the server room load requirements to reduce the power consumption of the internal air supply fan and improve the server room's power usage effectiveness (PUE).

[0056] When the waste heat recovery air conditioner is in waste heat recovery mode, the waste heat recovery demand ratio of the waste heat recovery mode is first determined. Then, based on the waste heat recovery demand ratio of the waste heat recovery mode, the status of different valves in the waste heat recovery air conditioner is determined. On the internal circulation airflow side, by turning on the internal fan of the unit, the hot return airflow from the computer room passes through the cooling water surface cooler for cooling. After reaching the required temperature, it is sent to the server room for server cooling. On the external circulation water flow side, by turning on the internal water pump of the unit, the low-temperature cooling water flows through the unit's cooling water surface cooler, absorbing the heat from the hot return airflow from the computer room. Then, it flows through the evaporator in the heat pump unit of the external waste heat recovery system to release some or all of the heat. The released heat, under the action of the waste heat recovery system, upgrades low-grade heat energy to high-grade heat energy, which is ultimately used for civil heating. Excess heat that cannot be absorbed by the waste heat recovery system is discharged into the atmosphere when the cooling water circulates to the external heat exchange module. Ultimately, the effect of effectively recovering and utilizing computer room heat on demand and effectively releasing it naturally is achieved.

[0057] When in waste heat recovery mode, the cooling water system of the external heat exchange module of the waste heat recovery air conditioning system does not operate. When the ambient temperature is below 0℃, the cooling water system must be drained for freeze protection. The chilled water system, composed of the unit's surface cooler and the evaporator of the water source heat pump system, can be configured with winter freeze protection measures, such as: pipe electric heat tracing (after the electric heat tracing tape is connected to the power supply, the electrical energy heats the conductive material, and its resistance increases accordingly. When the core temperature rises to a certain value, the resistance becomes so high that it almost blocks the current, and the temperature no longer rises. At the same time, the electric heat tracing tape transfers heat to the lower-temperature heated system), water temperature detection alarm, etc., to prevent the chilled water system from freezing and causing damage to the waste heat recovery air conditioning system when the machine room is operating under low load conditions.

[0058] In some embodiments of the present invention, when the waste heat recovery air conditioner is in waste heat recovery mode, the airflow parameters of the waste heat recovery air conditioner can be dynamically adjusted. The airflow parameters can be determined based on the external environment of the server room. When the airflow parameters are greater than a threshold, the fan speed of the waste heat recovery air conditioner is reduced. When the gas temperature during the heat exchange process is greater than an air temperature threshold, the fan speed of the waste heat recovery air conditioner is increased. The fans of the waste heat recovery air conditioner can include an inner fan (exhaust) and an outer fan (intake). When the airflow parameters are greater than the threshold, the outer fan speed is lower, reaching 1.5 m / s, to reduce the power consumption of the outer fan. When the gas temperature during the heat exchange process is greater than the air temperature threshold, it indicates that the temperature inside the server room is high, so the speed of the inner fan of the waste heat recovery air conditioner is increased to accelerate exhaust. The speed of the outer fan can also be increased simultaneously to accelerate intake. To reduce the power consumption of the inner fan, the inner fan can adopt a fan wall design with a lower supply airflow speed, reaching 1.9 m / s, which is sufficient.

[0059] In some embodiments of the present invention, the energy efficiency of the server room can be determined based on the server room load; based on the energy efficiency of the server room, the power of the fan in the waste heat recovery air conditioner can be adjusted to improve the energy efficiency of the server room. Since the server room load changes continuously with the number of servers and the volume of business in the server room, adjusting the power of the fan in the waste heat recovery air conditioner based on the energy efficiency of the server room can both meet the high-load business of the server room and reduce the power consumption of the waste heat recovery air conditioner when the server room load decreases, thereby reducing power consumption and improving the corresponding energy efficiency.

[0060] In some embodiments of the present invention, reference is made to Figure 10 , Figure 10 This is a schematic diagram of the water tank configuration for a waste heat recovery air conditioner in an embodiment of the present invention. When the waste heat recovery air conditioner is in waste heat recovery mode, the waste heat recovery demand ratio of the waste heat recovery mode is determined. Based on the waste heat recovery demand ratio of the waste heat recovery mode, the state of different valves in the waste heat recovery air conditioner is determined. By heating the chilled water in the water source heat pump unit connected to the waste heat recovery air conditioner, drainage and water replenishment are required during this process. The waste heat recovery air conditioner can be configured with dual water tanks A and B. The water receiving tray is controlled by electric valves through two connecting pipes to allow the water in the receiving tray to flow separately. When the unit detects that the cooling water conductivity is too high and water needs to be replaced, it first closes the inlet and outlet electric valves of water tank A, and only uses water tank B for circulation. Water tank A is drained and replenished with new water. After water tank A completes the water replacement operation, it is opened to add water tank A to the system circulation. Then, the inlet and outlet electric valves of water tank B are closed, and water tank B is drained and replenished with new water again. After water tank B completes the water replacement operation, it is added to the system circulation. In this way, the wastewater is drained and new water is added alternately in one go, preventing the mixing of wastewater and new water and saving water consumption during the operation of the waste heat recovery air conditioner.

[0061] In some embodiments of the present invention, when the space in the server room cannot support the configuration of dual water tanks, the main and backup units of multiple waste heat recovery air conditioners can be rotated for sewage discharge and water replacement. Specifically, when a unit detects that sewage discharge is required, the control unit first turns on the backup unit, and then shuts down the unit that needs sewage discharge. After the unit is shut down, all the sewage in the water pan is emptied at once, and then it is refilled with new water to wait for the next rotation before being put into use. In this way, the water pan of the backup unit can be emptied in rotation, reducing the water consumption during the operation of the waste heat recovery air conditioner.

[0062] To facilitate understanding of the waste heat recovery air conditioning control method provided by this invention, the following explanation is based on test data. Taking Beijing as an example, Table 3 shows the mid-wet-bulb temperature parameters calculated based on recent climate data for the Beijing area. The annual average SCOP for the waste heat recovery air conditioning system is 12.52. During the heating season from October 15th to March 15th, the waste heat recovery air conditioning system operates in waste heat recovery mode, with only the internal fan running.

[0063]

[0064] Table 3 Taking a server room with a configuration of 5KW / rack, totaling 52 racks and a total power of 260KW as the test environment, and using the waste heat recovery air conditioner provided in this application and the waste heat recovery air conditioner control method provided in this application as an example, referring to Table 4, the annual air conditioner CLF value is 0.099. Table 5 shows the PUE analysis parameters of the waste heat recovery air conditioner under different operating modes. The unit's annual natural cooling source operating time accounts for 71.22%, the unit's air conditioner factor power consumption coefficient is 0.099, and the overall PUE value of the data center can reach a high energy efficiency level of 1.159.

[0065] Project PUE = 1 (IT) + 0.099 (Air Conditioning Factor) + 0.06 (Other Combined Power Consumption) = 1.159

[0066] Table 4

[0067] Table 5 Figure 11 This is a schematic diagram of the operation of the waste heat recovery air conditioner in an embodiment of the present invention, for reference. Figure 11As another possible implementation of the present invention, when the waste heat recovery air conditioner is in waste heat recovery mode, the inlet and outlet water pipes of the waste heat recovery can be connected to the outlet side of the cooling water surface cooler, and a three-way valve V8 and a bypass pipe are installed on the inlet water pipe of the outer heat exchange module. When the waste heat recovery mode is used in winter, the water passing through the cooling water surface cooler is heated by the air in the server room, and then passes through the evaporator of the water source heat pump unit. After the heat is carried away by the evaporator, the water temperature drops and returns to the unit inlet. At this time, the bypass valve V5 between the inlet and outlet is in the closed state. If the heat pump can remove 100% of the waste heat absorbed by the surface cooler, and the heat pump outlet water temperature reaches the ideal inlet water temperature of the unit's surface cooler, then it is not necessary to turn on the fan of the external heat exchange module. Instead, the cooling water bypasses the heat exchange module by opening the bypass electric three-way valve V8 of the external heat exchange module. Otherwise, when the heat pump outlet water temperature is higher than the set temperature required by the unit's surface cooler, the bypass electric three-way valve V8 of the external heat exchange module is closed, allowing the cooling water to undergo secondary heat dissipation through the heat exchange module until it reaches the set temperature of the surface cooler before entering the surface cooler.

[0068] Among them, by connecting the water source heat pump unit, it is ensured that the data center cooling unit makes full use of the external natural cold source throughout the year, minimizing the energy consumption of the air conditioning system. At the same time, it can also recover the waste heat of the data center in winter and use it for residential heating, so as to maximize the utilization of the waste heat of the server room. The component control of different operating modes is shown in Table 6.

[0069] Table 6

[0070] Beneficial technical effects: This invention provides the following beneficial technical effects by acquiring the ambient temperature of the waste heat recovery air conditioner; determining the operating mode of the waste heat recovery air conditioner based on the ambient temperature; determining the state of different valves in the waste heat recovery air conditioner according to the operating mode; and adjusting the state of the water pump assembly, compressor, and blower in the waste heat recovery air conditioner in response to the state of the different valves. 1) Compared with the open-loop system of the outdoor circulating water system of the indirect evaporative cooling chiller unit with the air-to-air heat exchange core in the related technology, which does not support the docking with the low-temperature closed circulating water system of the heat pump unit and cannot realize waste heat recovery in winter, this application can make full use of the waste heat of the server room and realize the waste heat recovery and use in winter.

[0071] 2) Compared to related technologies where the air-to-air heat exchange core and DX condenser on the outdoor side of the air-to-air heat exchange core unit are connected in series, causing the energy efficiency ratios of the core and compressor to cancel each other out when the existing outdoor airflow series connection method is used, thus affecting energy efficiency, this application can improve waste heat recovery efficiency, reduce thermal interference, and improve the energy efficiency of the server room. The above description is merely an embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A waste heat recovery air conditioning control method, characterized in that, The method includes: Obtain the ambient temperature of the waste heat recovery air conditioner; Based on the operating mode of the waste heat recovery air conditioner, the state of different valves in the waste heat recovery air conditioner is determined. The determination of the state of different valves in the waste heat recovery air conditioner based on the operating mode includes: solving the state of different valves based on a preset valve position status table and the parallel / series switching relationship of 'surface cooler - DX condenser', according to the target table obtained by the operating mode and the proportion of waste heat recovery demand. When the waste heat recovery air conditioner is in waste heat recovery mode, determining the state of different valves in the waste heat recovery air conditioner according to its operating mode includes: determining the state of different valves in the waste heat recovery air conditioner based on the waste heat recovery demand ratio of the waste heat recovery mode; on the internal circulation airflow side, by turning on the fan of the waste heat recovery air conditioner, the hot return airflow from the machine room is cooled by passing through the cooling water surface cooler; on the external circulation water flow side, by connecting the cooling water system of the waste heat recovery air conditioner to the evaporator in the heat pump unit, the cooling water flows through the cooling water surface cooler to absorb the heat from the machine room, and then enters the evaporator in the heat pump unit, upgrading the low-grade heat energy to high-grade heat energy; When the outlet water temperature of the heat pump is not higher than the inlet water temperature set for the cooling water surface cooler, the fan of the outer heat exchange module is not turned on, and the bypass electric three-way valve of the outer heat exchange module is turned on, so that the cooling water bypasses the outer heat exchange module through the bypass pipeline; when the outlet water temperature of the heat pump is higher than the inlet water temperature set for the cooling water surface cooler, the bypass electric three-way valve of the outer heat exchange module is turned off, so that the cooling water flows through the outer heat exchange module for heat dissipation, and enters the cooling water surface cooler after reaching the temperature set for the cooling water surface cooler. In response to the state of different valves in the waste heat recovery air conditioner, the state of the water pump assembly, the state of the compressor, and the state of the blower in the waste heat recovery air conditioner are adjusted. When the waste heat recovery air conditioner is in waste heat recovery mode, during the heating of the cooling water in the heat pump unit, the sewage discharge and fresh water replenishment operations are performed alternately for each of the two water tanks. When the waste heat recovery air conditioner is in a hybrid mode of natural cold source and DX supplementary cooling, on the external circulating water side, by turning on the internal water pump of the unit, the cooling water absorbs heat from the hot return airflow in the computer room when it flows through the cooling water surface cooler and the DX condenser, and then releases the heat into the atmosphere when it flows through the external heat exchange module.

2. The waste heat recovery air conditioning control method according to claim 1, characterized in that, Determining the status of different valves in the waste heat recovery air conditioner according to its operating mode includes: When the waste heat recovery air conditioner is in natural cooling source mode, by adjusting the state of different valves in the waste heat recovery air conditioner, the internal fan of the waste heat recovery air conditioner is turned on on the internal circulation airflow side, and the water pump assembly of the waste heat recovery air conditioner is turned on on the external circulation water flow side, so that the heat in the machine room is naturally cooled and discharged from the inside to the outside.

3. The waste heat recovery air conditioning control method according to claim 1, characterized in that, Determining the status of different valves in the waste heat recovery air conditioner according to its operating mode includes: When the waste heat recovery air conditioner is in a hybrid mode of natural cold source and DX supplementary cooling, determine the connection relationship between the DX condenser and the cooling water surface cooler. Based on the connection relationship between the DX condenser and the cooling water surface cooler, by adjusting the state of different valves in the waste heat recovery air conditioner, on the internal circulation airflow side, the unit's internal fan is turned on to achieve the first stage of cooling using the cooling water surface cooler, and the second stage of cooling is achieved through the DX evaporator.

4. The waste heat recovery air conditioning control method according to claim 1, characterized in that, The method further includes: Based on the external environment of the server room, determine the wind speed parameters of the waste heat recovery air conditioner; When the wind speed parameter is greater than the wind speed threshold, the fan speed of the waste heat recovery air conditioner is reduced. When the gas temperature during the heat exchange process is greater than the air temperature threshold, the fan speed of the waste heat recovery air conditioner is increased.

5. The waste heat recovery air conditioning control method according to claim 1, characterized in that, The method further includes: Determine the energy efficiency of the server room based on its load. Based on the energy efficiency of the server room, the power of the fan in the waste heat recovery air conditioner is adjusted to improve the energy efficiency of the server room.

6. A waste heat recovery air conditioner, wherein the waste heat recovery air conditioner is used in a server room, characterized in that, When the waste heat recovery air conditioner is in waste heat recovery mode, the state of different valves in the waste heat recovery air conditioner is determined based on the waste heat recovery demand ratio of the waste heat recovery mode; on the internal circulation airflow side, the hot return airflow from the machine room is cooled by passing it through the cooling water surface cooler by turning on the fan of the waste heat recovery air conditioner; on the external circulation water flow side, the cooling water system of the waste heat recovery air conditioner is connected to the evaporator in the heat pump unit, so that the cooling water flows through the cooling water surface cooler to absorb the heat of the machine room, and then enters the evaporator in the heat pump unit to upgrade the low-grade heat energy to high-grade heat energy; when When the outlet water temperature of the heat pump is not higher than the inlet water temperature set for the cooling water surface cooler, the fan of the outer heat exchange module is not turned on, and the bypass electric three-way valve of the outer heat exchange module is turned on, so that the cooling water bypasses the outer heat exchange module through the bypass pipeline; when the outlet water temperature of the heat pump is higher than the inlet water temperature set for the cooling water surface cooler, the bypass electric three-way valve of the outer heat exchange module is turned off, so that the cooling water flows through the outer heat exchange module for heat dissipation, and enters the cooling water surface cooler after reaching the temperature set for the cooling water surface cooler. During the heating process of the cooling water in the heat pump unit, the sewage discharge and fresh water replenishment operations are performed alternately for each of the two water tanks. When the waste heat recovery air conditioner is in a hybrid mode of natural cold source and DX supplementary cooling, on the external circulation water side, by turning on the internal water pump of the unit, the cooling water absorbs the heat from the hot return airflow of the computer room when it flows through the cooling water surface cooler and DX condenser, and then discharges the heat into the atmosphere when it flows through the external heat exchange module. The waste heat recovery air conditioner includes: A data center air handling module, wherein the data center air handling module includes: The DX cooling system is used to adjust the gas temperature during the internal heat exchange process. The surface cooler is used to dynamically adjust the gas temperature during the heat exchange process on the inner side and the gas temperature during the return air process of the computer room. A fan is used to adjust the gas flow rate during the heat exchange process on the inside. DX evaporator, used to adjust the amount of gas evaporation during the heat exchange process on the inner side; An outdoor heat exchange processing module, wherein the outdoor heat exchange processing module includes: Waste heat recovery pipe is used to receive heat from the heat exchange process on the outside of the waste heat recovery air conditioner; DX condensers are used to recover heat from server rooms through condensation processes.

7. The waste heat recovery air conditioner according to claim 6, characterized in that, The waste heat recovery air conditioner also includes: The controller is connected to the DX cooling system and the inner fan respectively, and is used to control the gas flow rate during the heat exchange process on the outer side based on the wind speed detection data.

8. The waste heat recovery air conditioner according to claim 6, characterized in that, The computer room air handling module also includes: An air outlet damper is used to adjust the direction of airflow during the heat exchange process inside the server room, according to the layout of the server room.

9. The waste heat recovery air conditioner according to claim 6, characterized in that, When the waste heat recovery air conditioner is in natural cooling source mode, by adjusting the state of different valves in the waste heat recovery air conditioner, the fan of the waste heat recovery air conditioner is turned on on the internal circulation airflow side, and the water pump assembly of the waste heat recovery air conditioner is turned on on the external circulation water flow side, so that the heat in the machine room is naturally cooled and discharged from the inside to the outside.

10. The waste heat recovery air conditioner according to claim 6, characterized in that, When the waste heat recovery air conditioner is in a hybrid mode of natural cold source and DX supplementary cooling, the connection relationship between the DX condenser and the cooling water surface cooler is determined. Based on the connection relationship between the DX condenser and the cooling water surface cooler, by adjusting the state of different valves in the waste heat recovery air conditioner, on the internal circulation airflow side, the unit's internal fan is turned on to achieve the first stage of cooling using the cooling water surface cooler, and the second stage of cooling is achieved through the DX evaporator.

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