HVAC system for nuclear power plants and HVAC adjustment method for nuclear power plants

Abstract

The present application relates to the technical field of HVAC for nuclear power plant units, and in particular to an HVAC system for nuclear power plants and an HVAC adjustment method for nuclear power plants. In the embodiments of the present application, cooling operations need to be executed on a plurality of buildings of a target nuclear power plant by means of building HVAC devices, so as to create a cooling effect experienced by the buildings; and by means of a plant site temperature measurement module, temperature measurement is performed on an environmental area where the target nuclear power plant is located, so as to obtain a plant site temperature. Furthermore, cold source supply subsystems and the building HVAC devices are controlled on the basis of the plant site temperature to adjust the cooling effect experienced by the buildings. It should be noted that, thanks to temperature measurement performed by a plant site temperature measurement module on an environmental area where a target nuclear power plant is located, a plant site temperature can be acquired, and therefore cold source supply subsystems and building HVAC devices are further controlled on the basis of the plant site temperature to adjust a cooling effect experienced by buildings. Thus, it is possible to adapt to temperature changes in an environment where a nuclear power plant is located during HVAC operations, thereby reducing energy waste.

Description

Nuclear power plant heating ventilation system and nuclear power plant heating ventilation adjusting method TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear power plant unit heating ventilation, in particular to a nuclear power plant heating ventilation system and a nuclear power plant heating ventilation adjusting method. BACKGROUND

[0002] "heating ventilation" is the abbreviation of heating, ventilation and air conditioning (HVAC). It refers to a complete set of systems for controlling and maintaining the environmental conditions in a building or a specific space. It can be understood that the heating ventilation system applied to the nuclear power plant is responsible for maintaining the temperature, humidity and air quality of each area inside the nuclear power plant, which is a key link to ensure the stable operation of the nuclear power plant equipment, maintain the safety of the nuclear power plant and improve the overall operation efficiency.

[0003] In the related art, the heating ventilation system of the nuclear power plant needs to combine manual configuration operation mode and local automatic regulation flow to realize temperature regulation. After power failure, the operator needs to manually configure the nuclear power plant to provide cooling for the plant building in multiple subsystems of the heating ventilation system. The internal heating ventilation system adjusts the air volume according to the inlet air temperature, plant capacity and the like to achieve the control of the environmental temperature of the plant equipment. This way is difficult to adapt to the temperature change of the environment where the nuclear power plant is located during the operation process, and is easy to cause energy waste. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a nuclear power plant heating ventilation system and a nuclear power plant heating ventilation adjusting method, which can adapt to the temperature change of the environment where the nuclear power plant is located during the heating ventilation operation process, and reduce energy waste.

[0005] The nuclear power plant heating ventilation system according to the first aspect of the present application is applied to a target nuclear power plant, and the target nuclear power plant includes multiple plant buildings, which includes:

[0006] a site temperature measuring module for measuring the site temperature of the environment region where the target nuclear power plant is located;

[0007] a plant building heating ventilation device, each plant building is provided with a corresponding plant building heating ventilation device;

[0008] a cold source supply subsystem including a cold source supply device, a liquid cooling unit and an air cooling unit, the cold source supply device is used to deliver cold source for the plant building heating ventilation device, the liquid cooling unit is used to provide liquid coolant for the cold source supply device, and the air cooling unit is used to provide gas coolant for the cold source supply device.

[0009] According to some embodiments of the present application, the nuclear power plant heating ventilation system further includes:

[0010] an off-site power supply detection module configured to detect an off-site power supply of the target nuclear power plant;

[0011] Each of the liquid cooling units is configured with a corresponding emergency power generation module;

[0012] The emergency power generation module is configured to, in a case where the off-site power supply detection module detects an abnormal power supply of the off-site power supply, if the site temperature is higher than a temperature threshold, start the emergency power generation module to provide backup power supply for the liquid cooling unit.

[0013] According to some embodiments of the present application, the nuclear power plant heating and ventilation system further comprises:

[0014] Each of the liquid cooling units is further configured with a corresponding station black start power generation module, and the station black start power generation module is coupled to the air cooling unit;

[0015] The station black start power generation module is configured to, in a case where the off-site power supply detection module detects an abnormal power supply of the off-site power supply and the emergency power generation module has an abnormal power supply, if the site temperature is higher than the temperature threshold, start the station black start power generation module to provide backup power supply for the air cooling unit.

[0016] According to some embodiments of the present application, the cold source supply subsystem comprises at least two rows of liquid cooling units;

[0017] The air cooling unit is configured to, in a case where the off-site power supply detection module detects an abnormal power supply of the off-site power supply and at least two rows of the liquid cooling units have an abnormal power supply of the emergency power generation module, if the site temperature is higher than the temperature threshold, start the air cooling unit to provide cooling for the plant building.

[0018] According to the nuclear power plant heating and ventilation adjustment method of the second aspect of the present application, the nuclear power plant heating and ventilation system of the first aspect of the present application is applied, and the method comprises:

[0019] Performing refrigeration operation on multiple plant buildings of the target nuclear power plant by plant building heating and ventilation equipment to form a refrigeration influence on the plant buildings;

[0020] Measuring the temperature of the environmental area of the target nuclear power plant by a site temperature measurement module to obtain a site temperature;

[0021] Based on the site temperature, controlling the cold source supply subsystem and the plant building heating and ventilation equipment to adjust the refrigeration influence on the plant buildings.

[0022] According to some embodiments of the present application, the controlling the cold source supply subsystem and the plant HVAC to adjust the fresh air cooling effect on the plant based on the plant site temperature comprises:

[0023] In response to the plant site temperature being higher than the predetermined temperature threshold, controlling the cold source supply subsystem to perform a cold source supply operation on the plant HVAC, and controlling the plant HVAC to perform a fresh air cooling operation on the plant to adjust the fresh air cooling effect on the plant.

[0024] According to some embodiments of the present application, the nuclear power plant HVAC system further comprises a plant external power supply detection module configured to detect a plant external power supply of the target nuclear power plant, and each of the liquid cooling units is configured with a corresponding emergency power generation module.

[0025] Before the controlling the cold source supply subsystem to perform a cold source supply operation on the plant HVAC, and controlling the plant HVAC to perform a fresh air cooling operation on the plant to adjust the fresh air cooling effect on the plant, the method further comprises:

[0026] In the case that the plant external power supply detection module detects that the plant external power supply is abnormal, if the plant site temperature is higher than the temperature threshold, starting the emergency power generation module to provide backup power supply for the liquid cooling unit.

[0027] According to some embodiments of the present application, the nuclear power plant HVAC system further comprises that each of the liquid cooling units is further configured with a corresponding station black start power generation module, and the station black start power generation module is coupled to the air cooling unit.

[0028] Before the controlling the cold source supply subsystem to perform a cold source supply operation on the plant HVAC, and controlling the plant HVAC to perform a fresh air cooling operation on the plant to adjust the fresh air cooling effect on the plant, the method further comprises:

[0029] In the case that the plant external power supply detection module detects that the plant external power supply is abnormal, and the emergency power generation module is abnormal, if the plant site temperature is higher than the temperature threshold, starting the station black start power generation module to provide backup power supply for the air cooling unit.

[0030] According to some embodiments of the present application, the cold source supply subsystem comprises at least two rows of the liquid cooling units.

[0031] Before the controlling the cold source supply subsystem to perform a cold source supply operation on the plant HVAC, and controlling the plant HVAC to perform a fresh air cooling operation on the plant to adjust the fresh air cooling effect on the plant, the method further comprises:

[0032] In the case that the off-site power supply detection module detects that the off-site power supply is abnormal, and at least two rows of the liquid cooling units have the abnormal power supply of the emergency power generation module, if the site temperature is higher than the temperature threshold, the air cooling unit is started to supply cooling for the plant.

[0033] According to some embodiments of the present application, the method further comprises:

[0034] In response to the site temperature being lower than the predetermined temperature threshold, the cold source supply system is controlled to perform a cold source shutdown operation on the plant HVAC equipment, and the plant HVAC equipment is controlled to perform a fresh air cooling operation on the plant to adjust the fresh air cooling effect on the plant.

[0035] The nuclear power plant HVAC system and the nuclear power plant HVAC adjustment method according to the embodiments of the present application have at least the following beneficial effects:

[0036] The embodiments of the present application need to perform a refrigeration operation on multiple plants of the target nuclear power plant by the plant HVAC equipment to form a refrigeration effect on the plants, and the site temperature is measured by the site temperature measurement module for the environment of the target nuclear power plant to obtain the site temperature. Further, the cold source supply system and the plant HVAC equipment are controlled based on the site temperature to adjust the refrigeration effect on the plants. It should be noted that the site temperature can be obtained by the temperature measurement of the site temperature measurement module for the environment of the target nuclear power plant, and therefore the cold source supply system and the plant HVAC equipment are further controlled based on the site temperature to adjust the refrigeration effect on the plants. In this way, the temperature change of the environment of the nuclear power plant during the HVAC operation can be adapted, and energy waste can be reduced.

[0037] Additional aspects and advantages of the present application will be made apparent by the following description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0038] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the accompanying drawings, in which:

[0039] FIG. 1 is a schematic diagram of a nuclear power plant HVAC system according to an embodiment of the present application;

[0040] FIG. 2 is a flowchart of a nuclear power plant HVAC adjustment method according to an embodiment of the present application;

[0041] FIG. 3 is a flowchart of a nuclear power plant HVAC adjustment method according to an embodiment of the present application;

[0042] Fig. 4 is a flow diagram of a method for adjusting a heating and ventilation system of a nuclear power plant according to an embodiment of the present application;

[0043] Fig. 5 is a flow diagram of a method for adjusting a heating and ventilation system of a nuclear power plant according to an embodiment of the present application;

[0044] Fig. 6 is a flow diagram of a method for adjusting a heating and ventilation system of a nuclear power plant according to an embodiment of the present application;

[0045] Fig. 7 is a detailed schematic diagram of a heating and ventilation system of a nuclear power plant according to an embodiment of the present application;

[0046] Fig. 8 is a schematic diagram of a hardware structure of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0047] Embodiments of the present application are described in detail below with reference to the attached drawings. The embodiments described below are examples of the present application and are not intended to limit the present application. The same or similar components are denoted by the same or similar reference numerals throughout the drawings.

[0048] In the description of the present application, the meaning of a plurality of is one or more, the meaning of multiple is two or more, greater than, less than, more than, and the like are understood as not including the number itself, above, below, within, and the like are understood as including the number itself. If it is described as first, second, etc., it is only for the purpose of distinguishing the technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0049] In the description of the present application, it is to be understood that, in relation to the positional description, the position or location relationship indicated by terms such as upper, lower, left, right, front, back, etc. is based on the position or location relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as limiting the present application, which indicates or implies that the device or element referred to must have a specific position, be constructed and operated in a specific position.

[0050] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0051] In the description of this application, it should be noted that, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly. Those skilled in the art can reasonably determine the specific meaning of the above terms in this application based on the specific content of the technical solution. Furthermore, the identification of specific steps in the following text does not imply a limitation on the order of steps or execution logic. The execution order and logic between each step should be understood and inferred from the content described in the embodiments.

[0052] "HVAC" is an abbreviation for Heating, Ventilation, and Air Conditioning. It refers to a complete system used to control and maintain environmental conditions within a building or specific space. Heating provides heat to keep the interior warm, typically used in winter or cold regions; ventilation maintains indoor air quality by introducing fresh air and expelling polluted air, ensuring good air quality and suitable humidity levels; and air conditioning regulates indoor temperature and humidity to provide a comfortable indoor environment.

[0053] The heating, ventilation, and air conditioning (HVAC) system used in nuclear power plants is responsible for maintaining the temperature, humidity, and air quality in various areas within the plant. It is a key component in ensuring the stable operation of nuclear power plant equipment, maintaining plant safety, and improving overall operational efficiency.

[0054] In related technologies, the HVAC system of nuclear power plants requires a combination of manual configuration and localized automatic flow adjustment to achieve temperature regulation. After a power outage, operators need to manually configure multiple subsystems within the HVAC system to provide cooling for the plant. The HVAC system internally adjusts airflow based on inlet air temperature and plant capacity to control the ambient temperature of the plant equipment. This method is difficult to adapt to temperature changes in the nuclear power plant environment during operation, easily leading to energy waste.

[0055] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a nuclear power plant HVAC system and a nuclear power plant HVAC regulation method, capable of adapting to temperature changes in the nuclear power plant environment during HVAC operations and reducing energy waste.

[0056] The following explanation is based on the accompanying drawings.

[0057] Referring to Figure 1, a nuclear power plant HVAC system according to a first aspect embodiment of this application is applied to a target nuclear power plant, the target nuclear power plant including multiple buildings, including:

[0058] The plant site temperature measuring module is configured to measure the plant site temperature of the environment where the target nuclear power plant is located. It should be noted that the plant site temperature measuring module is deployed in the environment where the target nuclear power plant is located. In order to make the plant site temperature measurement more accurate and representative, the measurement point of the plant site temperature can be selected at a position that can reflect the temperature condition of the entire nuclear power plant area.

[0059] In some more specific embodiments, the measurement point of the plant site temperature needs to be able to represent the average temperature of the environment where the target nuclear power plant is located, avoiding local temperature anomalies from affecting the overall plant site temperature measurement. The measurement point of the plant site temperature can also be distributed in different areas of the target nuclear power plant to cover the entire plant area and obtain comprehensive temperature data. In the key areas of the nuclear power plant, such as near the reactor building and around the cooling system, temperature monitoring points need to be set to focus on these areas because the temperature of these areas is crucial to the operation of the target nuclear power plant.

[0060] In order to ensure that temperature data can still be obtained in the event of equipment failure, at least two measurement points can be provided in the embodiments of the present application to achieve data redundancy and backup, so that effective plant site temperature can still be measured in the event of failure of a single measurement point.

[0061] The plant room heating and ventilation equipment is provided for each plant room. It should be noted that the plant room heating and ventilation equipment is a device that provides heating, ventilation, and air conditioning functions for the plant room of the target nuclear power plant.

[0062] In some more specific embodiments, the plant room heating and ventilation equipment of the target nuclear power plant in the embodiments of the present application can constitute a plant room non-controlled area ventilation system (DVL). It should be noted that the DVL system is used to maintain the appropriate temperature and ventilation of the plant room non-controlled area room, and to provide suitable environmental conditions for the correct operation of the equipment and the entry of personnel. Specifically, the DVL system mainly provides heating and ventilation functions for nuclear power plant safety class equipment, I&C equipment, cable equipment, and electrical panels, including cooling, fresh air, and other functions. It should be understood that the DVL system is mainly responsible for providing suitable temperature, humidity, and air quality in the non-controlled area of the plant room.

[0063] It should be understood that the DVL system can ensure that the environmental conditions in the non-controlled area meet the requirements of equipment operation and personnel safety. This includes maintaining appropriate temperature and humidity levels, and providing sufficient ventilation to ensure air quality.

[0064] In some more specific embodiments, the DVL system can be composed of several independent subsystems. For example, when the DVL system includes three independent subsystems, these independent subsystems can be referred to as A-string, B-string, and C-string, respectively. The physical separation between the subsystems can improve the safety and reliability of the DVL system. Each string of subsystems can include a 100% capacity operating string and a 100% capacity maintenance string. The operating string is responsible for the ventilation requirements during normal operation, while the maintenance string serves as a backup and can take over the functions of the operating string when it needs maintenance or fails.

[0065] In some more specific embodiments, the DVL system can quickly adjust the operating mode to meet different emergency requirements when an accident or emergency occurs in the nuclear power plant. For example, in the case of loss of external power supply, the DVL can switch to a mode powered by the EDG (emergency diesel generator set) or SBO-DG (station black start diesel generator set) to continue to provide the necessary ventilation and cooling. The DVL system is a critical component of the nuclear power plant, which ensures the safe operation of the nuclear power plant and the safety of personnel by providing suitable environmental conditions and cooling capacity.

[0066] The cold source supply subsystem includes a cold source supply device, a liquid cooling unit, and an air cooling unit. The cold source supply device is used to deliver cold sources to the plant HVAC equipment. The liquid cooling unit is used to provide liquid coolant to the cold source supply device. The air cooling unit is used to provide gaseous coolant to the cold source supply device.

[0067] It should be noted that in the cold source supply subsystem, the liquid cooling unit is used to provide liquid coolant to the cold source supply device, and the air cooling unit is used to provide gaseous coolant to the cold source supply device. Based on this, the cold source supply device forms a cold source by using the cold energy of the liquid coolant or the gaseous coolant and delivers it to the plant HVAC equipment.

[0068] In some more specific embodiments, a safety refrigerant supply system (DEL) can be used as the cold source supply device of the embodiments of the present application. The function of the safety refrigerant supply system (DEL) is to provide cooling water to the key areas and equipment of the nuclear power plant to maintain them within a safe operating temperature range. The DEL system can provide cooling water to multiple key systems and equipment of the nuclear power plant to ensure that they can operate at a safe temperature. The DEL system can be composed of multiple subsystems to supply cooling to the plant HVAC equipment. The cold source supply subsystem includes a liquid cooling unit and an air cooling unit. The liquid cooling unit can be composed of three independent strings A, B, and C, which are redundantly arranged to improve the reliability of the system. The liquid cooling unit in the DEL system can be cooled by the RRI (equipment cooling water system) to supply cooling to different plants. The air cooling unit can serve as a backup for the liquid cooling unit and can provide cooling when the RRI or DEL liquid cooling unit fails.

[0069] In some more specific embodiments, in the event of a loss of power or other emergency, the DEL system can switch to an emergency power source, such as an EDG (emergency diesel generator) or SBO-DG (station black start diesel generator), to ensure a continuous supply of cooling capacity.

[0070] In some more specific embodiments, the DEL system works closely with the DVL system, and when the DVL loses its cooling source, the DVL can operate in fresh air mode alone to maintain the freshness and oxygen level of indoor air, while the DEL system provides additional cooling support if necessary. In the embodiments of the present application, when the plant HVAC equipment constitutes the DVL system, the air-cooled unit can supply gaseous refrigerant to the DVL system to cooperate with the DVL system to supply cooling to the corresponding plant.

[0071] It should be understood that the DEL system is a critical component of a nuclear power plant, which ensures the safe operation of the nuclear power plant and the normal operation of key equipment by providing an effective cooling water source. Through intelligent and automated control, the DEL system can adapt to different operating conditions and environmental changes, improving the operating efficiency and safety of the nuclear power plant.

[0072] It should be emphasized that the plant HVAC equipment and the cooling source supply equipment are two key components of the nuclear power plant HVAC system in the embodiments of the present application, which perform different functions.

[0073] The plant HVAC equipment is mainly responsible for providing suitable temperature and ventilation conditions for some areas of the target nuclear power plant. It ensures that the air quality and environmental conditions of these areas meet the requirements for normal operation of equipment and safe entry of personnel. The target nuclear power plant in the embodiments of the present application can be provided with several rows of plant HVAC equipment, which can be physically isolated between each row to improve the safety and reliability of the system. Each row of plant HVAC equipment also includes an operating row and a maintenance row, the operating row is responsible for ventilation demand during normal operation, and the maintenance row is used for equipment maintenance and troubleshooting. In the event of a loss of cooling source, the plant HVAC equipment can operate in fresh air mode alone to maintain the cooling demand of the plant using external fresh air.

[0074] The cooling source supply equipment is responsible for providing liquid refrigerant and gaseous refrigerant for the target nuclear power plant, where the liquid refrigerant can be used to cool key equipment and systems, such as the plant HVAC equipment mentioned above. The cooling source supply equipment can be divided into two sub-rows: a liquid-cooled unit row and an air-cooled unit row. The liquid-cooled unit row can be cooled by the equipment cooling water system (RRI) and provide liquid refrigerant for different plants; the air-cooled unit row can supply cooling to any row of plant HVAC equipment to ensure that the cooling capacity for the plant is not lost even if part of the plant HVAC equipment fails.

[0075] In addition, the air-cooled unit can also serve as a backup of the liquid-cooled unit, and when the RRI or the liquid-cooled unit fails, the air-cooled unit can provide cooling, reducing the dependence on the RRI cooling water or the cooling source supply device.

[0076] Therefore, the plant HVAC device and the cooling source supply device work together to ensure that the target nuclear power plant can maintain suitable environmental conditions under normal operation and accident conditions, and ensure the normal operation of the equipment and the safety of personnel. In addition, the plant HVAC device and the cooling source supply device can more efficiently respond to different operating conditions and environmental changes, improving the operation reliability and safety of the target nuclear power plant.

[0077] Referring to FIG. 2, the nuclear power plant HVAC regulation method according to the second aspect of the present application applies the nuclear power plant HVAC system of the first aspect of the present application, and can include:

[0078] Step S201, performing refrigeration operation on the multiple plants of the target nuclear power plant by the plant HVAC device to form the refrigeration impact on the plants;

[0079] Step S202, measuring the temperature of the environmental area of the target nuclear power plant by the site temperature measurement module to obtain the site temperature;

[0080] Step S203, controlling the cooling source supply subsystem and the plant HVAC device based on the site temperature to regulate the refrigeration impact on the plants.

[0081] The embodiments of the present application need to perform refrigeration operation on the multiple plants of the target nuclear power plant by the plant HVAC device to form the refrigeration impact on the plants, and measure the temperature of the environmental area of the target nuclear power plant by the site temperature measurement module to obtain the site temperature. Further, the cooling source supply subsystem and the plant HVAC device are controlled based on the site temperature to regulate the refrigeration impact on the plants. It should be noted that the site temperature can be obtained by measuring the temperature of the environmental area of the target nuclear power plant by the site temperature measurement module, and the cooling source supply subsystem and the plant HVAC device are further controlled based on the site temperature to regulate the refrigeration impact on the plants. In this way, the temperature change of the environment in which the nuclear power plant is located during the HVAC operation can be adapted, and energy waste can be reduced.

[0082] Referring to FIG. 3, according to some embodiments of the present application, step S203 of controlling the cooling source supply subsystem and the plant HVAC device based on the site temperature to regulate the refrigeration impact on the plants can include:

[0083] Step S301, in response to the site temperature being lower than a predetermined temperature threshold, controlling the cooling source supply subsystem to perform a cooling source shutdown operation on the plant HVAC device, and controlling the plant HVAC device to perform fresh air refrigeration operation on the plants to regulate the refrigeration impact on the plants.

[0084] In response to the plant site temperature being higher than the predetermined temperature threshold, the cold source supply subsystem is controlled to perform a cold source supply operation on the plant HVAC equipment, and the plant HVAC equipment is controlled to perform a fresh air cooling operation on the plant to adjust the cooling effect on the plant.

[0085] In response to the plant site temperature being lower than the predetermined temperature threshold, the cold source supply subsystem is controlled to perform a cold source shutdown operation on the plant HVAC equipment, and the plant HVAC equipment is controlled to perform a fresh air cooling operation on the plant to adjust the cooling effect on the plant. It should be noted that if the plant site temperature is lower than the temperature threshold, the low temperature outside has already provided sufficient cooling capacity for the plant, so there is no need for additional mechanical cooling. By introducing fresh cold air from the outside, the plant HVAC equipment not only effectively reduces the internal temperature, but also ensures air quality and meets the ventilation demand, which is the fresh air cooling operation, i.e. fresh air mode. It should be understood that the fresh air mode reduces the dependence on the cold source supply subsystem, thereby reducing energy consumption and operating costs. In the fresh air mode, the plant HVAC equipment can operate independently of the cooling equipment of the cold source supply subsystem, so that the plant HVAC equipment can maintain the stability of the internal environment of the plant even if part of the cold source supply subsystem is damaged or under maintenance. This design increases the redundancy and reliability of the entire HVAC system, ensuring the safe operation of the nuclear power plant under various environmental conditions.

[0086] In addition, the plant site temperature is monitored in real time by the plant site temperature measurement module and compared with the preset threshold. Once the temperature data indicates that the outside air is sufficient to provide the required cooling effect, the plant HVAC equipment can be adjusted to switch to the fresh air mode. This automated switching reduces the need for human operation and improves the response speed and operating efficiency of the system.

[0087] In the case where the off-site power supply detection module detects an abnormal off-site power supply, if the plant site temperature is higher than the temperature threshold, it means that the fresh air mode of the plant HVAC equipment is not sufficient to achieve the required cooling effect, at which point the emergency power generation module needs to be started to provide backup power for the liquid cooling unit to prevent the failure of off-site power supply from causing damage to the target nuclear power plant.

[0088] In step S302 of some embodiments, in response to the plant site temperature being higher than the predetermined temperature threshold, the cold source supply subsystem is controlled to perform a cold source supply operation on the plant HVAC, and the plant HVAC is controlled to perform a fresh air cooling operation on the plant to adjust the cooling effect on the plant. It should be noted that when the plant site temperature is higher than the temperature threshold, it means that the fresh air mode of the plant HVAC is not sufficient to achieve the required cooling effect, and therefore the cold source supply subsystem is controlled to perform a cold source supply operation on the plant HVAC in addition to the fresh air cooling operation of the plant HVAC on the plant, so as to create a better cooling effect on the plant.

[0089] According to some embodiments of the present application, the nuclear power plant HVAC system can further include:

[0090] An off-site power supply detection module is configured to detect the off-site power supply of the target nuclear power plant.

[0091] It should be noted that the off-site power supply refers to the power supply that the target nuclear power plant accesses from the external power grid or external power supply point. Such power supply provides the necessary power for the plant or facility to support its normal operation, including production, lighting, equipment operation, safety systems, etc. In addition to relying on its own power generation capacity (such as the power generated by the nuclear power plant's turbine generator set), the nuclear power plant may also need to obtain power from the external power grid, so the off-site power supply is particularly important for the target nuclear power plant.

[0092] In some embodiments, the reliability and safety of the off-site power supply are usually considered in the design and operation of the target nuclear power plant, including emergency response measures when the off-site power supply fails. For example, if the off-site power supply fails, the target nuclear power plant needs to rely on its own emergency diesel generator set or other emergency power generation modules to maintain critical operations and safety functions.

[0093] Based on this, each liquid cooling unit is configured with a corresponding emergency power generation module; wherein the emergency power generation module is configured to, in the case that the off-site power supply detection module detects that the off-site power supply is abnormal, if the plant site temperature is higher than the temperature threshold, start the emergency power generation module to provide backup power for the liquid cooling unit.

[0094] Referring to FIG. 4, according to some embodiments of the present application, the nuclear power plant HVAC system can further include an off-site power supply detection module configured to detect the off-site power supply of the target nuclear power plant, and each liquid cooling unit is configured with a corresponding emergency power generation module.

[0095] Before step S302 of controlling the cold source supply subsystem to perform a cold source supply operation on the plant HVAC, and controlling the plant HVAC to perform a fresh air cooling operation on the plant to adjust the cooling effect on the plant, it can further include:

[0096] Step S401, if the off-site power supply detection module detects an abnormality in the off-site power supply, and if the plant site temperature is higher than the temperature threshold, start the emergency power generation module to provide backup power for the liquid cooling unit.

[0097] It should be noted that, in the case where the off-site power supply detection module detects an abnormality in the off-site power supply, it means that the off-site power supply of the target nuclear power plant has an abnormality, and at this time emergency response measures need to be taken to deal with the abnormality of the off-site power supply. If the plant site temperature is higher than the temperature threshold, it means that the plant HVAC equipment through the fresh air mode is sufficient to cool.

[0098] It should be emphasized that if the plant site temperature is lower than the temperature threshold, the low temperature of the outside world has already provided sufficient cooling capacity for the plant building, so additional mechanical cooling is not needed. The plant HVAC equipment through the introduction of fresh cold air from the outside not only can effectively reduce the internal temperature, but also can ensure the air quality and meet the ventilation demand, which is the fresh air cooling operation. It should be understood that the fresh air mode reduces the dependence on the cold source supply subsystem, thereby reducing energy consumption and operating costs. In the fresh air mode, the plant HVAC equipment can be independent of the cooling equipment of the cold source supply subsystem, so that even in the case of partial function damage or maintenance of the cold source supply subsystem, the plant HVAC equipment can still maintain the stability of the internal environment of the plant building. This design increases the redundancy and reliability of the entire HVAC system, ensuring the safe operation of the nuclear power plant under various environmental conditions.

[0099] In addition, the plant site temperature is monitored in real time by the plant site temperature measurement module and compared with the preset threshold. Once the temperature data indicates that the outside air is sufficient to provide the required cooling effect, the plant HVAC equipment can be adjusted to switch to the fresh air mode. This automated switching reduces the need for human operation and improves the response speed and operating efficiency of the system.

[0100] In the case where the off-site power supply detection module detects an abnormality in the off-site power supply, if the plant site temperature is higher than the temperature threshold, it means that the fresh air mode of the plant HVAC equipment is not sufficient to achieve the required cooling effect, at this time the emergency power generation module needs to be started to provide backup power for the liquid cooling unit to prevent the off-site power supply failure from causing losses to the target nuclear power plant.

[0101] According to some embodiments of the present application, the nuclear power plant HVAC system can further comprise:

[0102] Each liquid cooling unit is further configured with a corresponding station black start power generation module, and the station black start power generation module is coupled to the air cooling unit. It should be noted that the station black start power generation module is an emergency power source used by the target nuclear power plant in more extreme cases, for example, in the case that the off-site power supply detection module detects that the off-site power supply is abnormal, all emergency power generation modules are disabled, and the target nuclear power plant enters a station black start (SBO) disclosure. On this basis, the station black start power generation module can be started to provide backup power supply for the air cooling unit.

[0103] Based on this, the station black start power generation module is configured to: in the case that the off-site power supply detection module detects that the off-site power supply is abnormal and the emergency power generation module is abnormal, if the site temperature is higher than the temperature threshold, start the station black start power generation module to provide backup power supply for the air cooling unit.

[0104] The main role of the station black start power generation module is to provide necessary power for the air cooling unit when all other power sources fail, to support safety systems and critical operations until partial or full power supply can be restored.

[0105] Referring to FIG. 5, according to some embodiments of the present application, the nuclear power plant heating and ventilation system can further include: each liquid cooling unit is further configured with a corresponding station black start power generation module, and the station black start power generation module is coupled to the air cooling unit.

[0106] Before step S302 of controlling the cold source supply subsystem to perform a cold source supply operation on the plant heating and ventilation equipment and controlling the plant heating and ventilation equipment to perform a fresh air refrigeration operation on the plant to adjust the refrigeration effect on the plant, it can further include:

[0107] Step S501, in the case that the off-site power supply detection module detects that the off-site power supply is abnormal and the emergency power generation module is abnormal, if the site temperature is higher than the temperature threshold, start the station black start power generation module to provide backup power supply for the air cooling unit.

[0108] In the target nuclear power plant, the station black start power generation module is arranged to supply power to the air-cooled unit instead of the liquid-cooled unit. The reason is that: as a backup of the liquid cooling system, the air cooling system is simpler in design, faster in starting and responding, which is very critical in emergency. The air cooling system directly uses outdoor air for cooling, reducing the dependence on the water circulation system. In the case that the off-site power supply detection module detects that the off-site power supply is abnormal, the air cooling system can quickly take over the cooling task to ensure that the cooling demand of the key area is met. In addition, the station black start power generation module can serve as the highest level backup power supply in the target nuclear power plant. The design purpose is to ensure that the key safety systems of the target nuclear power plant can at least obtain the minimum power supply in extreme cases. Therefore, the station black start power generation module supplies power to the air-cooled unit, which can provide an additional safety protection level to ensure that the air cooling system can continue to operate even in the case that the off-site power supply is abnormal and the emergency power supply module is abnormal. In summary, arranging the station black start power generation module to supply power to the air-cooled unit instead of the liquid-cooled unit can improve the response capability, reliability and safety of the nuclear power plant in emergency.

[0109] It needs to be emphasized that if the site temperature is lower than the temperature threshold, the low temperature of the outside world has already provided sufficient cooling capacity for the plant, so additional mechanical refrigeration is not needed. The plant HVAC equipment introduces fresh cold air from the outside world through the fresh air mode, which not only effectively reduces the internal temperature, but also ensures the air quality and meets the ventilation demand.

[0110] In the case that the off-site power supply detection module detects that the off-site power supply is abnormal and the emergency power supply module is abnormal, if the site temperature is higher than the temperature threshold, it means that the fresh air mode of the plant HVAC equipment is not enough to achieve the required cooling effect, at this time the station black start power generation module needs to be started to provide backup power supply to the air-cooled unit to prevent the case that the off-site power supply fails and the emergency power supply module is abnormal from causing losses to the target nuclear power plant.

[0111] In some more specific embodiments, the power supply situation of the nuclear power plant HVAC system is as follows:

[0112] Liquid-cooled unit: emergency power supply module power supply, in the case that the off-site power supply detection module detects that the off-site power supply is abnormal, the cold source supply subsystem liquid cooling column loses;

[0113] Air-cooled unit: station black start power generation module power supply, in the case that the off-site power supply detection module detects that the off-site power supply is abnormal, the cold source supply subsystem air-cooled column is still available;

[0114] Maintenance column of plant HVAC equipment: plant power (main and auxiliary off-site power) power supply, in the case that the off-site power supply detection module detects that the off-site power supply is abnormal, the plant non-control area ventilation system (DVL) maintenance column loses;

[0115] The operation column of the plant HVAC equipment: the emergency power module or the black start power module of the station supplies power;

[0116] The fresh air part of the plant HVAC equipment: the emergency power module or the black start power module of the station supplies power.

[0117] According to some embodiments of the present application, the cold source supply subsystem can include at least two columns of liquid cooling units;

[0118] The air cooling unit is configured to: if the off-site power supply detection module detects abnormal power supply of off-site power supply, and at least two columns of liquid cooling units have abnormal power supply of emergency power modules, and if the site temperature is higher than the temperature threshold, start the air cooling unit to supply cooling to the plant.

[0119] Referring to FIG. 6, according to some embodiments of the present application, the cold source supply subsystem can include at least two columns of liquid cooling units.

[0120] Before step S302 of controlling the cold source supply subsystem to perform the cold source supply operation on the plant HVAC equipment and controlling the plant HVAC equipment to perform the fresh air cooling operation on the plant to adjust the cooling effect on the plant, it can further include:

[0121] Step S601, if the off-site power supply detection module detects abnormal power supply of off-site power supply, and at least two columns of liquid cooling units have abnormal power supply of emergency power modules, and if the site temperature is higher than the temperature threshold, start the air cooling unit to supply cooling to the plant.

[0122] It should be noted that the cold source supply subsystem can include at least two columns of liquid cooling units, wherein each column of liquid cooling units can provide liquid coolant for the plant HVAC equipment installed in each plant. It should be pointed out that the at least two columns of liquid cooling units can provide liquid coolant for each plant HVAC equipment through the transmission pipeline of the liquid coolant. If some columns of liquid cooling units fail, each plant HVAC equipment can still normally obtain liquid coolant under this setting.

[0123] It should be emphasized that each liquid cooling unit is configured with a corresponding emergency power module, and the air cooling unit is used to cooperate with the plant HVAC equipment to supply cooling to the corresponding plant. If the off-site power supply detection module detects abnormal power supply of off-site power supply, and at least two columns of liquid cooling units have abnormal power supply of emergency power modules, and if the site temperature is higher than the temperature threshold, it may mean that the liquid coolant supply of the plant HVAC equipment is insufficient, at which time the air cooling unit needs to be started to supply cooling to the corresponding plant, in order to prevent the situation of off-site power failure and abnormal power supply of emergency power modules from causing damage to the target nuclear power plant.

[0124] Referring to FIG. 7, according to some specific embodiments provided by the present application, the plant HVAC equipment of the target nuclear power plant in the embodiments of the present application can constitute a plant non-control area ventilation system (DVL), and a safety refrigerant supply system (DEL) is used as a cold source supply device of the embodiments of the present application.

[0125] During normal operation and accident conditions of the target nuclear power plant, the non-control area ventilation system (DVL) of each plant maintains a suitable temperature and ventilation of the safety plant non-control area room, and provides suitable environmental conditions for the correct operation of the equipment and the entry of personnel.

[0126] The safety refrigerant supply system (DEL) is divided into two sub-columns: a liquid cooling unit column and an air cooling unit column. The liquid cooling unit column is a column of liquid cooling units, and the air cooling unit column is a column of air cooling units.

[0127] The liquid cooling unit column is used to provide liquid coolant for the plant non-control area ventilation system (DVL), and there are three independent columns A, B, and C. The A column, the B column, and the C column are redundantly arranged, and the liquid cooling units can be cooled by the cooling liquid of the equipment cooling liquid system (RRI), and the BSA, BSB, and BSC plants are cooled.

[0128] The air cooling unit column serves as a backup for the liquid cooling unit, and the air cooling unit is cooled by outdoor air to reduce the impact when the RRI cooling liquid or the safety refrigerant supply system (DEL) is unavailable. When the liquid cooling unit of the RRI or the safety refrigerant supply system (DEL) fails, the air cooling unit can provide cooling for the safety refrigerant supply system (DEL). The liquid cooling unit failure can include loss of ultimate heat sink (LUHS) and station black start (SBO) conditions. In addition, the air cooling unit column can also directly cool the A column, the B column, or the C column of the plant. Generally, due to capacity limitations, it cannot cool three columns at the same time, but it can cool two columns at the same time. For accident handling, two columns are sufficient.

[0129] The plant non-control area ventilation system (DVL) is composed of three columns, which are physically isolated in the corresponding safety plant, and each column is composed of 1x100% operating column and 1x100% maintenance column.

[0130] The A / B / C columns of the safety refrigerant supply system (DEL) are respectively provided with one liquid cooling unit to cool the A / B / C of the plant non-control area ventilation system (DVL); in addition, the safety refrigerant supply system (DEL) is also provided with one air cooling unit, which can cool any column of the plant non-control area ventilation system (DVL) A / B / C, which ensures that the loss of one cooling chain will not result in the loss of the cooling capacity of the entire system.

[0131] Fresh air operation mode of the plant non-control area ventilation system (DVL):

[0132] During normal operation, the non-control area ventilation system (DVL) of the plant continuously runs in the fresh air mode, cooperating with the cold source of the safety refrigerant supply system (DEL) to ensure ventilation and air exchange and plant cooling. When the cold source of the non-control area ventilation system (DVL) of the plant is lost, the non-control area ventilation system (DVL) of the plant runs in the fresh air mode alone. When the temperature at the site of the nuclear power plant is low, the non-control area ventilation system (DVL) of the plant runs in the fresh air mode, which can ensure plant cooling.

[0133] Referring to FIG. 8, FIG. 8 illustrates a hardware structure of an electronic device according to another embodiment, which can include:

[0134] The processor 801 can be implemented in a manner of a general-purpose CPU (Central Processing Unit), a microprocessor, an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits, and is configured to execute a related program to implement the technical solutions provided by the embodiments of the present application.

[0135] The memory 802 can be implemented in a form of a ROM (Read Only Memory), a static storage device, a dynamic storage device, or a RAM (Random Access Memory), and the like. The memory 802 can store an operating system and other application programs, and when the technical solutions provided by the embodiments of the present application are implemented by software or firmware, the related program codes are stored in the memory 802 and are called and executed by the processor 801 to implement the nuclear power plant heating regulation method according to the embodiments of the present application.

[0136] The input / output interface 803 is configured to implement information input and output.

[0137] The communication interface 804 is configured to implement communication interaction between the device and other devices, and can implement communication in a wired manner (for example, USB, network cable, and the like) or in a wireless manner (for example, mobile network, WIFI, Bluetooth, and the like).

[0138] The bus 805 is configured to transmit information between various components (for example, the processor 801, the memory 802, the input / output interface 803, and the communication interface 804) of the device.

[0139] The processor 801, the memory 802, the input / output interface 803, and the communication interface 804 are connected to each other in the device through the bus 805.

[0140] The embodiment of the present application further provides a computer program product, which can include a computer program. A processor of a computer device reads the computer program and executes, so that the computer device executes the nuclear power plant warm air conditioning adjustment method.

[0141] The terms "first", "second", "third", "fourth" and the like in the description of the present application and in the claims of the foregoing drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the use of the terms so construed can be interchanged, such that, for example, embodiments of the present application described herein could operate in other sequences than those described or illustrated herein. Further, the terms "comprise", "comprising", "include", "including", and the like, are meant to encompass non-exclusive inclusions, such that processes, methods, articles, or apparatuses that comprise, include, or the like, a list of steps or elements, can include other steps or elements not expressly listed or inherent to such processes, methods, articles, or apparatuses.

[0142] It should be understood that, in the present application, "at least one" means one or more, and "multiple" means two or more. "And / or" is used to describe the association relationship of the associated objects, which means that there can be three relationships, for example, "A and / or B" can represent three cases of only A, only B, and A and B existing at the same time, where A and B can be singular or plural. The character " / " generally represents that the associated objects before and after are in an "or" relationship. "At least one of the following" or the like means any combination of these items, which can include any combination of single item or multiple items. For example, at least one of a, b or c can represent a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0143] It should be understood that in the description of the embodiments of the present application, the meaning of multiple (or multiple items) is two or more, greater than, less than, more than, etc. are not included in the number, above, below, within, etc. are understood to include the number.

[0144] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other manners. For example, the described device embodiments are merely schematic. For example, the division of the units is only a logical function division. There can be another division manner for the actual implementation, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections between different units, can be indirect couplings or communication connections through some interfaces, devices or units, and can be electrical, mechanical or in other forms.

[0145] The units described as separated components can or can not be physically separated, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purposes of the embodiments of the present application.

[0146] In addition, each functional unit in the embodiments of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be implemented in the form of hardware, or in the form of software functional units.

[0147] When the integrated unit is implemented in the form of software functional units and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on such an understanding, the technical solutions of the present application essentially or the part that makes a contribution to the prior art, or all or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, and can include several instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods in the embodiments of the present application. The foregoing storage medium can include various media that can store program codes, such as a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0148] It should also be understood that the various embodiments provided by the embodiments of the present application can be combined in any manner to achieve different technical effects.

[0149] The above is a specific description of the embodiments of the present application, but the present application is not limited to the above-described embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements can be included in the scope defined by the claims of the present application.

Claims

1. A heating, ventilation, and air conditioning system for a nuclear power plant, characterized in that, Applied to a target nuclear power plant, the target nuclear power plant comprising multiple buildings, including: The site temperature measurement module is used to measure the site temperature of the environmental area where the target nuclear power plant is located; Factory heating and ventilation equipment, each of the aforementioned factory buildings is equipped with corresponding factory heating and ventilation equipment; The cold source supply subsystem includes a cold source supply device, a liquid chiller unit, and an air-cooled unit. The cold source supply device is used to supply cold source to the HVAC equipment of the plant. The liquid chiller unit is used to provide liquid refrigerant to the cold source supply device. The air-cooled unit is used to provide gaseous refrigerant to the cold source supply device.

2. The nuclear power plant HVAC system according to claim 1, characterized in that, The nuclear power plant's HVAC system also includes: An external power supply detection module is used to detect the external power supply of the target nuclear power plant. Each of the liquid-cooled units is equipped with a corresponding emergency power generation module; The emergency power generation module is configured to: if the external power supply detection module detects an abnormality in the external power supply and the temperature at the plant site is higher than a predetermined temperature threshold, activate the emergency power generation module to provide backup power to the liquid-cooled unit.

3. The nuclear power plant HVAC system according to claim 2, characterized in that, The nuclear power plant's HVAC system also includes: Each of the liquid-cooled units is also equipped with a corresponding black-start power generation module, which is coupled to the air-cooled unit; The blackout start-up power generation module is configured to: if the external power supply detection module detects an abnormality in the external power supply and the emergency power generation module also has an abnormality in power supply, and if the site temperature is higher than the temperature threshold, activate the blackout start-up power generation module to provide backup power for the air-cooled unit.

4. The nuclear power plant HVAC system according to claim 2, characterized in that, The cold source supply subsystem includes at least two rows of the liquid chiller units; The air-cooled unit is configured to: if the external power supply detection module detects an abnormality in the external power supply, and at least two of the liquid-cooled units have an abnormality in the emergency power generation module, and if the site temperature is higher than the temperature threshold, start the air-cooled unit to provide cooling for the plant.

5. A method for HVAC regulation in a nuclear power plant, characterized in that, The method, applied to the nuclear power plant HVAC system of claim 1, comprises: Cooling operations are performed on multiple buildings of the target nuclear power plant using the plant's heating, ventilation, and air conditioning (HVAC) equipment to create a cooling effect on the buildings. The site temperature is obtained by measuring the temperature of the environmental area of ​​the target nuclear power plant using the site temperature measurement module. Based on the site temperature, the cold source supply subsystem and the plant's HVAC equipment are controlled to adjust the cooling effect on the plant.

6. The method according to claim 5, characterized in that, The control of the cold source supply subsystem and the plant's HVAC equipment based on the plant site temperature to adjust the impact of fresh air cooling on the plant includes: In response to the site temperature being higher than a predetermined temperature threshold, the cold source supply subsystem is controlled to perform a cold source supply operation on the plant's HVAC equipment, and the plant's HVAC equipment is controlled to perform a fresh air cooling operation on the plant, so as to adjust the impact of fresh air cooling on the plant.

7. The method according to claim 6, characterized in that, The nuclear power plant HVAC system also includes: an external power supply detection module for detecting the external power supply of the target nuclear power plant, and each liquid-cooled unit is equipped with a corresponding emergency power generation module; Before the control system for supplying cold source to the plant's HVAC equipment and the control system for the plant's HVAC equipment to perform fresh air cooling operation to adjust the impact of fresh air cooling on the plant, the method further includes: If the external power supply detection module detects an abnormality in the external power supply, and the temperature at the plant site is higher than the temperature threshold, the emergency power generation module will be activated to provide backup power to the liquid-cooled unit.

8. The method according to claim 7, characterized in that, The nuclear power plant HVAC system also includes: each of the liquid-cooled units is also equipped with a corresponding black-start power generation module, the black-start power generation module being coupled to the air-cooled unit; Before the control system for supplying cold source to the plant's HVAC equipment and the control system for the plant's HVAC equipment to perform fresh air cooling operation to adjust the impact of fresh air cooling on the plant, the method further includes: If the external power supply detection module detects an abnormality in the external power supply, and the emergency power generation module also experiences an abnormality in power supply, and if the site temperature is higher than the temperature threshold, the black-start power generation module will be activated to provide backup power to the air-cooled unit.

9. The method according to claim 7, characterized in that, The cold source supply subsystem includes at least two rows of the liquid chiller units; Before the control system for supplying cold source to the plant's HVAC equipment and the control system for the plant's HVAC equipment to perform fresh air cooling operation to adjust the impact of fresh air cooling on the plant, the method further includes: If the external power supply detection module detects an abnormality in the external power supply, and at least two of the liquid-cooled units have an abnormality in the emergency power generation module, and if the site temperature is higher than the temperature threshold, the air-cooled units will be started to provide cooling for the plant.

10. The method according to claim 5, characterized in that, The control of the cold source supply subsystem and the plant's HVAC equipment based on the plant site temperature to adjust the impact of fresh air cooling on the plant includes: In response to the site temperature being lower than a predetermined temperature threshold, the cold source supply subsystem is controlled to shut down the cold source for the plant's HVAC equipment, and the plant's HVAC equipment is controlled to perform fresh air cooling for the plant, so as to adjust the impact of fresh air cooling on the plant.

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