Fresh air handling unit control method, system and device, fresh air handling unit and storage medium

Abstract

Embodiments of the present application relate to a fresh air handling unit control method, system, device, fresh air handling unit and storage medium, obtaining fresh air temperature, deep water temperature delivered by deep water source to a first heat exchange assembly, and target supply air temperature corresponding to a supply air outlet of the fresh air handling unit; determining a target heat exchange direction according to the fresh air temperature and the target supply air temperature, and when a first temperature difference between the fresh air temperature and the deep water temperature reaches a preset temperature difference, and an actual heat exchange direction between the deep water and the fresh air is consistent with the target heat exchange direction, controlling the first heat exchange assembly to perform first heat exchange treatment on the fresh air using the deep water; obtaining an outlet air temperature after the first heat exchange treatment, and controlling a second heat exchange assembly to perform second heat exchange treatment on the fresh air according to a second temperature difference between the outlet air temperature and the target supply air temperature. Thus, invalid or reverse heat exchange of the fresh air handling unit of the energy-saving air conditioning equipment can be avoided, the load and operating energy consumption of the second heat exchange assembly are reduced, and the adjustment accuracy and stability of the supply air temperature are improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of air conditioning control technology, and in particular to a fresh air handling unit control method, system, device, fresh air handling unit and storage medium. Background Technology

[0002] Fresh air handling units typically use heat exchange components to cool, dehumidify, or heat outdoor fresh air to ensure that the air supplied to the room meets preset temperature requirements. In hot and humid summer environments or cold winter environments, fresh air handling units often need to continuously consume cooling or heating capacity, resulting in high system energy consumption.

[0003] Most existing fresh air handling units use a single heat exchange method, typically starting the cooling or heating equipment directly based on the fresh air temperature. This fails to consider the temperature conditions of available natural cold or heat sources and to perform staged heat exchange treatment on the fresh air. When the primary heat exchange capacity is insufficient, there is also a lack of a control mechanism to continue compensating for heat exchange based on the outlet air temperature after heat exchange, making it difficult to balance energy saving and supply air temperature regulation.

[0004] Therefore, the technical problem that the existing technology urgently needs to solve is: how to reduce the operating energy consumption of fresh air handling units when adjusting the supply air temperature. Summary of the Invention

[0005] In view of this, in order to solve the above-mentioned technical problems or some of the technical problems, the present invention provides a fresh air handling unit control method, system, device, fresh air handling unit and storage medium.

[0006] In a first aspect, embodiments of the present invention provide a fresh air handling unit control method, applied to a fresh air handling unit including a first heat exchange component and a second heat exchange component, the method comprising: The temperature of the fresh air before it enters the first heat exchange component is obtained, as is the temperature of the deep water supplied from the deep water source to the first heat exchange component, and the target supply air temperature corresponding to the air outlet of the fresh air unit is obtained. The target heat exchange direction is determined based on the fresh air temperature and the target supply air temperature. When the first temperature difference between the fresh air temperature and the deep water temperature reaches the preset temperature difference, and the actual heat exchange direction between the deep water and the fresh air is consistent with the target heat exchange direction, the first heat exchange component is controlled to use the deep water to perform the first heat exchange treatment on the fresh air. The outlet air temperature after the first heat exchange treatment is obtained, and the second heat exchange component is controlled to perform a second heat exchange treatment on the fresh air based on the second temperature difference between the outlet air temperature and the target supply air temperature.

[0007] In one possible implementation, determining the target heat exchange direction based on the fresh air temperature and the target supply air temperature includes: When the fresh air temperature is higher than the sum of the target supply air temperature and the preset temperature deviation, the fresh air unit is determined to be in summer operation mode, and the direction of reducing the fresh air temperature is determined as the target heat exchange direction; When the fresh air temperature is lower than the difference between the target supply air temperature and the preset temperature deviation, the fresh air unit is determined to be in winter operation mode, and the direction of increasing the fresh air temperature is determined as the target heat exchange direction; When the fresh air temperature is within the temperature range determined by the target supply air temperature and the preset temperature deviation, the first heat exchange component and the second heat exchange component are controlled to maintain the current operating state or stop heat exchange.

[0008] In one possible implementation, when the first temperature difference between the fresh air temperature and the deep water temperature reaches a preset temperature difference, and the actual heat exchange direction between the deep water and the fresh air is consistent with the target heat exchange direction, controlling the first heat exchange component to perform a first heat exchange treatment on the fresh air using the deep water includes: Calculate the absolute value of the difference between the fresh air temperature and the deep water temperature to obtain the first temperature difference, and compare the first temperature difference with the preset temperature difference; When the fresh air temperature is higher than the deep water temperature, the direction in which heat is transferred from the fresh air to the deep water is determined as the actual heat exchange direction; when the deep water temperature is higher than the fresh air temperature, the direction in which heat is transferred from the deep water to the fresh air is determined as the actual heat exchange direction. When the target heat exchange direction is the direction of reducing the temperature of the fresh air and the actual heat exchange direction is the direction of transferring heat from the fresh air to the deep water, or when the target heat exchange direction is the direction of increasing the temperature of the fresh air and the actual heat exchange direction is the direction of transferring heat from the deep water to the fresh air, the actual heat exchange direction is determined to be consistent with the target heat exchange direction. When the first temperature difference reaches the preset temperature difference and the actual heat exchange direction is consistent with the target heat exchange direction, the deep water is controlled to flow through the first heat exchange component so that the first heat exchange component uses the deep water to perform the first heat exchange treatment on the fresh air.

[0009] In one possible implementation, obtaining the outlet air temperature after the first heat exchange treatment and controlling the second heat exchange component to perform a second heat exchange treatment on the fresh air based on a second temperature difference between the outlet air temperature and the target supply air temperature includes: The temperature of the fresh air output from the first heat exchange component and before entering the second heat exchange component is obtained as the outlet air temperature; Calculate the absolute value of the difference between the outlet air temperature and the target supply air temperature to obtain the second temperature difference, and compare the second temperature difference with the preset temperature deviation; When the outlet air temperature is higher than the target supply air temperature and the second temperature difference reaches the preset temperature deviation, the chilled water is controlled to flow through the second heat exchange component so that the second heat exchange component performs a second heat exchange treatment to reduce the temperature of the fresh air after the first heat exchange treatment. When the outlet air temperature is lower than the target supply air temperature and the second temperature difference reaches the preset temperature deviation, hot water is controlled to flow through the second heat exchange component so that the second heat exchange component performs a second heat exchange treatment to increase the temperature of the fresh air after the first heat exchange treatment; when the second temperature difference does not reach the preset temperature deviation, the second heat exchange component is controlled not to perform the second heat exchange treatment.

[0010] In one possible implementation, the fresh air handling unit further includes a conventional air duct, an emergency air duct, a supply fan disposed in the conventional air duct, and a hydraulically driven fan disposed in the emergency air duct. The first heat exchange component and the second heat exchange component are disposed in the conventional air duct along the fresh air flow direction. The method further includes: When the power supply status of the fresh air unit is normal, the blower is controlled to drive the fresh air to flow through the first heat exchange component and the second heat exchange component in sequence, so as to perform the first heat exchange treatment and the second heat exchange treatment on the fresh air. When the power supply status of the fresh air unit is switched from the normal power supply status to the power failure status, the blower is controlled to stop running, the conventional air duct is closed and the emergency air duct is opened, so that the fresh air bypasses the first heat exchange component and the second heat exchange component and enters the emergency air duct. The deep water supply line connected to the first heat exchange component is switched to the hydraulic drive branch line connected to the hydraulic drive fan, and the head pressure formed by the deep water is used to drive the hydraulic drive fan to deliver fresh air flowing through the emergency air duct into the room.

[0011] In one possible implementation, the fresh air handling unit further includes a split heat pipe disposed in the emergency air duct, the split heat pipe including an evaporator end located in the emergency air duct and a condenser end connected to an emergency heat exchange branch for heat exchange, and the method further includes: When the power supply state switches from the normal power supply state to the power outage state, the emergency heat exchange branch is connected to the deep water source so as to introduce a portion of the deep water into the emergency heat exchange branch. The deep water flowing through the emergency heat exchange branch exchanges heat with the condenser end, so that the heat exchange medium in the split heat pipe absorbs the heat of the fresh air flowing through the emergency air duct at the evaporation end and transfers the heat to the condenser end. The water-driven fan is used to deliver fresh air, which has undergone heat exchange at the evaporator end, into the room.

[0012] Secondly, embodiments of the present invention provide a fresh air handling unit control system, including a fresh air handling unit, a deep water source, and a controller; The fresh air handling unit includes a conventional air duct, an emergency air duct, a first heat exchange component, a second heat exchange component, a blower, a separate heat pipe, and a hydraulically driven fan. The first heat exchange component, the second heat exchange component, and the blower are arranged sequentially in the conventional air duct along the fresh air flow direction, while the separate heat pipe and the hydraulically driven fan are arranged in the emergency air duct. The water side of the first heat exchange component is connected to the deep water source through a deep water supply pipeline, and is used to perform a first heat exchange treatment on the fresh air using deep water. The medium side of the second heat exchange component is connected to a cold water source or a hot water source, and is used to perform a second heat exchange treatment on the fresh air after the first heat exchange treatment. The condenser end of the split heat pipe is connected to the deep water source for heat exchange via an emergency heat exchange branch, and the hydraulically driven fan is connected to the deep water source via a hydraulically driven branch, for use in emergency heat exchange and hydraulically driven air supply using the deep water in the event of a power outage. The conventional air duct and the emergency air duct are respectively equipped with a first air valve and a second air valve for switching the fresh air flow path, and the deep water supply pipeline, the emergency heat exchange branch and the hydraulic drive branch are respectively equipped with water circuit control valves. The controller is connected to the first heat exchange component, the second heat exchange component, the blower, the first air valve, the second air valve, and the water control valve respectively, and is used to execute the fresh air unit control method described in any one of the first aspects above.

[0013] Thirdly, embodiments of the present invention provide a fresh air handling unit control device, comprising: The acquisition module is used to acquire the fresh air temperature before entering the first heat exchange component of the fresh air unit, the deep water temperature delivered from the deep water source to the first heat exchange component, and the target air supply temperature corresponding to the air outlet of the fresh air unit. The first control module is used to determine the target heat exchange direction based on the fresh air temperature and the target supply air temperature, and when the first temperature difference between the fresh air temperature and the deep water temperature reaches a preset temperature difference, and the actual heat exchange direction between the deep water and the fresh air is consistent with the target heat exchange direction, control the first heat exchange component to perform a first heat exchange treatment on the fresh air using the deep water. The second control module is used to obtain the outlet air temperature after the first heat exchange treatment, and control the second heat exchange component of the fresh air unit to perform a second heat exchange treatment on the fresh air according to the second temperature difference between the outlet air temperature and the target supply air temperature.

[0014] Fourthly, embodiments of the present invention provide a computer device, including: a processor and a memory, wherein the processor is configured to execute a fresh air handling unit control program stored in the memory to implement the fresh air handling unit control method described in any one of the first aspects above.

[0015] Fifthly, embodiments of the present invention provide a storage medium storing one or more programs, which can be executed by one or more processors to implement the fresh air unit control method described in any one of the first aspects.

[0016] The fresh air handling unit control method provided in this embodiment of the invention obtains the fresh air temperature before entering the first heat exchange component, the deep water temperature delivered from the deep water source to the first heat exchange component, and the target supply air temperature corresponding to the air outlet of the fresh air handling unit; determines the target heat exchange direction based on the fresh air temperature and the target supply air temperature; and controls the first heat exchange component to perform a first heat exchange treatment on the fresh air using deep water when the first temperature difference between the fresh air temperature and the deep water temperature reaches a preset temperature difference and the actual heat exchange direction between the deep water and the fresh air is consistent with the target heat exchange direction; obtains the outlet air temperature after the first heat exchange treatment, and controls the second heat exchange component to perform a second heat exchange treatment on the fresh air based on the second temperature difference between the outlet air temperature and the target supply air temperature. Therefore, by determining whether deep water is suitable for heat exchange based on the fresh air temperature, deep water temperature, and target supply air temperature, and prioritizing the use of deep water for the first heat exchange treatment when the actual heat exchange direction is consistent with the target heat exchange direction, and then controlling the second heat exchange component for supplementary heat exchange based on the outlet air temperature after the first heat exchange treatment, ineffective or reverse heat exchange can be avoided, reducing the load and operating energy consumption of the second heat exchange component, while improving the adjustment accuracy and stability of the supply air temperature. Attached Figure Description

[0017] Figure 1 A flowchart illustrating a fresh air handling unit control method provided in an embodiment of this application; Figure 2 A schematic diagram of a fresh air handling unit control system provided in an embodiment of this application; Figure 3 A schematic diagram of another fresh air unit control system provided in this application embodiment; Figure 4 A flowchart illustrating another fresh air handling unit control method provided in an embodiment of this application; Figure 5This is a schematic diagram of the structure of a fresh air handling unit control device provided in an embodiment of this application; Figure 6 This is a schematic diagram of a fresh air handling unit provided in an embodiment of this application. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of 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.

[0019] To facilitate understanding of the embodiments of the present invention, further explanations and descriptions will be provided below with reference to the accompanying drawings and specific embodiments. These embodiments do not constitute a limitation on the embodiments of the present invention.

[0020] Figure 1 This is a flowchart illustrating a fresh air handling unit control method provided in an embodiment of this application. Figure 1 As shown, the specific implementation steps of this fresh air handling unit control method are as follows: Step S101: Obtain the fresh air temperature before entering the first heat exchange component, obtain the deep water temperature delivered from the deep water source to the first heat exchange component, and obtain the target air supply temperature corresponding to the air supply outlet of the fresh air unit.

[0021] The fresh air handling unit control method provided in this application can be applied to scenarios requiring the introduction and treatment of outdoor fresh air, such as buildings, equipment rooms, underground spaces, and buildings in remote mountainous areas. It is particularly suitable for application environments with deep reservoirs, groundwater bodies, or other sources of deep water. The execution entity of this method can be the controller of the fresh air handling unit of an energy-saving air conditioner. The controller can be set up independently or integrated into the control cabinet of the fresh air handling unit. It is used to acquire temperature detection data and control the operation of the first heat exchange component, the second heat exchange component, the blower, the air valve, and the water control valve.

[0022] The first heat exchange component refers to a heat exchanger that uses deep water to exchange heat with fresh air, and can be a first surface cooler with an air side and a water side. The second heat exchange component refers to a heat exchanger that uses chilled water or hot water to supplement the heat exchange of the fresh air after the first heat exchange treatment, and can be a second surface cooler with an air side and a medium side. The first and second heat exchange components can be arranged sequentially along the direction of fresh air flow.

[0023] Fresh air temperature refers to the temperature of fresh air before it enters the air side of the first heat exchange component; deep water temperature refers to the temperature of deep water before it is transported from the deep water source to the water side of the first heat exchange component; deep water source refers to a water source whose water intake is located deep within the target water body and can supply water to the first heat exchange component; target supply air temperature refers to the target temperature of the fresh air after treatment set for the air outlet of the fresh air unit.

[0024] In this embodiment, a first temperature detection component can be installed on the air inlet side of the first heat exchange component to detect the temperature of the fresh air before it enters the first heat exchange component; a second temperature detection component can be installed on the deep water supply pipeline between the deep water source and the first heat exchange component to detect the temperature of the deep water supplied to the first heat exchange component. The controller can also obtain the target supply air temperature from the local setting interface, the upper control device, or pre-stored operating parameters.

[0025] For example, the fresh air temperature can be 32 degrees Celsius, the deep water temperature can be 18 degrees Celsius, and the target supply air temperature can be set to 24 degrees Celsius.

[0026] Step S102: Determine the target heat exchange direction based on the fresh air temperature and the target supply air temperature, and when the first temperature difference between the fresh air temperature and the deep water temperature reaches the preset temperature difference, and the actual heat exchange direction between the deep water and the fresh air is consistent with the target heat exchange direction, control the first heat exchange component to use the deep water to perform the first heat exchange treatment on the fresh air.

[0027] The target heat exchange direction refers to the direction of temperature change required to adjust the fresh air temperature to the target supply air temperature, including the direction of decreasing the fresh air temperature and the direction of increasing the fresh air temperature; the first temperature difference refers to the absolute value of the difference between the fresh air temperature and the deep water temperature; the preset temperature difference refers to the minimum temperature difference required for the deep water to effectively exchange heat with the fresh air through the first heat exchange component; and the actual heat exchange direction refers to the actual heat transfer direction determined based on the high-low relationship between the fresh air temperature and the deep water temperature.

[0028] The first heat exchange process involves allowing deep water to flow through the water side of the first heat exchange component and fresh air to flow through the air side of the first heat exchange component, so that the isolated deep water and fresh air exchange heat through the heat exchange walls of the first heat exchange component. The deep water and fresh air do not mix directly within the first heat exchange component.

[0029] In this embodiment, the controller compares the fresh air temperature with the target supply air temperature. When the fresh air temperature is higher than the target supply air temperature, the direction of lowering the fresh air temperature can be determined as the target heat exchange direction; when the fresh air temperature is lower than the target supply air temperature, the direction of raising the fresh air temperature can be determined as the target heat exchange direction. The controller calculates the absolute value of the difference between the fresh air temperature and the deep water temperature to obtain a first temperature difference, and determines whether the first temperature difference reaches a preset temperature difference. The preset temperature difference can be preset according to the heat exchange capacity of the first heat exchange component, the deep water flow rate, and the fresh air flow rate, for example, it can be set to 6 degrees Celsius.

[0030] When the fresh air temperature is higher than the deep water temperature, heat can be transferred from the fresh air to the deep water, with the actual heat exchange direction being the direction that lowers the fresh air temperature. When the deep water temperature is higher than the fresh air temperature, heat can be transferred from the deep water to the fresh air, with the actual heat exchange direction being the direction that raises the fresh air temperature. When the first temperature difference reaches the preset temperature difference, and the actual heat exchange direction is consistent with the target heat exchange direction, the controller controls the deep water supply pipeline to open, allowing the deep water to flow through the first heat exchange component, so that the fresh air undergoes the first heat exchange treatment through the first heat exchange component.

[0031] For example, if the fresh air temperature is 32 degrees Celsius and the target supply air temperature is 24 degrees Celsius, then the target heat exchange direction is the direction that lowers the fresh air temperature. The deep water temperature is 18 degrees Celsius, the first temperature difference is 14 degrees Celsius, which is 6 degrees Celsius greater than the preset temperature difference, and heat is transferred from the fresh air to the deep water. Therefore, the actual heat exchange direction is consistent with the target heat exchange direction. In this case, the controller directs the deep water to enter the first heat exchange component to lower the fresh air temperature.

[0032] For example, if the fresh air temperature is 5 degrees Celsius, the target supply air temperature is 20 degrees Celsius, and the deep water temperature is 13 degrees Celsius, then the target heat exchange direction is the direction of increasing the fresh air temperature, and the actual heat exchange direction is the direction of transferring heat from the deep water to the fresh air. When the first temperature difference reaches the preset temperature difference, the controller can control the first heat exchange component to use the deep water to increase the fresh air temperature.

[0033] Step S103: Obtain the outlet air temperature after the first heat exchange treatment, and control the second heat exchange component to perform a second heat exchange treatment on the fresh air based on the second temperature difference between the outlet air temperature and the target supply air temperature.

[0034] Among them, the outlet air temperature refers to the temperature of the fresh air after it has undergone the first heat exchange treatment by the first heat exchange component and before it enters the second heat exchange component; the second temperature difference refers to the absolute value of the difference between the outlet air temperature and the target supply air temperature; the second heat exchange treatment refers to the second heat exchange component using chilled water or hot water to further cool or heat the fresh air after the first heat exchange treatment.

[0035] In this embodiment, a third temperature detection component can be installed between the first heat exchange component and the second heat exchange component to detect the outlet air temperature after the first heat exchange treatment. The controller calculates the absolute value of the difference between the outlet air temperature and the target supply air temperature to obtain a second temperature difference, and compares the second temperature difference with a preset temperature deviation.

[0036] When the outlet air temperature is higher than the target supply air temperature and the second temperature difference reaches the preset temperature deviation, it indicates that the fresh air temperature after the first heat exchange treatment is still too high. The controller then controls the chilled water to flow through the second heat exchange component to further reduce the fresh air temperature. When the outlet air temperature is lower than the target supply air temperature and the second temperature difference reaches the preset temperature deviation, it indicates that the fresh air temperature after the first heat exchange treatment is still too low. The controller then controls the hot water to flow through the second heat exchange component to further increase the fresh air temperature.

[0037] If the second temperature difference does not reach the preset temperature deviation, it means that the outlet air temperature after the first heat exchange treatment is already within the allowable temperature range corresponding to the target supply air temperature. The controller can then not start the second heat exchange component, thereby avoiding unnecessary consumption of chilled water or hot water.

[0038] For example, if the target supply air temperature is 24 degrees Celsius, and the outlet air temperature after the first heat exchange is 27 degrees Celsius, with a preset temperature deviation of 1 degree Celsius, then the second temperature difference is 3 degrees Celsius. The controller can control the flow of chilled water through the second heat exchange component to further reduce the fresh air temperature to near the target supply air temperature.

[0039] As can be seen from the above, this embodiment determines whether the deep water is suitable for heat exchange based on the fresh air temperature, the deep water temperature, and the target supply air temperature. When the deep water meets the heat exchange conditions, the first heat exchange treatment is performed first, and then the second heat exchange treatment is performed based on the outlet air temperature after the first heat exchange treatment. This can avoid ineffective heat exchange or reverse heat exchange, reduce the operating load of the second heat exchange component, and improve the adjustment accuracy and stability of the supply air temperature.

[0040] In one possible implementation, a specific process for determining the target heat exchange direction based on the fresh air temperature and the target supply air temperature is described. This specific implementation process can be a subordinate implementation of step S102, and specifically includes the following steps: Step S201: When the fresh air temperature is higher than the sum of the target supply air temperature and the preset temperature deviation, the fresh air unit is determined to be in summer operation mode, and the direction of reducing the fresh air temperature is determined as the target heat exchange direction.

[0041] Among them, the preset temperature deviation refers to the allowable temperature fluctuation value set based on the target supply air temperature; the summer operation condition refers to the operation condition in which the fresh air temperature is higher than the upper limit corresponding to the target supply air temperature, and the fresh air needs to be cooled down.

[0042] In this embodiment, the controller adds the target supply air temperature to the preset temperature deviation to obtain the upper limit of the target temperature range, and compares the fresh air temperature with this upper limit. When the fresh air temperature is higher than the upper limit, it is determined that the current fresh air temperature needs to be reduced, thereby determining that the fresh air unit is in summer operating condition, and the direction of reducing the fresh air temperature is determined as the target heat exchange direction.

[0043] For example, if the target supply air temperature is 24 degrees Celsius and the preset temperature deviation is 2 degrees Celsius, then the upper limit of the target temperature range is 26 degrees Celsius. When the fresh air temperature is 32 degrees Celsius, the fresh air temperature is higher than this upper limit, and the controller determines that the fresh air handling unit is in summer operating condition.

[0044] Step S202: When the fresh air temperature is lower than the difference between the target supply air temperature and the preset temperature deviation, the fresh air unit is determined to be in winter operation mode, and the direction of increasing the fresh air temperature is determined as the target heat exchange direction.

[0045] Among them, the winter operation condition refers to the operation condition in which the fresh air temperature is lower than the lower limit of the target supply air temperature, and the fresh air needs to be treated to increase the temperature.

[0046] In this embodiment, the controller subtracts a preset temperature deviation from the target supply air temperature to obtain the lower limit of the target temperature range, and compares the fresh air temperature with this lower limit. When the fresh air temperature is lower than this lower limit, it is determined that the current fresh air temperature needs to be increased, thereby determining that the fresh air unit is in winter operating condition, and the direction of increasing the fresh air temperature is determined as the target heat exchange direction.

[0047] For example, if the target supply air temperature is 24 degrees Celsius and the preset temperature deviation is 2 degrees Celsius, then the lower limit of the target temperature range is 22 degrees Celsius. When the fresh air temperature is 10 degrees Celsius, the controller determines that the fresh air handling unit is in winter operating condition.

[0048] Step S203: When the fresh air temperature is within the temperature range determined by the deviation between the target supply air temperature and the preset temperature, control the first heat exchange component and the second heat exchange component to maintain the current operating state or stop heat exchange.

[0049] The temperature range determined by the deviation between the target supply air temperature and the preset temperature refers to the temperature range between the difference between the target supply air temperature and the preset temperature deviation and the sum of the target supply air temperature and the preset temperature deviation; the operating conditions within this temperature range can be used as the operating conditions for the transitional season.

[0050] In this embodiment, when the fresh air temperature is within the specified temperature range, it can be determined that the fresh air temperature meets the current air supply requirements. If the first heat exchange component and the second heat exchange component are not currently exchanging heat, the heat exchange stop state is maintained; if the first heat exchange component or the second heat exchange component is operating, the current operating state can be maintained according to a preset control strategy, or heat exchange can be stopped after the fresh air temperature stabilizes.

[0051] For example, when the target supply air temperature is 24 degrees Celsius and the preset temperature deviation is 2 degrees Celsius, the fresh air temperature is between 22 degrees Celsius and 26 degrees Celsius, which indicates that the fresh air unit is in the transitional season operating condition.

[0052] As can be seen from the above, by setting the upper and lower temperature boundaries corresponding to the target supply air temperature, it is possible to distinguish between summer operation conditions, winter operation conditions and transitional season operation conditions, and reduce the frequent start-up and shutdown of the first and second heat exchange components when the fresh air temperature fluctuates around the target supply air temperature.

[0053] In one possible implementation, a specific process is described for controlling a first heat exchange component to perform a first heat exchange treatment based on a first temperature difference, the actual heat exchange direction, and the target heat exchange direction. This specific implementation process can be a subordinate implementation of step S102, and specifically includes the following steps: Step S301: Calculate the absolute value of the difference between the fresh air temperature and the deep water temperature to obtain the first temperature difference, and compare the first temperature difference with the preset temperature difference.

[0054] The first temperature difference represents the temperature difference between the fresh air and the deep water that allows for heat exchange; the preset temperature difference represents the minimum temperature difference required for the first heat exchange component to effectively exchange heat with the fresh air using the deep water.

[0055] In this embodiment, the controller subtracts the fresh air temperature from the deep water temperature and takes the absolute value of the subtraction result to obtain a first temperature difference. The controller compares the first temperature difference with a preset temperature difference to determine whether there is a sufficient heat exchange temperature difference between the fresh air and the deep water.

[0056] For example, the preset temperature difference can be set to 6 degrees Celsius. When the fresh air temperature is 32 degrees Celsius and the deep water temperature is 18 degrees Celsius, the first temperature difference is 14 degrees Celsius, which achieves the preset temperature difference.

[0057] Step S302: Determine the actual heat exchange direction based on the relationship between the fresh air temperature and the deep water temperature.

[0058] The actual heat exchange direction refers to the direction in which heat can actually be transferred under the current fresh air temperature and deep water temperature conditions.

[0059] In this embodiment, when the fresh air temperature is higher than the deep water temperature, heat is transferred from the side with the higher temperature to the side with the lower temperature; therefore, the direction of heat transfer from the fresh air to the deep water is determined as the actual heat exchange direction. When the deep water temperature is higher than the fresh air temperature, the direction of heat transfer from the deep water to the fresh air is determined as the actual heat exchange direction. When the fresh air temperature is equal to the deep water temperature, there is essentially no effective temperature difference between the fresh air and the deep water; the first temperature difference usually cannot reach the preset temperature difference, therefore the first heat exchange component does not need to be activated.

[0060] Step S303: Determine whether the actual heat exchange direction is consistent with the target heat exchange direction.

[0061] The fact that the actual heat exchange direction is consistent with the target heat exchange direction means that the actual heat transfer that can occur between the deep water and the fresh air can cause the fresh air temperature to change towards the target supply air temperature.

[0062] In this embodiment, when the target heat exchange direction is the direction of reducing the fresh air temperature, and the actual heat exchange direction is the direction of transferring heat from the fresh air to the deep water, the actual heat exchange direction is determined to be consistent with the target heat exchange direction. Similarly, when the target heat exchange direction is the direction of increasing the fresh air temperature, and the actual heat exchange direction is the direction of transferring heat from the deep water to the fresh air, the actual heat exchange direction is also determined to be consistent with the target heat exchange direction.

[0063] For example, under summer operating conditions, the target heat exchange direction is to reduce the fresh air temperature. When the fresh air temperature is higher than the deep water temperature, heat can be transferred from the fresh air to the deep water, so the actual heat exchange direction is consistent with the target heat exchange direction.

[0064] Step S304: When the first temperature difference reaches the preset temperature difference and the actual heat exchange direction is consistent with the target heat exchange direction, control the deep water to flow through the first heat exchange component so that the first heat exchange component can use the deep water to perform the first heat exchange treatment on the fresh air.

[0065] The first heat exchange component may include an air side and a water side that are isolated from each other and capable of heat transfer. Fresh air flows through the air side and deep water flows through the water side, and the two transfer heat through the heat exchange wall of the first heat exchange component.

[0066] In this embodiment, the controller controls the water control valve in the deep water supply pipeline to open, so that deep water is transported from the deep water source to the water side of the first heat exchange component; the blower or other air supply components drive fresh air to flow through the air side of the first heat exchange component, thereby performing the first heat exchange treatment through the first heat exchange component.

[0067] For example, under summer operating conditions, the fresh air temperature is 34 degrees Celsius, the deep water temperature is 19 degrees Celsius, the first temperature difference is 15 degrees Celsius, and the actual heat exchange direction is from the fresh air to the deep water. Since the target heat exchange direction is to reduce the fresh air temperature, the controller opens the deep water supply pipeline, allowing the deep water to flow through the first heat exchange component.

[0068] For example, under winter operating conditions, the fresh air temperature is 4 degrees Celsius, the deep water temperature is 13 degrees Celsius, and the initial temperature difference is 9 degrees Celsius. The actual heat exchange direction is from the deep water to the fresh air. Since the target heat exchange direction is to increase the fresh air temperature, the first heat exchange component can utilize the deep water to raise the fresh air temperature.

[0069] As can be seen from the above, by simultaneously judging the first temperature difference and the heat exchange direction, the first heat exchange component can be avoided when the temperature difference is insufficient or the actual heat exchange direction does not meet the fresh air conditioning requirements, thereby improving the effective utilization rate of deep water.

[0070] In one possible implementation, a specific implementation process is described for controlling the second heat exchange component to perform a second heat exchange treatment based on a second temperature difference between the outlet air temperature and the target supply air temperature. This specific implementation process can be a subordinate implementation of step S103, and specifically includes the following steps.

[0071] Step S401: Obtain the temperature of the fresh air output from the first heat exchange component and before entering the second heat exchange component, and use it as the outlet air temperature.

[0072] The outlet air temperature refers to the temperature of the fresh air after it has undergone the first heat exchange treatment by the first heat exchange component and before it enters the second heat exchange component.

[0073] In this embodiment, a temperature detection component can be provided between the air outlet side of the first heat exchange component and the air inlet side of the second heat exchange component. The temperature detection component detects the temperature of the fresh air after the first heat exchange treatment and uses the detection result as the air outlet temperature.

[0074] Step S402: Calculate the absolute value of the difference between the outlet air temperature and the target supply air temperature to obtain the second temperature difference, and compare the second temperature difference with the preset temperature deviation.

[0075] The second temperature difference is used to indicate the degree of deviation of the outlet air temperature after the first heat exchange treatment from the target supply air temperature.

[0076] In this embodiment, the controller subtracts the outlet air temperature from the target supply air temperature and takes the absolute value of the subtraction result to obtain a second temperature difference. The controller compares the second temperature difference with a preset temperature deviation to determine whether the second heat exchange component needs to be activated.

[0077] Step S403: When the outlet air temperature is higher than the target supply air temperature and the second temperature difference reaches the preset temperature deviation, control the chilled water to flow through the second heat exchange component so that the second heat exchange component performs a second heat exchange treatment to reduce the temperature of the fresh air after the first heat exchange treatment.

[0078] Chilled water refers to a low-temperature heat exchange medium provided by a cold water source and used to absorb heat from fresh air; the second heat exchange component may include an air side and a medium side, with fresh air flowing through the air side and chilled water flowing through the medium side.

[0079] In this embodiment, when the outlet air temperature is higher than the target supply air temperature and the second temperature difference reaches a preset temperature deviation, the controller controls the connection of the pipeline between the chilled water source and the second heat exchange component, allowing chilled water to flow through the medium side of the second heat exchange component. When the fresh air after the first heat exchange treatment flows through the air side of the second heat exchange component, the heat of the fresh air is transferred to the chilled water to further reduce the fresh air temperature.

[0080] For example, if the target supply air temperature is 24 degrees Celsius, the outlet air temperature is 27 degrees Celsius, and the preset temperature deviation is 1 degree Celsius, then the second temperature difference is 3 degrees Celsius, and the controller controls the chilled water to flow through the second heat exchange component.

[0081] Step S404: When the outlet air temperature is lower than the target supply air temperature and the second temperature difference reaches the preset temperature deviation, control the hot water to flow through the second heat exchange component so that the second heat exchange component can perform a second heat exchange treatment to increase the temperature of the fresh air after the first heat exchange treatment.

[0082] Hot water refers to a high-temperature heat exchange medium provided by a hot water source and used to release heat to fresh air.

[0083] In this embodiment, when the outlet air temperature is lower than the target supply air temperature and the second temperature difference reaches the preset temperature deviation, the controller controls the pipe between the hot water source and the second heat exchange component to open, allowing hot water to flow through the medium side of the second heat exchange component. The hot water transfers heat to the fresh air through the second heat exchange component to further increase the fresh air temperature.

[0084] For example, if the target supply air temperature is 20 degrees Celsius, the outlet air temperature is 16 degrees Celsius, and the preset temperature deviation is 1 degree Celsius, then the second temperature difference is 4 degrees Celsius, and the controller controls the hot water to flow through the second heat exchange component.

[0085] Step S405: When the second temperature difference does not reach the preset temperature deviation, control the second heat exchange component not to perform the second heat exchange process.

[0086] The second temperature difference not reaching the preset temperature deviation means that the air supply temperature is already within the allowable temperature range corresponding to the target air supply temperature.

[0087] In this embodiment, the controller shuts off the pipeline between the cold water source and the second heat exchange component, as well as the pipeline between the hot water source and the second heat exchange component, or keeps the second heat exchange component in a stopped state to avoid repeated heat exchange or excessive heat exchange.

[0088] As can be seen from the above, the second heat exchange component only compensates for the heat exchange that the first heat exchange component failed to complete, which can reduce the consumption of chilled water or hot water and improve the utilization efficiency of the heat exchange medium.

[0089] In one possible implementation, a specific process for switching the fresh air flow path and the deep water flow path according to the power supply status of the fresh air handling unit is described. The fresh air handling unit also includes a conventional air duct, an emergency air duct, a blower installed in the conventional air duct, and a hydraulically driven blower installed in the emergency air duct. The first heat exchange component and the second heat exchange component are installed in the conventional air duct along the fresh air flow direction. The specific steps include the following.

[0090] Step S501: When the power supply status of the fresh air unit is normal, control the air supply fan to drive the fresh air to flow through the first heat exchange component and the second heat exchange component in sequence, so as to perform the first heat exchange treatment and the second heat exchange treatment on the fresh air.

[0091] Among them, conventional air duct refers to an air channel equipped with a first heat exchange component, a second heat exchange component, and a blower, which supplies fresh air under normal power supply conditions; blower refers to a fan that is driven by electricity to flow fresh air in conventional air duct.

[0092] In this embodiment, under normal power supply conditions, the first air valve located in the conventional air duct opens, the second air valve located in the emergency air duct closes, and the blower starts. The blower drives fresh air to flow sequentially through the first heat exchange component and the second heat exchange component along the conventional air duct.

[0093] The first heat exchange component selectively uses deep water to perform a first heat exchange treatment on the fresh air according to the judgment result described in step S102; the second heat exchange component selectively uses chilled water or hot water to perform a second heat exchange treatment on the fresh air according to the judgment result described in step S103.

[0094] Step S502: When the power supply status of the fresh air handling unit changes from normal power supply status to power failure status, control the air supply fan to stop running, close the regular air duct and open the emergency air duct so that fresh air enters the emergency air duct.

[0095] Among them, the emergency air duct refers to the air passage that supplies fresh air flow in the event of a power outage and bypasses the first and second heat exchange components.

[0096] In this embodiment, when a power outage is detected in the fresh air unit, the blower stops operating due to the power interruption, the first air valve closes, and the second air valve opens, switching the flow path of the fresh air from the conventional air duct to the emergency air duct.

[0097] The first and second air valves can be power-off reset type valves. The first air valve can be a power-off closed type valve, and the second air valve can be a power-off open type valve, so that when the external power supply is interrupted, the air duct switching can be completed by spring reset or other mechanical reset structure, without relying on continuous power supply.

[0098] Step S503: Switch the deep water supply pipeline connected to the first heat exchange component to the hydraulic drive branch connected to the hydraulic drive fan, and use the water head pressure formed by the deep water to drive the hydraulic drive fan to send the fresh air flowing through the emergency air duct into the room.

[0099] Among them, the deep water supply pipeline refers to the water passage between the deep water source and the first heat exchange component; the hydraulic drive branch refers to the water passage between the deep water source and the hydraulic drive fan; the hydraulic drive fan refers to the fan that uses fluid pressure to drive the impeller to rotate and drive the air flow; the head pressure refers to the fluid pressure formed by the height difference between the water level of the deep water source and the drainage end of the hydraulic drive branch.

[0100] In this embodiment, when the power supply state is switched to the power-off state, the deep water supply pipeline connected to the first heat exchange component is closed, and the hydraulic drive branch connected to the hydraulic drive fan is opened, so that the deep water is switched from the deep water supply pipeline to the hydraulic drive branch.

[0101] Deep water can originate from high-altitude deep reservoirs, and the drainage end of the hydraulically driven branch can be connected to a reservoir located at a lower position. As deep water flows from a high water level to a low water level, it creates head pressure. The hydraulically driven fan converts the energy of the water flow into the mechanical energy required for the fan to rotate, thereby driving fresh air flowing through the emergency ventilation duct into the room.

[0102] As can be seen from the above, in the event of a power outage, by switching the air duct and the deep water flow path, the water head pressure formed by the deep water can be used to replace the electric power to drive the air supply and maintain the basic fresh air supply in the room.

[0103] In one possible implementation, a specific process is described for exchanging heat between fresh air flowing through an emergency air duct using a split heat pipe during a power outage. The fresh air unit also includes a split heat pipe installed in the emergency air duct. The split heat pipe includes an evaporator end located in the emergency air duct and a condenser end connected to the emergency heat exchange branch. The specific steps include the following.

[0104] Step S601: When the power supply status is switched from normal power supply status to power outage status, connect the emergency heat exchange branch to the deep water source so as to introduce some deep water into the emergency heat exchange branch.

[0105] Among them, the emergency heat exchange branch refers to the water circuit that connects the deep water source to the condensing end of the split heat pipe for heat exchange; the split heat pipe refers to a passive heat exchange device in which the evaporation end and the condensing end are set separately and heat is transferred through the internal heat exchange medium.

[0106] In this embodiment, when the power supply state is switched to the power outage state, the water control valve set in the emergency heat exchange branch is opened, allowing a portion of the deep water to enter the emergency heat exchange branch from the deep water source; another portion of the deep water can enter the hydraulic drive branch to drive the hydraulic drive fan to operate.

[0107] The water circuit control valve in the emergency heat exchange branch can be a power failure-opening valve, so that the emergency heat exchange branch can be automatically opened through mechanical reset when the power is cut off.

[0108] Step S602: The deep water flowing through the emergency heat exchange branch exchanges heat with the condenser end, so that the heat exchange medium in the split heat pipe absorbs the heat of the fresh air flowing through the emergency air duct at the evaporation end and transfers the heat to the condenser end.

[0109] Among them, the evaporator end refers to the heat exchange end set in the emergency air duct for absorbing the heat of fresh air; the condenser end refers to the heat exchange end connected to the emergency heat exchange branch for transferring the heat carried by the heat exchange medium to the deep water; the heat exchange medium refers to the medium sealed inside the split heat pipe that can circulate between the evaporator end and the condenser end and transfer heat.

[0110] In this embodiment, when fresh air flows through the evaporator end of the split heat pipe, the heat exchange medium inside the split heat pipe absorbs the heat from the fresh air and transfers the absorbed heat to the condenser end. The deep water flowing through the emergency heat exchange branch exchanges heat with the condenser end, carrying away the heat released by the condenser end, so that the heat exchange medium returns to the evaporator end after condensation or cooling, thus forming a circulating heat exchange process.

[0111] The deep water is isolated from the heat exchange medium inside the split heat pipe. The two exchange heat through the heat exchange wall at the condenser end, and the deep water does not directly enter the interior of the split heat pipe.

[0112] Step S603: Use a water-driven fan to send the fresh air, which has undergone heat exchange at the evaporator end, into the room.

[0113] Among them, the fresh air after heat exchange at the evaporator end refers to the fresh air that flows through the evaporator end of the split heat pipe and transfers at least part of the heat to the heat exchange medium.

[0114] In this embodiment, the deep water entering the hydraulic drive branch forms a head pressure and drives the hydraulic drive fan. The hydraulic drive fan causes the external fresh air to flow through the evaporator end of the split heat pipe to complete heat exchange, and then the heat-exchanged fresh air is delivered to the room along the emergency air duct.

[0115] For example, during a power outage in summer, the temperature of the fresh air is higher than that of the deep water. The evaporator end of the split heat pipe absorbs the heat from the fresh air, and the condenser end transfers the heat to the deep water, thereby reducing the temperature of the fresh air flowing through the emergency air duct. The hydraulically driven fan then delivers the cooled fresh air into the room.

[0116] As can be seen from the above, the combination of split heat pipes and water-driven fans can simultaneously achieve emergency heat exchange and emergency air supply using deep water without external power, thereby improving the operational reliability of the fresh air unit in the event of a power outage.

[0117] In one possible implementation, a fresh air handling unit control system is described, specifically including: The fresh air handling unit control system provided in this application includes a fresh air handling unit, a deep water source, and a controller.

[0118] The fresh air handling unit includes a conventional air duct, an emergency air duct, a first heat exchange component, a second heat exchange component, a supply fan, a split heat pipe, and a hydraulically driven fan. The conventional air duct and the emergency air duct connect the air intake side and the air supply side of the fresh air handling unit, respectively, to form two fresh air flow paths that can be switched between each other.

[0119] The first heat exchange component, the second heat exchange component, and the blower are sequentially arranged in the conventional air duct along the direction of fresh air flow. The first heat exchange component is used to perform a first heat exchange treatment on the fresh air using deep water; the second heat exchange component is used to perform a second heat exchange treatment on the fresh air after the first heat exchange treatment using chilled water or hot water; and the blower is used to drive the fresh air to flow along the conventional air duct under normal power supply conditions.

[0120] The first heat exchange component includes an air side and a water side that are isolated from each other and capable of transferring heat. The air side of the first heat exchange component is connected to a conventional air duct for supplying fresh air; the water side of the first heat exchange component is connected to a deep water source via a deep water supply pipeline for receiving deep water. Fresh air and deep water flow through the air side and water side of the first heat exchange component, respectively, and exchange heat through the heat exchange walls of the first heat exchange component.

[0121] The second heat exchange component includes an air side and a medium side that are isolated from each other and capable of transferring heat. The air side of the second heat exchange component is connected to a conventional air duct and is located downstream of the first heat exchange component; the medium side of the second heat exchange component is connected to a cold water source or a hot water source.

[0122] The cold water source can be a chilled water source used to provide chilled water, and the hot water source can be a hot water source used to provide hot water. When the outlet air temperature after the first heat exchange treatment is higher than the target supply air temperature, the cold water source provides chilled water to the second heat exchange component; when the outlet air temperature is lower than the target supply air temperature, the hot water source provides hot water to the second heat exchange component.

[0123] The blower is located downstream of the second heat exchange component and is used to drive fresh air to flow sequentially through the first and second heat exchange components under normal power supply conditions, and to deliver the treated fresh air to the air outlet of the fresh air unit.

[0124] The separate heat pipe and hydraulically driven fan are installed in the emergency air duct. The separate heat pipe includes an evaporator end and a condenser end. The evaporator end is located in the emergency air duct and is used to absorb the heat of the fresh air flowing through the emergency air duct. The condenser end is connected to the deep water source for heat exchange through an emergency heat exchange branch, and is used to transfer the heat absorbed by the evaporator end to the deep water flowing through the emergency heat exchange branch.

[0125] The hydraulically driven fan is connected to the deep water source through a hydraulic drive branch. As the deep water flows along the hydraulic drive branch, it generates head pressure. The hydraulically driven fan converts the hydraulic energy of the deep water into mechanical energy to drive the fan to rotate, thereby driving the flow of fresh air into the air outlet in the emergency ventilation duct.

[0126] A first air valve is installed in the conventional air duct, and a second air valve is installed in the emergency air duct. The first air valve controls the opening and closing of the conventional air duct, and the second air valve controls the opening and closing of the emergency air duct. Under normal power supply conditions, the first air valve is open and the second air valve is closed; under power failure conditions, the first air valve is closed and the second air valve is open.

[0127] The deep water supply pipeline, emergency heat exchange branch, and hydraulic drive branch are each equipped with a water circuit control valve. The water circuit control valve in the deep water supply pipeline is used to control whether deep water flows into the first heat exchange component; the water circuit control valve in the emergency heat exchange branch is used to control whether deep water flows through the condenser end of the split heat pipe; and the water circuit control valve in the hydraulic drive branch is used to control whether deep water flows into the hydraulic drive fan.

[0128] In one possible implementation, the water control valve in the deep water supply pipeline can be a power failure shut-off valve, and the water control valves in the emergency heat exchange branch and the hydraulic drive branch can be power failure open valves, so that the deep water can automatically switch from the first heat exchange component to the separate heat pipe and hydraulic drive fan when the power is cut off.

[0129] The controller is connected to the first heat exchange component, the second heat exchange component, the blower, the first air valve, the second air valve, and each water circuit control valve. The controller can also be connected to temperature detection components located on the air inlet side of the first heat exchange component, the deep water supply pipeline, and the air outlet side of the first heat exchange component to obtain the fresh air temperature, deep water temperature, and air outlet temperature, respectively.

[0130] Under normal power supply conditions, the controller controls the first heat exchange component to perform the first heat exchange treatment based on the fresh air temperature, the deep water temperature and the target supply air temperature, and controls the second heat exchange component to selectively receive chilled water or hot water based on the second temperature difference between the outlet air temperature and the target supply air temperature, so as to perform the second heat exchange treatment on the fresh air.

[0131] In the event of a power outage, the blower stops operating, the first air valve closes, the second air valve opens, the deep water supply line closes, and the emergency heat exchange branch and the hydraulic drive branch are connected. The split heat pipe utilizes the deep water flowing through the emergency heat exchange branch to perform emergency heat exchange on the fresh air, and the hydraulic drive fan utilizes the head pressure formed by the deep water flowing through the hydraulic drive branch to deliver emergency air.

[0132] As can be seen from the above, the fresh air handling unit control system provided in this application embodiment can utilize deep water and supplementary heat exchange medium in a cascade manner under normal power supply conditions, and can maintain emergency heat exchange and air supply through separate heat pipes and hydraulically driven fans under power failure conditions, thereby reducing the operating energy consumption during the fresh air temperature regulation process and improving the operating reliability of the fresh air handling unit.

[0133] like Figure 2 The diagram shows a schematic of a fresh air handling unit control system according to an embodiment of this application. The fresh air handling unit is located between outdoor air and indoor air and includes conventional air ducts and emergency air ducts connected in parallel. The lower channel in the diagram is the conventional air duct, and along the flow direction of outdoor air towards the indoor air are arranged a pneumatic damper 1, a temperature and humidity sensor 1, an air filter, a surface cooler 1, a surface cooler 2, a blower, and the temperature and humidity sensor 2. The surface cooler 1 can serve as a first heat exchange component, with its water side connected to a deep water source for first heat exchange treatment of the fresh air using deep water. The surface cooler 2 can serve as a second heat exchange component, with its medium side selectively connected to a chilled water source or a hot water source for second heat exchange treatment of the fresh air based on the outlet air temperature after the first heat exchange treatment. The blower, under normal power supply conditions, drives outdoor air to flow sequentially through the air filter, surface cooler 1, and surface cooler 2, and delivers the treated fresh air to the indoor air. The air filter removes particulate matter from the fresh air to reduce the impact of impurities on the surface cooler and indoor air quality. Temperature and humidity sensor 1 is used to obtain the fresh air temperature, and temperature and humidity sensor 2 is used to obtain the supply air temperature.

[0134] The upper passage in the diagram is an emergency air duct. Along the direction of outdoor air flow towards the interior, pneumatic damper 2, a separate heat pipe, and a hydraulically driven fan are sequentially arranged. The separate heat pipe is used to exchange heat with the fresh air flowing through the emergency air duct in the event of a power outage. The hydraulically driven fan uses the head pressure formed by deep water to drive the fresh air into the interior. Under normal power supply conditions, pneumatic damper 1 is open and pneumatic damper 2 is closed, allowing outdoor air to enter the interior along the regular air duct. When the power supply switches to a power outage state, pneumatic damper 1 closes and pneumatic damper 2 opens, causing outdoor air to bypass surface cooler 1, surface cooler 2, and the blower, instead entering the interior via the separate heat pipe and the hydraulically driven fan.

[0135] like Figure 3 The diagram shows another structural schematic of a fresh air handling unit control system provided in this application embodiment. The deep water source can be a high-altitude deep reservoir, which includes surface water in the upper part of the water body and deep water in the lower part. The fresh air handling unit draws or diverts the deep water through a water intake pipe. Since the temperature of the deep water is relatively stable, and there is a height difference between the high-altitude deep reservoir and the bottom reservoir, the deep water can serve as both a heat exchange medium and a hydraulic drive medium. The deep water output from the high-altitude deep reservoir flows sequentially through a primary filter and a secondary filter to remove large particulate impurities and fine suspended solids, reducing the possibility of clogging. Simultaneously, the temperature of the deep water is obtained through a temperature and humidity sensor 3.

[0136] In this embodiment, the filtered deep water pipeline is divided into a conventional heat exchange branch, an emergency heat exchange branch, and a hydraulically driven branch. The conventional heat exchange branch is equipped with a one-way valve 1 and a magnetic control valve 1, and is connected to the surface cooler 1 inside the conventional unit. The emergency heat exchange branch is equipped with a one-way valve 3 and a magnetic control valve 2, and is connected to the condenser end of the split heat pipe for heat exchange. The hydraulically driven branch is equipped with a one-way valve 2 and a magnetic control valve 3, and is connected to the hydraulically driven fan. One-way valves 1, 2, and 3 are used to restrict the flow of deep water in their respective branches in a predetermined direction to prevent backflow between branches. Magnetic control valves 1, 2, and 3 are used to control the on / off state of their respective branches.

[0137] When the fresh air handling unit is under normal power supply, magnetic control valve 1 opens, while magnetic control valves 2 and 3 close, allowing deep water to flow into surface cooler 1 via the conventional heat exchange branch. Surface cooler 1 serves as the first heat exchange component, with deep water flowing through its water side and fresh air flowing through its air side. The deep water and fresh air are isolated from each other and undergo primary heat exchange through surface cooler 1. The conventional unit also includes an air filter, surface cooler 2, and a blower along the fresh air flow direction. Surface cooler 2 serves as the second heat exchange component, used to perform secondary heat exchange on the fresh air using chilled or hot water when the heat exchange capacity of surface cooler 1 is insufficient. The corresponding chilled or hot water circulation piping for surface cooler 2 can be separately installed and is not specifically shown in this diagram. After heat exchange, the deep water flows into the bottom water storage tank via the drainage pipe.

[0138] When the fresh air handling unit switches from normal power supply to power failure, magnetic control valve 1 closes due to de-energization, while magnetic control valves 2 and 3 open, stopping the flow of deep water into the surface cooler 1 and directing it into the emergency heat exchange branch and the hydraulic drive branch, respectively. The deep water entering the emergency heat exchange branch flows through the condenser end of the split heat pipe, carrying away the heat transferred from the heat exchange medium inside the split heat pipe to the condenser end. The evaporator end of the split heat pipe is located inside the emergency standby unit, absorbing the heat from the fresh air flowing through it, thus providing emergency heat exchange for the fresh air. The deep water entering the hydraulic drive branch utilizes the height difference between the high-altitude deep reservoir and the bottom water tank to create head pressure, which drives the hydraulic drive fan to deliver the fresh air, after heat exchange through the split heat pipe, into the room.

[0139] Furthermore, the deep water in the emergency heat exchange branch and the hydraulic drive branch can be discharged into the bottom water storage tank after completing heat exchange or hydraulic drive. Thus, under normal power supply conditions, the deep water is used for the first heat exchange treatment of the surface cooler 1; under power failure conditions, the deep water is used for emergency heat exchange of the split heat pipe and emergency air supply of the hydraulic drive fan, respectively, realizing the separate utilization of deep water under different operating conditions.

[0140] like Figure 4 The diagram shows a flow chart of another fresh air handling unit control method provided in this application embodiment. After the fresh air handling unit is turned on, the pneumatic air valve 1 is opened and the air supply fan is started, allowing outdoor fresh air to enter the conventional air duct. Temperature detection is performed according to a preset detection cycle to obtain the fresh air temperature Tx, the supply air temperature Tc, and the deep water temperature Ts. Here, Tx represents the fresh air temperature before entering the first heat exchange component, Tc represents the supply air temperature detected after processing by the fresh air handling unit, Ts represents the deep water temperature delivered from the deep water source to the first heat exchange component, Tp represents the target supply air temperature, ΔT represents the preset temperature deviation set based on the target supply air temperature, and t represents the preset detection time between two adjacent temperature detections.

[0141] In this embodiment, the controller first determines whether the supply air temperature Tc is within the target temperature range determined by the target supply air temperature Tp and the preset temperature deviation ΔT, i.e., whether it satisfies Tp-ΔT≤Tc≤Tp+ΔT. If this condition is met, it indicates that the current supply air temperature meets the supply air requirements, and the fresh air unit maintains its current operating state. After a preset detection time t, the fresh air temperature Tx, supply air temperature Tc, and deep water temperature Ts are re-acquired to form periodic detection and feedback control. If the supply air temperature Tc is not within the target temperature range, the controller further determines whether there is a cooling or heating requirement for the current fresh air based on the fresh air temperature Tx.

[0142] When the fresh air temperature Tx is higher than the sum of the target supply air temperature Tp and the preset temperature deviation ΔT, it can be determined that the fresh air unit is in cooling operation mode, and cooling dehumidification control is activated. Furthermore, when the deep water temperature Ts is lower than the fresh air temperature Tx, and the temperature difference between the fresh air temperature Tx and the deep water temperature Ts reaches a preset value, for example, Tx ≥ Ts + 6 degrees Celsius, it indicates that the deep water has the ability to cool and heat the fresh air. The magnetic control valve 1 can then be opened, allowing the deep water to flow through the surface cooler 1, and the surface cooler 1 can be activated to perform the first heat exchange treatment on the fresh air. The surface cooler 1 can serve as the first heat exchange component, with the fresh air and deep water flowing through the air side and water side of the surface cooler 1 respectively, and exchanging heat through the heat exchange walls of the surface cooler 1.

[0143] After the initial heat exchange treatment of the fresh air using surface cooler 1, surface cooler 2 can be further controlled based on the supply air temperature Tc. Specifically, when the supply air temperature Tc is higher than the sum of the target supply air temperature Tp and the preset temperature deviation ΔT, it indicates that the fresh air temperature after treatment by surface cooler 1 is still too high. Surface cooler 2 is then activated, and chilled water flows through it to further cool and dehumidify the fresh air. When the supply air temperature Tc is within the target temperature range determined by the target supply air temperature Tp and the preset temperature deviation ΔT, the current operating state of surface cooler 2 is maintained. When the supply air temperature Tc is lower than the difference between the target supply air temperature Tp and the preset temperature deviation ΔT, it indicates that the fresh air temperature has fallen below the allowable lower limit. Surface cooler 2 is then shut down to prevent excessive cooling of the fresh air. After completing the corresponding control, each temperature parameter is re-detected after a preset detection time t, and the operating states of surface coolers 1 and 2 are adjusted based on the latest detection results.

[0144] If the fresh air temperature Tx is not higher than the sum of the target supply air temperature Tp and the preset temperature deviation ΔT, the controller will re-detect the fresh air temperature Tx after a preset detection time t, and determine whether the fresh air temperature Tx is lower than the sum of the target supply air temperature Tp and the preset temperature deviation ΔT. When the fresh air temperature Tx is low and there is a need for heating, the controller will further determine whether the deep water temperature Ts is higher than the fresh air temperature Tx by a preset value, for example, whether Ts ≥ Tx + 6 degrees Celsius.

[0145] When the temperature difference between the deep water temperature Ts and the fresh air temperature Tx reaches the preset value, it indicates that the deep water can transfer heat to the fresh air. The controller then directs the deep water to flow through surface cooler 1 for the first heat exchange treatment of the fresh air, and directs the hot water to flow through surface cooler 2 for supplementary heating of the fresh air after the first heat exchange treatment. When the temperature difference between the deep water temperature Ts and the fresh air temperature Tx does not reach the preset value, it indicates that the heating effect of the deep water on the fresh air is limited. In this case, surface cooler 1 can be left unactivated, and the hot water can flow directly through surface cooler 2 to heat the fresh air.

[0146] Therefore, the heat exchange requirements of the fresh air are determined based on the fresh air temperature Tx, the deep water temperature Ts is used to determine whether the deep water has the corresponding heat exchange capacity, and the operating status of the surface cooler 2 is adjusted based on the supply air temperature Tc, so that the fresh air unit can give priority to using the deep water for the first heat exchange treatment, and supplement the heat exchange through the surface cooler 2 when the first heat exchange treatment is insufficient.

[0147] Figure 5 The diagram shown is a structural schematic of a fresh air handling unit control device provided in an embodiment of this application. The device includes: The acquisition module 51 is used to acquire the fresh air temperature before entering the first heat exchange component of the fresh air unit, the deep water temperature delivered from the deep water source to the first heat exchange component, and the target air supply temperature corresponding to the air supply outlet of the fresh air unit. The first control module 52 is used to determine the target heat exchange direction based on the fresh air temperature and the target supply air temperature, and when the first temperature difference between the fresh air temperature and the deep water temperature reaches the preset temperature difference, and the actual heat exchange direction between the deep water and the fresh air is consistent with the target heat exchange direction, control the first heat exchange component to perform the first heat exchange treatment on the fresh air using deep water. The second control module 53 is used to obtain the outlet air temperature after the first heat exchange treatment, and control the second heat exchange component of the fresh air unit to perform a second heat exchange treatment on the fresh air based on the second temperature difference between the outlet air temperature and the target supply air temperature.

[0148] In one possible implementation, the first control module is specifically used to determine that the fresh air unit is in summer operation mode when the fresh air temperature is higher than the sum of the target supply air temperature and the preset temperature deviation, and to determine the direction of reducing the fresh air temperature as the target heat exchange direction. When the fresh air temperature is lower than the difference between the target supply air temperature and the preset temperature, the fresh air handling unit is determined to be in winter operation mode, and the direction of increasing the fresh air temperature is determined as the target heat exchange direction. When the fresh air temperature is within the temperature range determined by the deviation between the target supply air temperature and the preset temperature, the first heat exchange component and the second heat exchange component are controlled to maintain the current operating state or stop heat exchange.

[0149] In one possible implementation, the first control module is specifically used to calculate the absolute value of the difference between the fresh air temperature and the deep water temperature to obtain a first temperature difference, and compare the first temperature difference with a preset temperature difference. When the fresh air temperature is higher than the deep water temperature, the direction of heat transfer from the fresh air to the deep water is determined as the actual heat exchange direction; when the deep water temperature is higher than the fresh air temperature, the direction of heat transfer from the deep water to the fresh air is determined as the actual heat exchange direction. When the target heat exchange direction is the direction of reducing the fresh air temperature and the actual heat exchange direction is the direction of transferring heat from the fresh air to the deep water, or when the target heat exchange direction is the direction of increasing the fresh air temperature and the actual heat exchange direction is the direction of transferring heat from the deep water to the fresh air, the actual heat exchange direction is determined to be consistent with the target heat exchange direction. When the first temperature difference reaches the preset temperature difference and the actual heat exchange direction is consistent with the target heat exchange direction, the deep water is controlled to flow through the first heat exchange component so that the first heat exchange component uses the deep water to perform the first heat exchange treatment on the fresh air.

[0150] In one possible implementation, the second control module is specifically used to acquire the temperature of the fresh air output from the first heat exchange component and before entering the second heat exchange component, as the outlet air temperature. Calculate the absolute value of the difference between the outgoing air temperature and the target supply air temperature to obtain the second temperature difference, and compare the second temperature difference with the preset temperature deviation. When the outlet air temperature is higher than the target supply air temperature and the second temperature difference reaches the preset temperature deviation, the chilled water is controlled to flow through the second heat exchange component so that the second heat exchange component performs a second heat exchange treatment to reduce the temperature of the fresh air after the first heat exchange treatment. When the outlet air temperature is lower than the target supply air temperature and the second temperature difference reaches the preset temperature deviation, the hot water is controlled to flow through the second heat exchange component so that the second heat exchange component can perform a second heat exchange treatment to increase the temperature of the fresh air after the first heat exchange treatment; when the second temperature difference does not reach the preset temperature deviation, the second heat exchange component is controlled not to perform the second heat exchange treatment.

[0151] In one possible implementation, the first control module is further configured to control the blower to drive the fresh air to flow sequentially through the first heat exchange component and the second heat exchange component when the power supply status of the fresh air unit is normal power supply status, so as to perform the first heat exchange treatment and the second heat exchange treatment on the fresh air. When the power supply status of the fresh air handling unit changes from normal power supply status to power failure status, the control fan stops running, the regular air duct is closed and the emergency air duct is opened so that fresh air enters the emergency air duct. The deep water supply line, which is connected to the first heat exchange component, is switched to the hydraulic drive branch line, which is connected to the hydraulic drive fan. The head pressure generated by the deep water is used to drive the hydraulic drive fan to deliver fresh air flowing through the emergency air duct into the room.

[0152] In one possible implementation, the second control module is further configured to connect the emergency heat exchange branch to the deep water source when the power supply state switches from the normal power supply state to the power outage state, so as to introduce some deep water into the emergency heat exchange branch. The deep water flowing through the emergency heat exchange branch exchanges heat with the condenser end, so that the heat exchange medium in the split heat pipe absorbs the heat of the fresh air flowing through the emergency air duct at the evaporation end and transfers the heat to the condenser end. A water-powered fan is used to deliver fresh air, which has undergone heat exchange at the evaporator, into the room.

[0153] Figure 6 This is a schematic diagram of the structure of a fresh air handling unit provided in an embodiment of the present invention. Figure 6 The illustrated fresh air handling unit 600 includes at least one processor 601, a memory 602, at least one network interface 604, and other user interfaces 603. The various components in the fresh air handling unit 600 are coupled together via a bus system 605. It is understood that the bus system 605 is used to enable communication between these components. In addition to a data bus, the bus system 605 also includes a power bus, a control bus, and a status signal bus. However, for clarity, in… Figure 6 The general designated all buses as Bus System 605.

[0154] The user interface 603 may include a display, keyboard, or clicking device (e.g., mouse, trackball, touchpad, or touchscreen).

[0155] It is understood that the memory 602 in this embodiment of the invention can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous DRAM (SDRAM), Double Data Rate Synchronous DRAM (DDRSDRAM), Enhanced Synchronous DRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), and Direct Rambus RAM (DRRAM). The memory 602 described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0156] In some implementations, memory 602 stores elements, executable units or data structures, or subsets thereof, or extended sets thereof: operating system 6021 and application program 6022.

[0157] The operating system 6021 includes various system programs, such as the framework layer, core library layer, and driver layer, used to implement various basic business functions and handle hardware-based tasks. The application program 6022 includes various applications, such as a media player and a browser, used to implement various application functions. The program implementing the method of this embodiment can be included in the application program 6022.

[0158] In this embodiment of the invention, by calling the program or instructions stored in memory 602, specifically the program or instructions stored in application program 6022, processor 601 executes the method steps provided in each method embodiment, including, for example: The system obtains the temperature of the fresh air before it enters the first heat exchange component, the temperature of the deep water supplied from the deep water source to the first heat exchange component, and the target supply air temperature corresponding to the air outlet of the fresh air unit. The target heat exchange direction is determined based on the fresh air temperature and the target supply air temperature. When the first temperature difference between the fresh air temperature and the deep water temperature reaches the preset temperature difference, and the actual heat exchange direction between the deep water and the fresh air is consistent with the target heat exchange direction, the first heat exchange component is controlled to use the deep water to perform the first heat exchange treatment on the fresh air. The outlet air temperature after the first heat exchange treatment is obtained, and the second heat exchange component is controlled to perform a second heat exchange treatment on the fresh air based on the second temperature difference between the outlet air temperature and the target supply air temperature.

[0159] The methods disclosed in the above embodiments of the present invention can be applied to processor 601, or implemented by processor 601. Processor 601 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the integrated logic circuit of the hardware in processor 601 or by instructions in the form of software. The processor 601 may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the present invention. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of the present invention can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software units in the decoding processor. The software units may be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory 602. Processor 601 reads the information in memory 602 and, in conjunction with its hardware, completes the steps of the above method.

[0160] It is understood that the embodiments described herein can be implemented in hardware, software, firmware, middleware, microcode, or a combination thereof. For hardware implementation, the processing unit can be implemented in one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), general-purpose processors, controllers, microcontrollers, microprocessors, other electronic units for performing the functions described herein, or combinations thereof.

[0161] For software implementation, the techniques described herein can be implemented by units that perform the functions described herein. The software code can be stored in memory and executed by a processor. The memory can be implemented in the processor or external to the processor.

[0162] The fresh air handling unit provided in this embodiment can be as follows: Figure 6 The fresh air handling unit shown can perform the following functions: Figure 1 All steps of the method, thus achieving Figure 1 For details on the technical effects of the method shown, please refer to [link / reference]. Figure 1-2 The relevant descriptions are presented concisely and will not be elaborated upon here.

[0163] This invention also provides a storage medium (computer-readable storage medium). This storage medium stores one or more programs. The storage medium may include volatile memory, such as random access memory; it may also include non-volatile memory, such as read-only memory, flash memory, hard disk, or solid-state drive; and it may also include combinations of the above types of memory.

[0164] When one or more programs in the storage medium can be executed by one or more processors to achieve the above-described method of execution on the device side.

[0165] The processor is used to execute a program stored in memory to implement the steps of the method performed on the device side: The system obtains the temperature of the fresh air before it enters the first heat exchange component, the temperature of the deep water supplied from the deep water source to the first heat exchange component, and the target supply air temperature corresponding to the air outlet of the fresh air unit. The target heat exchange direction is determined based on the fresh air temperature and the target supply air temperature. When the first temperature difference between the fresh air temperature and the deep water temperature reaches the preset temperature difference, and the actual heat exchange direction between the deep water and the fresh air is consistent with the target heat exchange direction, the first heat exchange component is controlled to use the deep water to perform the first heat exchange treatment on the fresh air. The outlet air temperature after the first heat exchange treatment is obtained, and the second heat exchange component is controlled to perform a second heat exchange treatment on the fresh air based on the second temperature difference between the outlet air temperature and the target supply air temperature.

[0166] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0167] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented in hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0168] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., 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 method for controlling a fresh air handling unit, characterized in that, Applied to a fresh air handling unit including a first heat exchange component and a second heat exchange component, the method includes: The temperature of the fresh air before it enters the first heat exchange component is obtained, as is the temperature of the deep water supplied from the deep water source to the first heat exchange component, and the target supply air temperature corresponding to the air outlet of the fresh air unit is obtained. The target heat exchange direction is determined based on the fresh air temperature and the target supply air temperature. When the first temperature difference between the fresh air temperature and the deep water temperature reaches the preset temperature difference, and the actual heat exchange direction between the deep water and the fresh air is consistent with the target heat exchange direction, the first heat exchange component is controlled to use the deep water to perform the first heat exchange treatment on the fresh air. The outlet air temperature after the first heat exchange treatment is obtained, and the second heat exchange component is controlled to perform a second heat exchange treatment on the fresh air based on the second temperature difference between the outlet air temperature and the target supply air temperature.

2. The method according to claim 1, characterized in that, Determining the target heat exchange direction based on the fresh air temperature and the target supply air temperature includes: When the fresh air temperature is higher than the sum of the target supply air temperature and the preset temperature deviation, the fresh air unit is determined to be in summer operation mode, and the direction of reducing the fresh air temperature is determined as the target heat exchange direction; When the fresh air temperature is lower than the difference between the target supply air temperature and the preset temperature deviation, the fresh air unit is determined to be in winter operation mode, and the direction of increasing the fresh air temperature is determined as the target heat exchange direction; When the fresh air temperature is within the temperature range determined by the target supply air temperature and the preset temperature deviation, the first heat exchange component and the second heat exchange component are controlled to maintain the current operating state or stop heat exchange.

3. The method according to claim 1, characterized in that, When the first temperature difference between the fresh air temperature and the deep water temperature reaches a preset temperature difference, and the actual heat exchange direction between the deep water and the fresh air is consistent with the target heat exchange direction, the first heat exchange component is controlled to perform a first heat exchange treatment on the fresh air using the deep water, including: Calculate the absolute value of the difference between the fresh air temperature and the deep water temperature to obtain the first temperature difference, and compare the first temperature difference with the preset temperature difference; When the fresh air temperature is higher than the deep water temperature, the direction in which heat is transferred from the fresh air to the deep water is determined as the actual heat exchange direction; when the deep water temperature is higher than the fresh air temperature, the direction in which heat is transferred from the deep water to the fresh air is determined as the actual heat exchange direction. When the target heat exchange direction is the direction of reducing the temperature of the fresh air and the actual heat exchange direction is the direction of transferring heat from the fresh air to the deep water, or when the target heat exchange direction is the direction of increasing the temperature of the fresh air and the actual heat exchange direction is the direction of transferring heat from the deep water to the fresh air, the actual heat exchange direction is determined to be consistent with the target heat exchange direction. When the first temperature difference reaches the preset temperature difference and the actual heat exchange direction is consistent with the target heat exchange direction, the deep water is controlled to flow through the first heat exchange component so that the first heat exchange component uses the deep water to perform the first heat exchange treatment on the fresh air.

4. The method according to claim 1, characterized in that, The step of obtaining the outlet air temperature after the first heat exchange treatment and controlling the second heat exchange component to perform a second heat exchange treatment on the fresh air based on the second temperature difference between the outlet air temperature and the target supply air temperature includes: The temperature of the fresh air output from the first heat exchange component and before entering the second heat exchange component is obtained as the outlet air temperature; Calculate the absolute value of the difference between the outlet air temperature and the target supply air temperature to obtain the second temperature difference, and compare the second temperature difference with the preset temperature deviation; When the outlet air temperature is higher than the target supply air temperature and the second temperature difference reaches the preset temperature deviation, the chilled water is controlled to flow through the second heat exchange component so that the second heat exchange component performs a second heat exchange treatment to reduce the temperature of the fresh air after the first heat exchange treatment. When the outlet air temperature is lower than the target supply air temperature and the second temperature difference reaches the preset temperature deviation, hot water is controlled to flow through the second heat exchange component so that the second heat exchange component performs a second heat exchange treatment to increase the temperature of the fresh air after the first heat exchange treatment; when the second temperature difference does not reach the preset temperature deviation, the second heat exchange component is controlled not to perform the second heat exchange treatment.

5. The method according to claim 1, characterized in that, The fresh air handling unit further includes a conventional air duct, an emergency air duct, a blower installed in the conventional air duct, and a hydraulically driven blower installed in the emergency air duct. The first heat exchange component and the second heat exchange component are installed in the conventional air duct along the fresh air flow direction. The method further includes: When the power supply status of the fresh air unit is normal, the blower is controlled to drive the fresh air to flow through the first heat exchange component and the second heat exchange component in sequence, so as to perform the first heat exchange treatment and the second heat exchange treatment on the fresh air. When the power supply status of the fresh air unit switches from the normal power supply status to the power failure status, the blower is controlled to stop running, the conventional air duct is closed and the emergency air duct is opened so that the fresh air enters the emergency air duct. The deep water supply line connected to the first heat exchange component is switched to the hydraulic drive branch line connected to the hydraulic drive fan, and the head pressure formed by the deep water is used to drive the hydraulic drive fan to deliver fresh air flowing through the emergency air duct into the room.

6. The method according to claim 5, characterized in that, The fresh air handling unit further includes a split heat pipe disposed in the emergency air duct, the split heat pipe including an evaporator end located in the emergency air duct and a condenser end connected to the emergency heat exchange branch for heat exchange, and the method further includes: When the power supply state switches from the normal power supply state to the power outage state, the emergency heat exchange branch is connected to the deep water source so as to introduce a portion of the deep water into the emergency heat exchange branch. The deep water flowing through the emergency heat exchange branch exchanges heat with the condenser end, so that the heat exchange medium in the split heat pipe absorbs the heat of the fresh air flowing through the emergency air duct at the evaporation end and transfers the heat to the condenser end. The water-driven fan is used to deliver fresh air, which has undergone heat exchange at the evaporator end, into the room.

7. A fresh air handling unit control system, characterized in that, This includes fresh air handling units, deep water supply, and controllers; The fresh air handling unit includes a conventional air duct, an emergency air duct, a first heat exchange component, a second heat exchange component, a blower, a separate heat pipe, and a hydraulically driven fan. The first heat exchange component, the second heat exchange component, and the blower are arranged sequentially in the conventional air duct along the fresh air flow direction, while the separate heat pipe and the hydraulically driven fan are arranged in the emergency air duct. The water side of the first heat exchange component is connected to the deep water source through a deep water supply pipeline, and is used to perform a first heat exchange treatment on the fresh air using deep water. The medium side of the second heat exchange component is connected to a cold water source or a hot water source, and is used to perform a second heat exchange treatment on the fresh air after the first heat exchange treatment. The condenser end of the split heat pipe is connected to the deep water source for heat exchange via an emergency heat exchange branch, and the hydraulically driven fan is connected to the deep water source via a hydraulically driven branch, for use in emergency heat exchange and hydraulically driven air supply using the deep water in the event of a power outage. The conventional air duct and the emergency air duct are respectively equipped with a first air valve and a second air valve for switching the fresh air flow path, and the deep water supply pipeline, the emergency heat exchange branch and the hydraulic drive branch are respectively equipped with water circuit control valves. The controller is connected to the first heat exchange component, the second heat exchange component, the blower, the first air valve, the second air valve, and the water control valve, respectively, and is used to execute the fresh air unit control method according to any one of claims 1 to 6.

8. A fresh air handling unit control device, characterized in that, include: The acquisition module is used to acquire the fresh air temperature before entering the first heat exchange component of the fresh air unit, the deep water temperature delivered from the deep water source to the first heat exchange component, and the target air supply temperature corresponding to the air outlet of the fresh air unit. The first control module is used to determine the target heat exchange direction based on the fresh air temperature and the target supply air temperature, and when the first temperature difference between the fresh air temperature and the deep water temperature reaches a preset temperature difference, and the actual heat exchange direction between the deep water and the fresh air is consistent with the target heat exchange direction, control the first heat exchange component to perform a first heat exchange treatment on the fresh air using the deep water. The second control module is used to obtain the outlet air temperature after the first heat exchange treatment, and control the second heat exchange component of the fresh air unit to perform a second heat exchange treatment on the fresh air according to the second temperature difference between the outlet air temperature and the target supply air temperature.

9. A fresh air handling unit, characterized in that, include: A processor and a memory, the processor being configured to execute a fresh air handling unit control program stored in the memory to implement the fresh air handling unit control method according to any one of claims 1 to 6.

10. A storage medium, characterized in that, The storage medium stores one or more programs, which can be executed by one or more processors to implement the fresh air unit control method according to any one of claims 1 to 6.

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