A control method and system for energy recovery of a fresh air handling unit, a terminal and a medium

Abstract

The application discloses a fresh air handling unit energy recovery control method and system, a terminal and a medium, and relates to the technical field of fresh air handling unit energy recovery. The main technical scheme is as follows: by dynamically optimizing the fan speed ratio, the unit can always maintain an optimal energy recovery state under various variable working conditions. The purpose of effectively solving the problem of low efficiency of the traditional control scheme under non-design working conditions is achieved. The energy recovery efficiency coefficient is used as the optimization target, and the recovered energy and the power consumed by the fan are normalized and compared. The purpose of reducing the risk of increasing the net energy-saving effect after increasing the power consumption of the fan is achieved. The constraint condition is set in the speed ratio adjustment process. The purpose of ensuring that the fan speed adjustment does not excessively sacrifice the indoor ventilation demand, thereby effectively reducing the risk of indoor air quality deterioration caused by pursuing high recovery efficiency, and achieving energy saving and ensuring indoor air quality is achieved.

Description

Technical Field

[0001] This invention relates to the field of energy recovery technology for fresh air handling units, specifically to a control method, system, terminal, and medium for energy recovery in fresh air handling units. Background Technology

[0002] A fresh air system is an effective air purification device that circulates indoor air. On the one hand, it expels polluted indoor air to the outside, and on the other hand, it introduces fresh outdoor air into the room after sterilization, disinfection, temperature and humidity regulation, and filtration, ensuring that the room is always filled with fresh and clean air.

[0003] The prior art discloses a digital fresh air disinfection unit that can recover indoor heat energy and prevent cross-contamination, including a shell. A partition extending along the length of the shell is disposed inside the shell, dividing the shell into an air inlet chamber and an air outlet chamber. One end of the air inlet chamber has an external air inlet, and the other end has an internal air outlet. One end of the air outlet chamber has an internal air inlet, and the other end has an external air outlet. The external air inlet and the external air outlet are opposite each other, and the internal air outlet and the internal air inlet are opposite each other. An air intake fan is disposed inside the air inlet chamber to deliver air from the external air inlet to the internal air outlet, and an exhaust fan is disposed inside the air outlet chamber to deliver air from the internal air inlet to the external air outlet.

[0004] However, the control logic of this unit does not involve dynamic optimization of "energy recovery efficiency". Under non-design conditions (such as partial load operation or large fluctuations in indoor and outdoor temperature difference), there is a problem of low recovery efficiency, which fails to fully utilize waste heat or excessively consumes fan energy in pursuit of recovery effect, resulting in overall energy efficiency being not worthwhile. Summary of the Invention

[0005] The purpose of this invention is to provide a control method, system, terminal and medium for energy recovery of fresh air handling units, which solves the problem that existing units have low recovery efficiency under non-design conditions, cannot make full use of waste heat or consume excessive fan energy in pursuit of recovery effect, resulting in overall energy efficiency losses.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] Firstly, a control method for energy recovery in a fresh air handling unit is provided, including the following operations:

[0008] S1, real-time acquisition of the operating parameters of the fresh air unit, the operating parameters including at least the real-time power of the intake fan, the real-time power of the exhaust fan, the air volume on the intake side, the air volume on the exhaust side, the indoor exhaust temperature, and the outdoor exhaust temperature;

[0009] S2, Based on the operating parameters, obtain the energy recovery efficiency coefficient under the current operating condition;

[0010] S3, with the goal of maximizing the energy recovery efficiency coefficient, dynamically adjust the speed ratio of the intake fan and the exhaust fan, and maintain the total ventilation volume within a preset range during the adjustment process;

[0011] S4 controls the operation of the intake and exhaust fans according to the adjusted speed ratio, and then returns to S1.

[0012] A further solution is: the process of dynamically adjusting the speed ratio of the intake fan and the exhaust fan includes:

[0013] S31, when the total ventilation volume is within the preset range, the speed ratio is increased by a preset step size;

[0014] S32, calculate the energy recovery efficiency coefficient after increasing the speed ratio, and determine whether the energy recovery efficiency coefficient after increasing the speed ratio is greater than the energy recovery efficiency coefficient before increasing the speed ratio. If so, continue to increase the speed ratio by a preset step size until the energy recovery efficiency coefficient after increasing the speed ratio is less than or equal to the energy recovery efficiency coefficient before increasing the speed ratio, and determine the speed ratio before increasing the speed ratio as the optimal speed ratio under the current working condition; otherwise, execute S33.

[0015] S33, reduce the speed ratio by a preset step size, and calculate the energy recovery efficiency coefficient after reducing the speed ratio;

[0016] S34. Determine whether the energy recovery efficiency coefficient after reducing the speed ratio is greater than the energy recovery efficiency coefficient before reducing the speed ratio. If so, continue to reduce the speed ratio by a preset step size until the energy recovery efficiency coefficient after reducing the speed ratio is less than or equal to the energy recovery efficiency coefficient before reducing the speed ratio, and determine the speed ratio before reduction as the optimal speed ratio under the current operating conditions.

[0017] A further solution is to increase or decrease the speed ratio by a preset step size, so that the gas pressure in the section where the heat exchanger is located in the air inlet channel is greater than the gas pressure in the section where the heat exchanger is located in the air outlet channel.

[0018] A further proposed solution is that the process of obtaining the energy recovery efficiency coefficient under the current operating conditions includes:

[0019] The recovered heat power is obtained by calculating and processing the air volume on the intake side, the air volume on the exhaust side, the indoor exhaust temperature, and the outdoor exhaust temperature.

[0020] The real-time power of the intake fan and the real-time power of the exhaust fan are calculated to obtain the total power of the fans.

[0021] The energy recovery efficiency coefficient is obtained by calculating and processing the recovered heat power and the total power of the fan.

[0022] A further proposed solution is: before S4, thermal inertia feedforward compensation is also included, the process of which includes:

[0023] Real-time monitoring of the rate of change in indoor exhaust air temperature;

[0024] And when the absolute value of the rate of change exceeds the preset threshold, based on the heat storage dynamic model of the heat exchanger, the lag effect of the change in indoor exhaust temperature on the unit supply air temperature is predicted.

[0025] Based on the forecast results, the output power of the auxiliary heating or cooling devices installed in the air intake channel is adjusted in advance to suppress fluctuations in the supply air temperature.

[0026] A further proposed solution is: the thermal storage dynamic model is as follows:

[0027]

[0028] in, For supply air temperature; Indoor exhaust air temperature; Outdoor ambient temperature; This refers to the air volume on the intake side. This refers to the exhaust side air volume; The time delay constant of the heat exchanger; The current moment; , , It is a constant.

[0029] In a second aspect, a control system for energy recovery of a fresh air handling unit is provided, the control system being applicable to the control method described in the first aspect, the control system comprising:

[0030] The first acquisition module is used to execute S1 to acquire the operating parameters of the fresh air unit in real time. The operating parameters include at least the real-time power of the intake fan, the real-time power of the exhaust fan, the air volume on the intake side, the air volume on the exhaust side, the indoor exhaust temperature, and the outdoor exhaust temperature.

[0031] The second acquisition module is used to execute S2 to acquire the energy recovery efficiency coefficient under the current operating condition based on the operating parameters.

[0032] The adjustment module is used to execute S3, which aims to maximize the energy recovery efficiency coefficient, dynamically adjusts the speed ratio of the intake fan and the exhaust fan, and maintains the total ventilation volume within a preset range during the adjustment process;

[0033] The operation module is used to execute S4 to control the operation of the intake fan and exhaust fan according to the adjusted speed ratio, and then return to S1.

[0034] Thirdly, a terminal is provided, including a processor and a memory, the memory being used to store processor-executable instructions; wherein the processor is configured to invoke the instructions stored in the memory to perform the control method as described in the first aspect.

[0035] Fourthly, a computer-readable storage medium is provided, on which computer program instructions are stored, which, when executed by a processor, implement the control method described in the first aspect.

[0036] Compared with the prior art, the beneficial effects of the present invention are:

[0037] By monitoring operating parameters in real time and dynamically optimizing the fan speed ratio, the unit can maintain a near-optimal energy recovery state under various variable operating conditions. This aims to effectively solve the problem of low efficiency in traditional control schemes under off-design conditions. The "energy recovery efficiency coefficient" is used as the optimization target, and the recovered energy is compared with the electrical energy consumed by the fan in a normalized manner. This aims to reduce the risk that increasing fan power and energy consumption might increase energy consumption but decrease net energy saving. A constraint condition of "total ventilation volume within a preset range" is set during the speed ratio adjustment process. This aims to ensure that fan speed adjustment does not excessively sacrifice indoor ventilation needs, thereby effectively reducing the risk of indoor air quality deterioration in pursuit of high recovery efficiency, thus simultaneously achieving energy saving and ensuring indoor air quality. Attached Figure Description

[0038] Figure 1 This is a flowchart illustrating a control method for energy recovery of a fresh air handling unit in this embodiment. Detailed Implementation

[0039] The invention will now be further described with reference to the accompanying drawings.

[0040] Example 1: This example provides a control method for energy recovery in a fresh air handling unit, such as... Figure 1 As shown, the following operations are included:

[0041] S100. Real-time acquisition of the operating parameters of the fresh air unit, the operating parameters including at least the real-time power of the intake fan, the real-time power of the exhaust fan, the air volume on the intake side, the air volume on the exhaust side, the indoor exhaust temperature, and the outdoor exhaust temperature;

[0042] For example, during implementation, the real-time power of the fresh air handling unit's intake fan is obtained through sensors installed at corresponding locations within the fresh air handling unit. Real-time power of exhaust fan Air volume on the intake side Exhaust side air volume Indoor exhaust temperature and outdoor exhaust temperature Operating parameters, including the real-time power of the intake fan. The real-time power consumption of the intake fan and the real-time power consumption of the exhaust fan are shown. The real-time power consumption of the exhaust fan, and the air volume on the intake side. The air volume at the inner air inlet of the blower, and the air volume on the exhaust side. The air volume at the exhaust fan's outlet and the indoor exhaust temperature. The temperature at the air inlet of the exhaust chamber, and the outdoor exhaust temperature. This refers to the temperature at the outlet of the exhaust chamber.

[0043] For example, by using two power sensors to obtain the real-time power consumption of the intake fan motor and the exhaust fan, respectively, the real-time power of the intake fan can be obtained. Real-time power of exhaust fan Air volume sensors are installed at both the internal air inlet and the external air outlet. These two sensors are used to obtain the air volume at the internal air inlet and the external air outlet, respectively, to determine the air volume on the intake side. and exhaust side air volume Temperature sensors are installed at both the internal air inlet and the external air outlet. The temperatures at the internal air inlet and the external air outlet are obtained from these two sensors to determine the indoor exhaust air temperature. and outdoor exhaust temperature .

[0044] S200. Obtain the energy recovery efficiency coefficient under the current operating conditions based on the operating parameters;

[0045] In this embodiment, the process of obtaining the energy recovery efficiency coefficient under the current operating condition includes:

[0046] The recovered heat power is obtained by calculating and processing the air volume on the intake side, the air volume on the exhaust side, the indoor exhaust temperature, and the outdoor exhaust temperature.

[0047] The formula for calculating the recovered heat power is:

[0048]

[0049] in, For the recovered heat power; The specific heat capacity of air; air density; This refers to the air volume on the intake side. This refers to the exhaust side air volume; Indoor exhaust air temperature; This refers to the outdoor exhaust temperature.

[0050] Among them, the specific heat capacity of air Generally, 1005 J / (kg·K) is used; air density The general value is 1.2 kg / m³.

[0051] In this embodiment, considering that the actual heat exchange capacity is limited by the smaller air volume side, the smaller air volume between the inlet air volume and the exhaust air volume is selected when calculating the recovered heat power.

[0052] The real-time power of the intake fan and the real-time power of the exhaust fan are calculated to obtain the total power of the fans.

[0053] The formula for calculating the total power of the fan is:

[0054]

[0055] in, This refers to the total power of the fan. This refers to the real-time power of the intake fan. This represents the real-time power of the exhaust fan.

[0056] The energy recovery efficiency coefficient is obtained by calculating and processing the recovered heat power and the total power of the fan.

[0057] The energy recovery efficiency coefficient is calculated as follows:

[0058]

[0059] in, The energy recovery efficiency coefficient; For the recovered heat power; This represents the total power of the fan.

[0060] S300. With maximizing the energy recovery efficiency coefficient as the optimization objective, dynamically adjust the speed ratio of the intake fan and the exhaust fan, and maintain the total ventilation volume within a preset range during the adjustment process;

[0061] For example, in implementation, exhaust energy recovery involves heat exchange between incoming indoor air and outgoing indoor air. According to heat recovery theory, the actual energy recovery efficiency changes when the exhaust volume and fresh air volume are unequal. For instance, when the incoming indoor air volume is less than the outgoing indoor air volume, the outgoing air carries relatively more energy, while the incoming air requires relatively less energy, resulting in increased energy recovery efficiency. Conversely, when the fresh air volume is greater than the exhaust volume, the outgoing indoor air carries relatively less energy, while the incoming air requires relatively more energy, resulting in decreased energy recovery efficiency. Therefore, adjusting the speed ratio of the intake fan to the exhaust fan can regulate the ratio between fresh air volume and exhaust air volume, thereby affecting energy recovery efficiency.

[0062] Using the energy recovery efficiency coefficient calculated in step S200 as the optimization objective function, an optimization algorithm (such as gradient descent, adaptive control algorithm, or table lookup method based on historical data) is used to search for the wind turbine speed ratio that maximizes the energy recovery efficiency coefficient under the current operating conditions.

[0063] During implementation, to reduce the risk of indoor air quality deterioration caused by excessively reducing fan speed in pursuit of high recovery efficiency, upper and lower limits are set for the total air exchange volume to ensure that the actual air exchange volume of the room remains within the preset range during any optimization adjustment. The preset range for the total air exchange volume is typically determined based on room volume, occupancy density, and relevant ventilation standards.

[0064] S400. Control the intake fan and exhaust fan to run according to the adjusted speed ratio, and return to S100.

[0065] For example, during implementation, the optimized speed ratio is sent to the variable frequency drive units of the intake and exhaust fans to adjust their operating speeds in real time. After adjustment, the control flow returns to step S100 to re-collect the operating parameters under the latest conditions and repeat the cycle. This achieves dynamic and continuous optimization of the energy recovery efficiency of the fresh air handling unit.

[0066] The energy recovery control method for the fresh air handling unit in this embodiment, on the one hand, enables the unit to maintain a near-optimal energy recovery state under various variable operating conditions by real-time monitoring of operating parameters and dynamic optimization of the fan speed ratio. This aims to effectively solve the problem of low efficiency in traditional control schemes under off-design conditions. On the other hand, it uses the "energy recovery efficiency coefficient" as the optimization target, comparing the recovered energy with the electrical energy consumed by the fan in a normalized manner. This aims to reduce the risk that increasing the recovered heat but decreasing the net energy saving effect after increasing the fan power and energy consumption. Furthermore, a constraint condition of "total air exchange volume within a preset range" is set during the speed ratio adjustment process. This aims to ensure that the fan speed adjustment does not excessively sacrifice indoor ventilation needs, thereby effectively reducing the risk of indoor air quality deterioration due to pursuing high recovery efficiency, thus simultaneously achieving energy saving and ensuring indoor air quality.

[0067] In this embodiment, the process of dynamically adjusting the speed ratio of the intake fan and the exhaust fan includes:

[0068] S301, when the total air exchange volume is within the preset range, the speed ratio is increased by a preset step size;

[0069] For example, during implementation, the total ventilation volume is set to... ,in, And total ventilation Located within the preset range [ , ]Inside.

[0070] Set the speed of the intake fan The exhaust fan speed is The speed ratio of the intake fan to the exhaust fan is .in, .

[0071] speed ratio Increase by a preset step size (Specific values ​​are set according to the system response characteristics, such as 0.05 or 0.1). For example, the speed of the intake fan can be kept constant while the speed of the exhaust fan can be reduced, or the speeds of the intake and exhaust fans can be adjusted simultaneously to maintain the total air exchange volume. Located within the preset range [ , ]Inside.

[0072] S302, calculate the energy recovery efficiency coefficient after increasing the speed ratio, and determine whether the energy recovery efficiency coefficient after increasing the speed ratio is greater than the energy recovery efficiency coefficient before increasing the speed ratio. If so, continue to increase the speed ratio by a preset step size until the energy recovery efficiency coefficient after increasing the speed ratio is less than or equal to the energy recovery efficiency coefficient before increasing the speed ratio, and determine the speed ratio before increasing the speed ratio as the optimal speed ratio under the current operating condition; otherwise, execute S303.

[0073] For example, during implementation, when the speed ratio is... Increase by a preset step size When calculating the increase in speed ratio The energy recovery efficiency coefficient after the initial increase in speed ratio is determined, and the first increase in speed ratio is used to determine the energy recovery efficiency coefficient. Is the energy recovery efficiency coefficient after increasing the speed ratio greater than that after increasing the speed ratio? The energy recovery efficiency coefficient before the speed ratio is increased. The energy recovery efficiency coefficient after increasing the speed ratio is greater than that after increasing the speed ratio. The previous energy recovery efficiency coefficient indicates that if the energy recovery efficiency coefficient increases, the speed ratio will continue to be increased. Increase by a preset step size This continues until the energy recovery efficiency coefficient after increasing the speed ratio is less than or equal to the energy recovery efficiency coefficient before increasing the speed ratio. At this point, the speed ratio after this increase is recorded as the optimal speed ratio under the current operating conditions. If the speed ratio is increased for the first time The energy recovery efficiency coefficient after increasing the speed ratio is less than or equal to that after increasing the speed ratio. If the energy recovery efficiency coefficient is not met, then execute S303.

[0074] S303, reduce the speed ratio by a preset step size, and calculate the energy recovery efficiency coefficient after reducing the speed ratio;

[0075] For example, during implementation, if the speed ratio is increased for the first time... The energy recovery efficiency coefficient after increasing the speed ratio is less than or equal to that after increasing the speed ratio. The energy recovery efficiency coefficient before the speed ratio increases indicates that the energy recovery efficiency coefficient increases with the speed ratio. In this direction, the energy recovery efficiency coefficient will not increase. Therefore, the rotational speed ratio will be... Decrease by a preset step size And calculate the energy recovery efficiency coefficient after reducing the speed ratio.

[0076] S304. Determine whether the energy recovery efficiency coefficient after reducing the speed ratio is greater than the energy recovery efficiency coefficient before reducing the speed ratio. If so, continue to reduce the speed ratio by a preset step size until the energy recovery efficiency coefficient after reducing the speed ratio is less than or equal to the energy recovery efficiency coefficient before reducing the speed ratio, and determine the speed ratio before reduction as the optimal speed ratio under the current operating conditions.

[0077] For example, during implementation, the first reduction in speed ratio is determined. Is the energy recovery efficiency coefficient after reducing the speed ratio greater than that after reducing the speed ratio? The energy recovery efficiency coefficient before the speed ratio is reduced. The energy recovery efficiency coefficient after reducing the speed ratio is greater than that after reducing the speed ratio. The previous energy recovery efficiency coefficient indicates that if the energy recovery efficiency coefficient increases, the speed ratio will continue to be increased. Decrease by a preset step size This continues until the energy recovery efficiency coefficient after reducing the speed ratio is less than or equal to the energy recovery efficiency coefficient before reducing the speed ratio. At this point, the speed ratio for this reduction is... This is denoted as the optimal speed ratio under the current operating conditions. If the speed ratio is decreased for the first time... The energy recovery efficiency coefficient after reducing the speed ratio is less than or equal to that after reducing the speed ratio. If the energy recovery efficiency coefficient is calculated beforehand, then the speed ratio that is reduced in this operation is recorded as the optimal speed ratio under the current operating conditions.

[0078] In this embodiment, during the process of increasing or decreasing the speed ratio by a preset step size, the gas pressure in the section where the heat exchanger is located in the air inlet channel is made greater than the gas pressure in the section where the heat exchanger is located in the air outlet channel.

[0079] For example, during implementation, it is considered that in traditional energy recovery fresh air units, even with sealing measures on both sides of the heat exchanger, small gaps or leaks may still appear after long-term operation due to vibration, aging, dust accumulation, etc. If the pressure on the exhaust side is higher than that on the fresh air side, the air exhausted from the room (which may contain CO2, formaldehyde, bacteria, viruses, fumes, moisture, etc.) will directly seep into the fresh air side and be reintroduced into the room, causing cross-contamination and rendering the fresh air unit ineffective.

[0080] This embodiment actively controls the pressure on the intake side to always be higher than that on the exhaust side, ensuring that any leakage flows from the fresh air side to the exhaust side. This aims to reduce the risk of backflow even in the presence of minute gaps, thereby ensuring the functionality of the fresh air system.

[0081] In this embodiment, before S400, thermal inertia feedforward compensation is also included. The process of thermal inertia feedforward compensation includes:

[0082] Real-time monitoring of the rate of change in indoor exhaust air temperature;

[0083] And when the absolute value of the rate of change exceeds the preset threshold, based on the heat storage dynamic model of the heat exchanger, the lag effect of the change in indoor exhaust temperature on the unit supply air temperature is predicted.

[0084] Based on the forecast results, the output power of the auxiliary heating or cooling devices installed in the air intake channel is adjusted in advance to suppress fluctuations in the supply air temperature.

[0085] For example, during implementation, considering that without feedforward compensation, when the indoor exhaust temperature suddenly rises or falls due to factors such as people entering and exiting, equipment starting and stopping, and changes in solar radiation, the thermal inertia of the heat exchanger will cause the supply air temperature to slowly follow up after tens of seconds or even minutes, resulting in noticeable fluctuations in the air temperature for indoor users.

[0086] This embodiment predicts and acts in advance, enabling the auxiliary device to make reverse adjustments before temperature fluctuations are transmitted to the air supply, in order to effectively counteract the disturbances and thus ensure a constant air supply temperature.

[0087] In this embodiment, the thermal storage dynamic model is:

[0088]

[0089] in, For supply air temperature; Indoor exhaust air temperature; Outdoor ambient temperature; This refers to the air volume on the intake side. This refers to the exhaust side air volume; The time delay constant of the heat exchanger; The current moment; , , It is a constant.

[0090] Among them, supply air temperature This refers to the temperature at the inner air outlet of the air inlet chamber.

[0091] Example 2: This example provides a control system for energy recovery of a fresh air handling unit. The control system is applicable to the control method described in Example 1. The control system includes a first acquisition module, a second acquisition module, an adjustment module, and an operation module.

[0092] The first acquisition module is used to execute S100 to acquire the operating parameters of the fresh air unit in real time. The operating parameters include at least the real-time power of the intake fan, the real-time power of the exhaust fan, the intake side air volume, the exhaust side air volume, the indoor exhaust air temperature, and the outdoor exhaust air temperature. The second acquisition module is used to execute S200 to acquire the energy recovery efficiency coefficient under the current operating conditions based on the operating parameters. The adjustment module is used to execute S300 to dynamically adjust the speed ratio of the intake fan and the exhaust fan with the optimization goal of maximizing the energy recovery efficiency coefficient, and to maintain the total air exchange volume within a preset range during the adjustment process. The operation module is used to execute S400 to control the operation of the intake fan and the exhaust fan according to the adjusted speed ratio, and then return to S100.

[0093] The energy recovery control system of the fresh air handling unit in this embodiment, on the one hand, monitors operating parameters in real time and dynamically optimizes the fan speed ratio, enabling the unit to maintain a near-optimal energy recovery state under various variable operating conditions. This aims to effectively solve the problem of low efficiency in traditional control schemes under off-design conditions. On the other hand, it uses the "energy recovery efficiency coefficient" as the optimization target, comparing the recovered energy with the electrical energy consumed by the fan in a normalized manner. This aims to reduce the risk that increasing fan power and energy consumption might increase energy consumption but decrease net energy saving. Furthermore, a constraint condition of "total air exchange volume within a preset range" is set during the speed ratio adjustment process. This aims to ensure that fan speed adjustment does not excessively sacrifice indoor ventilation needs, thereby effectively reducing the risk of indoor air quality deterioration due to pursuing high recovery efficiency, thus simultaneously achieving energy saving and ensuring indoor air quality.

[0094] In this embodiment, a terminal is also provided, including a processor and a memory, wherein the memory is used to store processor-executable instructions; wherein the processor is configured to invoke the instructions stored in the memory to execute the control method as described in Embodiment 1.

[0095] In this embodiment, a computer-readable storage medium is also provided, on which computer program instructions are stored, which, when executed by a processor, implement the control method as described in Embodiment 1.

[0096] Although the invention has been described herein with reference to several illustrative embodiments, it should be understood that many other modifications and implementations can be devised by those skilled in the art, which will fall within the scope and spirit of the principles disclosed herein. More specifically, various variations and modifications can be made to the components and / or layout of the subject matter arrangement within the scope of the disclosure, drawings, and claims. Besides variations and modifications to the components and / or layout, other uses will be apparent to those skilled in the art.

Claims

1. A control method for energy recovery in a fresh air handling unit, characterized in that, Includes the following operations: S1, real-time acquisition of the operating parameters of the fresh air unit, the operating parameters including at least the real-time power of the intake fan, the real-time power of the exhaust fan, the air volume on the intake side, the air volume on the exhaust side, the indoor exhaust temperature, and the outdoor exhaust temperature; S2, Based on the operating parameters, obtain the energy recovery efficiency coefficient under the current operating condition; S3, with the goal of maximizing the energy recovery efficiency coefficient, dynamically adjust the speed ratio of the intake fan and the exhaust fan, and maintain the total ventilation volume within a preset range during the adjustment process; S4, control the intake fan and exhaust fan to run according to the adjusted speed ratio, and return to S1; Before S4, thermal inertia feedforward compensation is also included. The process of thermal inertia feedforward compensation includes: Real-time monitoring of the rate of change in indoor exhaust air temperature; And when the absolute value of the rate of change exceeds the preset threshold, based on the heat storage dynamic model of the heat exchanger, the lag effect of the change in indoor exhaust temperature on the unit supply air temperature is predicted. Based on the forecast results, the output power of the auxiliary heating or cooling devices installed in the air intake channel is adjusted in advance to suppress fluctuations in the supply air temperature. The thermal storage dynamic model is as follows: ； in, This refers to the supply air temperature. Indoor exhaust air temperature; Outdoor ambient temperature; This refers to the air volume on the intake side. This refers to the exhaust side air volume; The time delay constant of the heat exchanger; The current moment; , , It is a constant.

2. The control method according to claim 1, characterized in that, The process of dynamically adjusting the speed ratio of the intake fan and the exhaust fan includes: S31, when the total ventilation volume is within the preset range, the speed ratio is increased by a preset step size; S32, calculate the energy recovery efficiency coefficient after increasing the speed ratio, and determine whether the energy recovery efficiency coefficient after increasing the speed ratio is greater than the energy recovery efficiency coefficient before increasing the speed ratio. If so, continue to increase the speed ratio by a preset step size until the energy recovery efficiency coefficient after increasing the speed ratio is less than or equal to the energy recovery efficiency coefficient before increasing the speed ratio, and determine the speed ratio before increasing the speed ratio as the optimal speed ratio under the current working condition; otherwise, execute S33. S33, reduce the speed ratio by a preset step size, and calculate the energy recovery efficiency coefficient after reducing the speed ratio; S34. Determine whether the energy recovery efficiency coefficient after reducing the speed ratio is greater than the energy recovery efficiency coefficient before reducing the speed ratio. If so, continue to reduce the speed ratio by a preset step size until the energy recovery efficiency coefficient after reducing the speed ratio is less than or equal to the energy recovery efficiency coefficient before reducing the speed ratio, and determine the speed ratio before reduction as the optimal speed ratio under the current operating conditions.

3. The control method according to claim 2, characterized in that: During the process of increasing or decreasing the speed ratio by a preset step size, the gas pressure in the section where the heat exchanger is located in the air inlet channel is made greater than the gas pressure in the section where the heat exchanger is located in the air outlet channel.

4. The control method according to claim 1, characterized in that, The process of obtaining the energy recovery efficiency coefficient under the current operating conditions includes: The recovered heat power is obtained by calculating and processing the air volume on the intake side, the air volume on the exhaust side, the indoor exhaust temperature, and the outdoor exhaust temperature. The real-time power of the intake fan and the real-time power of the exhaust fan are calculated to obtain the total power of the fans. The energy recovery efficiency coefficient is obtained by calculating and processing the recovered heat power and the total power of the fan.

5. A control system for energy recovery in a fresh air handling unit, characterized in that, The control system is applicable to the control method as described in any one of claims 1-4, and the control system includes: The first acquisition module is used to execute S1 to acquire the operating parameters of the fresh air unit in real time. The operating parameters include at least the real-time power of the intake fan, the real-time power of the exhaust fan, the air volume on the intake side, the air volume on the exhaust side, the indoor exhaust temperature, and the outdoor exhaust temperature. The second acquisition module is used to execute S2 to acquire the energy recovery efficiency coefficient under the current operating condition based on the operating parameters. The adjustment module is used to execute S3, which aims to maximize the energy recovery efficiency coefficient, dynamically adjusts the speed ratio of the intake fan and the exhaust fan, and maintains the total ventilation volume within a preset range during the adjustment process; The operation module is used to execute S4 to control the operation of the intake fan and exhaust fan according to the adjusted speed ratio, and then return to S1.

6. A terminal, characterized in that, include: A processor and a memory, wherein the memory is used to store processor-executable instructions; The processor is configured to invoke instructions stored in the memory to execute the control method as described in any one of claims 1-4.

7. A computer-readable storage medium having computer program instructions stored thereon, characterized in that, When the computer program instructions are executed by the processor, they implement the control method as described in any one of claims 1-4.

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