CN112539530B - Fresh air exchanger control method and device and fresh air exchanger - Google Patents

Fresh air exchanger control method and device and fresh air exchanger Download PDF

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CN112539530B
CN112539530B CN202011417008.XA CN202011417008A CN112539530B CN 112539530 B CN112539530 B CN 112539530B CN 202011417008 A CN202011417008 A CN 202011417008A CN 112539530 B CN112539530 B CN 112539530B
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fresh air
air
motor
exhaust
energy
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CN112539530A (en
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李逸进
李清泉
吴兰勇
解博超
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Guangdong Nedfon Air System Co Ltd
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Guangdong Nedfon Air System Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/30—Velocity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/50—Load
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/60—Energy consumption
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Signal Processing (AREA)
  • Human Computer Interaction (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses a fresh air exchanger control method, a fresh air exchanger control device and a fresh air exchanger, wherein the power consumption increment of a motor is obtained by acquiring the rotating speed and the current of the motor, acquiring the corresponding volume flow, the fan efficiency and the energy recovery resistance from a preset first coefficient table, and dividing the product of the volume flow and the energy recovery resistance by the fan efficiency; the method comprises the steps of obtaining inlet temperature, inlet relative humidity, outlet temperature and outlet relative humidity of a fresh air exchanger, obtaining corresponding inlet enthalpy, outlet enthalpy, inlet density and outlet density from a preset second coefficient table, calculating an average value of the inlet density and the outlet density to serve as an average density, multiplying an absolute value of a difference value of the inlet enthalpy and the outlet enthalpy by the average density and fresh air volume flow to obtain an energy recovery value, and controlling the heat exchanger to recover energy when a ratio of the energy recovery value to power consumption increment is larger than a first set value to reduce energy loss of the fresh air exchanger.

Description

Fresh air exchanger control method and device and fresh air exchanger
Technical Field
The invention relates to the field of fresh air exchangers, in particular to a control method and device of a fresh air exchanger and the fresh air exchanger.
Background
The fresh air exchanger is a bidirectional flow type ventilation and air exchange device with an energy (cold or heat) recovery function, can suck outdoor fresh air and discharge indoor dirty air outdoors, and can recover energy in exhaust air to fresh air during replacement type ventilation and air exchange, so that the load of air conditioning equipment is reduced, and the energy consumption of air temperature and humidity treatment is reduced. The part for realizing the energy recovery function is a heat exchanger, but pressure loss exists when air passes through the heat exchanger, and when the power part of the fan overcomes the resistance of the power part of the fan and reaches the corresponding air volume, the power consumption of the motor is easily increased, and the energy consumption of the fresh air exchanger is increased.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a fresh air exchanger control method and device and a fresh air exchanger for reducing energy consumption of the fresh air exchanger.
In a first aspect, an embodiment of the present application provides a control method for a fresh air exchanger, where the fresh air exchanger includes a motor and a heat exchanger, and the heat exchanger is used to recover exhaust energy;
the control method of the fresh air exchanger comprises the following steps:
acquiring the rotating speed and current of the motor; the rotating speed and current of the motor comprise a fresh air motor rotating speed, a fresh air motor current, an exhaust motor rotating speed and an exhaust motor current;
acquiring fresh air volume flow, fresh air fan efficiency and fresh air energy recovery resistance corresponding to the rotation speed of the fresh air motor and the current of the fresh air motor from a preset first coefficient table;
acquiring the volume flow of exhaust air, the efficiency of an exhaust fan and the recovery resistance of exhaust air energy corresponding to the rotating speed of the exhaust motor and the current of the exhaust motor from a preset first coefficient table; the energy recovery resistance refers to the difference between the pressure difference of the fresh air exchanger before and after the heat exchanger in the energy recovery mode and the pressure difference of the fresh air exchanger before and after the heat exchanger not in the energy recovery mode under the same air volume;
calculating the power consumption increment of the fresh air motor according to the following modes:
Figure GDA0003398839490000011
wherein, DeltaNxFor incremental power consumption of the fresh air motor, QxIs the volume flow of fresh air, Δ PxFor recovery of fresh air energyxThe efficiency of the fresh air fan;
calculating the power consumption increment of the air exhaust motor according to the following modes:
Figure GDA0003398839490000021
wherein, Δ NpFor incremental power consumption of the air-exhausting motor, QpFor volume flow of exhaust, Δ PpFor recovery of the energy of the exhaust air, etapThe efficiency of the exhaust fan;
adding the power consumption increment of the fresh air motor and the power consumption increment of the air exhaust motor to obtain the power consumption increment of the motor;
acquiring the inlet temperature, inlet relative humidity, outlet temperature and outlet relative humidity of a fresh air exchanger;
acquiring an inlet enthalpy value, an outlet enthalpy value, an inlet density and an outlet density corresponding to the inlet temperature, the inlet relative humidity, the outlet temperature and the outlet relative humidity of the fresh air exchanger from a preset second coefficient table;
obtaining the average value of the inlet density and the outlet density to obtain the average density;
multiplying the absolute value of the difference value between the inlet enthalpy value and the outlet enthalpy value by the average density and the fresh air volume flow to obtain an energy recovery value of the heat exchanger;
and when the ratio of the energy recovery value to the power consumption increment is larger than a first set value, controlling the heat exchanger to recover energy.
Optionally, the motor comprises a fresh air motor and an exhaust motor;
the bypass air valve comprises a fresh air bypass air valve and an exhaust air bypass air valve, the fresh air bypass air valve is arranged between a fresh air channel of the fresh air motor and an air inlet channel of the heat exchanger, and the exhaust air bypass air valve is arranged between an exhaust air channel of the exhaust air motor and an air inlet channel of the heat exchanger.
Optionally, before the step of controlling the heat exchanger to perform energy recovery, the method further includes:
acquiring an energy comparison coefficient according to the following modes:
Figure GDA0003398839490000022
wherein E isβEnergy ratio coefficient, Δ H is energy recovery value, Δ NpFor incremental power consumption of the exhaust motor, Δ NxThe power consumption increment of the fresh air motor is obtained;
and if the energy comparison coefficient is larger than a first set value, closing the bypass air valve.
Optionally, before the step of closing the bypass damper, the method further includes:
detecting whether a bypass air valve is in an opening state or not;
if the bypass air valve is in an opening state, closing the bypass air valve; otherwise, keeping the current mode to continue running.
Optionally, after the step of obtaining the energy comparison coefficient, the method further includes:
and if the energy comparison coefficient is less than or equal to a first set value, opening the bypass air valve.
Optionally, the fresh air exchanger includes a bypass air valve, and the bypass air valve is arranged on an air inlet channel of the heat exchanger and used for changing a circulation path of air; when the bypass air valve is closed, air enters the heat exchanger;
the step of controlling the heat exchanger to perform energy recovery comprises the following steps:
and controlling the bypass air valve to be closed.
In a second aspect, an embodiment of the present application provides a control device for a fresh air exchanger, where the fresh air exchanger includes a motor and a heat exchanger, and the heat exchanger is used to recover exhaust air energy;
fresh air switch controlling means includes:
the motor data acquisition module is used for acquiring the rotating speed and the current of the motor; the rotating speed and current of the motor comprise a fresh air motor rotating speed, a fresh air motor current, an exhaust motor rotating speed and an exhaust motor current;
the first data acquisition module is used for acquiring fresh air volume flow, fresh air fan efficiency and fresh air energy recovery resistance corresponding to the fresh air motor rotating speed and the fresh air motor current from a preset first coefficient table; acquiring the volume flow of exhaust air, the efficiency of an exhaust fan and the recovery resistance of exhaust air energy corresponding to the rotating speed of the exhaust motor and the current of the exhaust motor from a preset first coefficient table; the energy recovery resistance refers to the difference between the pressure difference of the fresh air exchanger before and after the heat exchanger in the energy recovery mode and the pressure difference of the fresh air exchanger before and after the heat exchanger not in the energy recovery mode under the same air volume;
the power consumption increment acquisition module is used for calculating the power consumption increment of the fresh air motor according to the following modes:
Figure GDA0003398839490000031
wherein, Δ NxFor incremental power consumption of the fresh air motor, QxIs the volume flow of fresh air, Δ PxFor recovery of fresh air energyxThe efficiency of the fresh air fan;
calculating the power consumption increment of the air exhaust motor according to the following modes:
Figure GDA0003398839490000032
wherein, Δ NpFor incremental power consumption of the air-exhausting motor, QpFor volume flow of exhaust, Δ PpFor recovery of the energy of the exhaust air, etapThe efficiency of the exhaust fan;
adding the power consumption increment of the fresh air motor and the power consumption increment of the air exhaust motor to obtain the power consumption increment of the motor;
the fresh air data acquisition module is used for acquiring the inlet temperature, the inlet relative humidity, the outlet temperature and the outlet relative humidity of the fresh air exchanger;
the second data acquisition module is used for acquiring an inlet enthalpy value, an outlet enthalpy value, an inlet density and an outlet density which correspond to the inlet temperature, the inlet relative humidity, the outlet temperature and the outlet relative humidity of the fresh air exchanger from a preset second coefficient table;
the average density acquisition module is used for acquiring the average value of the inlet density and the outlet density to obtain the average density;
the energy recovery value acquisition module is used for multiplying the absolute value of the difference value between the inlet enthalpy value and the outlet enthalpy value by the average density and the fresh air volume flow to obtain the energy recovery value of the heat exchanger;
and the control module is used for controlling the heat exchanger to recover energy when the ratio of the energy recovery value to the power consumption increment is larger than a first set value.
In a third aspect, an embodiment of the present application provides a fresh air exchanger, including a motor, a bypass air valve, a controller, and a heat exchanger, where the bypass air valve is disposed on an air inlet channel of the heat exchanger and is used to change a circulation path of air; when the bypass air valve is closed, air enters the heat exchanger; the heat exchanger is used for recovering exhaust energy; the controller is connected with the bypass air valve;
the controller comprises a memory and a processor;
the memory for storing one or more programs;
when executed by the processor, the one or more programs cause the processor to implement the fresh air switch control method according to any one of the above.
In the embodiment of the application, the power consumption increment of the motor is obtained by acquiring the rotating speed and the current of the motor, acquiring the corresponding volume flow, the fan efficiency and the energy recovery resistance from a preset first coefficient table, and dividing the product of the volume flow and the energy recovery resistance by the fan efficiency; the method comprises the steps of obtaining inlet temperature, inlet relative humidity, outlet temperature and outlet relative humidity of a fresh air exchanger, obtaining corresponding inlet enthalpy, outlet enthalpy, inlet density and outlet density from a preset second coefficient table, calculating an average value of the inlet density and the outlet density as an average density, multiplying an absolute value of a difference value of the inlet enthalpy and the outlet enthalpy by the average density and fresh air volume flow to obtain an energy recovery value, and controlling the heat exchanger to recover energy when a ratio of the energy recovery value to power consumption increment is larger than a first set value so as to maximize energy recovery benefits of the fresh air exchanger, reduce energy loss of the fresh air exchanger and save energy.
For a better understanding and practice, the invention is described in detail below with reference to the accompanying drawings.
Drawings
Fig. 1 is a flow chart of a method for controlling a fresh air exchange in an exemplary embodiment of the invention;
fig. 2 is a schematic diagram of a fresh air switch control apparatus according to an exemplary embodiment of the present invention;
fig. 3 is a schematic structural diagram of a fresh air switch according to an exemplary embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
It should be understood that the embodiments described are only some embodiments of the present application, and not all embodiments. All other examples, which can be obtained by a person skilled in the art without making any inventive step based on the embodiments in the present application, belong to the scope of protection of the embodiments in the present application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the application, as detailed in the appended claims. In the description of the present application, it is to be understood that the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not necessarily used to describe a particular order or sequence, nor are they to be construed as indicating or implying relative importance. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In addition, in the description of the present application, "a plurality" means two or more unless otherwise specified. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
The fresh air exchanger control method and the fresh air exchanger control device can be applied to a fresh air exchanger provided with a heat exchanger and used for controlling the opening and closing of the heat exchanger, so that the maximization of energy recovery benefits is realized, and the energy consumption of the fresh air exchanger is reduced. The fresh air exchanger comprises a motor and a heat exchanger, and the heat exchanger is used for recovering exhaust air energy.
As shown in fig. 1, the method for controlling a fresh air exchanger according to the present application includes the following steps:
step S1: acquiring the rotating speed and current of the motor;
the rotating speed and the current of the motor can be detected by a rotating speed detection device and a current detection device which are connected with the motor. The rotation speed detection means may be a rotation speed sensor or a rotation speed detection circuit, and the current detection means may be a current detection means or a current detection circuit. Wherein, for a motor (such as a three-phase alternating current permanent magnet synchronous motor) with a built-in control program or controlled by a frequency converter, the rotating speed and the current of the motor can be directly read from a data interface of the motor or the frequency converter.
Step S2: acquiring volume flow, fan efficiency and energy recovery resistance corresponding to the rotating speed and current of the motor from a preset first coefficient table;
the energy recovery resistance refers to a difference value between a pressure difference between the front and the back of the heat exchanger when the fresh air exchanger is in the energy recovery mode and a pressure difference between the front and the back of the heat exchanger when the fresh air exchanger is not in the energy recovery mode under the same air volume.
The volume flow, the fan efficiency and the energy recovery resistance (or the calculation formulas of the volume flow, the fan efficiency and the energy recovery resistance) corresponding to each rotating speed and current are stored in the preset first coefficient table, and the volume flow, the fan efficiency and the energy recovery resistance corresponding to the rotating speed and the current of the motor are obtained by searching the first coefficient table. The preset first coefficient table may be coefficients related to the volume flow, the fan efficiency, and the energy recovery resistance, which are obtained by a manufacturer through pneumatic and resistance performance tests in advance before leaving a factory.
Step S3: dividing the product of the volume flow and the energy recovery resistance by the fan efficiency to obtain the power consumption increment of the motor;
the product of the volume flow and the energy recovery resistance is the effective power of the motor, and the power consumption increment of the motor is obtained by dividing the effective power of the motor by the efficiency of the fan.
Step S4: acquiring the inlet temperature, inlet relative humidity, outlet temperature and outlet relative humidity of a fresh air exchanger;
the inlet temperature and the inlet relative humidity of the fresh air exchanger can be detected through a temperature sensor and a humidity sensor which are arranged at a fresh air inlet, and the outlet temperature and the outlet relative humidity can be detected through the temperature sensor and the humidity sensor which are arranged at a fresh air outlet.
Step S5: acquiring an inlet enthalpy value, an outlet enthalpy value, an inlet density and an outlet density corresponding to the inlet temperature, the inlet relative humidity, the outlet temperature and the outlet relative humidity of the fresh air exchanger from a preset second coefficient table;
and the inlet enthalpy value, the outlet enthalpy value, the inlet density and the outlet density corresponding to the inlet temperature, the inlet relative humidity, the outlet temperature and the outlet relative humidity of the fresh air exchanger are obtained by searching the second coefficient table.
Step S6: obtaining the average value of the inlet density and the outlet density to obtain the average density;
specifically, the average density was obtained in the following manner:
ρx＝0.5*(ρx1+ρx2)
where ρ isxIs the average density, px1Is inlet density, ρx2Is the outlet density.
Step S7: multiplying the absolute value of the difference value between the inlet enthalpy value and the outlet enthalpy value by the average density and the fresh air volume flow to obtain an energy recovery value of the heat exchanger;
the energy recovery value is the actual energy value recovered by the heat exchanger, namely the energy gain obtained when the fresh air exchanger is in the energy recovery mode. When air passes through the heat exchanger, energy in the exhaust air is recycled to fresh air, so that enthalpy difference between the front and the back of the heat exchanger can be changed. Because the indoor working condition and the outdoor working condition can change along with time or season, the fresh air enthalpy value after passing through the heat exchanger and the fresh air enthalpy value before passing through the heat exchanger can be increased or reduced, the enthalpy difference can be a positive value or a negative value, and therefore in the embodiment of the application, the energy recovery value is calculated according to the absolute value of the enthalpy difference of the inlet and the outlet.
Specifically, the energy recovery value of the heat exchanger is obtained in the following manner:
ΔH＝ρx*Qx*|hx1-hx2|
wherein Δ H is energy recoveryReceiving value ρxIs the average density, hx1Is the inlet enthalpy value, hx2Is the outlet enthalpy.
Step S8: when the ratio of the energy recovery value to the power consumption increment is larger than a first set value, controlling the heat exchanger to recover energy;
the power consumption increment is the energy consumption paid by the fresh air exchanger in the energy recovery mode. When the ratio of the energy recovery value to the power consumption increment is larger than a first set value, the fresh air exchanger can not avoid invalid motor power consumption until energy recovery is carried out, the maximum energy recovery benefit is obtained, and the energy-saving effect is achieved; otherwise, the energy consumption of the fresh air exchanger is increased.
In one embodiment, the fresh air exchanger comprises a bypass air valve, and the bypass air valve is arranged on an air inlet channel of the heat exchanger;
the bypass air valve is used for changing the circulation path of air, when the bypass air valve is closed, the air enters the heat exchanger, when the bypass air valve is opened, the air is discharged outdoors or sent indoors through the bypass air valve, the air does not need to pass through the heat exchanger, and the energy loss of the fresh air exchanger caused by the energy recovery of the heat exchanger is avoided.
The step of controlling the heat exchanger to perform energy recovery comprises the following steps:
and controlling the bypass air valve to be closed.
In the embodiment of the application, the power consumption increment of the motor is obtained by acquiring the rotating speed and the current of the motor, acquiring the corresponding volume flow, the fan efficiency and the energy recovery resistance from a preset first coefficient table, and dividing the product of the volume flow and the energy recovery resistance by the fan efficiency; the method comprises the steps of obtaining inlet temperature, inlet relative humidity, outlet temperature and outlet relative humidity of a fresh air exchanger, obtaining corresponding inlet enthalpy, outlet enthalpy, inlet density and outlet density from a preset second coefficient table, calculating an average value of the inlet density and the outlet density as an average density, multiplying an absolute value of a difference value of the inlet enthalpy and the outlet enthalpy by the average density and fresh air volume flow to obtain an energy recovery value, and controlling the heat exchanger to recover energy when a ratio of the energy recovery value to power consumption increment is larger than a first set value so as to maximize energy recovery benefits of the fresh air exchanger, reduce energy loss of the fresh air exchanger and save energy.
In an exemplary embodiment, the motor includes a fresh air motor and an exhaust air motor; the rotating speed and current of the motor comprise a fresh air motor rotating speed, a fresh air motor current, an exhaust motor rotating speed and an exhaust motor current;
the bypass air valve comprises a fresh air bypass air valve and an exhaust air bypass air valve, the fresh air bypass air valve is arranged between a fresh air channel of the fresh air motor and an air inlet channel of the heat exchanger, and the exhaust air bypass air valve is arranged between an exhaust air channel of the exhaust air motor and an air inlet channel of the heat exchanger.
A step of dividing the product of the volumetric flow and the energy recovery resistance by the fan efficiency to obtain a power consumption increment of the motor, comprising:
acquiring fresh air volume flow, fresh air fan efficiency and fresh air energy recovery resistance corresponding to the rotation speed of the fresh air motor and the current of the fresh air motor from a preset first coefficient table;
the fresh air energy recovery resistance is the difference between the pressure difference between the front and the back of the heat exchanger when the fresh air bypass air valve is in a closed state and the pressure difference between the front and the back of the heat exchanger in an open state under the same air quantity, and the difference is a positive value.
Acquiring the volume flow of exhaust air, the efficiency of an exhaust fan and the recovery resistance of exhaust air energy corresponding to the rotating speed of the exhaust motor and the current of the exhaust motor from a preset second coefficient table;
the exhaust energy recovery resistance is a difference value between the pressure difference between the front and the back of the heat exchanger when the exhaust bypass air valve is in a closed state and the pressure difference between the front and the back of the heat exchanger in an open state under the same air volume, and the difference value is a positive value.
Calculating the power consumption increment of the fresh air motor according to the following modes:
Figure GDA0003398839490000081
wherein the content of the first and second substances,ΔNxfor incremental power consumption of the fresh air motor, QxIs the volume flow of fresh air, Δ PxFor recovery of fresh air energyxThe efficiency of the fresh air fan;
calculating the power consumption increment of the air exhaust motor according to the following modes:
Figure GDA0003398839490000082
wherein, Δ NpFor incremental power consumption of the air-exhausting motor, QpFor volume flow of exhaust, Δ PpFor recovery of the energy of the exhaust air, etapThe efficiency of the exhaust fan;
and adding the power consumption increment of the fresh air motor and the power consumption increment of the air exhaust motor to obtain the power consumption increment of the motor.
In a preferred embodiment, in order to ensure the maximization of the energy recovery benefit of the fresh air exchanger, an energy comparison coefficient is introduced for evaluating the energy recovery benefit of the fresh air exchanger, and the heat exchanger is controlled to perform energy recovery only when the energy comparison coefficient is greater than a first set value. Therefore, before the step of controlling the heat exchanger to perform energy recovery, the method further comprises the following steps:
acquiring an energy comparison coefficient according to the following modes:
Figure GDA0003398839490000083
wherein E isβEnergy ratio coefficient, Δ H is energy recovery value, Δ NpFor incremental power consumption of the exhaust motor, Δ NxThe power consumption increment of the fresh air motor is obtained;
and if the energy comparison coefficient is larger than a first set value, closing the bypass air valve.
And if the energy comparison coefficient is less than or equal to a first set value, opening the bypass air valve.
The first set value is a reference value set by a program and used for judging the size of the energy comparison coefficient, and the first set value is greater than or equal to the energy efficiency ratio of the corresponding air conditioning system. Specifically, the first set value may also be set according to an actual operation condition or an engineering practice of the fresh air exchanger.
In a preferred embodiment, before the step of closing the bypass damper, the method further comprises:
detecting whether a bypass air valve is in an opening state or not;
if the bypass air valve is in an opening state, closing the bypass air valve; otherwise, keeping the current mode to continue running.
As shown in fig. 2, the embodiment of the present application further provides a fresh air exchanger control device,
the motor data acquisition module 1 is used for acquiring the rotating speed and the current of the motor;
the first data acquisition module 2 is used for acquiring the volume flow, the fan efficiency and the energy recovery resistance corresponding to the rotating speed and the current of the motor from a preset first coefficient table;
the power consumption increment obtaining module 3 is used for dividing the product of the volume flow and the energy recovery resistance by the fan efficiency to obtain the power consumption increment of the motor;
the fresh air data acquisition module 4 is used for acquiring the inlet temperature, the inlet relative humidity, the outlet temperature and the outlet relative humidity of the fresh air exchanger;
the second data acquisition module 5 is configured to acquire an inlet enthalpy value, an outlet enthalpy value, an inlet density, and an outlet density, which correspond to the inlet temperature, the inlet relative humidity, the outlet temperature, and the outlet relative humidity of the fresh air exchanger, from a preset second coefficient table;
an average density obtaining module 6, configured to obtain an average value of the inlet density and the outlet density to obtain an average density;
the energy recovery value acquisition module 7 is used for multiplying the absolute value of the difference value between the inlet enthalpy value and the outlet enthalpy value by the average density and the fresh air volume flow to obtain the energy recovery value of the heat exchanger;
and the control module 8 is used for controlling the heat exchanger to recover energy when the ratio of the energy recovery value to the power consumption increment is larger than a first set value.
It should be noted that, when the fresh air switch control device provided in the foregoing embodiment executes the fresh air switch control method, only the division of the above functional modules is taken as an example, and in practical applications, the functions may be allocated to different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules to complete all or part of the functions described above. In addition, the fresh air exchanger control device and the fresh air exchanger control method provided by the above embodiment belong to the same concept, and the detailed implementation process is shown in the method embodiment and is not described herein again.
As shown in fig. 3, an embodiment of the present application further provides a fresh air exchanger, which includes a fresh air motor 101, an exhaust motor 102, a fresh air bypass air valve 201, an exhaust air bypass air valve 202, a controller (not shown), and a heat exchanger 300, where the fresh air bypass air valve 201 is disposed between a fresh air channel of the fresh air motor and an air inlet channel of the heat exchanger 300, and the exhaust air bypass air valve 202 is disposed between an exhaust air channel of the exhaust motor and an air inlet channel of the heat exchanger 300.
The bypass air valve is used for changing the circulation path of air and controlling the air to enter the heat exchanger 300 through an air inlet channel or to be discharged outdoors or sent indoors through the bypass air valve; wherein, when the bypass damper is closed, air enters the heat exchanger 300; the heat exchanger 300 is used for recovering exhaust air energy; the controller 300 is connected with the bypass air valve 200;
the controller comprises a memory and a processor;
the memory for storing one or more programs;
when executed by the processor, the one or more programs cause the processor to implement the fresh air switch control method according to any one of the above.
The present invention is not limited to the above-described embodiments, and various modifications and variations of the present invention are intended to be included within the scope of the claims and the equivalent technology of the present invention if they do not depart from the spirit and scope of the present invention.

Claims (8)

1. A control method of a fresh air exchanger is characterized in that the fresh air exchanger comprises a motor and a heat exchanger, and the heat exchanger is used for recovering exhaust energy;
the control method of the fresh air exchanger comprises the following steps:
acquiring the rotating speed and current of the motor; the rotating speed and current of the motor comprise a fresh air motor rotating speed, a fresh air motor current, an exhaust motor rotating speed and an exhaust motor current;
acquiring fresh air volume flow, fresh air fan efficiency and fresh air energy recovery resistance corresponding to the rotation speed of the fresh air motor and the current of the fresh air motor from a preset first coefficient table;
acquiring the volume flow of exhaust air, the efficiency of an exhaust fan and the recovery resistance of exhaust air energy corresponding to the rotating speed of the exhaust motor and the current of the exhaust motor from a preset first coefficient table; the energy recovery resistance refers to the difference between the pressure difference of the fresh air exchanger before and after the heat exchanger in the energy recovery mode and the pressure difference of the fresh air exchanger before and after the heat exchanger not in the energy recovery mode under the same air volume;
calculating the power consumption increment of the fresh air motor according to the following modes:
Figure FDA0003398839480000011
wherein, Δ NxFor incremental power consumption of the fresh air motor, QxIs the volume flow of fresh air, Δ PxFor recovery of fresh air energyxThe efficiency of the fresh air fan;
calculating the power consumption increment of the air exhaust motor according to the following modes:
Figure FDA0003398839480000012
wherein，ΔNpFor incremental power consumption of the air-exhausting motor, QpFor volume flow of exhaust, Δ PpFor recovery of the energy of the exhaust air, etapThe efficiency of the exhaust fan;
adding the power consumption increment of the fresh air motor and the power consumption increment of the air exhaust motor to obtain the power consumption increment of the motor;
acquiring the inlet temperature, inlet relative humidity, outlet temperature and outlet relative humidity of a fresh air exchanger;
acquiring an inlet enthalpy value, an outlet enthalpy value, an inlet density and an outlet density corresponding to the inlet temperature, the inlet relative humidity, the outlet temperature and the outlet relative humidity of the fresh air exchanger from a preset second coefficient table;
obtaining the average value of the inlet density and the outlet density to obtain the average density;
multiplying the absolute value of the difference value between the inlet enthalpy value and the outlet enthalpy value by the average density and the fresh air volume flow to obtain an energy recovery value of the heat exchanger;
and when the ratio of the energy recovery value to the power consumption increment is larger than a first set value, controlling the heat exchanger to recover energy.
2. The fresh air exchanger control method according to claim 1, wherein: the motor comprises a fresh air motor and an air exhaust motor;
the bypass air valve comprises a fresh air bypass air valve and an exhaust air bypass air valve, the fresh air bypass air valve is arranged between a fresh air channel of the fresh air motor and an air inlet channel of the heat exchanger, and the exhaust air bypass air valve is arranged between an exhaust air channel of the exhaust air motor and an air inlet channel of the heat exchanger.
3. The method for controlling a fresh air exchanger according to claim 1, further comprising, before the step of controlling the heat exchanger to perform energy recovery:
acquiring an energy comparison coefficient according to the following modes:
Figure FDA0003398839480000021
wherein E isβEnergy ratio coefficient, Δ H is energy recovery value, Δ NpFor incremental power consumption of the exhaust motor, Δ NxThe power consumption increment of the fresh air motor is obtained;
and if the energy comparison coefficient is larger than a first set value, closing the bypass air valve.
4. The fresh air exchanger control method according to claim 3, further comprising, before the step of closing the bypass damper:
detecting whether a bypass air valve is in an opening state or not;
if the bypass air valve is in an opening state, closing the bypass air valve; otherwise, keeping the current mode to continue running.
5. A fresh air switch control method according to claim 3, wherein: after the step of obtaining the energy alignment coefficient, the method further comprises the following steps:
and if the energy comparison coefficient is less than or equal to a first set value, opening the bypass air valve.
6. The fresh air exchanger control method according to claim 1, wherein: the fresh air exchanger comprises a bypass air valve, and the bypass air valve is arranged on an air inlet channel of the heat exchanger and used for changing the circulation path of air; when the bypass air valve is closed, air enters the heat exchanger;
the step of controlling the heat exchanger to perform energy recovery comprises the following steps:
and controlling the bypass air valve to be closed.
7. A control device of a fresh air exchanger is characterized in that the fresh air exchanger comprises a motor and a heat exchanger, and the heat exchanger is used for recovering exhaust energy;
fresh air switch controlling means includes:
the motor data acquisition module is used for acquiring the rotating speed and the current of the motor; the rotating speed and current of the motor comprise a fresh air motor rotating speed, a fresh air motor current, an exhaust motor rotating speed and an exhaust motor current;
the first data acquisition module is used for acquiring fresh air volume flow, fresh air fan efficiency and fresh air energy recovery resistance corresponding to the fresh air motor rotating speed and the fresh air motor current from a preset first coefficient table; acquiring the volume flow of exhaust air, the efficiency of an exhaust fan and the recovery resistance of exhaust air energy corresponding to the rotating speed of the exhaust motor and the current of the exhaust motor from a preset first coefficient table; the energy recovery resistance refers to the difference between the pressure difference of the fresh air exchanger before and after the heat exchanger in the energy recovery mode and the pressure difference of the fresh air exchanger before and after the heat exchanger not in the energy recovery mode under the same air volume;
the power consumption increment acquisition module is used for calculating the power consumption increment of the fresh air motor according to the following modes:
Figure FDA0003398839480000031
wherein, Δ NxFor incremental power consumption of the fresh air motor, QxIs the volume flow of fresh air, Δ PxFor recovery of fresh air energyxThe efficiency of the fresh air fan;
calculating the power consumption increment of the air exhaust motor according to the following modes:
Figure FDA0003398839480000032
wherein, Δ NpFor incremental power consumption of the air-exhausting motor, QpFor volume flow of exhaust, Δ PpFor recovery of the energy of the exhaust air, etapThe efficiency of the exhaust fan;
adding the power consumption increment of the fresh air motor and the power consumption increment of the air exhaust motor to obtain the power consumption increment of the motor;
the fresh air data acquisition module is used for acquiring the inlet temperature, the inlet relative humidity, the outlet temperature and the outlet relative humidity of the fresh air exchanger;
the second data acquisition module is used for acquiring an inlet enthalpy value, an outlet enthalpy value, an inlet density and an outlet density which correspond to the inlet temperature, the inlet relative humidity, the outlet temperature and the outlet relative humidity of the fresh air exchanger from a preset second coefficient table;
the average density acquisition module is used for acquiring the average value of the inlet density and the outlet density to obtain the average density;
the energy recovery value acquisition module is used for multiplying the absolute value of the difference value between the inlet enthalpy value and the outlet enthalpy value by the average density and the fresh air volume flow to obtain the energy recovery value of the heat exchanger;
and the control module is used for controlling the heat exchanger to recover energy when the ratio of the energy recovery value to the power consumption increment is larger than a first set value.
8. A new trend switch, its characterized in that: the air conditioner comprises a motor, a bypass air valve, a controller and a heat exchanger, wherein the bypass air valve is arranged on an air inlet channel of the heat exchanger and used for changing the circulation path of air; when the bypass air valve is closed, air enters the heat exchanger; the heat exchanger is used for recovering exhaust energy; the controller is connected with the bypass air valve;
the controller comprises a memory and a processor;
the memory for storing one or more programs;
when executed by the processor, the one or more programs cause the processor to implement the fresh air switch control method according to any one of claims 1 to 6.
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