CN108534290B - Fresh air unit control method and fresh air unit - Google Patents

Fresh air unit control method and fresh air unit Download PDF

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Publication number
CN108534290B
CN108534290B CN201810361023.3A CN201810361023A CN108534290B CN 108534290 B CN108534290 B CN 108534290B CN 201810361023 A CN201810361023 A CN 201810361023A CN 108534290 B CN108534290 B CN 108534290B
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China
Prior art keywords
fresh air
air
heat exchange
duct
handling unit
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CN201810361023.3A
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Chinese (zh)
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CN108534290A (en
Inventor
张龙爱
莫湛
何伟光
高朋
陈业成
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Publication of CN108534290A publication Critical patent/CN108534290A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
    • F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
    • F24F7/08—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit with separate ducts for supplied and exhausted air with provisions for reversal of the input and output systems
    • 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
    • F24F11/70—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
    • F24F12/001—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air
    • F24F12/006—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air using an air-to-air heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/30—Arrangement or mounting of heat-exchangers
    • 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
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • 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
    • F24F2110/50—Air quality properties
    • F24F2110/64—Airborne particle content
    • 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
    • F24F2110/50—Air quality properties
    • F24F2110/65—Concentration of specific substances or contaminants
    • F24F2110/70—Carbon dioxide
    • 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]
    • Y02B30/56—Heat recovery units

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Air-Flow Control Members (AREA)

Abstract

The application relates to a fresh air unit control method and a fresh air unit, wherein the fresh air unit control method comprises the following steps of switching heat exchange modes: when the outdoor fresh air temperature Tw is less than or equal to the winter working condition critical temperature Tx or the outdoor fresh air temperature Tw is more than or equal to the summer working condition critical temperature Ts, the fresh air unit is enabled to work in a heat exchange mode of fresh air and return air heat exchange; and a drainage step: in heat exchange mode, CO is used every time in a room 2 Concentration Mco 2 The content of CO is less than or equal to preset 2 Concentration M 1 When the air conditioner is in operation, part of return air in the return air inlet air duct is led into the fresh air outlet air duct until the CO in the room 2 Concentration Mco 2 Preset CO 2 Concentration M 1 And stopping drainage when the water is stopped. The fresh air handling unit control method is based on indoor CO in a heat exchange mode 2 Concentration Mco 2 As control parameters, part of return air in the return air inlet air duct is led into the fresh air outlet air duct, so that the fresh air inlet quantity of the fresh air unit and the heat exchange quantity of the fresh air in the heat exchange mode are reduced, and the running power consumption of the unit is effectively reduced.

Description

Fresh air unit control method and fresh air unit
Technical Field
The application relates to the technical field of air conditioning, in particular to a fresh air unit control method and a fresh air unit.
Background
The fresh air haze removal device is widely applied to civil comfort occasions such as green buildings, transportation hubs, educational medical treatment and the like. At present, the market does not have a new fan capable of adjusting the operation mode of the new fan according to the target parameters, the market generally has a bypass mode at the air return side, and the bypass operation mode is single and has little practical significance, so that a technical scheme capable of adjusting the operation mode according to the setting of the target parameters is urgently needed.
In addition, the fresh air handling unit in the market at present generally adopts a damper structure to realize opening and closing of an air duct so as to switch between different working modes such as a total heat exchange function, a bypass or an internal circulation function and the like. Because the air valve structure is large in size, more air valves are difficult to be arranged in the fresh air unit to be combined so as to flexibly realize various functions, products on the market have a one-way bypass function or an internal circulation function, and the unit is large in size or has no functions in the aspect.
In addition, the air valve structure drives the air door attached to the air port to move through the motor, and after the air valve runs for a long time, the phenomenon that the hinge is rusted and loosened can occur, and the air valve can be blocked in the moving process. In addition, in the state where the damper is closed, there is also an unavoidable gap between the damper and the tuyere, and thus it is difficult to achieve a superior sealing effect.
Disclosure of Invention
In order to overcome the technical defects, the application solves the technical problems of providing a fresh air unit control method and a fresh air unit, and can reduce the running power consumption of the unit.
In order to solve the technical problems, the application provides a fresh air handling unit control method, which comprises the following steps:
a heat exchange mode switching step: when the outdoor fresh air temperature Tw is less than or equal to the winter working condition critical temperature Tx or the outdoor fresh air temperature Tw is more than or equal to the summer working condition critical temperature Ts, the fresh air unit is enabled to work in a heat exchange mode of fresh air and return air heat exchange;
and (3) drainage: in the heat exchange mode of operation,indoor CO whenever 2 Concentration Mco 2 The content of CO is less than or equal to preset 2 Concentration M 1 When the air conditioner is in operation, part of return air in the return air inlet air duct is led into the fresh air outlet air duct until the CO in the room 2 Concentration Mco 2 Preset CO 2 Concentration M 1 And stopping drainage when the water is stopped.
Further, before stopping the drainage, the flow of partial return air from the return air inlet air duct to the fresh air outlet air duct is gradually increased.
Further, the method also comprises a fresh air bypass mode switching step: when the critical temperature Tx of the working condition in winter is less than the critical temperature Tx of the fresh air in the outdoor, the critical temperature Ts of the working condition in summer is less than the concentration value M of the PM2.5 in the outdoor PM2.5 The concentration M of PM2.5 is less than or equal to preset 2 And when the fresh air fan is started, the exhaust fan is closed, and the fresh air unit works in a fresh air bypass mode.
Further, the method also comprises a double bypass mode switching step: when the critical temperature Tx of the working condition in winter is less than the critical temperature Tx of the fresh air in the outdoor, the critical temperature Ts of the working condition in summer is less than the concentration value M of the PM2.5 in the outdoor PM2.5 > preset PM2.5 concentration M 2 And when the fresh air fan and the exhaust fan are started, the fresh air unit works in a fresh air return double bypass mode.
Further, the method also comprises a step of switching the fresh air exhausting and mixing modes: after the machine is started, the fresh air fan is started, the exhaust fan is closed, and the fresh air unit works in a fresh air exhaust and air mixing mode.
Further, in a fresh air exhaust air mixing mode, the mixing proportion of fresh air and return air is 1:1.
The application also provides a fresh air handling unit, which comprises:
the shell is internally provided with a fresh air channel and a return air channel, wherein the fresh air channel comprises a fresh air inlet channel and a fresh air outlet channel, and the return air channel comprises a return air inlet channel and a return air outlet channel; and
the heat exchange core body is arranged in the shell and is used for enabling the fresh air handling unit to work between a heat exchange mode and a heat exchange release mode;
the air valve is arranged between the return air inlet air channel and the fresh air outlet air channel and is used for guiding part of return air in the return air inlet air channel to the fresh air outlet air channel when the air valve is opened in a heat exchange mode.
Further, the heat exchange core is movably arranged in the shell and is used for enabling the fresh air inlet air channel and the return air inlet air channel to be respectively communicated with the fresh air outlet air channel and the return air outlet air channel through the heat exchange core in a state of moving to the first position, so that the fresh air unit works in a heat exchange mode; and under the state of moving to the second position, the heat exchange core body stops working so as to enable the fresh air handling unit to be in a heat exchange release mode.
Further, the heat exchange core is rotatably disposed.
Further, the heat exchange core is rotatably disposed with its own geometric center as an axis.
Further, a plurality of partition plates are arranged in the shell and used for dividing the space in the shell into four side-by-side air duct sections, wherein two air duct sections respectively form a fresh air inlet air duct and a fresh air outlet air duct, the other two air duct sections respectively form a return air inlet air duct and a return air outlet air duct, and the heat exchange core body is arranged in the middle two air duct sections.
Further, the fresh air outlet air channel is adjacent to the return air inlet air channel, and the air valve is arranged on a partition plate between the fresh air outlet air channel and the return air inlet air channel.
Further, a fresh air inlet, a fresh air outlet, a return air inlet and a return air outlet are arranged on one side edge of the shell side by side.
Further, the heat exchange core is in a regular polygon shape.
Further, the heat exchange device also comprises a plurality of flexible sealing pieces, and the heat exchange core body can be in contact sealing with each sealing piece in a state of moving to the first position, so that the fresh air inlet air channel and the return air inlet air channel are respectively communicated with the fresh air outlet air channel and the return air outlet air channel through the heat exchange core body; and in the state of moving to the second position, the heat exchange core body is stopped by being separated from the sealing state of at least part of the sealing parts.
Further, the sealing elements are uniformly distributed along the circumferential direction of the heat exchange core body.
Further, the heat exchange core body is rotatably arranged, the heat exchange core body is in a regular polygon shape, when the heat exchange core body rotates to a first position, the vertex of the regular polygon is in contact sealing with the sealing element, and when the heat exchange core body rotates to a second position, the side of the regular polygon is opposite to the sealing element, and a gap is generated.
Further, the seal is an air bag.
Further, the heat exchange device also comprises a sealing state adjusting component arranged in the shell and used for actively adjusting the sealing state between the sealing piece and the heat exchange core body.
Further, the sealing element is an air bag, and the sealing state adjusting part comprises an inflation and deflation mechanism for adjusting the inflation amount of the air bag so as to realize the inflation or the deflation of the air bag.
Further, a control part is further included, and the amount of inflation required for the air bag and the heat exchange core to be in a sealed state and the amount of inflation required for the air bag and the heat exchange core to be kept in a preset gap therebetween are stored in advance in the control part.
Further, the sealing state adjusting means includes a linear driving mechanism for driving the sealing member to translate toward or away from the heat exchange core.
Therefore, based on the technical scheme, the fresh air handling unit control method is realized according to indoor CO in a heat exchange mode 2 Concentration Mco 2 As control parameters, part of return air in the return air inlet air duct is led into the fresh air outlet air duct, so that the fresh air inlet quantity of the fresh air unit and the heat exchange quantity of the fresh air in the heat exchange mode are reduced, and the running power consumption of the unit is effectively reduced. The fresh air handling unit provided by the application has the beneficial technical effects correspondingly.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is a schematic diagram of a fresh air handling unit in an initial state before starting up;
FIG. 2 is a schematic diagram of the structure of the fresh air handling unit of the present application when the fresh air handling unit is operating in a fresh air exhaust and mixing mode;
FIG. 3 is a schematic view of an embodiment of a rotating mechanism in a fresh air handling unit according to the present application;
FIG. 4 is a schematic diagram of the structure of the fresh air handling unit of the present application when the fresh air handling unit is operating in a heat exchange mode;
FIG. 5 is a schematic diagram of the structure of the fresh air handling unit of the present application when the fresh air handling unit is operating in a fresh air bypass mode;
fig. 6 is a schematic structural diagram of the fresh air handling unit of the present application when operating in a fresh air return double bypass mode.
Each reference numeral represents:
1. a housing; 2. a heat exchange core; 3. a driving mechanism; 31. a drive gear; 32. a driven gear; 4. fresh air blower; 5. an exhaust fan; 6. a partition plate; 7. a seal; 8. an air duct section; 9. and an air valve.
Detailed Description
The technical scheme of the application is further described in detail through the drawings and the embodiments.
The specific embodiments of the present application are to facilitate further explanation of the concept of the present application, the technical problems to be solved, the technical features constituting the technical solutions, and the technical effects brought thereby. The description of these embodiments does not limit the present application. The technical features of the embodiments of the present application described below may be combined with each other as long as they do not collide with each other.
In one aspect, the present application provides a method for controlling a fresh air handling unit, in some exemplary embodiments, the method includes:
a heat exchange mode switching step: when the outdoor fresh air temperature Tw is less than or equal to the winter working condition critical temperature Tx or the outdoor fresh air temperature Tw is more than or equal to the summer working condition critical temperature Ts, the fresh air unit is enabled to work in a heat exchange mode of fresh air and return air heat exchange;
and (3) drainage: in heat exchange mode, CO is used every time in a room 2 Concentration Mco 2 The content of CO is less than or equal to preset 2 Concentration M 1 When it willPart of the return air in the return air inlet duct is led into the fresh air outlet duct until the CO in the room 2 Concentration Mco 2 Preset CO 2 Concentration M 1 And stopping drainage when the water is stopped.
In the illustrative embodiment, when the outdoor fresh air temperature Tw is less than or equal to the critical temperature Tx of the winter working condition, the fresh air unit is judged to be in the winter working condition, so that the fresh air unit is switched to a heat exchange mode of fresh air and return air heat exchange as shown in fig. 4; when the outdoor fresh air temperature Tw is not less than the summer working condition critical temperature Ts, the fresh air unit is judged to be in the summer working condition at the moment, and therefore the fresh air unit is switched to a fresh air and return air heat exchange mode shown in fig. 4. When indoor CO 2 Concentration Mco 2 The content of CO is less than or equal to preset 2 Concentration M 1 When the air conditioner is used, part of return air in the return air inlet air duct is led into the fresh air outlet air duct, and part of return air enters the room from the fresh air outlet air duct after not exchanging heat, so that the heat exchange of the part of return air is reduced, and the fresh air inlet quantity and the fresh air heat exchange quantity of the fresh air unit in a heat exchange mode are reduced, thereby achieving the purposes of saving energy and reducing the running power consumption of the fresh air unit. When indoor CO 2 Concentration Mco 2 Preset CO 2 Concentration M 1 When the drainage is stopped, then according to the indoor CO 2 Concentration Mco 2 The steps are repeated, so that a more comfortable effect is achieved. To further enhance comfort, in some further embodiments, the flow of the portion of the return air diverted from the return air inlet duct into the fresh air outlet duct is gradually increased prior to stopping diversion.
The following description is needed: summer critical temperature Ts, winter critical temperature Tx, and preset CO 2 Concentration M 1 All the parameter values are set according to the needs, and can be set freely by a control person.
In some improved embodiments, the control method further includes a fresh air bypass mode switching step: when the critical temperature Tx of the working condition in winter is less than the critical temperature Tx of the fresh air in the outdoor, the critical temperature Ts of the working condition in summer is less than the concentration value M of the PM2.5 in the outdoor PM2.5 The concentration M of PM2.5 is less than or equal to preset 2 When the fresh air fan is started, the exhaust air fan is closedThe fresh air handling unit is operated in a fresh air bypass mode as shown in fig. 5. When the critical temperature Tx of the working condition in winter is less than the critical temperature Tw of the fresh air outside the room and is less than the critical temperature Ts of the working condition in summer, the fresh air unit is judged to be in the working condition of transitional seasons, and when the concentration value M of the PM2.5 outside the room is the value M PM2.5 The concentration M of PM2.5 is less than or equal to preset 2 When the air exhaust fan is started, the air exhaust fan is closed, indoor air exhaust is performed naturally through gaps such as doors and windows, the air exhaust fan is not started, and energy is saved.
In some improved embodiments, the control method further comprises a double bypass mode switching step: when the critical temperature Tx of the working condition in winter is less than the critical temperature Tx of the fresh air in the outdoor, the critical temperature Ts of the working condition in summer is less than the concentration value M of the PM2.5 in the outdoor PM2.5 > preset PM2.5 concentration M 2 And when the fresh air fan and the exhaust fan are started, the fresh air unit works in a fresh air return double bypass mode shown in figure 6. When the critical temperature Tx of the working condition in winter is less than the critical temperature Tw of the fresh air outside the room and is less than the critical temperature Ts of the working condition in summer, the fresh air unit is judged to be in the working condition of transitional seasons, and when the concentration value M of the PM2.5 outside the room is the value M PM2.5 > preset PM2.5 concentration M 2 When the air exhaust fan is started, the fresh air fan and the air exhaust fan are started simultaneously, indoor air exhaust is achieved through the air exhaust fan, and air exhaust efficiency is quickened.
In some improved embodiments, the control method further includes a fresh air exhaust and air mixing mode switching step: as shown in fig. 2, after the machine is started, the fresh air fan is started, the exhaust fan is closed, and the fresh air unit is operated in a fresh air exhaust and air mixing mode. Wherein, further, the mixing proportion of fresh air and return air is 1:1.
Based on the same technical conception, the application also provides a fresh air unit which can be a total heat fresh air unit and can adopt suspended ceiling type, vertical cabinet type, wall hanging type and other structures. In some illustrative embodiments, as shown in fig. 1-6, the fresh air handling unit includes:
the shell 1 is internally provided with a fresh air channel and a return air channel, wherein the fresh air channel comprises a fresh air inlet channel and a fresh air outlet channel, and the return air channel comprises a return air inlet channel and a return air outlet channel; and
the heat exchange core body 2 is arranged in the shell 1 and is used for enabling the fresh air handling unit to work between a heat exchange mode and a heat exchange release mode;
and the air valve 9 is arranged between the return air inlet air channel and the fresh air outlet air channel and is used for guiding part of return air in the return air inlet air channel into the fresh air outlet air channel when the air valve is opened in the heat exchange mode.
In this exemplary embodiment, the fresh air handling unit sets up damper 9 through between return air income wind channel and fresh air outlet wind channel, as shown in fig. 4, damper 9 can open in the time of going into the wind channel with return air in the return air income wind channel in the fresh air outlet wind channel when heat exchange mode, and a portion return air gets into indoor from the fresh air outlet wind channel after not exchanging heat, has reduced the heat transfer of this portion return air on the one hand, has reduced the income amount of fresh air and the heat exchange volume of fresh air handling unit under the heat exchange mode on the other hand to reach energy-conservation, reduce the purpose of fresh air handling unit's running consumption.
In some improved embodiments, as shown in fig. 1 to 6, the heat exchange core 2 is movably disposed in the casing 1, so that the fresh air inlet duct and the return air inlet duct are respectively communicated with the fresh air outlet duct and the return air outlet duct through the heat exchange core 2 in a state of moving to the first position, so that the fresh air unit works in a heat exchange mode; and in the state of moving to the second position, the heat exchange core body 2 is stopped to make the fresh air handling unit in the heat exchange release mode.
The fresh air handling unit can realize different functions by controlling the movement of the heat exchange core body 2 according to different use requirements of users. In the heat exchange mode, as shown in fig. 4, the fresh air duct and the return air duct have air flowing at the same time, and the outdoor fresh air entering the fresh air inlet duct and the indoor air entering the return air inlet duct are subjected to heat exchange through the heat exchange core 2, so that the heat exchange device is suitable for being used in a period with a large indoor and outdoor temperature difference. In the heat exchange release mode, a plurality of different working modes can be included, for example, the functions of indoor circulation or filtration and the like are realized when the indoor and outdoor temperature difference is small, and the working modes are not working.
The fresh air handling unit of this embodiment, the heat exchange core 2 is movably arranged in the casing 1, can switch between the first position and the second position through the heat exchange core 2, realizes different working modes, so that the fresh air handling unit realizes different functions. Compared with the mode of realizing different functions of a fresh air system by selectively controlling the opening and closing of different air valves in the prior art, the fresh air unit is structurally controlled without arranging a plurality of air valves, and the direction of fresh air and return air flow can be changed by switching the movement positions of the heat exchange core bodies so as to realize different functions, so that the whole structure of the unit is more compact, the control is simple and reliable, and the fresh air unit has multiple functions.
In some embodiments, as shown in fig. 1, 2 and 4, the heat exchange core 2 is rotatably disposed. The arrangement mode can reduce the movement space occupied by the heat exchange core body 2 when position switching is realized, so that the whole structure of the unit is more compact. Alternatively, the heat exchange core 2 may also be moved in a translational manner.
Preferably, as shown in fig. 2 and 4, the heat exchange core 2 is rotatably disposed with its own geometric center as an axis. The arrangement mode can enable the heat exchange core body 2 not to occupy extra space in the rotation process, and enables the rotation process of the heat exchange core body 2 to be more stable and reliable, so that shaking is not easy to occur. In addition, the air duct structure or other parts in the shell 1 are designed to be symmetrical relative to the heat exchange core 2, and the internal structure of the fresh air handling unit is optimized.
On the basis, as shown in fig. 1-4, the fresh air handling unit further comprises a driving mechanism 3 for driving the heat exchange core 2 to move. Different types of drive mechanisms 3 may be selected depending on the different modes of movement of the heat exchange core 2. The control part can be arranged in the fresh air unit, and the driving mechanism 3 is controlled by the control part to drive the heat exchange core body 2 to move, so that the mode of the fresh air unit can be automatically switched. Alternatively, the movement of the heat exchange core 2 may also be controlled manually.
As shown in fig. 1 to 4, the heat exchange core 2 is rotatably disposed around its geometric center as an axis, and the driving mechanism 3 may be a gear drive, belt drive, chain drive or other driving mechanism capable of outputting a rotational motion. Preferably, as shown in fig. 3, the driving mechanism 3 includes a power member, which may be a stepping motor, a driving gear 31, and a driven gear 32, and the driven gear 32 may be coaxially disposed with the heat exchange core 2 to drive the heat exchange core 2 to rotate about its own axis. The driving mechanism 3 can make the rotation process of the heat exchange core 2 smoother, and can control the movement position of the heat exchange core 2 relatively accurately.
As shown in fig. 4, a plurality of partitions 6 are disposed in the housing 1 and are used for dividing the space in the housing 1 into four side-by-side air duct sections 8, wherein two air duct sections 8 respectively form a fresh air inlet air duct and a fresh air outlet air duct, the other two air duct sections 8 respectively form a return air inlet air duct and a return air outlet air duct, and the heat exchange core 2 is disposed in the middle two air duct sections 8. In the embodiment, the fresh air duct and the return air duct are both designed into a turning type structure, so that the whole length of the duct can be shortened, and the space occupied by the fresh air unit along the length direction of the duct is reduced. The heat exchange core body 2 is arranged in the middle two air duct sections 8, and fresh air and return air flows can fully utilize each part of the heat exchange core body 2 to perform uniform heat exchange when passing through the heat exchange core body 2, so that the heat exchange efficiency is improved.
Further, as shown in fig. 4, the fresh air outlet air duct is adjacent to the return air inlet air duct, and the air valve 9 is arranged on the partition plate 6 between the fresh air outlet air duct and the return air inlet air duct, so that the structure is compact, the occupied space is reduced, and the practicability is high.
In some embodiments, as shown in fig. 1, 2 and 4, a fresh air inlet, a fresh air outlet, a return air inlet and a return air outlet are arranged side by side on one side edge of the casing 1, the fresh air inlet and the fresh air outlet are respectively located at two ends of the fresh air duct, and the return air inlet and the return air outlet are respectively located at two ends of the return air duct. The air inlets and the air outlets are arranged on the same side of the shell 1, so that the length of the air duct can be prolonged, a stable gas flow field is formed in the air duct, and the heat exchange or the filtration of gas is facilitated.
Specifically, the following arrangement modes of the air inlet and the air outlet are all within the protection scope of the application.
First, as shown in fig. 4, the fresh air inlet and the fresh air outlet are respectively corresponding to two air duct sections 8 in the middle of the casing 1, and the return air inlet and the return air outlet are respectively corresponding to two air duct sections 8 on the side of the casing 1.
And secondly, a fresh air inlet and a fresh air outlet are respectively and correspondingly arranged with two air channel sections 8 at the side part of the shell 1, and a return air inlet and a return air outlet are respectively and correspondingly arranged with two air channel sections 8 in the middle of the shell 1.
And thirdly, a fresh air inlet and a fresh air outlet are respectively and correspondingly arranged with two air channel sections 8 adjacent to one side of the shell 1, and a return air inlet and a return air outlet are respectively and correspondingly arranged with two air channel sections 8 adjacent to the other side of the shell 1.
Fourth, new trend entry and new trend export set up with two spaced wind channel sections 8 respectively, and return air entry and return air export set up with two other spaced wind channel sections 8 respectively.
In the above arrangement modes of the air inlet and the air outlet, preferably, the fresh air inlet, the fresh air outlet, the return air inlet and the return air outlet are arranged at positions which enable the fresh air flow and the return air flow to relatively pass through the heat exchange core 2, so that the heat exchange efficiency is improved in a gas convection mode.
In some embodiments, as shown in fig. 4, the heat exchange core 2 is a regular polygon. The adoption of the regular polygon design is beneficial to improving the symmetry of the air duct and the arrangement of all parts in the shell 1, so that the structure of the fresh air handling unit is compact, and when the position is required to be switched, the rotating direction of the heat exchange core body 2 is not required, and the rotating angle of the heat exchange core body 2 is easy to set.
On the basis of the above embodiment, as shown in fig. 4, the fresh air handling unit of the present application further includes a plurality of flexible sealing members 7, and in a state that the heat exchange core 2 moves to the first position, as shown in fig. 1, the fresh air duct and the return air duct are respectively communicated through the heat exchange core 2 by contacting and sealing with each sealing member 7; and in the state of movement to the second position, as shown in fig. 1, 2, 5 and 6, the heat exchange core 2 is stopped by being out of sealing with at least part of the sealing member 7.
The state of the seal member 7 may be expansion or contraction of the volume of the seal member 7 itself, or may be translation of the seal member 7 in a direction approaching or separating from the side wall of the air duct. In addition, in the state of contact sealing, the sealing state adjusting component can also adjust the contact pretightening force of the sealing element 7 and the side wall of the air duct so as to adjust the sealing degree of the sealing element 7 and the side wall of the air duct.
The embodiment of the fresh air component has at least one of the following advantages:
(1) The air duct can be flexibly opened and closed through the sealing state adjusting component, and the control is simple and convenient.
(2) Under the control of the sealing state adjusting component, the flexible sealing element can eliminate the contact gap through self deformation, and increase the contact pretightening force so as to be more tightly attached to the sealing surface, thereby optimizing the sealing effect.
(3) The sealing element is sealed through volume expansion or towards the mode to the side wall motion of wind channel, and sealing state adjusting part can apply the contact pretightning force towards the wind channel side wall to the sealing element under the contact sealing state, and pretightning force is controllable, can avoid appearing the clearance between sealing element and wind channel side wall, can realize better sealed effect. In the scheme of the prior art, the air door of the air valve is sealed when rotating to be abutted against the side wall of the air duct, the air door cannot move towards the direction opposite to the side wall of the air duct, the sealing effect is mainly ensured by the machining precision of the air door, and the air door cannot be adjusted in the working process of a product.
(4) Compared with the air valve structure, the sealing structure is more reliable in structure, can avoid the problem of loosening or blocking, is not easy to fail after long-term use, and can prolong the service life.
(5) The flexible sealing element can also adapt to sealing elements in various conditions such as plane, irregular surface and the like, has strong adaptability and can reduce the requirement on the processing precision of the side wall of the air duct. Moreover, the air duct size of different specifications can be adapted through the change of the state of the flexible sealing element.
For the embodiment that the regular polygon heat exchange core 2 is rotatably arranged, when the heat exchange core 2 rotates to the first position, as shown in fig. 4, a sealing state is formed by contacting the top of the regular polygon with each sealing piece 7 to close the air channel, so that the fresh air inlet air channel and the return air inlet air channel are respectively communicated with the fresh air outlet air channel and the return air outlet air channel through the heat exchange core 2, and the fresh air unit works in a heat exchange mode. When the heat exchange core 2 rotates to the second position, as shown in fig. 1, 2, 5 and 6, the regular polygon sides and the sealing pieces 7 are opposite to each other to generate gaps so as to open the air duct, and air flow can flow through the air duct without passing through the heat exchange core 2 with larger resistance, and the heat exchange core 2 stops working, so that the fresh air handling unit is in a heat exchange release mode.
When the air duct is opened, the air duct can be opened to the maximum extent in a state that the edges of the regular polygon are opposite to the side wall of the air duct, the flow area of air flow in the air duct is increased, and the working efficiency of the fresh air handling unit is optimized. Alternatively, the sides of the regular polygon may also be obliquely opposed to the side walls of the air duct when opening the air duct, so long as a gap is created to open the air duct.
Preferably, the seal 7 is an air bag. The air bag is convenient to open or close the air duct by controlling the inflation amount, the pretightening force of the air bag and the side wall of the air duct in a sealing contact state can be adjusted, the air bag can be in closer contact with the side wall of the air duct, and the air bag has strong adaptability to different shapes of the side wall of the air duct. Alternatively, the seal 7 may be made of rubber or sponge, or the like.
Preferably, the sealing member 7 has a cylindrical structure, and the length of the sealing member 7 is adapted to the width of the air duct so as to achieve a reliable seal in the entire air duct width direction.
By designing the heat exchange core 2 in a movable, preferably rotatable, manner, when the heat exchange core 2 is rotated to the first position shown in fig. 4, the vertices of the heat exchange core 2 are sealed in contact with the sealing member 7, and the fresh air handling unit is operated in the heat exchange mode; when the heat exchange core rotates to the second position shown in fig. 1, 2, 5 and 6, each side of the heat exchange core 2 is out of contact with the sealing member 7, and the fresh air handling unit is in a non-working state. Therefore, the structure can enable the fresh air handling unit to be switched between the heat exchange mode and the non-working state only by changing the position of the heat exchange core body 2 without actively changing the state of the sealing piece 7, and the control is simpler and more reliable.
As shown in fig. 4, the individual seals 7 are uniformly distributed along the circumferential direction of the heat exchange core 2. The seal 7 may be provided on the inner wall of the housing 1 or on the partition 6. The sealing elements 7 uniformly distributed in the circumferential direction can fully utilize the structural characteristics of the regular polygon heat exchange core body 2, the rotation direction of the heat exchange core body 2 is not required to be considered, and under the condition that the number of the regular polygon edges is certain, the heat exchange mode and the heat exchange release mode can be switched by only rotating by a specific angle, so that the control mode can be simplified, and the control reliability of the working mode of the fresh air handling unit can be improved.
Preferably, the apexes of the regular polygon facing the respective sealing members 7 are cut into planes so that the heat exchange core 2 is brought into planar contact in a state of contact with the sealing members 7. This structure can form a more reliable sealing state and also prevent damage to the flexible seal 7 by the apexes of the regular polygon.
In the structure shown in fig. 4, four sealing members 7 are provided, two sealing members 7 are respectively provided on the inner side walls of the partition plates 6 on both sides, and the other two sealing members 7 are respectively provided on the end portions of the intermediate partition plates 6 and the inner side walls of the casing 1, so that the four sealing members can be distributed along the circumferential direction of the heat exchange core 2.
In order to adjust the state of the sealing element 7 so as to enable the fresh air handling unit to realize different functions in a heat exchange release mode, the fresh air handling unit further comprises a sealing state adjusting component arranged in the shell 1 and used for actively adjusting the contact or separation state of the sealing element 7 and the heat exchange core body 2 so as to control the closing, opening and opening degree of the air duct.
In some embodiments, the sealing element 7 is an air bag, and the sealing state adjusting component comprises an inflation and deflation mechanism for adjusting the inflation amount of the air bag so as to realize the inflation or the shrinkage of the air bag, so that the air bag contacts and seals with the heat exchange core body 2 in the inflated state, and the air duct is closed; and in the contracted state, the air duct is separated from the heat exchange core body to open the air duct. Because the arrangement position of the air charging and discharging mechanism has no special requirement, the embodiment is more flexible in structural design, and the requirement on the surrounding of the air duct, particularly the side space, can be reduced.
Further, the fresh air handling unit further includes a control part in which an amount of inflation required for the air bladder and the heat exchange core 2 to be in a sealed state and an amount of inflation required for the air bladder and the heat exchange core 2 to be in a preset gap are stored in advance. The embodiment can automatically adjust the air bag inflation amount to change the state of the air bag so as to control the closing, opening and opening degree of the air duct, thereby realizing different functions of the fresh air handling unit and being simple and convenient to control. Moreover, by adjusting the air charge of the air bag, the heat exchange core 2 can be adapted to different specifications.
In other embodiments, the sealing state adjusting component comprises a linear driving mechanism for driving the sealing element 7 to translate towards the direction approaching the heat exchange core 2 to realize contact sealing, so as to close the air duct; or translates away from the heat exchange core 2 to open the air duct. This embodiment realizes opening and closing of the air duct by adjusting the position of the sealing member 7, and is easy to control. The linear driving mechanism can be an electric push rod, a linear motor, a cylinder or the like. In order to increase the smoothness of the movement of the sealing element 7, an elastic element may also be provided between the sealing element 7 and the stationary base body to increase the damping of the sealing element 7 during movement.
The heat exchange core 2 adopts a regular polygon, and in one embodiment, the number of sides of the regular polygon is an integer multiple of four, such as a quadrangle, an octagon, and the like. The heat exchange core 2 is capable of sealing in contact with the seal 7 with the apex of the regular polygon in a state rotated to the first position. When the mode is required to be switched, the sealing members 7 are separated from the heat exchange core 2, so that the heat exchange core 2 can smoothly rotate. In the state of being rotated to the second position, the sides of the regular polygon are brought into facing relation with the seal 7 and form a gap to be out of the sealed state. The angle difference between the first position and the second position can be calculated by dividing 180 degrees by the number of polygon edges, and the first position and the second position can rotate in the forward direction and the reverse direction.
In the fresh air handling unit of this embodiment, when the seal 7 is to be adjusted to a contact seal state in the heat exchange mode or the heat exchange release mode, the adjustment amounts of the seals 7 are uniform. For example, the sealing member 7 is an air bag, when the heat exchange core 2 is in the second position, as shown in fig. 1, 2, 5 and 6, and different air channels are selectively closed, the air inflation amounts of the air bags in different positions are uniform, so that the control difficulty can be reduced, and the control reliability can be improved.
If the heat exchange core 2 adopts a hexagonal shape, the heat exchange core 2 can make two opposite vertexes and two opposite sides of the hexagonal shape face the sealing member 7 and contact-seal in a state of rotating to the first position, and make a part of the sealing member 7 separate from the heat exchange core 2 in order to separate from the sealing state in a state of rotating to the second position, and the angle difference between the first position and the second position is 30 °.
In a specific embodiment, as shown in fig. 4, four air duct sections 8 are arranged side by side in the casing 1, one side (for example, the upper portion) of the casing 1 and the four air duct sections 8 are sequentially and correspondingly provided with a return air outlet, a fresh air inlet, a fresh air outlet and a return air inlet from left to right, the heat exchange core 2 is in a regular quadrangle, a first sealing member a, a second sealing member b, a third sealing member c and a fourth sealing member d are respectively arranged at the left side, the lower side, the right side and the upper side of the heat exchange core 2, the first sealing member a is arranged at the inner side of the left side partition 6, the second sealing member b is arranged on the inner wall of the bottom of the casing 1, the third sealing member c is arranged at the inner side of the right side partition 6, and the fourth sealing member d is arranged at the end of the middle partition 6.
The fresh air unit further comprises a fresh air fan 4 and an exhaust fan 5, wherein the shell 1 is provided with a fresh air outlet and a return air outlet, the fresh air fan 4 is at least arranged at a position, close to the fresh air outlet, in the fresh air channel, and the exhaust fan 5 is at least arranged at a position, close to the return air outlet, in the return air channel.
The fresh air handling unit can be switched between the following modes:
heat exchange mode: as shown in fig. 4, the heat exchange core 2 rotates to a first position, four vertexes of the regular polygon are respectively in contact seal with sealing pieces 7 at corresponding positions, and both the fresh air fan 4 and the exhaust fan 5 are opened;
non-working state: the heat exchange core body 2 rotates to a second position, the second position is different from the first position by 45 degrees, four sides of the regular polygon are opposite to sealing pieces 7 at corresponding positions and form gaps, and the fresh air fan 4 and the exhaust fan 5 are both closed;
fresh air bypass mode: as shown in fig. 5, the heat exchange core 2 rotates to the second position, only the fourth sealing member d is separated from the sealing state, the fresh air fan 4 is started, and the exhaust fan 5 is closed;
return air bypass mode: the heat exchange core body 2 rotates to a second position, only the second sealing piece b is separated from the sealing state, the fresh air fan 4 is closed, and the exhaust fan 5 is opened;
fresh air return double bypass mode: as shown in fig. 6, the heat exchange core 2 rotates to the second position, only the second sealing member b and the fourth sealing member d are separated from the sealing state, and both the fresh air fan 4 and the exhaust air fan 5 are opened;
internal circulation mode: the heat exchange core body 2 rotates to a second position, only the third sealing piece c is separated from the sealing state, the fresh air fan 4 is started, and the exhaust fan 5 is closed;
fresh air exhaust full-open air mixing mode: the heat exchange core body 2 rotates to a second position, only the third sealing piece c and the fourth sealing piece d are separated from the sealing state, all the air channels are opened, the fresh air fan 4 is opened, and the exhaust fan 5 is closed; or alternatively
Fresh air exhaust proportion adjustment air mixing mode: as shown in fig. 2, the heat exchange core 2 rotates to the second position, only the third sealing member c and the fourth sealing member d are separated from the sealing state, the air duct is opened according to the proportion of mixed air, the fresh air fan 4 is opened, and the exhaust fan 5 is closed.
The following describes the control process of the fresh air component by taking the embodiment shown in fig. 1 to 6 as an example and combining the control method of the fresh air component of the application as follows:
the fresh air unit is in an initial state shown in fig. 1 before starting, the fresh air unit automatically enters a fresh air exhausting and mixing mode shown in fig. 2 (the third sealing element c and the fourth sealing element d deflate and shrink to 1/2 at the moment), and after the fresh air unit is normally started, the corresponding working mode is automatically selected according to the following principle, wherein the indoor and outdoor air state parameters are detected and read by related sensors arranged on the fresh air unit.
When the outdoor fresh air temperature Tw is judged to be less than or equal to the winter working condition critical temperature Tx or the outdoor fresh air temperature Tw is judged to be more than or equal to the summer working condition critical temperature Ts, the fresh air unit automatically enters the heat exchange as shown in figure 4The mode is changed, at the moment, the heat exchange core body 2 rotates 45 degrees through the driving mechanism 3, the heat exchange core body 2 enters a working state, and fresh air and exhaust air exchange heat; when indoor CO 2 Concentration Mco 2 The content of CO is less than or equal to preset 2 Concentration M 1 When the air valve 9 is slowly opened, part of return air in the return air inlet air duct is led into the fresh air outlet air duct until the indoor CO 2 Concentration Mco 2 Preset CO 2 Concentration M 1 At the time, the damper 9 is closed to stop the drainage, and then the indoor CO is detected in real time 2 Concentration Mco 2 Repeating the steps;
judging that the critical temperature Tx of the working condition in winter is less than the critical temperature Ts of the working condition in summer and the concentration value M of the PM2.5 in the outdoor PM2.5 The concentration M of PM2.5 is less than or equal to preset 2 When the fresh air unit automatically enters a fresh air bypass mode shown in fig. 5, at the moment, the heat exchange core body 2 rotates to the second position, the fourth sealing piece d contracts to the minimum, the fresh air fan 4 is started, the air exhaust fan 5 is closed, indoor air exhaust is performed through gaps such as doors and windows, natural air exhaust is performed, the air exhaust fan 5 is not started, and energy is saved;
judging that the critical temperature Tx of the working condition in winter is less than the critical temperature Ts of the working condition in summer and the concentration value M of the PM2.5 in the outdoor PM2.5 > preset PM2.5 concentration M 2 And when the fresh air unit automatically enters a fresh air return double-bypass mode shown in fig. 6, the second sealing piece b and the fourth sealing piece d shrink, the fresh air fan 4 and the exhaust fan 5 are fully opened, the door and window are closed, the fresh air unit runs in full fresh air, and the exhaust fan bears indoor exhaust.
The above-described examples are provided to illustrate embodiments of the present application in detail, but the present application is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, equivalents, and variations can be made to these embodiments without departing from the principles and spirit of the application.

Claims (20)

1. A fresh air handling unit, comprising:
a plurality of partition boards (6) are arranged in the shell (1) and used for dividing the space in the shell (1) into four side-by-side air duct sections (8), wherein two air duct sections (8) respectively form a fresh air inlet air duct and a fresh air outlet air duct, and the other two air duct sections (8) respectively form a return air inlet air duct and a return air outlet air duct;
the heat exchange core body (2) is movably arranged in the middle two air duct sections (8) and is used for enabling the fresh air inlet air duct and the return air inlet air duct to be respectively communicated with the fresh air outlet air duct and the return air outlet air duct through the heat exchange core body (2) in a state of moving to a first position so as to enable the fresh air unit to work in a heat exchange mode; and in a state of moving to the second position, stopping the heat exchange core (2) so as to enable the fresh air handling unit to be in a heat exchange release mode; and
and the air valve (9) is arranged between the return air inlet air duct and the fresh air outlet air duct and is used for guiding part of return air in the return air inlet air duct into the fresh air outlet air duct when the air valve is opened in a heat exchange mode.
2. Fresh air handling unit according to claim 1, characterized in that the heat exchange core (2) is rotatably arranged.
3. Fresh air handling unit according to claim 2, characterized in that the heat exchange core (2) is rotatably arranged with its own geometrical centre as axis.
4. Fresh air handling unit according to claim 1, wherein the fresh air outlet duct is adjacent to the return air inlet duct, and the damper (9) is arranged on the partition (6) between the fresh air outlet duct and the return air inlet duct.
5. Fresh air handling unit according to claim 1, characterized in that one of the sides of the housing (1) is provided with a return air outlet, a fresh air inlet, a fresh air outlet and a return air inlet side by side.
6. Fresh air handling unit according to claim 1, characterized in that the heat exchange core (2) has a regular polygon shape.
7. The fresh air handling unit according to claim 1, further comprising a plurality of flexible sealing members (7), wherein the heat exchange core (2) is capable of sealing by contact with each of the sealing members (7) in a state of being moved to a first position, such that the fresh air intake duct and the return air intake duct are each respectively in communication with the fresh air outlet duct and the return air outlet duct through the heat exchange core (2); and in the state of moving to the second position, the heat exchange core (2) is stopped by being separated from the sealing state of at least part of the sealing piece (7).
8. Fresh air handling unit according to claim 7, wherein each seal (7) is evenly distributed along the circumference of the heat exchange core (2).
9. The fresh air handling unit according to claim 7, wherein the heat exchange core (2) is rotatably disposed, the heat exchange core (2) has a regular polygon shape, and when the heat exchange core (2) is rotated to the first position, a vertex of the regular polygon is sealed in contact with the sealing member (7), and when the heat exchange core is rotated to the second position, a side of the regular polygon is directly opposite to the sealing member (7) to generate a gap.
10. Fresh air handling unit according to claim 7, characterized in that the seal (7) is an air bag.
11. The fresh air handling unit according to claim 7, further comprising a sealing state adjusting means provided in the housing (1) for actively adjusting a sealing state between the sealing member (7) and the heat exchange core (2).
12. The fresh air handling unit according to claim 11, wherein the sealing member (7) is an air bag, and the sealing state adjusting means includes an inflation/deflation mechanism for adjusting an inflation amount of the air bag to achieve inflation or deflation of the air bag.
13. The fresh air handling unit according to claim 12, further comprising a control means in which the amount of inflation required for the sealing between the air bag and the heat exchange core (2) and the amount of inflation required for maintaining a predetermined gap between the air bag and the heat exchange core (2) are stored in advance.
14. Fresh air handling unit according to claim 11, wherein the sealing-state adjusting means comprises a linear driving mechanism for driving the translation of the sealing member (7) towards or away from the heat exchange core (2).
15. A fresh air handling unit control method based on a fresh air handling unit according to any one of claims 1 to 14, comprising:
a heat exchange mode switching step: when the outdoor fresh air temperature Tw is less than or equal to the winter working condition critical temperature Tx or the outdoor fresh air temperature Tw is more than or equal to the summer working condition critical temperature Ts, the fresh air unit is enabled to work in a heat exchange mode of fresh air and return air heat exchange;
and (3) drainage: in the heat exchange mode, whenever indoor CO 2 Concentration Mco 2 The content of CO is less than or equal to preset 2 Concentration M 1 When the air conditioner is in operation, part of return air in the return air inlet air duct is led into the fresh air outlet air duct until the indoor CO 2 Concentration Mco 2 Preset CO 2 Concentration M 1 And stopping drainage when the water is stopped.
16. The method of claim 15, wherein the flow rate of the portion of the return air from the return air inlet duct to the fresh air outlet duct is gradually increased before the flow is stopped.
17. The fresh air handling unit control method of the fresh air handling unit according to claim 15, further comprising:
and a fresh air bypass mode switching step: when the critical temperature Tx of the working condition in winter is less than the critical temperature Tx of the fresh air in the outdoor, the critical temperature Ts of the working condition in summer is less than the concentration value M of the PM2.5 in the outdoor PM2.5 The concentration M of PM2.5 is less than or equal to preset 2 And when the fresh air fan is started, the exhaust fan is closed, and the fresh air unit works in a fresh air bypass mode.
18. The fresh air handling unit control method of the fresh air handling unit according to claim 15, further comprising:
a double bypass mode switching step: when the critical temperature Tx of the working condition in winter is less than the critical temperature Tx of the fresh air in the outdoor, the critical temperature Ts of the working condition in summer is less than the concentration value M of the PM2.5 in the outdoor PM2.5 > preset PM2.5 concentration M 2 And when the fresh air fan and the exhaust fan are started, the fresh air unit works in a fresh air return double bypass mode.
19. The fresh air handling unit control method of the fresh air handling unit according to claim 15, further comprising:
and a fresh air exhaust and air mixing mode switching step: after the machine is started, the fresh air fan is started, the exhaust fan is closed, and the fresh air unit works in a fresh air exhaust and air mixing mode.
20. The method for controlling a fresh air handling unit of a fresh air handling unit according to claim 19, wherein in the fresh air exhaust air mixing mode, a mixing ratio of fresh air and return air is 1:1.
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CN113251592A (en) * 2020-02-12 2021-08-13 青岛海尔空调电子有限公司 Operation control method of total-heat fresh air machine
CN114234373B (en) * 2021-12-16 2022-12-13 珠海格力电器股份有限公司 Control method and device of fresh air environmental control unit and fresh air environmental control unit
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