CN110701691B - Fresh air unit and control method - Google Patents

Fresh air unit and control method Download PDF

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Publication number
CN110701691B
CN110701691B CN201910971678.7A CN201910971678A CN110701691B CN 110701691 B CN110701691 B CN 110701691B CN 201910971678 A CN201910971678 A CN 201910971678A CN 110701691 B CN110701691 B CN 110701691B
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China
Prior art keywords
air
water
inlet
outlet
temperature
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CN201910971678.7A
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CN110701691A (en
Inventor
张龙爱
王传华
唐育辉
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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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
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/044—Systems in which all treatment is given in the central station, i.e. all-air 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
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • 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
    • F24F11/88—Electrical aspects, e.g. circuits
    • 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
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
    • 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
    • F24F7/007—Ventilation with forced flow
    • 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
    • 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
    • F24F2110/20—Humidity

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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)
  • Air Conditioning Control Device (AREA)
  • Drying Of Gases (AREA)

Abstract

The application relates to a fresh air unit and a control method, and belongs to the technical field of fresh air equipment. The application comprises the following steps: the inlet of the water meter cooler is connected with the outlet of the cold water source; the water inlet side of the water-cooled condenser is provided with a first flow path and a second flow path which are connected in parallel, the water inlet of the water-cooled condenser is connected with the outlet of the water meter cooler through the first flow path, and the water inlet of the water-cooled condenser is also connected with the outlet of the cold water source through the second flow path. Through this application, can adjust the heat exchange water that obtains the water-cooling condenser with the heat that water surface cooler and air inlet heat exchange obtained, help realizing single cold water supply to help reduce cost, reduce the energy consumption, promote the efficiency.

Description

Fresh air unit and control method
Technical Field
The application belongs to the technical field of fresh air equipment, and particularly relates to a fresh air handling unit and a control method.
Background
In the related art, some fresh air handling units have the functions of dehumidifying and regulating temperature, and the processing process is as follows: after entering from the air inlet of the fresh air machine set, the outdoor fresh air is primarily cooled and dehumidified through a water meter cooler, secondarily cooled and dehumidified through an evaporator, then heated through an air-cooled condenser, and finally sent into a room through an air supply fan. In the related specific application, in order to obtain better temperature regulation effect, the evaporator also provides a refrigerant through the water-cooled condenser, the water-cooled condenser needs water to exchange heat with the refrigerant in the water-cooled condenser to control the refrigerant, the water-cooled condenser uses water to primarily cool and dehumidify the inlet air, so that the water-cooled condenser and the water-cooled condenser have different requirements on water temperature, in practical application, the water-cooled condenser and the water-cooled condenser supply water through different cold water sources, for example, the water-cooled condenser supplies water, because the water-cooled condenser needs to control the refrigerant, the water-cooled condenser supplies the required heat exchange water through specially configuring a cooling tower as a cold water source, and the cooling tower controls the heat exchange water supplied to the water-cooled condenser to control the refrigerant in the water-cooled condenser.
Under the condition that the water meter cooler and the water cooling condenser supply water through different cold water sources respectively, the problems are that: the water-cooled condenser and the water-cooled condenser respectively use different cold water sources for water supply, so that on one hand, the cost investment is increased, and on the other hand, the water-cooled condenser independently uses the cold water sources for water supply, but in the running process of the fresh air unit, the energy consumption of the cooling tower is still very high.
Therefore, the energy efficiency of the fresh air handling unit still needs to be improved.
Disclosure of Invention
In order to overcome the problems in the related art to at least a certain extent, the application provides a fresh air handling unit and a control method, so that heat acquired by heat exchange between a water meter cooler and an air inlet is utilized to regulate heat exchange water for obtaining a water-cooled condenser, and the fresh air handling unit and the control method are beneficial to reducing energy consumption, reducing cost and improving energy efficiency.
In order to achieve the above purpose, the present application adopts the following technical scheme:
in a first aspect of the present invention,
the application provides a fresh air handling unit, include:
the inlet of the water meter cooler is connected with the outlet of the cold water source;
the water inlet side of the water-cooling condenser is provided with a first flow path and a second flow path which are connected in parallel, the water inlet of the water-cooling condenser is connected with the outlet of the water meter cooler through the first flow path, and the water inlet of the water-cooling condenser is also connected with the outlet of the cold water source through the second flow path.
Further, the fresh air handling unit further includes:
the first flow regulating valve is arranged on the inlet side flow path of the water meter cooler and is used for regulating the flow rate of the cold water supplied by the cold water source to the water meter cooler.
Further, the fresh air handling unit further includes:
the second flow regulating valve is arranged on the second flow path and used for regulating the flow rate of the cold water directly supplied to the water-cooled condenser by the cold water source.
Further, the fresh air handling unit further includes:
the evaporator is arranged on the air outlet side of the water meter cooler, and the inlet of the evaporator is connected with the refrigerant outlet of the water-cooling condenser;
the first throttle valve is arranged on the side flow of the refrigerant outlet of the water-cooled condenser.
Further, the fresh air handling unit further includes:
the air-cooled condenser is arranged on the air outlet side of the evaporator, and the inlet of the evaporator is also connected with the outlet of the air-cooled condenser;
and the second throttle valve is arranged on the outlet side flow of the air-cooled condenser.
Further, the fresh air handling unit further includes:
the outlet of the compressor is connected with the refrigerant inlet of the water-cooled condenser and the inlet of the air-cooled condenser respectively, and the inlet of the compressor is connected with the outlet of the evaporator.
Further, the fresh air handling unit further includes:
the fan is used for enabling the fresh air unit to form air inlet and sequentially passes through the water meter cooler, the evaporator and the air cooling condenser.
Further, the fan is arranged on the air outlet side of the air-cooled condenser.
Further, the fresh air handling unit further includes:
and a check valve provided in the first flow path.
Further, the fresh air handling unit further includes:
and the water inlet side of the water-cooled condenser is connected with the first flow path and the second flow path through the water mixing valve.
In a second aspect of the present invention,
the application provides a fresh air handling unit control method, which is applied to the related fresh air handling unit, and comprises the following steps:
acquiring the air inlet temperature and the air inlet humidity of the air inlet side of the fresh air unit;
determining whether the inlet air temperature and the inlet air humidity meet the outlet air control requirement;
if the air temperature and the air humidity do not meet the requirements, the water inlet of the water-cooled condenser is selectively controlled, and the refrigerants supplied to the evaporator by the water-cooled condenser and the air-cooled condenser are respectively controlled, so that the air outlet temperature and the air outlet humidity of the fresh air unit meet the air outlet control requirements.
Further, the selectively controlling the water inlet of the water-cooled condenser according to the air inlet temperature and the air inlet humidity, and controlling the refrigerants supplied to the evaporator by the water-cooled condenser and the air-cooled condenser respectively, so that the air outlet temperature and the air outlet humidity of the fresh air unit meet the air outlet control requirement, including:
determining whether the first flow regulating valve needs to be opened according to the relation between the air inlet temperature and a preset air inlet threshold temperature;
and according to a determined result, executing a control operation matched with the air outlet temperature and the air outlet rheumatism of the fresh air unit, and then controlling one or more of the first throttle valve, the second throttle valve and the second flow regulating valve to enable the air outlet temperature and the air outlet rheumatism of the fresh air unit to meet the air outlet control requirement.
Further, the determining whether the first flow regulating valve needs to be opened according to the relation between the air inlet temperature and the preset air inlet threshold temperature includes:
if the air inlet temperature is greater than the preset air inlet threshold temperature, determining that the first flow regulating valve needs to be opened;
and if the inlet air temperature is less than or equal to the preset inlet air threshold temperature, determining that the first flow regulating valve is not required to be opened.
Further, according to the determination result, performing a control operation matched with the determination result, and then controlling one or more of the first throttle valve, the second throttle valve and the second flow regulating valve, so that the air outlet temperature and the air outlet rheumatism of the fresh air handling unit meet the air outlet control requirement, including:
opening the first flow regulating valve if it is determined that the first flow regulating valve needs to be opened;
acquiring the superheat degree of the fresh air unit, and according to the air inlet temperature and the air inlet humidity, adjusting the opening of the first throttle valve and the second throttle valve in combination with the superheat degree, and simultaneously acquiring the condensing pressure of the water-cooled condenser;
and judging whether the second flow regulating valve is further opened to perform common control according to the relation between the condensing pressure and the preset condensing threshold pressure, so that the air outlet temperature and the air outlet rheumatism degree of the fresh air unit meet the air outlet control requirement.
Further, the determining whether to further open the second flow regulating valve to perform common control according to the relationship between the condensation pressure and the preset condensation threshold pressure, so that the air outlet temperature and the air outlet rheumatism of the fresh air unit meet the air outlet control requirement includes:
if the condensing pressure is greater than the preset condensing threshold pressure, opening the second flow regulating valve, and regulating the first throttle valve, the second throttle valve and the second flow regulating valve according to the air inlet temperature and the air inlet humidity and combining the superheat degree and the condensing pressure to ensure that the air outlet temperature and the air outlet rheumatism degree of the fresh air unit meet the air outlet control requirement; or alternatively, the process may be performed,
if the condensing pressure is smaller than or equal to the preset condensing threshold pressure, the second flow regulating valve is kept closed, and the first throttling valve and the second throttling valve are regulated according to the air inlet temperature and the air inlet humidity and the superheat degree, so that the air outlet temperature and the air outlet rheumatism degree of the fresh air unit meet the air outlet control requirement.
Further, according to the determination result, performing a control operation matched with the determination result, and then controlling one or more of the first throttle valve, the second throttle valve and the second flow regulating valve, so that the air outlet temperature and the air outlet rheumatism of the fresh air handling unit meet the air outlet control requirement, including:
if the first flow regulating valve is determined not to be required to be opened, the first flow regulating valve is kept closed, the second flow regulating valve is opened, and then the first throttling valve and the second throttling valve are regulated according to the air inlet temperature and the air inlet humidity, so that the air outlet temperature and the air outlet humidity of the fresh air unit meet the air outlet control requirement.
Further, the method further comprises:
and if the inlet air temperature and the inlet air humidity meet the outlet air control requirement, controlling the fresh air unit to only form inlet air, and not performing temperature and humidity control treatment on the inlet air.
In a third aspect of the present invention,
the application provides a fresh air handling unit, include:
a memory having an executable program stored thereon;
and a processor for executing the executable program in the memory to implement the steps of the method described above in relation thereto.
The application adopts the technical scheme, possesses following beneficial effect at least:
the water-cooling condenser water supply control device can mix water discharged by the water meter cooler with water discharged by the cold water source, provide the water-cooling condenser with water discharged by the cold water source, realize that heat obtained by utilizing the water meter cooler and air inlet heat exchange is used for adjusting heat exchange water for obtaining the water-cooling condenser, further realize that a cooling tower is replaced for adjusting water supply for the water-cooling condenser, be favorable for realizing water supply of a single cold water source, be favorable for reducing cost, reducing energy consumption and improving energy efficiency.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a fresh air handling unit according to an embodiment of the present disclosure;
fig. 2 is a flow chart of a fresh air handling unit control method according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a fresh air handling unit according to another embodiment of the present disclosure.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail below. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, based on the examples herein, which are within the scope of the protection sought by those of ordinary skill in the art without undue effort, are intended to be encompassed by the present application.
Fig. 1 is a schematic structural diagram of a fresh air handling unit according to an embodiment of the present application, as shown in fig. 1, the fresh air handling unit 1 includes:
the water meter cooler 101, the inlet of the water meter cooler 101 is connected with the outlet of the cold water source 2;
the water cooling condenser 102, the water inlet side of the water cooling condenser 102 is formed with a first flow path and a second flow path which are connected in parallel, the water inlet of the water cooling condenser 102 is connected with the outlet of the water meter cooler 101 through the first flow path, and the water inlet of the water cooling condenser 102 is also connected with the outlet of the cold water source 2 through the second flow path.
Specifically, through the above embodiment, water supply through the single cold water source 2 can be realized, so as to meet respective water inlet demands of the water meter cooler 101 and the water cooling condenser 102, and simultaneously, energy consumption can be reduced, and energy efficiency can be improved. The cold water source 2 supplies water to the water meter cooler 101, after the water supplied by the cold water source 2 enters the water meter cooler 101, the water meter cooler 101 can primarily cool and dehumidify the inlet air, heat in the inlet air is absorbed, and the water from the water meter cooler 101 and the cold water source 2 are directly supplied to the water-cooled condenser 102 for mixing and are supplied to the water-cooled condenser 102. The water discharged from the water meter cooler 101 is mixed with the water discharged from the cold water source 2 and is supplied to the water-cooled condenser 102 for use, so that the heat acquired by heat exchange between the water meter cooler 101 and the air inlet is utilized to adjust the heat exchange water for obtaining the water-cooled condenser 102, and further, the effect of replacing a cooling tower to adjust the water supply of the water-cooled condenser 102 can be achieved, and therefore, by the scheme of the embodiment, the water supply of the single cold water source 2 can be achieved, the cost is reduced, the energy consumption is reduced, and the energy efficiency is improved.
As shown in fig. 1, in one embodiment, the fresh air handling unit 1 further includes:
a first flow rate adjusting valve 103, disposed on an inlet side flow path of the water cooler 101, for adjusting a flow rate of water supplied from the cold water source 2 to the water cooler 101.
Specifically, the on-off of the first flow regulating valve 103 is controlled, so that whether the inlet air needs to be pre-cooled and dehumidified can be controlled.
A second flow rate adjusting valve 104, disposed on the second flow path, for adjusting the flow rate of water supplied directly from the cold water source 2 to the water-cooled condenser 102.
Specifically, when the first flow regulating valve 103 and the second flow regulating valve 104 are both opened, water entering the water inlet of the water-cooled condenser 102 is a mixture of water exiting from the first flow path and water exiting from the second flow path, wherein the water exiting from the first flow path is directly provided by the water-cooled condenser 101, and after the water exiting from the water-cooled source 2 enters the water-cooled condenser 101, the water-cooled condenser 101 can primarily cool and dehumidify the air and absorb heat in the air, so that after the water exiting from the first flow path and the second flow path is mixed, the water is regulated, for example, the water-cooled source 2 can be groundwater, and has stable low temperature, and the heat acquired by heat exchange between the water-cooled condenser 101 and the air entering is utilized to regulate the heat exchange water of the water-cooled condenser 102, so that the water supply regulation of the water-cooled condenser 102 can be realized.
As shown in fig. 1, in one embodiment, the fresh air handling unit 1 further includes:
a check valve 105 is provided in the first flow path.
Specifically, the check valve 105 is provided in the first flow path, so that water is prevented from flowing backward from the water outlet of the water meter cooler 101.
As shown in fig. 1, in one embodiment, the fresh air handling unit 1 further includes:
and a water mixing valve 106, wherein the water inlet side of the water-cooled condenser 102 is connected to the first flow path and the second flow path through the water mixing valve 106.
Specifically, water flowing out of the water outlet of the water meter cooler 101 enters the water mixing valve 106 through a first flow path, and a part of water supplied by the cold water source 2 enters the water mixing valve 106 through a second flow path, and the water coming out of the water mixing valve 106 is mixed by two paths of water, so that the water is regulated, and then the water is supplied to the water cooling condenser 102 for heat exchange.
As shown in fig. 1, in one embodiment, the fresh air handling unit 1 further includes:
an evaporator 107 disposed on the air outlet side of the water cooler 101, wherein an inlet of the evaporator 107 is connected to a refrigerant outlet of the water-cooled condenser 102;
the first throttle valve 110 is provided in the refrigerant outlet side flow path of the water-cooled condenser 102.
Specifically, the water-cooled condenser 102 and the evaporator 107 form a refrigerant flow path, the evaporator 107 is disposed on the air outlet side of the water-cooled condenser 101, the air passes through the water-cooled condenser 101, and then the air passes through the evaporator 107, the air passing through the evaporator 107 is subjected to secondary cooling and dehumidification, and the air discharged is dry and cold air, and the refrigerant supplied to the evaporator 107 from the water-cooled condenser 102 can be regulated and controlled by the first throttle valve 110.
As shown in fig. 1, in one embodiment, the fresh air handling unit 1 further includes:
an air-cooled condenser 108 disposed at an air outlet side of the evaporator 107, wherein an inlet of the evaporator 107 is also connected with an outlet of the air-cooled condenser 108;
the second throttle valve 111 is provided in the outlet-side flow path of the air-cooled condenser 108.
Specifically, the evaporator 107 and the air-cooled condenser 108 also form a refrigerant flow path, and the evaporator 107 is used for receiving the refrigerant of the air-cooled condenser 108, so that an additional evaporator 107 is not required to be separately configured for the air-cooled condenser 108. The air-cooled condenser 108 is provided on the air outlet side of the evaporator 107, and after the air passes through the evaporator 107, dry and cool air is formed, the temperature is further reduced, and the heat released by the condensation performed by the air-cooled condenser 108 is released when the air passes through the air-cooled condenser 108, and the dry and cool air is warmed to obtain warmed dry air, which is supplied to the room. The refrigerant supplied from the air-cooled condenser 108 to the evaporator 107 can be controlled by the second throttle valve 111.
In practical applications, the degree of contribution of both the water-cooled condenser 102 and the air-cooled condenser 108 to the cooling and dehumidification of the evaporator 107 can be adjusted by the cooperation of the first throttle valve 110 and the second throttle valve 111.
As shown in fig. 1, in one embodiment, the fresh air handling unit 1 further includes:
and a compressor 109, wherein an outlet of the compressor 109 is connected with a refrigerant inlet of the water-cooled condenser 102 and an inlet of the air-cooled condenser 108, and an inlet of the compressor 109 is connected with an outlet of the evaporator 107.
Specifically, the water-cooled condenser 102 and the air-cooled condenser 108 form a parallel refrigerant flow path, the refrigerant supplied from the compressor 109 is split into two parts, one part of the refrigerant enters the water-cooled condenser 102 to exchange heat with water and then enters the evaporator 107, the other part of the refrigerant enters the air-cooled condenser 108 to exchange heat with passing wind, the passing wind is heated and then enters the evaporator 107, the refrigerant entering the evaporator 107 is sourced from two places, and the dehumidification capability is enhanced.
As shown in fig. 1, in one embodiment, the fresh air handling unit 1 further includes:
and a fan 112, configured to make the fresh air handling unit 1 form an air intake, and sequentially pass through the water meter cooler 101, the evaporator 107, and the air-cooled condenser 108.
Further, the fan 112 is disposed on the air outlet side of the air-cooled condenser 108.
Specifically, as shown in fig. 1, the arrow shown in fig. 1 indicates the air intake direction, and the air intake can be formed by the fan 112, so that the air intake sequentially passes through the water cooler 101 and the evaporator 107 for cooling and dehumidifying to obtain dry cold air, and then passes through the air-cooled condenser 108 for heating to obtain the dry air with an elevated temperature, and then is sent into a room to meet the dehumidification and temperature regulation requirements of users.
As is clear from the above description of the respective hardware of the fresh air handling unit 1, the water for heat exchange in the water-cooled condenser 102 is adjusted by the heat obtained by heat exchange between the water-cooled condenser 101 and the intake air by using the single cold water source 2 for water supply, so that the energy efficiency can be improved. Corresponding to how to obtain better energy efficiency improving effect by using the single cold water source 2, the application also provides a control method applied to the related fresh air handling unit 1.
As shown in fig. 2, fig. 2 is a flow chart of a fresh air handling unit control method according to an embodiment of the present application, where the fresh air handling unit control method includes the following steps:
step S201, acquiring the air inlet temperature and the air inlet humidity of the air inlet side of the fresh air handling unit 1.
Specifically, a temperature sensor and a humidity sensor can be arranged at the air inlet of the air inlet side of the fresh air unit 1 to detect and acquire the air inlet temperature and the air inlet humidity.
Step S202, determining whether the inlet air temperature and the inlet air humidity meet the outlet air control requirement.
Specifically, in one embodiment, for example, the air outlet control requirement may be: t (T) SO -a≤T≤T SO +a, and D is less than or equal to D SO Wherein T represents temperature, T SO The air supply target temperature, a, the allowable temperature deviation, D, the humidity and D SO Indicating the target humidity of the air supply.
For example, the inlet air temperature is T x The humidity of the inlet air is D x In a practical environment, if T SO -a≤T x ≤T SO +a, and D x ≤D SO The outdoor environment temperature and humidity directly meet the air outlet control requirement of the fresh air machine, and the air inlet is not required to be cooled, dehumidified and temperature-improved. And when one of the temperature and humidity in the air outlet control requirements cannot reach the target condition, the air outlet control requirements are not met, and the air inlet needs to be cooled, dehumidified and the temperature is controlled to be improved.
Step S203, if not, selectively controlling the inlet water of the water-cooled condenser 102 according to the inlet air temperature and the inlet air humidity, and controlling the refrigerants supplied to the evaporator 107 by the water-cooled condenser 102 and the air-cooled condenser 108 respectively, so that the outlet air temperature and the outlet air humidity of the fresh air handling unit 1 meet the outlet air control requirement.
Specifically, the water supply to the water-cooled condenser 102 may be selectively controlled by supplying water to the water-cooled condenser 102 through the first flow path only by the water-meter cooler 101, or by supplying water to the water-cooled condenser 102 through the second flow path only by the cold water source 2, or by supplying both water simultaneously, and then supplying the water to the water-cooled condenser 102 after mixing. The three water supply conditions can be determined according to the specific conditions of the inlet air temperature and the inlet air humidity, and will be described in detail below.
In one embodiment, selectively controlling the water inlet of the water-cooled condenser 102 according to the inlet air temperature and the inlet air humidity, and controlling the refrigerants supplied to the evaporator 107 by the water-cooled condenser 102 and the air-cooled condenser 108 respectively, so that the outlet air temperature and the outlet air humidity of the fresh air handling unit 1 meet the outlet air control requirement, includes:
determining whether the first flow regulating valve 103 needs to be opened according to the relation between the air inlet temperature and a preset air inlet threshold temperature;
according to the determination result, a control operation matched with the air-conditioning system is performed, and then one or more of the first throttle valve 110, the second throttle valve 111 and the second flow regulating valve 104 is/are controlled, so that the air-out temperature and the air-out rheumatism of the fresh air handling unit 1 meet the air-out control requirement.
Specifically, in the initial state, the first flow rate adjusting valve 103, the second flow rate adjusting valve 104, the first throttle valve 110 and the second throttle valve 111 are all in an unopened state, and after determining whether the intake air temperature and the intake air humidity meet the requirement of the exhaust air control, the corresponding control is performed.
The purpose of determining whether the first flow rate adjustment valve 103 needs to be opened is to determine whether pre-cooling and dehumidifying of the intake air are needed, if the first flow rate adjustment valve 103 needs to be opened, this indicates that pre-cooling and dehumidifying of the intake air are needed, and if the first flow rate adjustment valve 103 does not need to be opened, this indicates that pre-cooling and dehumidifying of the intake air are not needed.
For example, the preset inlet air threshold temperature is T xa When the air inlet temperature T x ＞T xa When it is determined that the first flow rate regulating valve 103 needs to be opened, when T x ≤T xa When it is determined that the first flow rate adjustment valve 103 does not need to be opened. According to the determination result, the control operation matched with the determination result is performed as follows: when the air inlet temperature T x ＞T xa At the time of opening the first flow rate regulating valve 103, when T x ≤T xa When this is the case, the first flow rate adjustment valve 103 is kept closed, and the second flow rate adjustment valve 104 is opened.
Then, on the basis that the first flow rate regulating valve 103 is opened or not, one or more of the first throttle valve 110, the second throttle valve 111 and the second flow rate regulating valve 104 are controlled so that the air outlet temperature and the air outlet humidity of the fresh air handling unit 1 meet the air outlet control requirement.
In one embodiment, the performing a control operation matched with the determination result according to the determination result, and then controlling one or more of the first throttle valve 110, the second throttle valve 111 and the second flow rate adjusting valve 104 to make the air outlet temperature and the air outlet humidity of the fresh air handling unit 1 meet the air outlet control requirement includes:
opening the first flow rate adjustment valve 103 if it is determined that the first flow rate adjustment valve 103 needs to be opened;
acquiring the degree of superheat of the fresh air handling unit 1, and according to the air inlet temperature and the air inlet humidity, adjusting the opening degrees of the first throttle valve 110 and the second throttle valve 111 and simultaneously acquiring the condensing pressure of the water-cooled condenser 102 in combination with the degree of superheat;
and judging whether the second flow regulating valve 104 is further opened to perform common control according to the relation between the condensation pressure and the preset condensation threshold pressure, so that the air outlet temperature and the air outlet rheumatism degree of the fresh air handling unit 1 meet the air outlet control requirement.
Specifically, when the inlet air temperature T x ＞T xa When the temperature of the inlet air is higher, the inlet air needs to be pre-cooled and dehumidified firstly, after the first flow regulating valve 103 is opened, the cold water source 2 supplies water to the water meter cooler 101, after the water supplied by the cold water source 2 enters the water meter cooler 101, the water meter cooler 101 can be enabled to perform preliminary cooling and dehumidification on the inlet air, heat in the inlet air is absorbed, the water coming out of the water meter cooler 101 enters the water-cooled condenser 102 and exchanges heat with a refrigerant in the water-cooled condenser 102, in the heat exchange process, the superheat degree of the fresh air unit 1 is obtained for ensuring the performance and the reliability of the unit, and the opening degree of the first throttle valve 110 and the second throttle valve 111 is regulated according to the inlet air temperature and the inlet air humidity in combination with the superheat degree, so that the air supply temperature, the air supply humidity and the superheat degree of the unit are regulated. In the process of adjusting the opening degrees of the first throttle valve 110 and the second throttle valve 111, the condensing pressure of the water-cooled condenser 102 is simultaneously obtained toWhether the condensing pressure of the water-cooled condenser 102 is higher or not is monitored, and whether the second flow regulating valve 104 is further opened or not is further judged to perform common control, so that the air outlet temperature and the air outlet rheumatism degree of the fresh air unit 1 meet the air outlet control requirement.
In one embodiment, the determining whether to further open the second flow rate adjustment valve 104 to perform the common control according to the relationship between the condensation pressure and the preset condensation threshold pressure, so that the air outlet temperature and the air outlet humidity of the fresh air handling unit 1 meet the air outlet control requirement includes:
if the condensation pressure is greater than the preset condensation threshold pressure, the second flow regulating valve 104 is opened, and the first throttle valve 110, the second throttle valve 111 and the second flow regulating valve 104 are regulated according to the air inlet temperature and the air inlet humidity and in combination with the superheat degree and the condensation pressure, so that the air outlet temperature and the air outlet rheumatism degree of the fresh air handling unit 1 meet the air outlet control requirement.
Specifically, if the condensation pressure is greater than the preset condensation threshold pressure, it indicates that the condensation pressure of the water-cooled condenser 102 is higher, and in order to ensure the performance and reliability of the unit, the condensation pressure reduction control needs to be performed simultaneously, in this case, the second flow regulating valve 104 is opened to mix the water coming out of the water meter cooler 101 with the water directly supplied by the cold water source 2, so as to regulate the water supplied to the water-cooled condenser 102, increase the water flow and reduce the cooling water temperature, reduce the condensation pressure, and regulate the first throttle valve 110, the second throttle valve 111 and the second flow regulating valve 104 according to the intake air temperature and the intake air humidity, in combination with the superheat degree and the condensation pressure, so that the air outlet temperature and the air outlet degree of the fresh air unit 1 meet the air outlet control requirement.
Or if the condensation pressure is less than or equal to the preset condensation threshold pressure, keeping the second flow regulating valve 104 closed, and according to the air inlet temperature and the air inlet humidity, combining the superheat degree, regulating the first throttle valve 110 and the second throttle valve 111 to enable the air outlet temperature and the air outlet humidity of the fresh air handling unit 1 to meet the air outlet control requirement.
Specifically, if the condensation pressure is less than or equal to the preset condensation threshold pressure, it indicates that the condensation pressure of the water-cooled condenser 102 is normal, in this case, the second flow rate adjusting valve 104 is not required to be opened, and only the first throttle valve 110 and the second throttle valve 111 are required to be adjusted according to the intake air temperature and the intake air humidity in combination with the superheat degree, so that the exhaust air temperature and the exhaust air humidity of the fresh air handling unit 1 meet the exhaust air control requirement.
In one embodiment, the performing a control operation matched with the determination result according to the determination result, and then controlling one or more of the first throttle valve 110, the second throttle valve 111 and the second flow rate adjusting valve 104 to make the air outlet temperature and the air outlet humidity of the fresh air handling unit 1 meet the air outlet control requirement includes:
if it is determined that the first flow rate adjusting valve 103 does not need to be opened, the first flow rate adjusting valve 103 is kept closed, the second flow rate adjusting valve 104 is opened, and then the first throttle valve 110 and the second throttle valve 111 are adjusted according to the inlet air temperature and the inlet air humidity, so that the outlet air temperature and the outlet air humidity of the fresh air handling unit 1 meet the outlet air control requirement.
Specifically, when T x ≤T xa When the preset dehumidification is required, the first flow rate adjusting valve 103 is kept closed, the second flow rate adjusting valve 104 is opened, the water-cooled condenser 102 is directly supplied with water only through the cold water source 2, and then the first throttle valve 110 and the second throttle valve 111 are adjusted according to the inlet air temperature and the inlet air humidity, so that the outlet air temperature and the outlet air humidity of the fresh air handling unit 1 meet the outlet air control requirement.
In one embodiment, the method further comprises:
and if the inlet air temperature and the inlet air humidity meet the outlet air control requirement, controlling the fresh air unit to only form inlet air, and not performing temperature and humidity control treatment on the inlet air.
Specifically, if the inlet air temperature and the inlet air humidity meet the outlet air control requirement, the outdoor air can be directly utilized, dehumidification and temperature regulation control are not needed, in this case, the fresh air unit 1 only needs to be started by the fan 112, the refrigerating system of the fresh air unit 1 does not need to operate, the water meter cooler 101 does not need to supply water, and the outdoor air is formed into inlet air by the fan 112 and is sent into a room.
Fig. 3 is a schematic structural diagram of a fresh air handling unit according to another embodiment of the present application, as shown in fig. 3, the fresh air handling unit 1 includes:
a memory 301 on which an executable program is stored;
a processor 302 for executing said executable program in said memory 301 for implementing the steps of the method described above in relation.
The specific manner in which the processor 302 executes the program in the memory 301 of the fresh air handling unit 1 in the above embodiment has been described in detail in the embodiment related to the method, and will not be described in detail here.
It is to be understood that the same or similar parts in the above embodiments may be referred to each other, and that in some embodiments, the same or similar parts in other embodiments may be referred to.
It should be noted that in the description of the present application, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, in the description of the present application, unless otherwise indicated, the meaning of "plurality", "multiple" means at least two.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected through intervening elements. Further, "connected" as used herein may include wireless connections. The use of the term "and/or" includes any and all combinations of one or more of the associated listed items.
Any process or method description in a flowchart or otherwise described herein may be understood as: means, segments, or portions of code representing executable instructions including one or more steps for implementing specific logical functions or processes are included in the preferred embodiments of the present application, in which functions may be executed out of order from that shown or discussed, including in a substantially simultaneous manner or in an inverse order, depending upon the functionality involved, as would be understood by those skilled in the art to which the embodiments of the present application pertains.
It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims (10)

1. The utility model provides a fresh air handling unit control method which characterized in that, fresh air handling unit includes:
the inlet of the water meter cooler is connected with the outlet of the cold water source;
the water inlet side of the water-cooling condenser is provided with a first flow path and a second flow path which are connected in parallel, the water inlet of the water-cooling condenser is connected with the outlet of the water meter cooler through the first flow path, and the water inlet of the water-cooling condenser is also connected with the outlet of the cold water source through the second flow path;
a first flow regulating valve arranged on the inlet side flow path of the water cooler and used for regulating the flow rate of the cold water supplied by the cold water source to the water cooler,
the second flow regulating valve is arranged on the second flow path and used for regulating the flow rate of the cold water directly supplied to the water-cooled condenser by the cold water source;
the evaporator is arranged on the air outlet side of the water meter cooler, and the inlet of the evaporator is connected with the refrigerant outlet of the water-cooling condenser;
the first throttle valve is arranged on the side flow of the refrigerant outlet of the water-cooled condenser;
the air-cooled condenser is arranged on the air outlet side of the evaporator, and the inlet of the evaporator is also connected with the outlet of the air-cooled condenser;
the second throttle valve is arranged on the outlet side flow of the air-cooled condenser;
the method comprises the following steps:
acquiring the air inlet temperature and the air inlet humidity of the air inlet side of the fresh air unit;
determining whether the inlet air temperature and the inlet air humidity meet the outlet air control requirement;
if the air inlet temperature and the air inlet humidity are not met, selectively controlling the water inlet of the water-cooled condenser, and respectively controlling the refrigerants supplied to the evaporator by the water-cooled condenser and the air-cooled condenser, so that the air outlet temperature and the air outlet humidity of the fresh air unit meet the air outlet control requirement;
the method comprises the steps of selectively controlling water inlet of the water-cooled condenser according to the air inlet temperature and the air inlet humidity, respectively controlling refrigerants supplied to the evaporator by the water-cooled condenser and the air-cooled condenser, enabling air outlet temperature and air outlet rheumatism of the fresh air unit to meet air outlet control requirements, and comprising the following steps:
determining whether the first flow regulating valve needs to be opened according to the relation between the air inlet temperature and a preset air inlet threshold temperature;
according to the determined result, performing a control operation matched with the air outlet temperature and the air outlet rheumatism of the fresh air unit, and then controlling one or more of the first throttle valve, the second throttle valve and the second flow regulating valve to enable the air outlet temperature and the air outlet rheumatism of the fresh air unit to meet the air outlet control requirement;
wherein, according to the relation between the air inlet temperature and the preset air inlet threshold temperature, determining whether the first flow regulating valve needs to be opened includes: if the air inlet temperature is greater than the preset air inlet threshold temperature, determining that the first flow regulating valve needs to be opened;
and according to the determination result, executing a control operation matched with the determination result, and then controlling one or more of the first throttle valve, the second throttle valve and the second flow regulating valve to enable the air outlet temperature and the air outlet rheumatism of the fresh air unit to meet the air outlet control requirement, wherein the control operation comprises the following steps:
opening the first flow regulating valve if it is determined that the first flow regulating valve needs to be opened;
acquiring the superheat degree of the fresh air unit, and according to the air inlet temperature and the air inlet humidity, adjusting the opening of the first throttle valve and the second throttle valve in combination with the superheat degree, and simultaneously acquiring the condensing pressure of the water-cooled condenser;
judging whether the second flow regulating valve is further opened to perform common control according to the relation between the condensing pressure and the preset condensing threshold pressure, so that the air outlet temperature and the air outlet rheumatism degree of the fresh air unit meet the air outlet control requirement;
judging whether to further open the second flow regulating valve for common control according to the relation between the condensation pressure and the preset condensation threshold pressure, so that the air outlet temperature and the air outlet rheumatism degree of the fresh air handling unit meet the air outlet control requirement, and comprising the following steps:
if the condensing pressure is larger than the preset condensing threshold pressure, opening the second flow regulating valve, and regulating the first throttle valve, the second throttle valve and the second flow regulating valve according to the air inlet temperature and the air inlet humidity and combining the superheat degree and the condensing pressure to enable the air outlet temperature and the air outlet rheumatism degree of the fresh air unit to meet the air outlet control requirement.
2. The method of claim 1, wherein determining whether the first flow regulating valve needs to be opened according to the relationship between the intake air temperature and a preset intake air threshold temperature comprises:
and if the inlet air temperature is less than or equal to the preset inlet air threshold temperature, determining that the first flow regulating valve is not required to be opened.
3. The method of claim 1, wherein the determining whether to further open the second flow regulating valve for common control according to the relationship between the condensation pressure and the preset condensation threshold pressure, so that the air outlet temperature and the air outlet humidity of the fresh air handling unit meet the air outlet control requirement, includes:
if the condensing pressure is smaller than or equal to the preset condensing threshold pressure, the second flow regulating valve is kept closed, and the first throttling valve and the second throttling valve are regulated according to the air inlet temperature and the air inlet humidity and the superheat degree, so that the air outlet temperature and the air outlet rheumatism degree of the fresh air unit meet the air outlet control requirement.
4. The method according to claim 1 or 2, wherein the performing a control operation matched with the determination result, and then controlling one or more of the first throttle valve, the second throttle valve, and the second flow rate adjustment valve to make the outlet air temperature and the outlet air humidity of the fresh air handling unit meet the outlet air control requirement includes:
if the first flow regulating valve is determined not to be required to be opened, the first flow regulating valve is kept closed, the second flow regulating valve is opened, and then the first throttling valve and the second throttling valve are regulated according to the air inlet temperature and the air inlet humidity, so that the air outlet temperature and the air outlet humidity of the fresh air unit meet the air outlet control requirement.
5. The method according to claim 1, wherein the method further comprises:
and if the inlet air temperature and the inlet air humidity meet the outlet air control requirement, controlling the fresh air unit to only form inlet air, and not performing temperature and humidity control treatment on the inlet air.
6. A fresh air handling unit, comprising:
a memory having an executable program stored thereon;
a processor for executing the executable program in the memory to implement the steps of the method of any one of claims 1-5.
7. A fresh air handling unit employing the method of any one of claims 1-5, the fresh air handling unit comprising:
the inlet of the water meter cooler is connected with the outlet of the cold water source;
the water inlet side of the water-cooling condenser is provided with a first flow path and a second flow path which are connected in parallel, the water inlet of the water-cooling condenser is connected with the outlet of the water meter cooler through the first flow path, and the water inlet of the water-cooling condenser is also connected with the outlet of the cold water source through the second flow path;
the first flow regulating valve is arranged on the inlet side flow path of the water meter cooler and is used for regulating the flow rate of the cold water supplied by the cold water source to the water meter cooler;
the second flow regulating valve is arranged on the second flow path and used for regulating the flow rate of the cold water directly supplied to the water-cooled condenser by the cold water source;
the evaporator is arranged on the air outlet side of the water meter cooler, and the inlet of the evaporator is connected with the refrigerant outlet of the water-cooling condenser;
the first throttle valve is arranged on the side flow of the refrigerant outlet of the water-cooled condenser;
the air-cooled condenser is arranged on the air outlet side of the evaporator, and the inlet of the evaporator is also connected with the outlet of the air-cooled condenser;
the second throttle valve is arranged on the outlet side flow of the air-cooled condenser;
the outlet of the compressor is respectively connected with the refrigerant inlet of the water-cooled condenser and the inlet of the air-cooled condenser, and the inlet of the compressor is connected with the outlet of the evaporator;
the fan is used for enabling the fresh air unit to form air inlet and sequentially passes through the water meter cooler, the evaporator and the air cooling condenser.
8. The fresh air handling unit of claim 7, wherein the fan is disposed on an air outlet side of the air-cooled condenser.
9. The fresh air handling unit of claim 7, further comprising:
and a check valve provided in the first flow path.
10. The fresh air handling unit of claim 7, further comprising:
and the water inlet side of the water-cooled condenser is connected with the first flow path and the second flow path through the water mixing valve.
CN201910971678.7A 2019-10-14 2019-10-14 Fresh air unit and control method Active CN110701691B (en)

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CN111306660A (en) * 2020-03-31 2020-06-19 江苏致远高科能源科技有限公司 Dehumidification and temperature regulation system of fresh air handling unit and temperature and humidity control method thereof
CN112413754B (en) * 2020-12-07 2021-12-17 珠海格力电器股份有限公司 Air dehumidification system and method and air conditioning equipment
CN113654113B (en) * 2021-08-10 2022-11-15 中山市爱美泰电器有限公司 Heat pump air conditioner with dehumidification function

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