CN111780269B - Control method and device for dehumidification heat pump - Google Patents

Control method and device for dehumidification heat pump Download PDF

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Publication number
CN111780269B
CN111780269B CN202010385994.9A CN202010385994A CN111780269B CN 111780269 B CN111780269 B CN 111780269B CN 202010385994 A CN202010385994 A CN 202010385994A CN 111780269 B CN111780269 B CN 111780269B
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temperature
coil
adjusting parameter
difference
determining
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CN111780269A (en
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杜泽波
余栋伟
陈曦
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Guangdong Aobote Energy Saving Equipment Co ltd
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Guangdong Aobote Energy Saving Equipment Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • 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
    • 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
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—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
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00—Heat pumps
    • F25B30/02—Heat pumps of the compression type
    • 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
    • F24F2003/144—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 by dehumidification only
    • F24F2003/1446—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 by dehumidification only by condensing
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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

Abstract

The invention discloses a control method and a device of a dehumidification heat pump, the method comprises the steps of obtaining a first coil temperature, a second coil temperature, a third coil temperature and an environment temperature at intervals of preset time, determining a corresponding dew point temperature according to the environment temperature, keeping a fan frequency or keeping the opening of a bypass air valve by combining the first coil temperature, the second coil temperature, the third coil temperature and the environment temperature and combining the comparison of the dew point temperature and a preset dew point return difference, or leading the comparison of the dew point temperature to control the air volume passing through an evaporator coil according to the dew point temperature by determining a first adjusting parameter and a second adjusting parameter and adjusting the fan frequency or adjusting the opening of the bypass air valve according to the first adjusting parameter and the second adjusting parameter so as to control the coil temperature to be close to the dew point temperature and further effectively remove moisture, the dehumidification effect is good. The invention can be widely applied to the field of dehumidification heat pumps.

Description

Control method and device for dehumidification heat pump
Technical Field
The invention relates to the field of dehumidification heat pumps, in particular to a control method and a control device of a dehumidification heat pump.
Background
At present, the dehumidification heat pump unit on the market comprises an evaporator, a compressor, a condenser, a fan and other components, during operation, humid air enters the evaporator through an air channel through fan air draft, condensation is formed on a coil pipe of the evaporator, formed moisture is discharged through a drainage pipe, the humid air is converted into dry cold air, meanwhile, generated heat energy is transferred to a cold liquid refrigerant, the liquid refrigerant is changed into a low-temperature low-pressure gaseous refrigerant, the low-temperature gaseous refrigerant then enters the compressor, the low-temperature gaseous refrigerant is changed into a high-temperature gaseous state through compression, the heat recovered through the condenser is released, and air is blown out through a condensing fan. However, the conventional dehumidification heat pump is not equipped with a dew point temperature control system, and cannot adjust the air volume passing through the coil of the evaporator according to the dew point temperature, and the temperature of the coil cannot be well controlled, so that moisture cannot be effectively removed, and the dehumidification effect is poor.
Disclosure of Invention
In view of the above, in order to solve the above technical problems, an object of the present invention is to provide a method and an apparatus for controlling a dehumidifying heat pump with good dehumidifying effect.
The technical scheme adopted by the invention is as follows: a control method of a dehumidification heat pump comprises the following steps:
acquiring a first coil temperature, a second coil temperature separated from the first coil temperature by a preset time, and a third coil temperature separated from the second coil temperature by the preset time;
acquiring an ambient temperature, and determining a corresponding dew point temperature according to the ambient temperature;
comparing the temperature of the third coil with the ambient temperature, and controlling the air quantity passing through the evaporator coil according to the comparison result, specifically:
if the ambient temperature is lower than the temperature of the third coil, or the ambient temperature is higher than the temperature of the third coil and the temperature of the third coil is within a first range determined according to the dew point temperature and the preset dew point return difference, maintaining the frequency of the fan or the opening degree of the bypass air valve;
if the environment temperature is not less than the third coil temperature and the third coil temperature is outside the first range, determining a first adjusting parameter according to a comparison result of the third coil temperature and the dew point temperature;
determining a first difference value between the temperature of the third coil and the temperature of the second coil, and a second difference value between the temperature of the second coil and the temperature of the first coil;
determining a second adjusting parameter according to the comparison result of the first difference and the second difference;
adjusting the frequency of the fan or adjusting the opening of the bypass air valve according to the first adjusting parameter and the second adjusting parameter;
acquiring a fourth coil temperature which is separated from the third coil temperature by a preset time, taking the second coil temperature as a new first coil temperature, taking the third coil temperature as a new second coil temperature, taking the fourth coil temperature as a new third coil temperature, returning to the step of acquiring the environment temperature, and determining the corresponding dew point temperature according to the environment temperature until the environment temperature is less than the third coil temperature, or the environment temperature is greater than the third coil temperature and the third coil temperature is within a first range;
wherein, the larger the opening degree of the bypass air valve is, the smaller the air quantity passing through the evaporator coil is.
Further, the step of determining the corresponding dew point temperature according to the ambient temperature includes the steps of:
obtaining saturated vapor pressure according to the environmental temperature and a preset formula;
and obtaining the corresponding dew point temperature according to the saturated vapor pressure.
Further, the step of maintaining the fan frequency or the opening degree of the bypass damper, where the ambient temperature is greater than the third coil temperature and the third coil temperature is within a first range determined according to the dew point temperature and the preset dew point return difference, specifically:
determining a first range according to the sum of the dew point temperature and a preset dew point return difference and the difference between the dew point temperature and the preset dew point return difference;
and if the ambient temperature is greater than the temperature of the third coil and the temperature of the third coil is within the first range, keeping the frequency of the fan or keeping the opening of the side ventilation valve.
Further, the step of determining the first adjustment parameter according to the comparison result between the third coil temperature and the dew point temperature if the ambient temperature is not less than the third coil temperature and the third coil temperature is outside the first range includes the following steps:
if the ambient temperature is not less than the third coil temperature and the third coil temperature is outside the first range:
if the temperature of the third coil is higher than the dew point temperature, determining that the first adjusting parameter is a first value;
if the temperature of the third coil is lower than the dew point temperature, determining that the first adjusting parameter is a second value;
wherein the first and second values have opposite signs.
Further, the step of determining the second adjustment parameter according to the comparison result of the first difference and the second difference includes the following steps:
determining a second adjustment parameter in a first manner, specifically:
when the first adjusting parameter is a first value:
if the first difference is smaller than the second difference, determining that the second adjusting parameter is a third value;
if the first difference is larger than or equal to the second difference, determining that the second adjusting parameter is a fourth value;
when the first adjusting parameter is the second value:
if the first difference is smaller than the second difference, determining that the second adjusting parameter is a fourth value;
if the first difference is larger than or equal to the second difference, determining that the second adjusting parameter is a third value;
the third numerical value has the same sign as the first numerical value, and the fourth numerical value has the same sign as the second numerical value.
Further, in the step of adjusting the fan frequency according to the first adjustment parameter and the second adjustment parameter, the method comprises the following steps:
and adjusting the fan frequency according to the preset frequency, the first adjusting parameter and the second adjusting parameter, wherein the product of the first adjusting parameter and the second adjusting parameter is in positive correlation with the fan frequency.
Further, the step of determining the second adjustment parameter according to the comparison result of the first difference and the second difference includes the following steps:
determining a second adjustment parameter in a second manner, specifically:
when the first adjusting parameter is a first value:
if the first difference is smaller than the second difference, determining that the second adjusting parameter is a fourth value;
if the first difference is larger than or equal to the second difference, determining that the second adjusting parameter is a third value;
when the first adjusting parameter is the second value:
if the first difference is smaller than the second difference, determining that the second adjusting parameter is a third value;
if the first difference is larger than or equal to the second difference, determining that the second adjusting parameter is a fourth value;
the third numerical value has the same sign as the first numerical value, and the fourth numerical value has the same sign as the second numerical value.
Further, the step of adjusting the opening degree of the bypass damper according to the first adjustment parameter and the second adjustment parameter includes the steps of:
and adjusting the opening degree of the bypass air valve according to the preset angle, the first adjusting parameter and the second adjusting parameter, wherein the product of the first adjusting parameter and the second adjusting parameter is in positive correlation with the opening degree of the bypass air valve.
The present invention also provides an apparatus comprising:
the acquisition module is used for acquiring the temperature of a first coil, the temperature of a second coil separated from the temperature of the first coil by a preset time, the temperature of a third coil separated from the temperature of the second coil by a preset time and acquiring the ambient temperature;
the control module is used for determining the corresponding dew point temperature according to the ambient temperature, comparing the temperature of the third coil with the ambient temperature, and controlling the air volume passing through the evaporator coil according to a comparison result, specifically:
if the ambient temperature is lower than the temperature of the third coil, or the ambient temperature is higher than the temperature of the third coil and the temperature of the third coil is within a first range determined according to the dew point temperature and the preset dew point return difference, maintaining the frequency of the fan or the opening degree of the bypass air valve;
if the third coil temperature is out of the first range, determining a first adjusting parameter according to a comparison result of the third coil temperature and the dew point temperature;
determining a first difference value between the temperature of the third coil and the temperature of the second coil, and a second difference value between the temperature of the second coil and the temperature of the first coil;
determining a second adjusting parameter according to the comparison result of the first difference and the second difference;
adjusting the frequency of the fan or adjusting the opening of the bypass air valve according to the first adjusting parameter and the second adjusting parameter;
controlling the acquisition module to acquire the ambient temperature and a fourth coil temperature which is separated from the third coil temperature by a preset time, taking the second coil temperature as a new first coil temperature, taking the third coil temperature as a new second coil temperature, taking the fourth coil temperature as a new third coil temperature, and returning to the step of determining the corresponding dew point temperature according to the ambient temperature until the ambient temperature is less than the third coil temperature, or the ambient temperature is greater than the third coil temperature and the third coil temperature is within a first range;
wherein, the larger the opening degree of the bypass air valve is, the smaller the air quantity passing through the evaporator coil is.
The present invention also provides another apparatus comprising:
the system comprises a plurality of sensors, a first coil temperature sensor, a second coil temperature sensor, a third coil temperature sensor and a control unit, wherein the plurality of sensors are used for acquiring the first coil temperature, the second coil temperature separated from the first coil temperature by a preset time, the third coil temperature separated from the second coil temperature by a preset time and acquiring the ambient temperature;
the control mainboard is used for determining the corresponding dew point temperature according to the ambient temperature, comparing the temperature of the third coil with the ambient temperature, and controlling the air volume passing through the evaporator coil according to the comparison result, specifically:
if the ambient temperature is lower than the temperature of the third coil, or the ambient temperature is higher than the temperature of the third coil and the temperature of the third coil is within a first range determined according to the dew point temperature and the preset dew point return difference, maintaining the frequency of the fan or the opening degree of the bypass air valve;
if the third coil temperature is out of the first range, determining a first adjusting parameter according to a comparison result of the third coil temperature and the dew point temperature;
determining a first difference value between the temperature of the third coil and the temperature of the second coil, and a second difference value between the temperature of the second coil and the temperature of the first coil;
determining a second adjusting parameter according to the comparison result of the first difference and the second difference;
adjusting the frequency of the fan or adjusting the opening of the bypass air valve according to the first adjusting parameter and the second adjusting parameter;
controlling the plurality of sensors to acquire the ambient temperature and a fourth coil temperature which is separated from the third coil temperature by a preset time, taking the second coil temperature as a new first coil temperature, taking the third coil temperature as a new second coil temperature, taking the fourth coil temperature as a new third coil temperature, and returning to the step of determining the corresponding dew point temperature according to the ambient temperature until the ambient temperature is less than the third coil temperature, or the ambient temperature is greater than the third coil temperature and the third coil temperature is within a first range;
wherein, the larger the opening degree of the bypass air valve is, the smaller the air quantity passing through the evaporator coil is.
The invention has the beneficial effects that: the method comprises the steps of obtaining a first coil temperature, a second coil temperature and a third coil temperature which are separated by preset time, and an environment temperature, determining a corresponding dew point temperature according to the environment temperature, keeping the fan frequency or keeping the opening degree of a bypass air valve by combining the first coil temperature, the second coil temperature, the third coil temperature and the environment temperature and comparing the dew point temperature with a preset dew point return difference, or determining a first adjusting parameter and a second adjusting parameter, adjusting the fan frequency or adjusting the opening degree of the bypass air valve according to the first adjusting parameter and the second adjusting parameter, introducing the comparison of the dew point temperature to control the air volume passing through an evaporator coil according to the dew point temperature, enabling the coil temperature to be well controlled to be close to the dew point temperature, further enabling moisture to be effectively removed, and achieving a good dehumidification effect.
Drawings
FIG. 1 is a schematic flow chart of the steps of the method of the present invention;
fig. 2 is a schematic diagram of a part of a dehumidifying heat pump according to an embodiment of the present invention.
Detailed Description
The invention will be further explained and explained with reference to the drawings and the embodiments in the description. The step numbers in the embodiments of the present invention are set for convenience of illustration only, the order between the steps is not limited at all, and the execution order of each step in the embodiments can be adaptively adjusted according to the understanding of those skilled in the art.
As shown in fig. 1, the present embodiment provides a control method of a dehumidification heat pump, including the following steps:
acquiring a first coil temperature, a second coil temperature separated from the first coil temperature by a preset time, and a third coil temperature separated from the second coil temperature by the preset time;
acquiring an ambient temperature, and determining a corresponding dew point temperature according to the ambient temperature;
comparing the temperature of the third coil with the ambient temperature, and controlling the air quantity passing through the evaporator coil according to the comparison result, specifically:
if the ambient temperature is lower than the temperature of the third coil, or the ambient temperature is higher than the temperature of the third coil and the temperature of the third coil is within a first range determined according to the dew point temperature and the preset dew point return difference, maintaining the frequency of the fan or the opening degree of the bypass air valve;
if the third coil temperature is out of the first range, determining a first adjusting parameter according to a comparison result of the third coil temperature and the dew point temperature;
determining a first difference value between the temperature of the third coil and the temperature of the second coil, and a second difference value between the temperature of the second coil and the temperature of the first coil;
determining a second adjusting parameter according to the comparison result of the first difference and the second difference;
adjusting the frequency of the fan or adjusting the opening of the bypass air valve according to the first adjusting parameter and the second adjusting parameter;
acquiring a fourth coil temperature which is separated from the third coil temperature by a preset time, taking the second coil temperature as a new first coil temperature, taking the third coil temperature as a new second coil temperature, taking the fourth coil temperature as a new third coil temperature, returning to the step of acquiring the environment temperature, and determining the corresponding dew point temperature according to the environment temperature until the environment temperature is less than the third coil temperature, or the environment temperature is greater than the third coil temperature and the third coil temperature is within a first range;
wherein, the larger the opening degree of the bypass air valve is, the smaller the air quantity passing through the evaporator coil is.
As shown in fig. 2, in the present embodiment, the ambient temperature refers to a temperature other than the heat pump, and the environment may be, for example, a baking room, a swimming pool, or the like; the fan 1 is a variable frequency fan, the coil refers to a coil of the evaporator 2, the fan draws in ambient air from an air channel of the dehumidification heat pump, the air channel comprises a main air channel 3 and a bypass air channel 4, the air entering from the main air channel 3 passes through the evaporator coil, and the air entering from the bypass air channel 4 does not pass through the evaporator coil, so that when the opening degree of a bypass air valve 5 on the bypass air channel 4 is larger, the air entering through the main air channel 3 is smaller, namely the air passing through the evaporator coil is smaller. Meanwhile, in the actual operation of the dehumidification heat pump, the larger the air quantity passing through the evaporator coil is, the faster the temperature of the coil is raised, the smaller the air quantity passing through the evaporator coil is, the slower the temperature of the coil is raised or even the temperature of the coil is possibly lowered, so that the air quantity passing through the evaporator coil can be controlled, and the temperature of the coil is adjusted. For example, the amount of air passing through the evaporator coil is controlled by controlling the bypass damper opening or the fan frequency, wherein the greater the fan frequency, the greater the amount of air passing through the evaporator coil.
In this embodiment, specifically, the following steps are included:
s1, acquiring and processing temperature data; specifically, the following steps may be included:
s11, acquiring the temperature of a first coil, the temperature of a second coil separated from the temperature of the first coil by a preset time, and the temperature of a third coil separated from the temperature of the second coil by a preset time and the ambient temperature through sensors such as a temperature sensor, a temperature and humidity probe and the like;
in the present embodiment, the preset time is 3 minutes (min) depending on the operation period of the compressor.
For example: the coil temperature of the first period, namely the first coil temperature CT1, is obtained at an interval of 3min, the coil temperature of the second period, namely the second coil temperature CT2, is obtained at an interval of 3min, the coil temperature of the third period, namely the third coil temperature CT3, and at this time, the ambient temperature T is obtained.
S12, determining the corresponding dew point temperature according to the environment temperature T;
obtaining saturated vapor pressure E according to the environmental temperature T and a preset formulaW；
Obtaining corresponding dew point temperature according to the saturated vapor pressure;
the preset formula is as follows:
Figure RE-GDA0002662429980000061
calculating to obtain saturated vapor pressure EWObtaining corresponding dew point temperature by preset comparison data, wherein the preset comparison data is shown in table 1, EWI.e. P, t ℃ i.e. dew point temperature:
TABLE 1
Saturated vapor pressure (P) at different temperatures (unit: mm high mercury column)
Figure BDA0002483852970000071
And S2, comparing the temperature of the third coil with the ambient temperature, and controlling the air quantity passing through the evaporator coil according to the comparison result.
1) If the control mode is to control the air quantity passing through the evaporator coil by controlling the frequency of the fan, the method specifically comprises the following steps:
if the ambient temperature is lower than the third coil temperature, or the ambient temperature is higher than the third coil temperature and the third coil temperature is within a first range determined according to the dew point temperature and the preset dew point return difference, keeping the current fan frequency unchanged; in this embodiment, the first range is: (dew point temperature-preset dew point return difference, dew point temperature + preset dew point return difference), wherein the preset dew point return difference is determined according to actual requirements.
If the ambient temperature is not less than the third coil temperature and the third coil temperature is outside the first range, the method specifically comprises the following steps: s21, determining a first adjustment parameter according to the comparison result between the third coil temperature and the dew point temperature, specifically, the method may include the following steps:
if the ambient temperature is not less than the third coil temperature and the third coil temperature is outside the first range:
if the temperature of the third coil is higher than the dew point temperature, determining that the first adjusting parameter is a first numerical value, and KP is + 1;
if the temperature of the third coil is lower than the dew point temperature, determining that the first adjusting parameter is a second numerical value, and KP is-1;
wherein the first and second values have opposite signs, which means positive "+" and negative "-". In this embodiment, the first adjustment parameter is KP, the first value is +1, the second value is-1, and the adjustment may be performed according to the situation in other embodiments.
S22, determining a first difference value between the third coil temperature and the second coil temperature, and a second difference value between the second coil temperature and the first coil temperature:
the first difference value: CT3-CT 2; the second difference value: CT2-CT 1.
S23, determining a second adjusting parameter according to the comparison result of the first difference and the second difference;
determining a second adjustment parameter in a first manner, specifically:
when the first adjusting parameter is a first value:
if the first difference is smaller than the second difference, determining that the second adjusting parameter is a third value;
if the first difference is larger than or equal to the second difference, determining that the second adjusting parameter is a fourth value;
when the first adjusting parameter is the second value:
if the first difference is smaller than the second difference, determining that the second adjusting parameter is a fourth value;
if the first difference is larger than or equal to the second difference, determining that the second adjusting parameter is a third value;
the third numerical value has the same sign as the first numerical value, and the fourth numerical value has the same sign as the second numerical value.
In this embodiment, the second adjustment parameter is KI, the third value is +1, and the fourth value is-1, which may be adjusted according to actual conditions in other embodiments. And the amplitude of the temperature rise or the temperature reduction in the period is compared with the amplitude of the temperature rise or the temperature reduction in the previous period by comparing the first difference value with the second difference value, so that the second adjusting parameter is adjusted, and the effectiveness of the subsequent calculation process and the adjusting process is ensured.
S24, adjusting the fan frequency according to the first adjusting parameter and the second adjusting parameter, specifically:
adjusting the fan frequency according to a preset frequency, a first adjusting parameter and a second adjusting parameter, wherein the product of the first adjusting parameter and the second adjusting parameter is positively correlated with the fan frequency, and the adjusting formula of the fan frequency is as follows:
setting the target frequency as the current frequency plus the preset frequency multiplied by KP multiplied by KI;
in this embodiment, the preset frequency is 2Hz, and the fan frequency is adjusted through the determined first adjusting parameter KP, the second adjusting parameter KI and the preset frequency.
S25, acquiring a fourth coil temperature which is separated from the third coil temperature by a preset time, taking the second coil temperature as a new first coil temperature, taking the third coil temperature as a new second coil temperature, taking the fourth coil temperature as a new third coil temperature, returning to the step of acquiring the environment temperature, and determining the corresponding dew point temperature according to the environment temperature until the environment temperature is less than the third coil temperature, or the environment temperature is greater than the third coil temperature and the third coil temperature is within a first range;
for example: after obtaining the third coil temperature for 3min, obtaining a fourth coil temperature CT4, taking the original second coil temperature as a new first coil temperature CT1, taking the third coil temperature as a new second coil temperature CT2, taking the fourth coil temperature CT4 as a new third coil temperature CT3, returning to obtain the ambient temperature, determining the corresponding dew point temperature according to the ambient temperature (i.e., obtaining a new ambient temperature T again, and returning to step S12), and adjusting the fan frequency until the ambient temperature is less than the third coil temperature, or the ambient temperature is greater than the third coil temperature and the third coil temperature is within the first range, and at this time, keeping the current fan frequency unchanged.
Further as an optional embodiment, after the preset time interval, continuously acquiring a new ambient temperature and a new coil temperature, and according to the coil temperatures of the last two cycles, executing step S12 to continuously maintain the fan frequency or increase or decrease the fan frequency when the dehumidifying heat pump is in the working state.
2) If the control mode is to control the air quantity passing through the evaporator coil by adjusting the opening of the bypass air valve, the method specifically comprises the following steps:
if the ambient temperature is lower than the temperature of the third coil, or the ambient temperature is higher than the temperature of the third coil and the temperature of the third coil is within a first range determined according to the dew point temperature and the preset dew point return difference, keeping the opening degree of the bypass air valve unchanged; in this embodiment, the first range is: (dew point temperature-preset dew point return difference, dew point temperature + preset dew point return difference), wherein the preset dew point return difference is determined according to actual requirements.
If the ambient temperature is not less than the third coil temperature and the third coil temperature is outside the first range, the method specifically comprises the following steps: s21' is the same as step S21, S22 is the same as step S22;
s23', determining a second adjusting parameter according to the comparison result of the first difference and the second difference;
determining a second adjustment parameter in a second manner, specifically:
when the first adjusting parameter is a first value:
if the first difference is smaller than the second difference, determining that the second adjusting parameter is a fourth value;
if the first difference is larger than or equal to the second difference, determining that the second adjusting parameter is a third value;
when the first adjusting parameter is the second value:
if the first difference is smaller than the second difference, determining that the second adjusting parameter is a third value;
if the first difference is larger than or equal to the second difference, determining that the second adjusting parameter is a fourth value;
the third numerical value has the same sign as the first numerical value, and the fourth numerical value has the same sign as the second numerical value.
In this embodiment, the first adjustment parameter is KP, the second adjustment parameter is KI, the first value and the third value are +1, the second value and the fourth value are-1, and other values may be used in other embodiments.
S24', adjusting the opening degree of the bypass air valve according to the first adjusting parameter and the second adjusting parameter, specifically:
according to preset angle, first adjusting parameter and second adjusting parameter, adjust bypass air valve aperture, wherein, the product of first adjusting parameter and second adjusting parameter becomes positive correlation with bypass air valve aperture, and bypass air valve aperture expresses with the form of angle, and the regulation formula is:
the target angle is equal to the current angle + the preset angle multiplied by KP multiplied by KI
In this embodiment, the preset angle is 3 °, and the opening of the bypass damper is adjusted according to the preset angle, the determined first adjustment parameter and the determined second adjustment parameter, wherein when the opening of the bypass damper is 0 °, the bypass damper is completely closed.
S25', acquiring a fourth coil temperature which is separated from the third coil temperature by a preset time, taking the second coil temperature as a new first coil temperature, taking the third coil temperature as a new second coil temperature, taking the fourth coil temperature as a new third coil temperature, returning to the step of acquiring the environment temperature, and determining the corresponding dew point temperature according to the environment temperature until the environment temperature is less than the third coil temperature, or the environment temperature is greater than the third coil temperature and the third coil temperature is within a first range;
for example: after 3min of the third coil temperature is obtained, a fourth coil temperature CT4 is obtained, the original second coil temperature is used as a new first coil temperature CT1, the third coil temperature is used as a new second coil temperature CT2, the fourth coil temperature CT4 is used as a new third coil temperature CT3, the step of obtaining the ambient temperature is returned, the corresponding dew point temperature is determined according to the ambient temperature (namely, the new ambient temperature T is obtained again, and the step S12 is returned), the opening of the bypass ventilation valve is adjusted until the ambient temperature is smaller than the third coil temperature, or the ambient temperature is greater than the third coil temperature and the third coil temperature is within the first range, and at the moment, the current opening of the bypass ventilation valve is kept unchanged.
Further as an optional embodiment, after the preset time interval, continuously acquiring a new ambient temperature and a new coil temperature, and according to the coil temperatures of the last two cycles, performing step S12, and continuously maintaining the bypass vent valve opening or increasing or decreasing the bypass vent valve opening when the dehumidification heat pump is in the working state.
Further as an optional implementation manner, in other embodiments, a manner of combining the fan frequency adjustment and the bypass damper opening adjustment may be adopted, for example, the fan frequency adjustment is adopted, the bypass damper opening adjustment is adopted in the next period, or after the fan frequency adjustment is adopted for a plurality of periods, the bypass damper opening adjustment is adopted, and then after one or a plurality of periods of adjustment, the fan frequency adjustment is adopted again, and the method alternates continuously. By adopting the mode, when the frequency of the fan reaches the limit and cannot be continuously adjusted, or the opening degree of the bypass air valve reaches the limit and cannot be adjusted, the dehumidification effect of the dehumidification heat pump can be kept.
The present invention also provides an apparatus comprising:
the acquisition module is used for acquiring the temperature of a first coil, the temperature of a second coil separated from the temperature of the first coil by a preset time, the temperature of a third coil separated from the temperature of the second coil by a preset time and acquiring the ambient temperature;
the control module is used for determining the corresponding dew point temperature according to the ambient temperature, comparing the temperature of the third coil with the ambient temperature, and controlling the air volume passing through the evaporator coil according to a comparison result, specifically:
if the ambient temperature is lower than the temperature of the third coil, or the ambient temperature is higher than the temperature of the third coil and the temperature of the third coil is within a first range determined according to the dew point temperature and the preset dew point return difference, maintaining the frequency of the fan or the opening degree of the bypass air valve;
if the third coil temperature is out of the first range, determining a first adjusting parameter according to a comparison result of the third coil temperature and the dew point temperature;
determining a first difference value between the temperature of the third coil and the temperature of the second coil, and a second difference value between the temperature of the second coil and the temperature of the first coil;
determining a second adjusting parameter according to the comparison result of the first difference and the second difference;
adjusting the frequency of the fan or adjusting the opening of the bypass air valve according to the first adjusting parameter and the second adjusting parameter;
controlling the acquisition module to acquire the ambient temperature and a fourth coil temperature which is separated from the third coil temperature by a preset time, taking the second coil temperature as a new first coil temperature, taking the third coil temperature as a new second coil temperature, taking the fourth coil temperature as a new third coil temperature, and returning to the step of determining the corresponding dew point temperature according to the ambient temperature until the ambient temperature is less than the third coil temperature, or the ambient temperature is greater than the third coil temperature and the third coil temperature is within a first range;
wherein, the larger the opening degree of the bypass air valve is, the smaller the air quantity passing through the evaporator coil is.
The contents in the above method embodiments are all applicable to the present apparatus embodiment, the functions specifically implemented by the present apparatus embodiment are the same as those in the above method embodiments, and the advantageous effects achieved by the present apparatus embodiment are also the same as those achieved by the above method embodiments.
The present invention also provides another apparatus comprising:
the system comprises a plurality of sensors, a first coil temperature sensor, a second coil temperature sensor, a third coil temperature sensor and a control unit, wherein the plurality of sensors are used for acquiring the first coil temperature, the second coil temperature separated from the first coil temperature by a preset time, the third coil temperature separated from the second coil temperature by a preset time and acquiring the ambient temperature;
the control mainboard is used for determining the corresponding dew point temperature according to the ambient temperature, comparing the temperature of the third coil with the ambient temperature, and controlling the air volume passing through the evaporator coil according to the comparison result, specifically:
if the ambient temperature is lower than the temperature of the third coil, or the ambient temperature is higher than the temperature of the third coil and the temperature of the third coil is within a first range determined according to the dew point temperature and the preset dew point return difference, maintaining the frequency of the fan or the opening degree of the bypass air valve;
if the third coil temperature is out of the first range, determining a first adjusting parameter according to a comparison result of the third coil temperature and the dew point temperature;
determining a first difference value between the temperature of the third coil and the temperature of the second coil, and a second difference value between the temperature of the second coil and the temperature of the first coil;
determining a second adjusting parameter according to the comparison result of the first difference and the second difference;
adjusting the frequency of the fan or adjusting the opening of the bypass air valve according to the first adjusting parameter and the second adjusting parameter;
controlling the plurality of sensors to acquire the ambient temperature and a fourth coil temperature which is separated from the third coil temperature by a preset time, taking the second coil temperature as a new first coil temperature, taking the third coil temperature as a new second coil temperature, taking the fourth coil temperature as a new third coil temperature, and returning to the step of determining the corresponding dew point temperature according to the ambient temperature until the ambient temperature is less than the third coil temperature, or the ambient temperature is greater than the third coil temperature and the third coil temperature is within a first range;
wherein, the larger the opening degree of the bypass air valve is, the smaller the air quantity passing through the evaporator coil is.
The control mainboard can be a mainboard comprising a controller and a circuit, and the controller can be a controller of a single chip microcomputer, a PLC, an FPGA and the like. In this embodiment, control mainboard and fan adopt the 485 communication form, acquire the converter current frequency of frequency conversion fan through the 485 communication, adopt analog signal output, only output voltage signal, this voltage signal is for lasting output, if the converter cuts off the power supply midway and becomes other frequencies, the back of switching on again, the voltage signal of control mainboard output can make the converter adjust to corresponding frequency target.
The contents in the above method embodiments are all applicable to the present apparatus embodiment, the functions specifically implemented by the present apparatus embodiment are the same as those in the above method embodiments, and the advantageous effects achieved by the present apparatus embodiment are also the same as those achieved by the above method embodiments.
In some alternative embodiments, the embodiments presented and described in the context of the steps of the present invention are provided by way of example in order to provide a more thorough understanding of the technology. The disclosed methods are not limited to the operations and logic flows presented herein. Alternative embodiments are contemplated in which the order of various operations is changed and in which sub-operations described as part of larger operations are performed independently.
Furthermore, although the present invention is described in the context of functional modules, it should be understood that, unless otherwise stated to the contrary, one or more of the described functions and/or features may be integrated in a single physical device and/or software module, or one or more functions and/or features may be implemented in a separate physical device or software module. It is also to be understood that a detailed discussion of the actual implementation of each module is not necessary for an understanding of the present invention. Rather, the actual implementation of the various functional blocks of the apparatus disclosed herein will be understood within the ordinary skill of an engineer in view of the attributes, functionality, and internal relationships of the blocks. Accordingly, those skilled in the art can, using ordinary skill, practice the invention as set forth in the claims without undue experimentation. It is also to be understood that the specific concepts disclosed are merely illustrative of and not intended to limit the scope of the invention, which is defined by the appended claims and their full scope of equivalents.
In the description herein, references to the description of the term "one embodiment," "the present embodiment," "an example," "a specific example," or "some examples," etc., mean 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (9)

1. A control method of a dehumidification heat pump is characterized by comprising the following steps:
acquiring a first coil temperature, a second coil temperature separated from the first coil temperature by a preset time, and a third coil temperature separated from the second coil temperature by the preset time;
acquiring an ambient temperature, and determining a corresponding dew point temperature according to the ambient temperature;
comparing the temperature of the third coil with the ambient temperature, and controlling the air quantity passing through the evaporator coil according to the comparison result, specifically:
if the ambient temperature is lower than the temperature of the third coil, or the ambient temperature is higher than the temperature of the third coil and the temperature of the third coil is within a first range determined according to the dew point temperature and the preset dew point return difference, maintaining the frequency of the fan or the opening degree of the bypass air valve;
if the environment temperature is not less than the third coil temperature and the third coil temperature is outside the first range, determining a first adjusting parameter according to a comparison result of the third coil temperature and the dew point temperature;
determining a first difference value between the temperature of the third coil and the temperature of the second coil, and a second difference value between the temperature of the second coil and the temperature of the first coil;
determining a second adjusting parameter according to the comparison result of the first difference and the second difference;
adjusting the frequency of the fan or adjusting the opening of the bypass air valve according to the first adjusting parameter and the second adjusting parameter;
acquiring a fourth coil temperature which is separated from the third coil temperature by a preset time, taking the second coil temperature as a new first coil temperature, taking the third coil temperature as a new second coil temperature, taking the fourth coil temperature as a new third coil temperature, returning to the step of acquiring the environment temperature, and determining the corresponding dew point temperature according to the environment temperature until the environment temperature is less than the third coil temperature, or the environment temperature is greater than the third coil temperature and the third coil temperature is within a first range;
the larger the opening of the bypass air valve is, the smaller the air quantity passing through the evaporator coil is;
according to the first adjusting parameter and the second adjusting parameter, in the step of adjusting the fan frequency, the method comprises the following steps:
and adjusting the fan frequency according to the preset frequency, the first adjusting parameter and the second adjusting parameter, wherein the product of the first adjusting parameter and the second adjusting parameter is in positive correlation with the fan frequency.
2. The control method of the dehumidifying heat pump according to claim 1, wherein: the step of determining the corresponding dew point temperature according to the ambient temperature comprises the following steps:
obtaining saturated vapor pressure according to the environmental temperature and a preset formula;
and obtaining the corresponding dew point temperature according to the saturated vapor pressure.
3. The control method of the dehumidifying heat pump according to claim 1, wherein: or the environment temperature is greater than the third coil temperature and the third coil temperature is within a first range determined according to the dew point temperature and a preset dew point return difference, and the fan frequency or the opening degree of the bypass air valve is maintained, specifically:
determining a first range according to the sum of the dew point temperature and the preset dew point return difference and the difference between the dew point temperature and the preset dew point return difference;
and if the ambient temperature is greater than the temperature of the third coil pipe and the temperature of the third coil pipe is within the first range, maintaining the frequency of the fan or the opening degree of the bypass air valve.
4. The control method of the dehumidifying heat pump according to claim 1, wherein: if the environment temperature is not less than the third coil temperature and the third coil temperature is outside the first range, the step of determining the first adjusting parameter according to the comparison result of the third coil temperature and the dew point temperature comprises the following steps:
if the ambient temperature is not less than the third coil temperature and the third coil temperature is outside the first range:
if the temperature of the third coil is higher than the dew point temperature, determining that the first adjusting parameter is a first value;
if the temperature of the third coil is lower than the dew point temperature, determining that the first adjusting parameter is a second value;
wherein the first and second values have opposite signs.
5. The control method of the dehumidifying heat pump according to claim 4, wherein: the step of determining the second adjustment parameter according to the comparison result of the first difference and the second difference includes the following steps:
determining a second adjustment parameter in a first manner, specifically:
when the first adjusting parameter is a first value:
if the first difference is smaller than the second difference, determining that the second adjusting parameter is a third value;
if the first difference is larger than or equal to the second difference, determining that the second adjusting parameter is a fourth value;
when the first adjusting parameter is the second value:
if the first difference is smaller than the second difference, determining that the second adjusting parameter is a fourth value;
if the first difference is larger than or equal to the second difference, determining that the second adjusting parameter is a third value;
the third numerical value has the same sign as the first numerical value, and the fourth numerical value has the same sign as the second numerical value.
6. The control method of the dehumidifying heat pump according to claim 4, wherein: the step of determining the second adjustment parameter according to the comparison result of the first difference and the second difference includes the following steps:
determining a second adjustment parameter in a second manner, specifically:
when the first adjusting parameter is a first value:
if the first difference is smaller than the second difference, determining that the second adjusting parameter is a fourth value;
if the first difference is larger than or equal to the second difference, determining that the second adjusting parameter is a third value;
when the first adjusting parameter is the second value:
if the first difference is smaller than the second difference, determining that the second adjusting parameter is a third value;
if the first difference is larger than or equal to the second difference, determining that the second adjusting parameter is a fourth value;
the third numerical value has the same sign as the first numerical value, and the fourth numerical value has the same sign as the second numerical value.
7. The control method of the dehumidifying heat pump according to claim 6, wherein: the step of adjusting the opening degree of the bypass air valve according to the first adjusting parameter and the second adjusting parameter comprises the following steps:
and adjusting the opening degree of the bypass air valve according to the preset angle, the first adjusting parameter and the second adjusting parameter, wherein the product of the first adjusting parameter and the second adjusting parameter is in positive correlation with the opening degree of the bypass air valve.
8. A control apparatus for a desiccant heat pump, comprising:
the acquisition module is used for acquiring the temperature of a first coil, the temperature of a second coil separated from the temperature of the first coil by a preset time, the temperature of a third coil separated from the temperature of the second coil by a preset time and acquiring the ambient temperature;
the control module is used for determining the corresponding dew point temperature according to the ambient temperature, comparing the temperature of the third coil with the ambient temperature, and controlling the air volume passing through the evaporator coil according to the comparison result, specifically:
if the ambient temperature is lower than the temperature of the third coil, or the ambient temperature is higher than the temperature of the third coil and the temperature of the third coil is within a first range determined according to the dew point temperature and the preset dew point return difference, maintaining the frequency of the fan or the opening degree of the bypass air valve;
if the third coil temperature is out of the first range, determining a first adjusting parameter according to a comparison result of the third coil temperature and the dew point temperature;
determining a first difference value between the temperature of the third coil and the temperature of the second coil, and a second difference value between the temperature of the second coil and the temperature of the first coil;
determining a second adjusting parameter according to the comparison result of the first difference and the second difference;
adjusting the frequency of the fan or adjusting the opening of the bypass air valve according to the first adjusting parameter and the second adjusting parameter;
controlling the acquisition module to acquire the ambient temperature and a fourth coil temperature which is separated from the third coil temperature by a preset time, taking the second coil temperature as a new first coil temperature, taking the third coil temperature as a new second coil temperature, taking the fourth coil temperature as a new third coil temperature, and returning to the step of determining the corresponding dew point temperature according to the ambient temperature until the ambient temperature is less than the third coil temperature, or the ambient temperature is greater than the third coil temperature and the third coil temperature is within a first range;
the larger the opening of the bypass air valve is, the smaller the air quantity passing through the evaporator coil is;
according to the first adjusting parameter and the second adjusting parameter, in the step of adjusting the fan frequency, the method comprises the following steps:
and adjusting the fan frequency according to the preset frequency, the first adjusting parameter and the second adjusting parameter, wherein the product of the first adjusting parameter and the second adjusting parameter is in positive correlation with the fan frequency.
9. A control apparatus for a desiccant heat pump, comprising:
the system comprises a plurality of sensors, a first coil temperature sensor, a second coil temperature sensor, a third coil temperature sensor and a control unit, wherein the plurality of sensors are used for acquiring the first coil temperature, the second coil temperature separated from the first coil temperature by a preset time, the third coil temperature separated from the second coil temperature by a preset time and acquiring the ambient temperature;
the control mainboard is used for determining the corresponding dew point temperature according to the ambient temperature, comparing the temperature of the third coil with the ambient temperature, and controlling the air volume passing through the evaporator coil according to the comparison result, specifically:
if the ambient temperature is lower than the temperature of the third coil, or the ambient temperature is higher than the temperature of the third coil and the temperature of the third coil is within a first range determined according to the dew point temperature and the preset dew point return difference, maintaining the frequency of the fan or the opening degree of the bypass air valve;
if the third coil temperature is out of the first range, determining a first adjusting parameter according to a comparison result of the third coil temperature and the dew point temperature;
determining a first difference value between the temperature of the third coil and the temperature of the second coil, and a second difference value between the temperature of the second coil and the temperature of the first coil;
determining a second adjusting parameter according to the comparison result of the first difference and the second difference;
adjusting the frequency of the fan or adjusting the opening of the bypass air valve according to the first adjusting parameter and the second adjusting parameter;
controlling the plurality of sensors to acquire the ambient temperature and a fourth coil temperature which is separated from the third coil temperature by a preset time, taking the second coil temperature as a new first coil temperature, taking the third coil temperature as a new second coil temperature, taking the fourth coil temperature as a new third coil temperature, and returning to the step of determining the corresponding dew point temperature according to the ambient temperature until the ambient temperature is less than the third coil temperature, or the ambient temperature is greater than the third coil temperature and the third coil temperature is within a first range;
the larger the opening of the bypass air valve is, the smaller the air quantity passing through the evaporator coil is;
according to the first adjusting parameter and the second adjusting parameter, in the step of adjusting the fan frequency, the method comprises the following steps:
and adjusting the fan frequency according to the preset frequency, the first adjusting parameter and the second adjusting parameter, wherein the product of the first adjusting parameter and the second adjusting parameter is in positive correlation with the fan frequency.
CN202010385994.9A 2020-05-09 2020-05-09 Control method and device for dehumidification heat pump Active CN111780269B (en)

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