CN113418247A - Full fresh air dehumidifier and method for controlling evaporator load by dew point temperature - Google Patents
Full fresh air dehumidifier and method for controlling evaporator load by dew point temperature Download PDFInfo
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- CN113418247A CN113418247A CN202110684675.2A CN202110684675A CN113418247A CN 113418247 A CN113418247 A CN 113418247A CN 202110684675 A CN202110684675 A CN 202110684675A CN 113418247 A CN113418247 A CN 113418247A
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- 238000000034 method Methods 0.000 title claims abstract description 9
- 239000007788 liquid Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
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Classifications
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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
- F24F3/1411—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 absorbing or adsorbing water, e.g. using an hygroscopic desiccant
-
- 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
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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
- 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
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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)
- Central Air Conditioning (AREA)
- Air Conditioning Control Device (AREA)
- Drying Of Gases (AREA)
Abstract
A dehumidifier with full fresh air and method for controlling evaporator load by dew point temperature, wherein the dehumidifier comprises an evaporator group, the evaporator group comprises a plurality of evaporators, the inlet ends of all the evaporators are connected with capillary tubes and evaporator access tubes connected with the capillary tubes, one evaporator access tube is provided with a first thermostatic expansion valve, and the other evaporator access tubes are provided with a second thermostatic expansion valve and an evaporator solenoid valve simultaneously; and the controller is connected with all the evaporator electromagnetic valves, determines the heat exchange quantity and the dew point difference under the current air inlet parameters from a preset air inlet temperature and humidity, an air inlet moisture content, an air inlet dew point, a set air outlet temperature and humidity, a set air outlet moisture content, a set air outlet dew point, a dew point difference value and a heat exchange quantity calculation relation table according to the current air inlet parameters, and controls the opening quantity of the evaporator electromagnetic valves according to the dew point difference value. According to the invention, the dehumidifier is controlled to use a reasonable number of evaporators to match different compressor loads, so that the heat exchange area of the evaporators is reasonably controlled.
Description
Technical Field
The invention relates to a full fresh air dehumidifier, in particular to a full fresh air dehumidifier and a method for roughly controlling evaporator load by dew point temperature.
Background
The common fresh air temperature-adjusting dehumidifier adopts a single evaporator and an electronic expansion valve to control the heat load of the evaporator, and because the load change of the fresh air dehumidifier is large, the difference of heat exchange areas required at full load and low load is large, and the unit is adversely affected by the adoption of the single evaporator when the load is low, and the heat exchange area is too large; meanwhile, the electronic expansion valve is expensive in the actual production process.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a full fresh air dehumidifier with dew point temperature for roughly controlling evaporator load, the unit adopts a plurality of evaporators and thermostatic expansion valves which are grouped, and the problems that the unit is adversely affected due to overlarge heat exchange area when a single evaporator is adopted at low load, an electronic expansion valve is expensive and the like are solved.
A full fresh air dehumidifier with dew point temperature control evaporator load comprises:
the unit comprises an evaporator group, the evaporator group comprises a plurality of evaporators, the inlet ends of all the evaporators are connected with capillary tubes and evaporator access tubes which are connected with the capillary tubes and can be communicated with the outlets of the water-cooled condensers, one evaporator access tube is provided with a first thermostatic expansion valve, and the other evaporator access tubes are simultaneously provided with a second thermostatic expansion valve and an evaporator solenoid valve for controlling the second thermostatic expansion valve to be closed;
and the controller is connected with all the evaporator electromagnetic valves, determines the heat exchange quantity and the dew point difference under the current air inlet parameters from a preset air inlet temperature and humidity, an air inlet moisture content, an air inlet dew point, a set air outlet temperature and humidity, a set air outlet moisture content, a set air outlet dew point, a dew point difference value and a heat exchange quantity calculation relation table according to the current air inlet parameters, and controls the opening quantity of the evaporator electromagnetic valves according to the dew point difference value.
In the technical scheme, the dehumidifier is controlled to use a reasonable number of evaporators to match different compressor loads, so that the heat exchange area of the evaporators is reasonably controlled under different compressor loads, the influence on the dehumidifier unit is reduced, and meanwhile, the cost is lower in a controllable way by adopting the thermal expansion valve to replace an electronic expansion valve.
Preferably, when the dew point difference is greater than 10 ℃, the controller controls all the evaporator electromagnetic valves to be opened, when the dew point difference is greater than 4 ℃ and less than 10 ℃, the controller controls N evaporator electromagnetic valves to be opened, N is greater than or equal to 1 and less than the total number of the evaporator electromagnetic valves, and when the dew point difference is less than 4 ℃, all the evaporator electromagnetic valves are controlled to be closed.
Preferably, a bypass pipeline connected with the evaporator access pipe is arranged behind the first thermostatic expansion valve, the other end of the bypass pipeline is used for being connected to an outlet of the compressor, and a hot gas bypass valve and a bypass electromagnetic valve electrically connected with the controller are arranged on the bypass pipeline.
Preferably, the controller controls all the electromagnetic valves of the evaporator to be closed when the temperature of the air inlet dry bulb is less than 16 ℃.
Preferably, the dehumidifier also comprises an air-cooled condenser connected with the outlet of the water-cooled condenser, and the evaporator group and the air-cooled condenser are sequentially arranged on an air inlet path of the fresh air dehumidifier.
The invention also discloses a method for controlling the load of the evaporator by the dew point temperature, which is suitable for the all fresh air dehumidifier in any technical scheme and comprises the following steps: according to the current air inlet parameters, determining the heat exchange quantity and the dew point difference under the current air inlet parameters from a preset air inlet temperature and humidity, an air inlet moisture content, an air inlet dew point, a set air outlet temperature and humidity, a set air outlet moisture content, a set air outlet dew point, a dew point difference value and a heat exchange quantity calculation relation table, and controlling the opening quantity of the electromagnetic valves according to the difference value.
Preferably, when the dew point difference is greater than 10 ℃, the controller controls all the evaporator electromagnetic valves to be opened, when the dew point difference is greater than 4 ℃ and less than 10 ℃, the controller controls N evaporator electromagnetic valves to be opened, N is greater than or equal to 1 and less than the total number of the evaporator electromagnetic valves, and when the dew point difference is less than 4 ℃, all the evaporator electromagnetic valves are controlled to be closed.
In conclusion, the invention has the following beneficial effects:
1: the dehumidifier is controlled to use a reasonable number of evaporators to match different compressor loads, so that the heat exchange area of the evaporators is reasonably controlled under different compressor loads, the influence on the dehumidifier unit is reduced, and meanwhile, the cost can be controlled to be lower by adopting the thermal expansion valve to replace an electronic expansion valve.
Drawings
FIG. 1 is a schematic diagram of a new air dehumidifier with dew point temperature to control evaporator load;
FIG. 2 is a table of Hansche RC2-180B compressor calculations.
Detailed Description
The invention will be further explained by means of specific embodiments with reference to the drawings.
Example (b): as shown in fig. 1-2, a full fresh air dehumidifier with dew point temperature controlling evaporator load comprises a unit, the unit comprises an evaporator group, the evaporator group comprises a plurality of evaporators 1, the evaporators 1 are used for exchanging heat with outside air to achieve the refrigeration effect, the inlet ends of all the evaporators 1 are connected with capillary tubes 2 and evaporator access tubes 3 connected with the capillary tubes 2, the evaporator access tubes 3 can be communicated with the outlet of a water-cooled condenser to receive high-temperature and high-pressure liquid refrigerant flowing out from the outlet of the water-cooled condenser, one evaporator access tube 3 is provided with a first thermostatic expansion valve 41, the other evaporator access tubes 3 are simultaneously provided with a second thermostatic expansion valve 42 and an evaporator electromagnetic valve 5 for controlling the second thermostatic expansion valve 42 to be opened and closed, after the high-temperature and high-pressure liquid refrigerant is throttled and depressurized by the first thermostatic expansion valve 41 and the second thermostatic expansion valve 42, the mixture becomes a low-temperature low-pressure vapor-liquid mixture which is easy to evaporate, and the mixture enters the evaporator 1 to evaporate, so that the evaporator 1 absorbs external heat;
the dehumidifier air inlet heat exchanger further comprises a controller, the controller is connected with all the evaporator electromagnetic valves 5, the heat exchange quantity and the dew point difference under the current air inlet parameters are determined from a preset air inlet temperature and humidity, an air inlet moisture content, an air inlet dew point, an air outlet temperature and humidity, an air outlet moisture content, an air outlet dew point, a dew point difference and a heat exchange quantity calculation relation table according to the current air inlet parameters, the opening number of the evaporator electromagnetic valves 5 is controlled according to the dew point difference, the calculation relation table refers to a Chinese clock RC2-180B compressor calculation table shown in figure 2, the air inlet parameters can be the air inlet temperature and humidity, the air inlet moisture content, the air inlet dew point and other parameters, the air inlet parameters are measured by a sensor arranged at the air inlet position of the dehumidifier, when the dew point difference is more than 10 ℃, the controller controls all the evaporator electromagnetic valves 5 to be opened, when the dew point difference is more than 4 ℃ and less than 10 ℃, the controller controls the N evaporator electromagnetic valves 5 to be opened, n is more than or equal to 1 and less than the total number of the evaporator electromagnetic valves 5, and when the dew point difference is less than 4 ℃, all the evaporator electromagnetic valves 5 are controlled to be closed. In the technical scheme, the dehumidifier is controlled to use a reasonable number of evaporators 1 to match different compressor loads, so that the heat exchange area of the evaporators 1 is reasonably controlled under different compressor loads, the influence on the dehumidifier unit is reduced, and meanwhile, the cost is lower in a controllable way by adopting the thermal expansion valve to replace an electronic expansion valve.
In order to prevent the evaporator from freezing under low load, a bypass pipeline 6 connected with the evaporator access pipe 3 is arranged behind the thermostatic expansion valve 41, the other end of the bypass pipeline 6 is used for being connected to the outlet of the compressor, and a hot gas bypass valve 7 and a bypass electromagnetic valve 8 electrically connected with the controller are arranged on the bypass pipeline 6. Therefore, high-temperature and high-pressure hot gas bypassed from the high-pressure side enters the evaporator, the load of the evaporator is increased, the possibility that the evaporator is frozen due to the reduction of the evaporation pressure of the evaporator can be prevented, the outlet temperature and the pressure of the evaporator are increased, and the operation condition of the compressor under low-temperature operation is improved.
In the dehumidifier industry, not only the dew point temperature but also the dry bulb temperature are involved; when the temperature of the air inlet dry bulb is less than 16 ℃, the controller controls all the electromagnetic valves 5 of the evaporator to be closed, and the temperature of the dry bulb can be read on a dry bulb temperature meter which is exposed in the air and is not directly irradiated by the sun.
Preferably, the dehumidifier also comprises an air-cooled condenser connected with the outlet of the water-cooled condenser, the evaporator group and the air-cooled condenser are sequentially arranged on an air inlet path of the fresh air dehumidifier, and the temperature is reduced twice, so that the cooling effect is good.
Example 2: the invention also discloses a method for controlling the load of the evaporator by the dew point temperature, which is suitable for the full fresh air dehumidifier in the embodiment, and the method comprises the following steps: according to the current air inlet parameters, determining the heat exchange quantity and the dew point difference under the current air inlet parameters from a preset air inlet temperature and humidity, an air inlet moisture content, an air inlet dew point, a set air outlet temperature and humidity, a set air outlet moisture content, a set air outlet dew point, a dew point difference value and a heat exchange quantity calculation relation table, and controlling the opening quantity of the electromagnetic valves according to the difference value. When the dew point difference is larger than 10 ℃, the controller controls all the evaporator electromagnetic valves 5 to be opened, when the dew point difference is larger than 4 ℃ and smaller than 10 ℃, the controller controls N evaporator electromagnetic valves 5 to be opened, N is larger than or equal to 1 and smaller than the total number of the evaporator electromagnetic valves 5, and when the dew point difference is smaller than 4 ℃, all the evaporator electromagnetic valves 5 are controlled to be closed.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical solutions of the present invention may be made by those skilled in the art without departing from the design concept of the present invention, and the technical contents of the present invention are all described in the claims.
Claims (7)
1. The utility model provides a full fresh air dehumidifier of dew point temperature control evaporimeter load which characterized in that includes:
the unit comprises an evaporator group, the evaporator group comprises a plurality of evaporators (1), the inlet ends of all the evaporators (1) are connected with capillary tubes (2) and evaporator access tubes (3) which are connected with the capillary tubes (2) and can be communicated with the outlets of the water-cooled condensers, one evaporator access tube (3) is provided with a first thermostatic expansion valve (41), and the other evaporator access tubes (3) are simultaneously provided with a second thermostatic expansion valve (42) and an evaporator electromagnetic valve (5) for controlling the second thermostatic expansion valve (42) to be communicated;
and the controller is connected with all the evaporator electromagnetic valves (5), determines the heat exchange quantity and the dew point difference under the current air inlet parameter from a preset air inlet temperature and humidity, an air inlet moisture content, an air inlet dew point, an air outlet temperature and humidity, an air outlet moisture content, an air outlet dew point, a dew point difference value and a heat exchange quantity calculation relation table according to the current air inlet parameter, and controls the opening quantity of the evaporator electromagnetic valves (5) according to the dew point difference value.
2. The dehumidifier with dew point temperature for controlling evaporator load according to claim 1, wherein the controller controls all the evaporator solenoid valves (5) to be opened when the dew point difference is greater than 10 ℃, controls N of the evaporator solenoid valves (5) to be opened when the dew point difference is greater than 4 ℃ and less than 10 ℃, controls N of the evaporator solenoid valves (5) to be opened, and controls all the evaporator solenoid valves (5) to be closed when the dew point difference is less than 4 ℃.
3. The full fresh air dehumidifier with dew point temperature control evaporator load according to claim 1, wherein a bypass pipeline (6) connected with the evaporator access pipe (3) is arranged behind the thermostatic expansion valve (41), the other end of the bypass pipeline (6) is used for being connected to the outlet of the compressor, and a hot air bypass valve (7) and a bypass electromagnetic valve (8) electrically connected with the controller are arranged on the bypass pipeline (6).
4. The full fresh air dehumidifier with dew point temperature controlled evaporator load as claimed in claim 1, wherein said controller controls all evaporator solenoid valves (5) to close when the temperature of the inlet air dry bulb is less than 16 ℃.
5. The dehumidifier with dew point temperature control evaporator load as claimed in claim 1, further comprising an air-cooled condenser connected to the outlet of the water-cooled condenser, wherein the evaporator set and the air-cooled condenser are sequentially arranged on the air intake path of the dehumidifier.
6. A method for controlling evaporator load by dew point temperature, which is applied to the full fresh air dehumidifier of any one of claims 1-5, and is characterized by comprising the following steps:
according to the current air inlet parameters, determining the heat exchange quantity and the dew point difference under the current air inlet parameters from a preset air inlet temperature and humidity, an air inlet moisture content, an air inlet dew point, a set air outlet temperature and humidity, a set air outlet moisture content, a set air outlet dew point, a dew point difference value and a heat exchange quantity calculation relation table, and controlling the opening quantity of the electromagnetic valves according to the difference value.
7. A method for controlling the load of an evaporator (1) with dew point temperature according to claim 5, characterized in that the controller controls all the evaporator solenoid valves (5) to be opened when the dew point difference is larger than 10 ℃, controls N of the evaporator solenoid valves (5) to be opened when the dew point difference is larger than 4 ℃ and smaller than 10 ℃, controls N of the evaporator solenoid valves (5) to be opened, and controls all the evaporator solenoid valves (5) to be closed when the dew point difference is smaller than 4 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110684675.2A CN113418247A (en) | 2021-06-21 | 2021-06-21 | Full fresh air dehumidifier and method for controlling evaporator load by dew point temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110684675.2A CN113418247A (en) | 2021-06-21 | 2021-06-21 | Full fresh air dehumidifier and method for controlling evaporator load by dew point temperature |
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| CN113418247A true CN113418247A (en) | 2021-09-21 |
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| CN202110684675.2A Pending CN113418247A (en) | 2021-06-21 | 2021-06-21 | Full fresh air dehumidifier and method for controlling evaporator load by dew point temperature |
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Cited By (2)
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| CN116841336A (en) * | 2023-07-03 | 2023-10-03 | 江苏拓米洛高端装备股份有限公司 | Control method, device and system of test box and test box |
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| CN114777293A (en) * | 2022-03-21 | 2022-07-22 | 青岛海尔空调器有限总公司 | Method and device for controlling variable-frequency dehumidifier, electronic equipment and storage medium |
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| CN116841336A (en) * | 2023-07-03 | 2023-10-03 | 江苏拓米洛高端装备股份有限公司 | Control method, device and system of test box and test box |
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Application publication date: 20210921 |