CN112555997B - Fresh air handling unit and air outlet temperature and humidity control method thereof - Google Patents
Fresh air handling unit and air outlet temperature and humidity control method thereof Download PDFInfo
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- CN112555997B CN112555997B CN202011565291.0A CN202011565291A CN112555997B CN 112555997 B CN112555997 B CN 112555997B CN 202011565291 A CN202011565291 A CN 202011565291A CN 112555997 B CN112555997 B CN 112555997B
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0035—Indoor units, e.g. fan coil units characterised by introduction of outside air to the room
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0083—Indoor units, e.g. fan coil units with dehumidification means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—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
- 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
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
Abstract
The invention discloses a fresh air handling unit and an air outlet temperature and humidity accurate control method thereof. The control method comprises the steps of respectively and independently adjusting the temperature and the humidity of the fresh air according to the temperature and humidity detection result of the fresh air outlet, and then reheating the fresh air after the humidity adjustment to realize the accurate control of the outlet air temperature and humidity. The invention effectively realizes the respective adjustment of the outlet air temperature and humidity, and simultaneously adds the reheating function on the basis of cooling and dehumidification, thereby ensuring the accurate control of the outlet air temperature and humidity and ensuring the outlet air comfort level.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a fresh air handling unit and an air outlet temperature and humidity control method thereof.
Background
The high and large space building, especially the high and large space building that is located the traffic hub, its load has two characteristics, the latent heat load that personnel's high mobility leads to and the great change of sensible heat load ratio, another is personnel intensive and big to the new trend demand, and in addition different regions, different seasons, different weather, different periods of time etc. and the new trend import state has great difference, consequently need to guarantee accurate control air-out state point and have the wet processing ability of heat of wide range to the new trend unit of this kind of high and large space building characteristic design.
The existing cooling and dehumidifying mode is widely applied, but has the problems of high energy consumption, low air supply temperature and high relative humidity, and can not meet the requirement of accurate control of the temperature and the humidity of the air supply state point of the high and large space building. The method has the advantages that the specific solid adsorbent is used for removing water vapor in the air, the adsorbent needs to be continuously regenerated, the problems of high air outlet temperature, complex structure and inconvenience in use exist, sensible heat load in a building with a large space cannot be borne, and the use limitation is large.
Disclosure of Invention
The invention provides a fresh air handling unit and an air outlet temperature and humidity accurate control method thereof, and aims to solve the problem that the air outlet temperature and humidity cannot be accurately controlled by the existing fresh air handling unit.
The invention provides an air-out temperature and humidity control method for a fresh air unit, wherein the fresh air unit comprises a compressor, a condenser, a first electronic expansion valve and an evaporator which are sequentially connected in series, a branch is connected between an outlet pipeline of the compressor and an inlet pipeline of the evaporator in parallel, and a reheater and a second electronic expansion valve are arranged on the branch.
The control method comprises an air outlet moisture content control mode and an air outlet temperature control mode.
When the air outlet state simultaneously meets the air outlet moisture content control condition and the air outlet temperature control condition, the air outlet moisture content control mode is preferentially entered to operate.
When the air outlet state meets the air outlet moisture content control condition, entering an air outlet moisture content control mode, wherein the air outlet moisture content control condition is as follows: the actual air outlet moisture content is larger than the sum of the set moisture content d and the moisture content control precision delta d; when the air outlet state meets the air outlet temperature control condition, entering an air outlet temperature control mode, wherein the air outlet temperature control condition is as follows: the actual outlet air temperature is larger than the sum of the set temperature T and the temperature control precision Delta T.
And in the air outlet moisture content control mode, the air outlet moisture content is adjusted through the frequency of the compressor, and the air outlet temperature is controlled by adjusting the opening of the second electronic expansion valve to change the refrigerant flow of the reheater.
And the opening degree of the second electronic expansion valve is automatically adjusted according to the actual air outlet temperature and the set air outlet temperature.
The air outlet moisture content control mode comprises: and adjusting the frequency of the compressor or adjusting the number of running compressors according to the difference between the actual air outlet moisture content and the set air outlet moisture content.
In an embodiment, the outlet air moisture content control mode includes the following steps:
(11) calculating the humidity deviation value d of the fresh air outlet at intervals of delta t 1;
(12) the frequency of the compressor is adjusted according to the range of the humidity deviation value of the fresh air outlet:
when d is larger than or equal to 3 delta d, increasing the frequency of the compressor by f 1;
increasing the frequency of the compressor by f2 when delta d < 3 delta d;
when d is more than or equal to delta d, keeping the current frequency running;
when-3 delta d < -delta d, reducing the frequency of the compressor by f3 until the compressor keeps the lowest frequency operation;
when d is less than or equal to minus 3 delta d, reducing the frequency of the compressor by f4, and reducing the number of running compressors if frequency reduction is needed after the lowest running frequency of the compressor is reached until a single compressor is kept running;
wherein: and delta d is the moisture content control precision, the frequency rising value f1 is more than f2, and the frequency reduction value f3 is more than f 4.
The air-out temperature control mode includes: and adjusting the frequency of the compressor or adjusting the number of running compressors according to the difference value between the actual air outlet temperature and the set air outlet temperature.
In one embodiment, the outlet air temperature control mode includes the following steps:
(21) calculating an air outlet temperature deviation value T at intervals of delta T2;
(22) adjusting the frequency of the compressor according to the range of the deviation value of the outlet air temperature;
when T is more than or equal to 3 delta T, the frequency of the compressor is increased by f 11;
when T < 3T, the frequency of the compressor is increased by f 22;
when-delta T is less than or equal to T and less than or equal to delta T, keeping the current operation state;
when-3 DeltaT < T < -DeltaT, the frequency of the compressor is reduced by f33 until the compressor keeps operating at the lowest frequency;
when T is less than or equal to minus 3 delta T, the frequency of the compressor is reduced by f44, and when the lowest operation frequency of the compressor is reached and frequency reduction is needed, the number of the operated compressors is reduced until the operation of a single compressor is maintained;
wherein: the delta T is the temperature control precision, the frequency rising value f11 of the compressor is more than f22, and the frequency falling value f33 of the compressor is more than f 44.
Preferably, the method further comprises the step of precooling the fresh air before the fresh air enters the evaporator.
The invention also provides a fresh air handling unit, which adopts the air outlet temperature and humidity control method of any one of claims 1 to 11 to process fresh air.
Compared with the prior art, the invention has the following beneficial effects:
1. realize adjusting air-out temperature and humidity respectively effectively, increase the reheat function on the basis of cooling dehumidification simultaneously, ensure to carry out accurate control to the humidity and the temperature of air-out, guarantee the air-out comfort level.
2. The method is well suitable for the problem of large fluctuation of sensible heat load and latent heat load of the high and large space traffic building;
3. the precooler is arranged at the front end of dehumidification, so that the energy consumption of the fresh air handling unit is reduced.
Drawings
The invention is described in detail below with reference to the following figures and specific examples, wherein:
FIG. 1 is a system configuration diagram of a fresh air handling unit according to the present invention;
FIG. 2 is a system schematic of a fresh air handling unit of the present invention;
FIG. 3 is a temperature and humidity control flow chart of the fresh air handling unit of the present invention;
fig. 4 is a flowchart of reheat control in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and examples. It should be understood that the following specific examples are only for illustrating the present invention and are not to be construed as limiting the present invention.
As shown in fig. 1 and 2, the fresh air handling unit according to the present invention includes a compressor 1, a condenser 2, a first electronic expansion valve 4, an evaporator 6, and a gas-liquid separator 7, which are connected in sequence. A branch 17 is connected between the compressor outlet line and the evaporator inlet line, and the reheater 3 and the second electronic expansion valve 5 are connected in series on the branch. In order to reduce the energy consumption of the compressor, a precooler 8 is arranged at the front end of the evaporator to precool the fresh air.
In the above embodiment, the condenser 2 may use a flooded shell and tube heat exchanger to dissipate heat through the cooling tower 18. The precooler 8 adopts a fin coil type water-cooling heat exchanger, and supplies cooling water through a water-cooling centrifugal unit 19 to precool fresh air. The evaporator 6 uses a fin coil type air-cooled heat exchanger, and dehumidifies fresh air through refrigerant evaporation. The reheater uses fin coil type air-cooled heat exchanger, and the fresh air is heated by the exhaust refrigerant of the compressor. The fresh air is cooled by the precooler, dehumidified by the evaporator, heated by the reheater and sent into the room by the fan 20.
The compressor 1 adopts a variable frequency compressor, and the operation frequency can be automatically adjusted according to the difference of sensible heat load and latent heat load. The first electronic expansion valve 4 automatically adjusts the opening degree according to the suction superheat degree, and the second electronic expansion valve 5 automatically adjusts the opening degree according to the actual outlet air temperature and the set outlet air temperature.
Preferably, the precooler 8, the evaporator 6 and the reheater 3 are all provided with variable frequency fans, and the rotating speed of the fans can be adjusted according to different set air volumes.
The high-temperature and high-pressure gas discharged by the compressor 1 is partially changed into medium-temperature and high-pressure liquid after passing through the condenser 2, then is changed into low-temperature and low-pressure liquid after being subjected to pressure reduction by the first electronic expansion valve 4, enters the evaporator to exchange heat with fresh air, is evaporated into low-temperature and low-pressure gas, and then returns to the compressor for circulation. Part of high-temperature and high-pressure gas enters a reheater 3, exchanges heat with fresh air, is subjected to pressure reduction through a second electronic expansion valve 5 to become low-temperature and low-pressure liquid, and then enters an evaporator 6. The flow of the refrigerant entering the reheater is regulated by a second electronic expansion valve.
In order to monitor the operation of the system, a suction pressure sensor 9 and a suction temperature sensor 10 are arranged at the suction end of the compressor, and a discharge temperature sensor 11 and a discharge pressure sensor 12 are arranged at the discharge end of the compressor. The reheater 3 is provided with a humidity sensor 13 and a temperature sensor 14. The preheater 8 is provided with a temperature sensor 15 and a humidity sensor 16.
The fresh air treatment comprises three processes of precooling, dehumidification and reheating, wherein a precooler cools fresh air, an evaporator dehumidifies the fresh air through refrigerant evaporation, and a reheater heats the fresh air through part of high-temperature refrigerant discharged by a compressor.
As can be seen from the psychrometric chart, when the temperature of the air is reduced below the dew point during dehumidification to condense moisture in the air, the moisture content is reduced and the relative humidity is increased. After the reheating treatment is added, the air outlet temperature is improved, the humidity is reduced, and the air supply comfort level is ensured.
The fresh air treatment steps in the invention are as follows:
1. the fresh air passes through the precooler, exchanges heat with the chilled water in the precooler and then is cooled to remove the sensible heat of the fresh air;
2. the precooled fresh air passes through an evaporator, and because the evaporation temperature is lower than the dew point temperature of the air, water vapor in the fresh air is condensed on an evaporation tube, so that the latent heat of the fresh air is removed;
3. after two processes of cooling and dehumidifying, the fresh air is heated and the humidity is reduced through a reheater.
Fig. 3 is a temperature and humidity control flow chart of the fresh air handling unit according to the present invention. The temperature and humidity control comprises an air outlet moisture content control mode and an air outlet temperature control mode, and the operation mode of the fresh air handling unit is determined according to the air outlet state of the fresh air, namely the detection results of the temperature sensor 14 and the humidity sensor 13.
As shown in fig. 3, it is first determined whether the detected outlet air moisture content satisfies the dehumidification control condition, that is, whether the actual outlet air moisture content dout is less than or equal to the set moisture content dIs provided withAnd moisture content control accuracy ad,
dout≤dis provided withIf not, entering a moisture content control mode; if yes, judging whether the air outlet temperature control condition is met: whether the actual outlet air temperature Tout is less than or equal to the set temperature TIs provided withAnd the sum of the temperature control accuracy DeltaT, Tout = TIs provided withAnd if not, entering an air outlet temperature control mode, and if so, not starting the compressor and not entering the air outlet temperature control mode. When the moisture content of the fresh air inlet air is less than or equal to the sum of the set value and the moisture content control precision, and the temperature of the fresh air inlet air is less than or equal to the sum of the set value and the temperature control precision, the compressor in the unit is not started, and only the fan is started to operate.
And when the air outlet state point simultaneously meets the conditions of the two control modes, the air outlet moisture content control mode is preferentially entered. Only under the prerequisite that the air-out moisture content satisfied the requirement, the fresh air handling unit just can get into air-out temperature control mode.
The air outlet moisture content control mode comprises the following steps:
(11) calculating a moisture content deviation value d, d = d every time Δ t1Is provided with-dout, wherein dIs provided withThe set value of the outlet air humidity is adopted, and dout is the actual outlet air humidity;
(12) judging that air-out moisture content deviation value d falls into the interval scope, according to the interval difference, adjusting the frequency of compressor:
when d is larger than or equal to 3 delta d, increasing the frequency of the compressor by f 1;
increasing the frequency of the compressor by f2 when delta d < 3 delta d;
when d is more than or equal to delta d, keeping the current frequency running;
when-3 delta d < -delta d, reducing the frequency of the compressor by f3 until the lowest operation frequency of the compressor is reached, and keeping the lowest operation frequency;
when d is less than or equal to minus 3 delta d, the frequency of the compressor is reduced by f4, and after the lowest operation frequency of the compressor is reached, if frequency reduction is needed, the operation of one compressor is reduced, but the operation of a single compressor is maintained.
The above-mentioned Δ d is the moisture content control accuracy, and the smaller the Δ d is, the more accurate the outlet moisture content control is. The delta d value can be tested through experiments, but parameters can be set, and the delta d value can be adjusted according to the field load fluctuation condition. In actual use, the load fluctuation is large, the value of delta d can be adjusted to be large, the fluctuation is small, and the value of delta d can be adjusted to be small.
The compressor raising frequency value f1 is more than f2, and the compressor lowering frequency value f3 is more than f 4. In an embodiment, f1=5Hz, f2=2Hz, f3=2Hz, f4=5 Hz.
In the air outlet moisture content control mode, the frequency of the compressor is used for adjusting the air outlet moisture content, and the second electronic expansion valve achieves the purpose of controlling the air outlet temperature by changing the flow of the refrigerant of the reheater.
The air-out moisture content control mode further comprises: when the fresh air after being processed with moisture content meets the moisture content requirement, detecting whether the moisture content and the temperature of the inlet air of the fresh air meet the requirement that din is less than or equal to dIs provided withT is less than or equal to +tand and TinIs provided withAnd if the +/-Delta T is met, stopping the operation of the compressor, otherwise, returning to the air outlet moisture content control mode again. This is because moisture control continues for a period of time, with fresh air entering constantly.
The air outlet temperature control mode comprises the following steps:
(21) calculating an air outlet temperature deviation value T once every time delta T2, wherein T = TIs provided with-Tout, wherein,
Tis provided withThe set value of the air outlet temperature is Tout, and the actual air outlet temperature is Tout;
(22) judging that the air-out temperature deviation value T falls into the interval scope, according to the interval difference, adjusting the compressor frequency:
when T is more than or equal to 3 delta T, increasing the frequency of the compressor by f 11;
increasing the compressor frequency by f22 when Δ T < 3 Δ T;
when-delta T is less than or equal to T and less than or equal to delta T, keeping the current frequency operation state;
when-3 delta T < -delta T, reducing the frequency of the compressor by f33 until the lowest operation frequency of the compressor is reached, and keeping the lowest operation frequency;
when T is less than or equal to minus 3 delta T, reducing the frequency of the compressor by f44, stopping one compressor if frequency reduction is needed after the lowest operation frequency of the compressor is reached, and keeping the single compressor to operate;
wherein, the smaller the Delta T is, the more accurate the control of the outlet air temperature is; the compressor raising frequency value f11 is more than f22, and the compressor lowering frequency value f33 is more than f 44. In one embodiment f1=3Hz, f2=1Hz, f3=1Hz, f4=3 Hz.
Under the air-out temperature control mode, carry out preliminary regulation to the air-out temperature through compressor frequency, carry out accurate regulation to the air-out temperature through the aperture of second electronic expansion valve.
The humidity of the fresh air after the air outlet temperature control is not satisfactory (although the humidity is very little), at the moment, whether the air outlet moisture content satisfies dout ≤ d needs to be judgedIs provided withAnd if not, entering an air outlet moisture content control mode, and carrying out moisture content treatment on the fresh air after the air outlet temperature is controlled.
The air-out temperature control mode still includes: when the temperature-treated fresh air meets the requirement of the outlet air temperature, detecting whether the moisture content and the temperature of the inlet air of the fresh air meet the requirement that din is less than or equal to dIs provided withT is less than or equal to +tand and TinIs provided withAnd if the positive delta T is met, stopping the operation of the compressor, otherwise, returning to the air outlet temperature control mode again for processing. This is because temperature control continues for a period of time, with fresh air entering constantly.
As shown in fig. 4, the control of the reheater refrigerant flow rate in the present invention includes: detecting the temperature of the fresh air outlet; calculating a deviation value between the actual air outlet temperature and the set air outlet temperature; calculating the step number adjusting value of the second electronic expansion valve; and changing the flow of a reheater refrigerant and adjusting the air outlet temperature.
According to the fresh air handling unit, two processes of air cooling and dehumidification are independent, moisture content control is preferentially carried out on air, then air outlet temperature control is carried out on the air, and meanwhile a reheating function is added on the basis of cooling and dehumidification, so that accurate control over the air outlet temperature is achieved, and the air outlet comfort level is guaranteed. In addition, the invention also adds the precooling treatment to the fresh air, thereby further reducing the energy consumption.
The foregoing is considered as illustrative only of the embodiments of the invention. It should be understood that any modifications, equivalents and changes made within the spirit and framework of the inventive concept are intended to be included within the scope of the present invention.
Claims (12)
1. The utility model provides a fresh air unit air-out atmospheric control method, fresh air unit includes compressor, condenser, first electronic expansion valve and the evaporimeter that connects gradually in series, a branch road is connected in parallel between compressor outlet pipeline and the evaporimeter inlet pipeline, is equipped with re-heater and second electronic expansion valve on this branch road, its characterized in that, the control method include:
independently adjusting the temperature and the humidity of the fresh air according to the temperature and humidity detection result of the fresh air outlet;
when the fresh air subjected to air outlet temperature control meets the temperature requirement, judging whether the air outlet moisture content is less than or equal to the sum of the set moisture content and the moisture content control precision, if not, entering an air outlet moisture content control mode, and carrying out moisture content treatment on the fresh air subjected to air outlet temperature control;
and when the fresh air after moisture content processing and temperature processing meets the requirements of the outlet air temperature and humidity, detecting whether the moisture content of the inlet air of the fresh air is less than or equal to the sum of the set moisture content and the moisture content control precision and whether the temperature of the inlet air is less than or equal to the sum of the set temperature and the temperature control precision, and if not, returning to the outlet air moisture content control mode and/or the outlet air temperature control mode again for operation.
2. The control method according to claim 1, wherein the control method comprises an outlet air moisture content control mode and an outlet air temperature control mode.
3. The control method according to claim 2, wherein when the outlet air state satisfies both the outlet air moisture content control condition and the outlet air temperature control condition, the outlet air moisture content control mode is preferentially entered for operation.
4. The control method according to claim 2 or 3, characterized in that when the outlet air state meets the outlet air moisture content control condition, the inlet outlet air moisture content control is performedAnd the mode, the outlet air moisture content control condition is as follows: the actual outlet air moisture content is larger than the set moisture content dIs provided withAnd the sum of moisture content control accuracy Δ d; when the air outlet state meets the air outlet temperature control condition, entering an air outlet temperature control mode, wherein the air outlet temperature control condition is as follows: the actual outlet air temperature is greater than the set temperature TIs provided withAnd temperature control accuracy Δ T.
5. The control method of claim 2, wherein in the outlet moisture content control mode, the outlet moisture content is adjusted by the compressor frequency, and the outlet temperature is controlled by adjusting the opening of the second electronic expansion valve to change the refrigerant flow of the reheater.
6. The control method of claim 5, wherein the outlet moisture content control mode comprises: and adjusting the frequency of the compressor or adjusting the number of running compressors according to the difference between the actual air outlet moisture content and the set air outlet moisture content.
7. The control method according to claim 5, wherein the second electronic expansion valve automatically adjusts the opening degree according to the actual outlet air temperature and the set outlet air temperature.
8. The control method of claim 6, wherein the outlet moisture control mode comprises the steps of:
(11) calculating the humidity deviation value d of the fresh air outlet at intervals of delta t 1;
(12) the frequency of the compressor is adjusted according to the range of the humidity deviation value of the fresh air outlet:
when d is larger than or equal to 3 delta d, increasing the frequency of the compressor by f 1;
increasing the frequency of the compressor by f2 when delta d < 3 delta d;
when d is more than or equal to delta d, keeping the current frequency running;
when-3 Deltad < d < -Deltad, the compressor frequency is reduced by f3 until the compressor remains at its maximum
Running at low frequency;
when d is less than or equal to-3 delta d, the frequency of the compressor is reduced by f4 to reach the lowest running frequency of the compressor
Then, if frequency reduction is needed, the number of running compressors is reduced until the single compressor is kept running;
wherein: and delta d is the moisture content control precision, the frequency rising value f1 is more than f2, and the frequency reduction value f3 is more than f 4.
9. The control method according to claim 2, wherein the outlet air temperature control mode includes: and adjusting the frequency of the compressor or adjusting the number of running compressors according to the difference value between the actual air outlet temperature and the set air outlet temperature.
10. The control method according to claim 9, wherein the outlet air temperature control mode includes the steps of:
(21) calculating an air outlet temperature deviation value T at intervals of delta T2;
(22) adjusting the frequency of the compressor according to the range of the deviation value of the outlet air temperature;
when T is more than or equal to 3 delta T, the frequency of the compressor is increased by f 11;
when T < 3T, the frequency of the compressor is increased by f 22;
when-delta T is less than or equal to T and less than or equal to delta T, keeping the current operation state;
when-3 DeltaT < T < [ DeltaT ], the compressor frequency is reduced by f33 until the compressor remains at its maximum
The operation is carried out until the lowest frequency is kept;
when T is less than or equal to minus 3 delta T, the frequency of the compressor is reduced by f44 to reach the lowest running frequency of the compressor
Then, if the frequency is reduced, reducing the number of the running compressors until the running of a single compressor is kept;
wherein: the delta T is the temperature control precision, the frequency rising value f11 of the compressor is more than f22, and the frequency falling value f33 of the compressor is more than f 44.
11. The control method of claim 1, further comprising pre-cooling the fresh air prior to entering the evaporator.
12. A fresh air handling unit, characterized in that the fresh air handling unit processes fresh air by using the outlet air temperature and humidity control method according to any one of claims 1 to 11.
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| CN113685961B (en) * | 2021-08-12 | 2022-09-20 | 南京天加环境科技有限公司 | Control method for transitional season refrigeration energy conservation of constant-temperature and constant-humidity air conditioning unit |
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| US6381970B1 (en) * | 1999-03-05 | 2002-05-07 | American Standard International Inc. | Refrigeration circuit with reheat coil |
| CN102494372B (en) * | 2011-12-21 | 2013-08-14 | 南京五洲制冷集团有限公司 | Double-cold source full fresh air dehumidifier and control method thereof |
| CN106969436A (en) * | 2017-05-11 | 2017-07-21 | 钹特环保科技（上海）有限公司 | A kind of Novel condensation dehumidifying unit |
| CN107975869B (en) * | 2017-10-27 | 2020-11-03 | 国安瑞（北京）科技有限公司 | Air conditioning system |
| CN108679870A (en) * | 2018-06-20 | 2018-10-19 | 江苏三六五室内环境科技有限公司 | A kind of warm and humid sub-control air-conditioning system with Fresh air handing function |
| CN110925876A (en) * | 2019-12-16 | 2020-03-27 | 湖南红橡室内气候技术有限公司 | Serial-type single cold heat source fresh air humidifying unit |
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