CN107702284B - Constant temperature and humidity system and control method thereof - Google Patents
Constant temperature and humidity system and control method thereof Download PDFInfo
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- CN107702284B CN107702284B CN201710930303.7A CN201710930303A CN107702284B CN 107702284 B CN107702284 B CN 107702284B CN 201710930303 A CN201710930303 A CN 201710930303A CN 107702284 B CN107702284 B CN 107702284B
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000001816 cooling Methods 0.000 claims description 28
- 238000007791 dehumidification Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 230000001131 transforming effect Effects 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 9
- 238000004378 air conditioning Methods 0.000 abstract description 6
- 238000007664 blowing Methods 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
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Abstract
The invention discloses a constant temperature and humidity system and a control method thereof, belongs to the technical field of air conditioning systems, and is designed for solving the problems of high energy consumption and the like in the prior art. The control method of the constant temperature and humidity system measures the actual room temperature T1MeasuringAnd actual indoor dew point temperature T2Measuring(ii) a According to the actual room temperature T1MeasuringAnd the set blowing temperature T1Is provided with△ T1 vs T1Is provided withAnd (3) correcting: t1School＝T1Is provided with+f(△T1),△T1>0, f (△ T1)<0，△T1<0, f (△ T1)>0; according to the actual indoor dew point temperature T2MeasuringAnd set air supply dew point temperature T2Is provided with△ T2 vs T2Is provided withAnd (3) correcting: t2School＝T2Is provided with+F(△T2),△T2>0, F (△ T2)<0，△T2<0, F (△ T2)>0. The constant temperature and humidity system and the control method thereof provided by the invention have low energy consumption.
Description
Technical Field
The utility model relates to an air conditioning system technical field especially relates to a constant temperature and humidity system and control method thereof.
Background
At present, the application occasions of the constant temperature and humidity air conditioning system are increasing, for example, in the fields of electronics, hospitals, metering, textile, optical instruments and the like, so as to ensure that some products or operations are in a constant temperature and humidity environment.
However, the current constant temperature and humidity system has the following problems:
when the indoor temperature rises or falls, the set air supply temperature of a fresh air conditioning unit of the constant temperature and humidity system cannot change, so that the energy consumption of refrigeration or heating is increased; when the indoor dew point temperature rises or falls, the set air supply dew point of a fresh air conditioning unit of the constant temperature and humidity system cannot change, so that the energy consumption of dehumidification or humidification is increased.
Disclosure of Invention
One purpose of the invention is to provide a control method of a constant temperature and humidity system with low energy consumption;
the invention also aims to provide a constant temperature and humidity system with low energy consumption.
To achieve the purpose, on one hand, the invention adopts the following technical scheme:
a control method of a constant temperature and humidity system comprises the following steps:
measuring actual room temperature T1 in constant temperature and humidity chamberMeasuringAnd actual indoor dew point temperature T2Measuring；
According to the actual room temperature T1MeasuringThe set air supply temperature T1 of the air supply part of the constant temperature and humidity systemIs provided with△ T1 vs T1Is provided withAnd (3) correcting: t1School＝T1Is provided with+ f (△ T1), wherein △ T1 ═ T1Measuring-T1Is provided with，△T1>0, f (△ T1)<0，△T1<0, f (△ T1)>0，T1SchoolSetting the corrected air supply temperature for the air supply part;
according to the actual indoor dew point temperature T2MeasuringThe set air supply dew point temperature T2 of the air supply part of the constant temperature and humidity systemIs provided with△ T2 vs T2Is provided withAnd (3) correcting: t2School＝T2Is provided with+ F (△ T2), wherein △ T2 ═ T2Measuring-T2Is provided with，△T2>0, F (△ T2)<0，△T2<0, F (△ T2)>0，T2SchoolAnd setting the air supply dew point temperature after the air supply part is corrected.
Further, F (△ T1) and F (△ T2) are calculated by PID respectively by the controller.
Further, when the constant temperature and humidity system is refrigerating, the set air supply temperature after the air supply part is corrected is T1School，
When the constant temperature and humidity system heats, the set air supply temperature after the air supply part is corrected is T1'School，T1’School＝T1SchoolFirst dead zone temperature, 0<The first dead zone temperature is less than or equal to 1 ℃;
when the constant temperature and humidity system dehumidifies, the set air supply dew point temperature after the air supply part is corrected is T2School，
When the constant temperature and humidity system is used for humidification, the set air supply dew point temperature after the air supply part is corrected is T2'School，T2’School＝T2School-second dead zone temperature, 0<The second dead zone temperature ≦ 1 ℃.
Further, the constant temperature and humidity system comprises a cooling unit, and when the constant temperature and humidity system is used for cooling and dehumidifying, the constant temperature and humidity system cools and dehumidifies through the cooling unit; the cooling unit comprises a first heat exchange tube and a second heat exchange tube arranged on the first heat exchange tubeA first control valve on the first heat exchange pipe according to the T1SchoolAnd said T2SchoolWhen the first control valve has different opening degree change values, the controller controls the first control valve to have the opening degree change value T1SchoolAnd said T2SchoolThe opening degree change of the first control valve is controlled by making the opening degree change value of the first control valve larger.
On the other hand, the invention adopts the following technical scheme:
a constant temperature and humidity system comprises a controller, and a temperature adjusting part, a humidity adjusting part, an air supply part, an indoor temperature sensor and an indoor dew point temperature sensor which are respectively connected with the controller;
the air supply part is used for supplying air processed by the temperature adjusting part and the humidity adjusting part into the constant temperature and humidity chamber, and the set air supply temperature of the air supply part is T1Is provided withThe set blow dew point temperature of the blow part is T2Is provided withThe indoor temperature sensor and the indoor dew point temperature sensor are respectively used for measuring the actual room temperature T1 in the constant temperature and humidity roomMeasuringAnd actual indoor dew point temperature T2Measuring；
The controller is used for controlling the power supply according to T1MeasuringAnd T1Is provided with△ T1 vs T1Is provided withCorrection and according to T2MeasuringAnd T2Is provided with△ T2 vs T2Is provided withPerforming a correction, wherein:
T1school＝T1Is provided with+ f (△ T1), wherein △ T1 ═ T1Measuring-T1Is provided with，△T1>0, f (△ T1)<0，△T1<0, f (△ T1)>0，T1SchoolFor the corrected set air supply temperature of the air supply part,
T2school＝T2Is provided with+ F (△ T2), wherein △ T2 ═ T2Measuring-T2Is provided with，△T2>0, F (△ T2)<0，△T2<0, F (△ T2)>0，T2SchoolAnd setting the air supply dew point temperature after the air supply part is corrected.
Further, F (△ T1) and F (△ T2) are calculated by PID respectively by the controller.
Further, the humidity adjusting part includes a cooling unit and a humidifier respectively connected to the controller; when the constant temperature and humidity system is used for dehumidification, the controller closes the humidifier and controls the cooling unit to work; when the constant temperature and humidity system is used for humidifying, the controller controls the cooling unit to be closed and controls the humidifier to work.
Further, when the constant temperature and humidity system is used for cooling and dehumidifying, the constant temperature and humidity system cools and dehumidifies through the cooling unit;
the cooling unit comprises a first heat exchange pipe and a first control valve arranged on the first heat exchange pipe, and is respectively arranged according to the T1SchoolAnd said T2SchoolWhen the first control valve has different opening degree change values, the controller controls the first control valve to have the opening degree change value T1SchoolAnd said T2SchoolThe opening degree change of the first control valve is controlled by making the opening degree change value of the first control valve larger.
Further, constant temperature and humidity system still includes fresh air pipe and return air portion, fresh air pipe with the air outlet of return air portion equally divide respectively with the air intake of temperature regulation portion and the air intake intercommunication of humidity control portion.
Further, a filtering structure is arranged in the fresh air pipe.
The invention has the following beneficial effects:
according to the constant temperature and humidity system and the control method thereof provided by the invention, the set air supply temperature and the set air supply dew point temperature are not fixed, but the set value is corrected and automatically adjusted based on the difference value between the actual room temperature and the actual room dew point temperature and the set value, closed-loop automatic control is adopted, the high-energy-consumption operation of the constant temperature and humidity system is avoided, and the overall operation cost is low.
Drawings
Fig. 1 is a schematic diagram of a control method of a constant temperature and humidity system according to a preferred embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
The first preferred embodiment:
the preferred embodiment provides a control method of a constant temperature and humidity system, which specifically comprises the following steps:
measuring actual room temperature T1 in constant temperature and humidity chamberMeasuringAnd actual indoor dew point temperature T2Measuring；
According to the actual room temperature T1MeasuringThe set air supply temperature T1 of the air supply part of the constant temperature and humidity systemIs provided with△ T1 vs T1Is provided withAnd (3) correcting: t1School＝T1Is provided with+ f (△ T1), wherein △ T1 ═ T1Measuring-T1Is provided with，△T1>0, f (△ T1)<0，△T1<0, f (△ T1)>0，T1SchoolSetting the corrected air supply temperature for the air supply part;
according to the actual indoor dew point temperature T2MeasuringThe set air supply dew point temperature T2 of the air supply part of the constant temperature and humidity systemIs provided with△ T2 vs T2Is provided withAnd (3) correcting: t2School＝T2Is provided with+ f (△ T2), wherein △ T2 ═ T2Measuring-T2Is provided with，△T2>0, f (△ T2)<0，△T2<0, f (△ T2)>0，T2SchoolThe air supply dew point temperature is set after the air supply part is corrected.
Wherein F (△ T1) and F (△ T2) can be respectively calculated by a controller through PID (proportion integration differentiation), the operation control quantity of PID comprises a proportional unit P, an integral unit I and a differential unit D, the collected data △ T1 or △ T2 is compared with a reference value in PID operation, and then the difference is used for calculating F (△ T1) or F (△ T2), wherein the proportional unit P, the integral unit I, the differential unit D and the reference value can be obtained by empirical parameters or debugging parameters.
In this embodiment, for example, when the constant temperature and humidity system is refrigerating and T1Is provided withAt 22 deg.C, if T1Measuring＝23℃，△T＝1>0, at this time f (△ T1)<0，T1School22 ℃ + f (△ T1), that is, when the room temperature is higher than the set value of 22 ℃, the fresh air conditioning unit can supply air at a value lower than 22 ℃ instead of 22 ℃Refrigeration and T1Is provided withAt 22 deg.C, if T1Measuring＝21℃，△T＝1<0, at this time f (△ T1)>0，T1School22 ℃ + f (△ T1), that is, when the room temperature is low and exceeds the set value of 22 ℃, the constant temperature and humidity system may supply air at a temperature value higher than 22 ℃ instead of 22 ℃.
According to the control method of the constant temperature and humidity system provided by the embodiment, the set air supply temperature and the set air supply dew point temperature are not fixed, the set value is corrected and automatically adjusted based on the difference value between the actual room temperature and the actual room dew point temperature, the closed-loop automatic control is adopted, the high-energy-consumption operation of the constant temperature and humidity system is avoided, and the overall operation cost is low.
In this embodiment, in addition to the above method, when the constant temperature and humidity system performs cooling, the set air supply temperature after the air supply unit is corrected is T1SchoolWhen the constant temperature and humidity system is heating, the set air temperature after the air blowing part is corrected is T1'School，T1’School＝T1SchoolFirst dead zone temperature, 0<The first dead zone temperature is less than or equal to 1 ℃; when the constant temperature and humidity system dehumidifies, the set air supply dew point temperature after the air supply part is corrected is T2SchoolWhen the constant temperature and humidity system is used for humidification, the set air dew point temperature after air supply part correction is T2'School，T2’School＝T2School-second dead zone temperature, 0<The second dead zone temperature ≦ 1 ℃. The first dead zone temperature and the second dead zone temperature refer to temperature areas which cannot be accurately controlled by the constant temperature and humidity system, and specific values of the first dead zone temperature and the second dead zone temperature can be selected according to the control accuracy of the constant temperature and humidity system.
In this embodiment, on the basis of the above method, the constant temperature and humidity system includes a cooling unit, and when the constant temperature and humidity system is used for cooling and dehumidifying, the constant temperature and humidity system cools and dehumidifies through the cooling unit;
the cooling unit comprises a first heat exchange tube and a first control valve arranged on the first heat exchange tube when respectively according to T1SchoolAnd T2SchoolWhen the first control valve has different opening degree variation values, the controller controls the valve at T1SchoolAnd T2SchoolThe first control valve opening degree is controlled by one with larger change valueThe opening degree of the first control valve is changed.
The embodiment also provides a constant temperature and humidity system for realizing the control method of the constant temperature and humidity system, which comprises a controller, and a temperature adjusting part, a humidity adjusting part, an air supply part, an indoor temperature sensor and an indoor dew point temperature sensor which are respectively connected with the controller; the air supply part is used for supplying the air processed by the temperature adjusting part and the humidity adjusting part into the constant temperature and humidity chamber, and the set air supply temperature of the air supply part is T1Is provided withThe set blow dew point temperature of the blowing part is T2Is provided withThe indoor temperature sensor and the indoor dew point temperature sensor are respectively used for measuring the actual room temperature T1 in the constant temperature and humidity roomMeasuringAnd actual indoor dew point temperature T2Measuring；
The controller is used for controlling the operation according to T1MeasuringAnd T1Is provided with△ T1 vs T1Is provided withCorrection and according to T2MeasuringAnd T2Is provided with△ T2 vs T2Is provided withPerforming a correction, wherein:
T1school＝T1Is provided with+ f (△ T1), wherein △ T1 ═ T1Measuring-T1Is provided with，△T1>0, f (△ T1)<0，△T1<0, f (△ T1)>0，T1SchoolFor the corrected set air supply temperature of the air supply part,
T2school＝T2Is provided with+ F (△ T2), wherein △ T2 ═ T2Measuring-T2Is provided with，△T2>0, F (△ T2)<0，△T2<0, F (△ T2)>0，T2SchoolThe air supply dew point temperature is set after the air supply part is corrected.
The constant temperature and humidity system that this embodiment provided, it sets for the air supply temperature and sets for air supply dew point temperature not fixed, but corrects, automatic adjustment this set point based on the difference of actual room temperature and actual indoor dew point temperature and this set point, adopts closed loop automatic control, avoids the operation of the high energy consumption of constant temperature and humidity system, and whole running cost is low.
In the present embodiment, on the basis of the above-described configuration, F (△ T1) and F (△ T2) are calculated by PID by the controller, respectively.
In the present embodiment, the above-described structureOn the basis, the humidity adjusting part comprises a cooling unit and a humidifier which are respectively connected with the controller; when the constant temperature and humidity system is used for dehumidification, the controller closes the humidifier and controls the cooling unit to work; when the constant temperature and humidity system is used for humidifying, the controller controls the cooling unit to be closed and controls the humidifier to work. When the constant temperature and humidity system is used for humidification, the controller controls the humidification to be T2'SchoolT2 'as the set blowing air dew point temperature after secondary correction of the blowing part'School＝T2School-second dead zone temperature, 0<The second dead zone temperature ≦ 1 ℃.
In this embodiment, on the basis of the above structure, the temperature adjustment portion includes a preheating unit and a reheating unit respectively connected with the controller, the preheating unit includes a second heat exchange tube, a preheating temperature sensor and a second control valve disposed on the second heat exchange tube, the preheating temperature sensor is used for measuring an actual preheating temperature T11 of the second heat exchange tubeMeasuring(ii) a The controller is used for controlling the actual preheating temperature T11 of the second heat exchange tubeMeasuringWhen the temperature is higher than the set preheating temperature of the heat exchange pipe, the opening degree of the second control valve is reduced, and the actual preheating temperature T11 is reachedMeasuringAnd when the temperature is lower than the set preheating temperature of the heat exchange tube, the opening degree of the second control valve is increased.
In this embodiment, on the basis of above-mentioned structure, constant temperature and humidity system still includes fresh air pipe and return air portion, and the air outlet of fresh air pipe and return air portion is equallyd divide and is communicate with the air intake of temperature regulation portion and the air intake of humidity control portion respectively. The fresh air duct is preferably, but not limited to, provided with a filtering structure.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (9)
1. A control method of a constant temperature and humidity system is characterized in that,
measuring constant temperature and humidityActual room temperature T1MeasuringAnd actual indoor dew point temperature T2Measuring；
According to the actual room temperature T1MeasuringThe set air supply temperature T1 of the air supply part of the constant temperature and humidity systemIs provided with△ T1 vs T1Is provided withAnd (3) correcting: t1School＝T1Is provided with+ f (△ T1), wherein △ T1 ═ T1Measuring-T1Is provided with，△T1>0, f (△ T1)<0，△T1<0, f (△ T1)>0，T1SchoolSetting the corrected air supply temperature for the air supply part;
when the constant temperature and humidity system is used for refrigerating, the set air supply temperature after the air supply part is corrected is T1School(ii) a When the constant temperature and humidity system heats, the set air supply temperature after the air supply part is corrected is T1'School，T1’School＝T1SchoolFirst dead zone temperature, 0<The first dead zone temperature is less than or equal to 1 ℃;
according to the actual indoor dew point temperature T2MeasuringThe set air supply dew point temperature T2 of the air supply part of the constant temperature and humidity systemIs provided with△ T2 vs T2Is provided withAnd (3) correcting: t2School＝T2Is provided with+ F (△ T2), wherein △ T2 ═ T2Measuring-T2Is provided with，△T2>0, F (△ T2)<0，△T2<0, F (△ T2)>0，T2SchoolSetting the air supply dew point temperature for the corrected air supply part;
when the constant temperature and humidity system dehumidifies, the set air supply dew point temperature after the air supply part is corrected is T2School(ii) a When the constant temperature and humidity system is used for humidification, the set air supply dew point temperature after the air supply part is corrected is T2'School，T2’School＝T2School-second dead zone temperature, 0<The second dead zone temperature ≦ 1 ℃.
2. The method for controlling a constant temperature and humidity system according to claim 1, wherein F (△ T1) and F (△ T2) are calculated by PID respectively by a controller.
3. The method for controlling the constant temperature and humidity system according to any one of claim 2, wherein the constant temperature and humidity system comprises a cooling unit, and when the constant temperature and humidity system is used for cooling and dehumidifying, the constant temperature and humidity system is cooled and dehumidified by the cooling unit;
the cooling unit comprises a first heat exchange pipe and a first control valve arranged on the first heat exchange pipe, and is respectively arranged according to the T1SchoolAnd said T2SchoolWhen the first control valve has different opening degree change values, the controller controls the first control valve to have the opening degree change value T1SchoolAnd said T2SchoolThe opening degree change of the first control valve is controlled by making the opening degree change value of the first control valve larger.
4. A constant temperature and humidity system is characterized by comprising a controller, and a temperature adjusting part, a humidity adjusting part, an air supply part, an indoor temperature sensor and an indoor dew point temperature sensor which are respectively connected with the controller;
the air supply part is used for supplying air processed by the temperature adjusting part and the humidity adjusting part into the constant temperature and humidity chamber, and the set air supply temperature of the air supply part is T1Is provided withThe set blow dew point temperature of the blow part is T2Is provided withThe indoor temperature sensor and the indoor dew point temperature sensor are respectively used for measuring the actual room temperature T1 in the constant temperature and humidity roomMeasuringAnd actual indoor dew point temperature T2Measuring；
The controller is used for controlling the power supply according to T1MeasuringAnd T1Is provided with△ T1 vs T1Is provided withCorrection and according to T2MeasuringAnd T2Is provided with△ T2 vs T2Is provided withPerforming a correction, wherein:
T1school＝T1Is provided with+ f (△ T1), wherein △ T1 ═ T1Measuring-T1Is provided with，△T1>0, f (△ T1)<0，△T1<0, f (△ T1)>0，T1SchoolThe corrected set air supply temperature of the air supply part is T1 when the constant temperature and humidity system is refrigeratingSchool(ii) a When the constant temperature and humidity system heats, the set air supply temperature after the air supply part is corrected is T1'School，T1’School＝T1SchoolFirst dead zone temperature, 0<The first dead zone temperature is less than or equal to 1 ℃;
T2school＝T2Is provided with+ F (△ T2), wherein △ T2 ═ T2Measuring-T2Is provided with，△T2>0, F (△ T2)<0，△T2<0, F (△ T2)>0，T2SchoolThe set air supply dew point temperature after the air supply part is corrected is T2 when the constant temperature and humidity system dehumidifiesSchool(ii) a When the constant temperature and humidity system is used for humidification, the set air supply dew point temperature after the air supply part is corrected is T2'School，T2’School＝T2School-second dead zone temperature, 0<The second dead zone temperature ≦ 1 ℃.
5. The system according to claim 4, wherein F (△ T1) and F (△ T2) are calculated by PID from the controller.
6. The system according to claim 4, wherein the humidity adjusting part comprises a cooling unit and a humidifier respectively connected to the controller; when the constant temperature and humidity system is used for dehumidification, the controller closes the humidifier and controls the cooling unit to work; when the constant temperature and humidity system is used for humidifying, the controller controls the cooling unit to be closed and controls the humidifier to work.
7. The constant temperature and humidity system according to any one of claim 6, wherein when the system is used for cooling and dehumidifying, the system is cooled and dehumidified by the cooling unit;
the cooling unit comprises a first heat exchange pipe and a first control valve arranged on the first heat exchange pipe, and is used according to the T1SchoolAnd said T2SchoolWhen the first control valve has different opening degree change values, the controller controls the first control valve to have the opening degree change value T1SchoolAnd said T2SchoolWherein the change of the opening degree of the first control valve is controlled by making the value of the change of the opening degree of the first control valve largerAnd (4) transforming.
8. The system according to any one of claims 4 to 6, further comprising a fresh air duct and an air return section, wherein the air outlets of the fresh air duct and the air return section are respectively communicated with the air inlet of the temperature adjusting section and the air inlet of the humidity adjusting section.
9. The system according to claim 8, wherein a filtering structure is arranged in the fresh air pipe.
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| CN107202386A (en) * | 2017-06-23 | 2017-09-26 | 华南理工大学 | Combined constant constant temperature and humidity controls wind cabinet and without dew point control method |
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| CN107702284A (en) | 2018-02-16 |
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Address after: Building No. 7, No. 289 Taji Road, Bacheng Town, Kunshan City, Suzhou City, Jiangsu Province, China Patentee after: Jinghe System Technology (Suzhou) Co.,Ltd. Address before: Room 3, 1288, Shipai Jinghan Road, Kunshan City, Suzhou City, Jiangsu Province Patentee before: KUNSHAN FLOWTECH ELECTRO-MECHANICAL ENGINEERING CO.,LTD. |