CN103759391A - Thermostatic and humidistat air conditioning system and control method for improving accuracies of indoor temperature and humidity - Google Patents
Thermostatic and humidistat air conditioning system and control method for improving accuracies of indoor temperature and humidity Download PDFInfo
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Abstract
The invention discloses a thermostatic and humidistat air conditioning system and a control method for improving accuracies of indoor temperature and humidity. The thermostatic and humidistat air conditioning system comprises a thermostatic and humidistat air conditioner, an air supply pipe, an air pipe heater, an air supply temperature sensor and a control system. The thermostatic and humidistat air conditioner is connected into a room via the air supply pipe, the air pipe heater is arranged in the air supply pipe, the air supply temperature sensor detects the temperature of air in the air supply pipe, and the thermostatic and humidistat air conditioner, the air pipe heater and the air supply temperature sensor are connected with the control system. On the basis that the conventional thermostatic and humidistat air conditioner controls the temperature and humidity of return air, a mean of controlling a difference value between the air supply temperature and a set temperature is added. The control method is simple and effective, high accuracies of the temperature and humidity of the thermostatic and humidistat air conditioner are realized, and cost for the whole system is reduced greatly.
Description
Technical field
The present invention relates to air conditioner controlling technology field, in particular the control method of a kind of constant temperature and humidity air-conditioning system and raising indoor temperature and humidity precision.
Background technology
Thermostatic and humidistatic air conditioning unit great majority are applied in the extra high occasion of temperature and humidity required precision: as places such as electronics industry, instrument and meter, precision optical machinery, bioengineering, food and drink, medical and health, the temperature and humidity precision in these places will directly affect quality, storage of product etc.
As everyone knows, between two parameters of temperature and relative humidity, originally just had certain contact, the rising of temperature can cause the decline of relative humidity, and vice versa.The control of constant-temperature constant-humidity air-conditioner mainly by freezing, heat, the air handling process such as humidification and dehumidifying forms, because control system will both be taken into account the control of temperature and take into account again the control of humidity.So several air handling processes carry out often in actual control procedure simultaneously: as heat humidification, refrigeration humidification, refrigerated dehumidification etc.So, how to solve the contradiction of handling well between air handling process and guarantee that again the precision of unit has become the problem of primary solution simultaneously.
If the temperature accuracy of common constant temperature and humidity unit can reach ± 0.8, if humidity precision can reach ± 5～7% be not easy, but often such precision cannot meet the environment instructions for use of some highly sophisticated devices at all.The appearance of digital scroll compressor and frequency-changing cyclone compressor and successful Application in recent years, solid-state relay or controllable silicon have been applied to the approaches and methods that improves thermostatic and humidistatic air conditioning unit temperature, humidity precision on electric heater regulates.But, digital scroll compressor and frequency-changing cyclone compressor are more much higher than the cost of common screw compressor, solid-state relay or silicon controlled cost are more much higher than the cost of A.C. contactor again, utilize these expensive equipment and suitable control method no doubt can improve the Temperature and Humidity Control precision of thermostatic and humidistatic air conditioning unit, but cost is too high, general user is difficult to accept.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
The object of the present invention is to provide the control method of a kind of constant temperature and humidity air-conditioning system and raising indoor temperature and humidity precision, be intended to solve existing thermostatic and humidistatic air conditioning unit and regulate the too high problem of equipment cost warm, humidity precision.
Technical scheme of the present invention is as follows: a kind of constant temperature and humidity air-conditioning system, wherein, comprise thermostatic and humidistatic air conditioning unit, air-supply airduct, airduct heater, wind pushing temperature sensor and control system, described thermostatic and humidistatic air conditioning unit is connected to indoor by air-supply airduct, airduct heater is arranged in air-supply airduct, wind pushing temperature sensor detects the temperature of wind in air-supply airduct, and described thermostatic and humidistatic air conditioning unit, airduct heater, wind pushing temperature sensor are all connected with control system.
Described constant temperature and humidity air-conditioning system, wherein, described constant temperature and humidity air-conditioning system also comprises return air temperature sensor and return air humidity sensor, return air temperature sensor detects the temperature of room air, return air humidity sensor detects the humidity of room air, and return air temperature sensor is all connected with control system with return air humidity sensor.
Described constant temperature and humidity air-conditioning system, wherein, is connected by solid-state relay between described airduct heater and control system, and control system control solid-state relay adopts pid algorithm step-less adjustment airduct heater.
Described constant temperature and humidity air-conditioning system, wherein, described thermostatic and humidistatic air conditioning unit is common thermostatic and humidistatic air conditioning unit, and described common thermostatic and humidistatic air conditioning unit is to adopt common screw compressor, electric heater to adopt the conventional meanses such as A.C. contactor to carry out the thermostatic and humidistatic air conditioning unit of grading control, humidification employing electrode humidifler.
Constant temperature and humidity air-conditioning system as described in above-mentioned any one improves a control method for indoor temperature and humidity precision, wherein, comprises following concrete steps:
Steps A 00: control system judges that constant temperature and humidity air-conditioning system is in refrigeration or the regulation process heating, if be in refrigeration regulation process, execution step B00; If be in, heat regulation process, execution step E00;
Step B00: control system judges whether the difference of the wind pushing temperature of design temperature and wind pushing temperature sensor feedback is greater than △ t, if be greater than △ t, execution step C00, if be less than or equal to △ t, execution step D00;
Step C00: control system control airduct heater starts to load, when the difference that receives the wind pushing temperature of design temperature and wind pushing temperature sensor feedback when control system is less than or equal to △ t, control system control constant temperature and humidity air-conditioning system does not change the current output of airduct heater;
Step D00: control system control constant temperature and humidity air-conditioning system does not change the current output of airduct heater;
Step e 00: control system judges whether the wind pushing temperature of wind pushing temperature sensor feedback and the difference of design temperature are less than △ t, if be less than △ t, execution step F00, if be more than or equal to △ t, execution step G00;
Step F 00: control system control airduct heater starts to load, when control system receive wind pushing temperature that wind pushing temperature sensor 400 feeds back and design temperature difference be more than or equal to △ t time, control system control constant temperature and humidity air-conditioning system does not change the current output of airduct heater;
Step G00: control system control constant temperature and humidity air-conditioning system does not change the current output of airduct heater.
Beneficial effect of the present invention: the present invention is by providing the control method of a kind of constant temperature and humidity air-conditioning system and raising indoor temperature and humidity precision, control method of the present invention is simply effective, realizing thermostatic and humidistatic air conditioning unit temperature, high-precision while of humidity, greatly reducing the cost of whole system.
Accompanying drawing explanation
Fig. 1 is the structural representation of constant temperature and humidity air-conditioning system in the present invention.
Fig. 2 is the flow chart of steps that in the present invention, constant temperature and humidity air-conditioning system improves the control method of indoor temperature and humidity precision.
The specific embodiment
For making object of the present invention, technical scheme and advantage clearer, clear and definite, referring to accompanying drawing, developing simultaneously, the present invention is described in more detail for embodiment.
As shown in Figure 1, be the structural representation of constant temperature and humidity air-conditioning system in the present invention.Described constant temperature and humidity air-conditioning system comprises thermostatic and humidistatic air conditioning unit 100, air-supply airduct 200, airduct heater 300, wind pushing temperature sensor 400, return air temperature sensor 500, return air humidity sensor 600 and control system 700, described thermostatic and humidistatic air conditioning unit 100 is connected to indoor by air-supply airduct 200, airduct heater 300 is arranged in air-supply airduct 200, wind pushing temperature sensor 400 is for detection of the temperature (being wind pushing temperature) of air-supply airduct 200 interior wind, return air temperature sensor 500 is for detection of the temperature (being return air temperature) of room air, return air humidity sensor 600 is for detection of the humidity (being return air humidity) of room air, described thermostatic and humidistatic air conditioning unit 100, airduct heater 300, wind pushing temperature sensor 400, return air temperature sensor 500 is all connected with control system 700 with return air humidity sensor 600.
Described airduct heater 300 is mainly used in guaranteeing that wind pushing temperature is relative constant with the absolute value of the difference of design temperature.Between described airduct heater 300 and control system 700, by solid-state relay, be connected, control system 700 is controlled solid-state relay and is adopted pid algorithm step-less adjustment airduct heater 300.
Described thermostatic and humidistatic air conditioning unit 100 is common thermostatic and humidistatic air conditioning unit, on the basis of a conventional constant temperature and humidity unit configuring, increase the airduct heater 300 of some, the solid-state relay of wind pushing temperature sensor 400 and adjusting airduct heater 300 use: pass through the output of pid algorithm step-less adjustment airduct heater 300 use solid-state relays on the basis of common thermostatic and humidistatic air conditioning unit control system, wind pushing temperature is controlled and is regulated by airduct heater 300, on the basis at common constant temperature and humidity machine return air temperature/humidity control method, the accurate control of increase to supply air temperature difference, thereby more effectively guarantee the temperature of return air, humidity precision.
Described common thermostatic and humidistatic air conditioning unit, adopts common screw compressor, electric heater to adopt the conventional meanses such as A.C. contactor to carry out the thermostatic and humidistatic air conditioning unit of grading control, humidification employing electrode humidifler.
Air-supply airduct heater add heat than air conditioner itself to add heat much smaller, so employing solid-state relay cost is lower; Measuring instrument only increases wind pushing temperature sensor 400, and temperature sensor humidity ratio sensor is wanted considerably cheaper; On air treatment system, only increased airduct heater 300, and airduct heater 300 be arranged in engineering also relatively simply, cost is also relatively low.The setting of these control and regulation equipment, has reduced the cost of this constant temperature and humidity air-conditioning system widely, simple to operate, has also realized existing thermostatic and humidistatic air conditioning unit temperature, the high-precision effect of humidity simultaneously.
As shown in Figure 2, be the flow chart of steps of the control method of constant temperature and humidity air-conditioning system in the present invention.A control method for constant temperature and humidity air-conditioning system as described above and raising indoor temperature and humidity precision, comprises following concrete steps:
Steps A 00: control system 700 judges that constant temperature and humidity air-conditioning system is in refrigeration or the regulation process heating, if be in refrigeration regulation process, execution step B00; If be in, heat regulation process, execution step E00;
Step B00: control system 700 judges whether the difference of the wind pushing temperature that design temperature and wind pushing temperature sensor 400 feed back is greater than the constant that the value of △ t(△ t is positive number, can establish), if be greater than △ t, execution step C00, if be less than or equal to △ t, execution step D00;
Step C00: control system 700 is controlled airduct heater 300 and started to load, when the difference that receives the wind pushing temperature that design temperature and wind pushing temperature sensor 400 feed back when control system 700 is less than or equal to △ t, control system 700 is controlled constant temperature and humidity air-conditioning system and is not changed the current output of airduct heater 300;
Step D00: control system 700 is controlled constant temperature and humidity air-conditioning system and do not changed the current output of airduct heater 300;
Step e 00: control system 700 judges whether wind pushing temperature that wind pushing temperature sensor 400 feeds back and the difference of design temperature are less than △ t, if be less than △ t, execution step F00, if be more than or equal to △ t, execution step G00;
Step F 00: control system 700 is controlled airduct heater 300 and started to load, when control system 700 receive wind pushing temperature that wind pushing temperature sensor 400 feeds back and design temperature difference be more than or equal to △ t time, control system 700 is controlled constant temperature and humidity air-conditioning system and is not changed the current output of airduct heater 300;
Step G00: control system 700 is controlled constant temperature and humidity air-conditioning system and do not changed the current output of airduct heater 300.
When constant temperature and humidity air-conditioning system heats, consider that air is by the factors such as airduct 200 dispels the heat of blowing, need to guarantee that wind pushing temperature is than the high △ t ℃ of design temperature, when constant temperature and humidity air-conditioning system freezes, consider that air is by the factors such as airduct 200 absorbs heat of blowing, need to guarantee that design temperature is than the high △ t ℃ of wind pushing temperature, as long as guaranteed that △ t's is constant, temperature in controlled room is just relatively constant, because of the relation of temperature and humidity, make indirectly to have guaranteed the precision of humidity when having guaranteed temperature accuracy.Controlling arranging of parameter, the pid parameter of airduct heater 300, the absolute value △ t of the difference of wind pushing temperature and design temperature is opening parameter, can adjust according to the actual conditions of concrete engineering (being mainly that the radiating and humidifying equipment of considering each concrete engineering exists larger difference) scene.
According to the control method of above-mentioned constant temperature and humidity air-conditioning system and raising indoor temperature and humidity precision thereof, now provide following specific embodiment to be illustrated:
The parameter of thermostatic and humidistatic air conditioning unit 100 is: air quantity is: 6000m3/h, refrigerating capacity: 25kW, humidification amount 8kg/h; Constant temperature and humidity air-conditioning system adds heat: 18kW; Air-supply airduct 200 adds heat: 9kW.
Set △ t=3 ℃, design temperature=25 ℃, set humidity=60%Rh; Through monitoring and data statistics for a long time, draw following result:
When constant temperature and humidity air-conditioning system is when freezing regulation process, mean value=22.1 ℃ of wind pushing temperature, real time temperature error is within 0.2 ℃; Mean value=25.2 ℃ of return air temperature, real time temperature error is within 0.2 ℃; Return air humidity mean value=62.5%, humidity error is within 3% in real time;
When constant temperature and humidity air-conditioning system is when heating regulation process, mean value=27.9 ℃ of wind pushing temperature, real time temperature error is within 0.2 ℃; Mean value=24.9 ℃ of return air temperature, real time temperature error is within 0.15 ℃; Return air humidity mean value=62.2%, humidity error is within 2.5% in real time;
From above-mentioned experimental data, utilize this constant temperature and humidity air-conditioning system to regulate and control indoor humiture, its regulating effect has high accuracy, meet and use needs, and the regulation and control of this constant temperature and humidity air-conditioning system is effectively simple, greatly reduces the cost of whole system.
Should be understood that, application of the present invention is not limited to above-mentioned giving an example, and for those of ordinary skills, can be improved according to the above description or convert, and all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (5)
1. a constant temperature and humidity air-conditioning system, it is characterized in that, comprise thermostatic and humidistatic air conditioning unit, air-supply airduct, airduct heater, wind pushing temperature sensor and control system, described thermostatic and humidistatic air conditioning unit is connected to indoor by air-supply airduct, airduct heater is arranged in air-supply airduct, wind pushing temperature sensor detects the temperature of wind in air-supply airduct, and described thermostatic and humidistatic air conditioning unit, airduct heater, wind pushing temperature sensor are all connected with control system.
2. constant temperature and humidity air-conditioning system according to claim 1, it is characterized in that, described constant temperature and humidity air-conditioning system also comprises return air temperature sensor and return air humidity sensor, return air temperature sensor detects the temperature of room air, return air humidity sensor detects the humidity of room air, and return air temperature sensor is all connected with control system with return air humidity sensor.
3. constant temperature and humidity air-conditioning system according to claim 2, is characterized in that, between described airduct heater and control system, by solid-state relay, is connected, and control system control solid-state relay adopts pid algorithm step-less adjustment airduct heater.
4. constant temperature and humidity air-conditioning system according to claim 3, it is characterized in that, described thermostatic and humidistatic air conditioning unit is common thermostatic and humidistatic air conditioning unit, and described common thermostatic and humidistatic air conditioning unit is to adopt common screw compressor, electric heater to adopt the conventional meanses such as A.C. contactor to carry out the thermostatic and humidistatic air conditioning unit of grading control, humidification employing electrode humidifler.
5. the constant temperature and humidity air-conditioning system as described in claim 1-4 any one improves a control method for indoor temperature and humidity precision, it is characterized in that, comprises following concrete steps:
Steps A 00: control system judges that constant temperature and humidity air-conditioning system is in refrigeration or the regulation process heating, if be in refrigeration regulation process, execution step B00; If be in, heat regulation process, execution step E00;
Step B00: control system judges whether the difference of the wind pushing temperature of design temperature and wind pushing temperature sensor feedback is greater than △ t, if be greater than △ t, execution step C00, if be less than or equal to △ t, execution step D00;
Step C00: control system control airduct heater starts to load, when the difference that receives the wind pushing temperature of design temperature and wind pushing temperature sensor feedback when control system is less than or equal to △ t, control system control constant temperature and humidity air-conditioning system does not change the current output of airduct heater;
Step D00: control system control constant temperature and humidity air-conditioning system does not change the current output of airduct heater;
Step e 00: control system judges whether the wind pushing temperature of wind pushing temperature sensor feedback and the difference of design temperature are less than △ t, if be less than △ t, execution step F00, if be more than or equal to △ t, execution step G00;
Step F 00: control system control airduct heater starts to load, when control system receive wind pushing temperature that wind pushing temperature sensor 400 feeds back and design temperature difference be more than or equal to △ t time, control system control constant temperature and humidity air-conditioning system does not change the current output of airduct heater;
Step G00: control system control constant temperature and humidity air-conditioning system does not change the current output of airduct heater.
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| CN106839252A (en) * | 2015-12-04 | 2017-06-13 | 艾默生网络能源有限公司 | A kind of dehumidification control method, device, system and air-conditioning |
| CN108826586A (en) * | 2018-06-07 | 2018-11-16 | 广东建设职业技术学院 | A kind of control system and control method of steam heating dry saturated steam humidification constant temperature and humidity central air-conditioning |
| CN111076316A (en) * | 2019-12-09 | 2020-04-28 | 广东申菱环境系统股份有限公司 | Humidity control method |
| CN112361525A (en) * | 2020-11-02 | 2021-02-12 | 海信（山东）空调有限公司 | Air conditioner dehumidification method and air conditioner |
| CN115218466A (en) * | 2022-08-12 | 2022-10-21 | 南京天加环境科技有限公司 | Full fresh air constant temperature and humidity system and refrigerating method and heating method thereof |
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