CN103759391B - A kind of constant temperature and humidity air-conditioning system and the control method of raising indoor temperature and humidity precision - Google Patents
A kind of constant temperature and humidity air-conditioning system and the control method of raising indoor temperature and humidity precision Download PDFInfo
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Abstract
The invention discloses a kind of constant temperature and humidity air-conditioning system and improve the control method of indoor temperature and humidity precision, this system includes 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, the temperature of wind pushing temperature sensor detection air-supply airduct endogenous wind, described thermostatic and humidistatic air conditioning unit, airduct heater, wind pushing temperature sensor are all connected with control system.This method is on the basis of conventional thermostatic constant wetting air conditioner controls return air humiture, adds the control device of wind pushing temperature and design temperature difference.The control method of the present invention is simply effective, realize thermostatic and humidistatic air conditioning unit epidemic disaster high-precision while, greatly reduce the cost of whole system.
Description
Technical field
The present invention relates to air conditioner controlling technology field, a kind of constant temperature and humidity air-conditioning system and the control method of raising indoor temperature and humidity precision.
Background technology
Thermostatic and humidistatic air conditioning unit great majority are applied in occasion extra high to temperature and humidity required precision: such as places such as electronics industry, instrument and meter, precision optical machinery, biological engineering, food and drink, medical and health, the temperature and humidity precision in these places will directly affect the quality of product, storage etc..
It is known that natively there is certain contact between temperature and two parameters of relative humidity, the rising of temperature can cause the decline of relative humidity, and vice versa.The control of constant-temperature constant-humidity air-conditioner is mainly by freezing, heat, humidify and the air handling process such as dehumidifying forming, because control system both to be taken into account the control of temperature and take into account the control of humidity again.So, during actual control, several air handling processes are carried out simultaneously often: as heated humidification, refrigeration humidification, refrigerated dehumidification etc..So, the contradiction how solving to handle well between air handling process ensures again the problem that the precision of unit has become 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 the environment that the most such precision cannot meet some highly sophisticated devices at all uses requirement.Digital scroll compressor and the appearance of frequency-changing cyclone compressor and successful Application, solid-state relay or controllable silicon being applied on electric heater regulates improve the approaches and methods of thermostatic and humidistatic air conditioning unit epidemic disaster precision in recent years.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 the equipment of these high costs and suitable control method no doubt can improve the Temperature and Humidity Control precision of thermostatic and humidistatic air conditioning unit, but cost is the highest, general user is difficult to accept.
Therefore, prior art has yet to be improved and developed.
Summary of the invention
It is an object of the invention to provide a kind of constant temperature and humidity air-conditioning system and improve the control method of indoor temperature and humidity precision, it is intended to solving the problem that the equipment cost of existing thermostatic and humidistatic air conditioning unit regulation epidemic disaster precision is the highest.
Technical scheme is as follows: a kind of constant temperature and humidity air-conditioning system, wherein, including 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, the temperature of wind pushing temperature sensor detection air-supply airduct endogenous wind, 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 includes return air temperature sensor and return air humidity sensor, the temperature of return air temperature sensor detection room air, the humidity of return air humidity sensor detection room air, return air temperature sensor and return air humidity sensor are all connected with control system.
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 controls solid-state relay and uses 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 use common screw compressor, electric heater to use the conventional meanses such as A.C. contactor to carry out grading control, the thermostatic and humidistatic air conditioning unit of humidification employing electrode humidifler.
A kind of constant temperature and humidity air-conditioning system as described in above-mentioned any one improves the control method of indoor temperature and humidity precision, wherein, including step in detail below:
Step A00: control system judges that constant temperature and humidity air-conditioning system is at the regulation process freezing or heating, if being in refrigeration regulation process, performs step B00；Heating regulation process if being in, performing step E00;
Step B00: control system judges that the design temperature difference with the wind pushing temperature of wind pushing temperature sensor feedback, whether more than △ t, if more than △ t, performs step C00, if less than or equal to △ t, performs step D00；
Step C00: control system controls airduct heater and starts to load, when control system receives the design temperature difference with the wind pushing temperature of wind pushing temperature sensor feedback less than or equal to △ t, control system controls constant temperature and humidity air-conditioning system and does not change the output that airduct heater is current；
Step D00: control system controls constant temperature and humidity air-conditioning system and do not changes the output that airduct heater is current；
Step E00: control system judges that wind pushing temperature that wind pushing temperature sensor the feeds back difference with design temperature, whether less than △ t, if less than △ t, performs step F00, if more than or equal to △ t, performs step G00；
Step F00: control system controls airduct heater and starts to load, when control system receive the difference of wind pushing temperature and the design temperature of wind pushing temperature sensor 400 feedback more than or equal to △ t time, control system controls constant temperature and humidity air-conditioning system and does not change the output that airduct heater is current；
Step G00: control system controls constant temperature and humidity air-conditioning system and do not changes the output that airduct heater is current.
Beneficial effects of the present invention: the present invention is by providing a kind of constant temperature and humidity air-conditioning system and improving the control method of indoor temperature and humidity precision, the control method of the present invention is the most effective, realize thermostatic and humidistatic air conditioning unit epidemic disaster high-precision while, greatly reduce 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 of the control method that constant temperature and humidity air-conditioning system improves indoor temperature and humidity precision in the present invention.
Detailed description of the invention
For making the purpose of the present invention, technical scheme and advantage clearer, clear and definite, the present invention is described in more detail for the embodiment that develops simultaneously referring to the drawings.
As it is shown in figure 1, be the structural representation of constant temperature and humidity air-conditioning system in the present invention.nullDescribed constant temperature and humidity air-conditioning system includes 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 detecting the temperature (i.e. wind pushing temperature) of air-supply airduct 200 endogenous wind，Return air temperature sensor 500 is for detecting the temperature (i.e. return air temperature) of room air，Return air humidity sensor 600 is for detecting the humidity (i.e. 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 and return air humidity sensor 600 are all connected with control system 700.
Described airduct heater 300 is used primarily to ensure the absolute value relative constancy of wind pushing temperature and the difference of design temperature.Described airduct heater 300 is connected by solid-state relay between control system 700, and control system 700 controls solid-state relay and uses pid algorithm step-less adjustment airduct heater 300.
Described thermostatic and humidistatic air conditioning unit 100 is common thermostatic and humidistatic air conditioning unit, a number of airduct heater 300 is increased on the basis of the constant temperature and humidity unit of a conventional configuration, wind pushing temperature sensor 400 and the solid-state relay of regulation airduct heater 300: by the output of solid-state relay of pid algorithm step-less adjustment airduct heater 300 on the basis of common thermostatic and humidistatic air conditioning unit control system, wind pushing temperature is controlled by airduct heater 300 and regulates, by on the basis of common constant temperature and humidity machine return air temperature/humidity control method, increase the accurate control to supply air temperature difference, thus more effectively ensure the temperature of return air, humidity precision.
Described common thermostatic and humidistatic air conditioning unit, i.e. uses common screw compressor, electric heater to use the conventional meanses such as A.C. contactor to carry out grading control, the thermostatic and humidistatic air conditioning unit of humidification employing electrode humidifler.
Add heat than air conditioner itself much smaller for the heat that adds of air-supply airduct heater, so employing solid-state relay cost is relatively low；Measuring instruments only increases wind pushing temperature sensor 400, and considerably cheaper wanted by temperature sensor humidity ratio sensor；Air treatment system then merely add airduct heater 300, and airduct heater 300 be arranged in engineering the most relatively easy, cost is also relatively low.The setting of these control and regulation equipment, greatly reduces the cost of this constant temperature and humidity air-conditioning system, simple to operate, also achieves the existing high-precision effect of thermostatic and humidistatic air conditioning unit epidemic disaster simultaneously.
As in figure 2 it is shown, be the flow chart of steps of the control method of constant temperature and humidity air-conditioning system in the present invention.A kind of constant temperature and humidity air-conditioning system as described above and the control method of raising indoor temperature and humidity precision, including step in detail below:
Step A00: control system 700 judges that constant temperature and humidity air-conditioning system is at the regulation process freezing or heating, if being in refrigeration regulation process, performs step B00；Heating regulation process if being in, performing step E00;
Step B00: control system 700 judges whether the difference of the wind pushing temperature of design temperature and wind pushing temperature sensor 400 feedback is more than the constant that value is positive number of △ t(△ t, can set), if more than △ t, performing step C00, if being less than or equal to △ t, performing step D00；
Step C00: control system 700 controls airduct heater 300 and starts to load, when control system 700 receives the design temperature difference with the wind pushing temperature of wind pushing temperature sensor 400 feedback less than or equal to △ t, control system 700 controls constant temperature and humidity air-conditioning system and does not change the output that airduct heater 300 is current；
Step D00: control system 700 controls constant temperature and humidity air-conditioning system and do not changes the output that airduct heater 300 is current；
Step E00: control system 700 judges that wind pushing temperature that wind pushing temperature sensor 400 the feeds back difference with design temperature, whether less than △ t, if less than △ t, performs step F00, if more than or equal to △ t, performs step G00；
Step F00: control system 700 controls airduct heater 300 and starts to load, when control system 700 receive the difference of wind pushing temperature and the design temperature of wind pushing temperature sensor 400 feedback more than or equal to △ t time, control system 700 controls constant temperature and humidity air-conditioning system and does not change the output that airduct heater 300 is current；
Step G00: control system 700 controls constant temperature and humidity air-conditioning system and do not changes the output that airduct heater 300 is current.
When constant temperature and humidity air-conditioning system heats, in view of air by factors such as air-supply airduct 200 heat radiations, it is necessary to ensure that wind pushing temperature △ higher than design temperature t DEG C, when constant temperature and humidity air-conditioning system freezes, in view of air by factors such as air-supply airduct 200 heat absorptions, it is necessary to ensure that design temperature △ higher than wind pushing temperature t DEG C, as long as ensure that △ t's is constant, temperature in controlled room is with regard to relative constancy, relation because of temperature and humidity so that indirectly ensure that the precision of humidity while ensure that temperature accuracy.Controlling arranging of parameter, the pid parameter of airduct heater 300, wind pushing temperature is opening parameter with the absolute value △ t of the difference of design temperature, can adjust according to practical situation (the mainly radiating and humidifying equipment in view of each concrete engineering the exists bigger difference) scene of concrete engineering.
According to above-mentioned constant temperature and humidity air-conditioning system and the control method of raising indoor temperature and humidity precision thereof, specific examples below is now provided to be illustrated:
The parameter of thermostatic and humidistatic air conditioning unit 100 is: air quantity is: 6000m3/h, and refrigerating capacity: 25kW adds moisture 8kg/h；Constant temperature and humidity air-conditioning system adds heat: 18kW；Air-supply airduct 200 adds heat: 9kW.
Set △ t=3 DEG C, design temperature=25 DEG C, set humidity=60%Rh；Through for a long time monitoring and data statistics, draw following result:
When constant temperature and humidity air-conditioning system is in refrigeration regulation process, meansigma methods=22.1 DEG C of wind pushing temperature, real time temperature error is within 0.2 DEG C；Meansigma methods=25.2 DEG C of return air temperature, real time temperature error is within 0.2 DEG C；Return air humidity meansigma methods=62.5%, real-time humidity error is within 3%；
When constant temperature and humidity air-conditioning system is in and heats regulation process, meansigma methods=27.9 DEG C of wind pushing temperature, real time temperature error is within 0.2 DEG C；Meansigma methods=24.9 DEG C of return air temperature, real time temperature error is within 0.15 DEG C；Return air humidity meansigma methods=62.2%, real-time humidity error is within 2.5%；
From above-mentioned experimental data, utilizing this constant temperature and humidity air-conditioning system to regulate and control indoor humiture, its regulating effect has high accuracy, meets and uses needs, and the regulation and control of this constant temperature and humidity air-conditioning system are simple effectively, greatly reduce the cost of whole system.
It should be appreciated that the application of the present invention is not limited to above-mentioned citing, for those of ordinary skills, can be improved according to the above description or convert, all these modifications and variations all should belong to the protection domain of claims of the present invention.
Claims (2)
1. a constant temperature and humidity air-conditioning system, it is characterized in that, including 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, the temperature of wind pushing temperature sensor detection air-supply airduct endogenous wind, 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 also includes return air temperature sensor and return air humidity sensor, the temperature of return air temperature sensor detection room air, the humidity of return air humidity sensor detection room air, return air temperature sensor and return air humidity sensor are all connected with control system；
Being connected by solid-state relay between described airduct heater and control system, control system controls solid-state relay and uses pid algorithm step-less adjustment airduct heater；
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 use common screw compressor, electric heater to use A.C. contactor to carry out grading control, the thermostatic and humidistatic air conditioning unit of humidification employing electrode humidifler；By on the basis of common constant temperature and humidity machine return air temperature/humidity control method, increase the accurate control to supply air temperature difference, thus more effectively ensure the epidemic disaster precision of return air.
2. a constant temperature and humidity air-conditioning system as claimed in claim 1 improves the control method of indoor temperature and humidity precision, it is characterised in that include step in detail below:
Step A00: control system judges that constant temperature and humidity air-conditioning system is at the regulation process freezing or heating, if being in refrigeration regulation process, performs step B00；Heating regulation process if being in, performing step E00;
Step B00: control system judges that the design temperature difference with the wind pushing temperature of wind pushing temperature sensor feedback, whether more than △ t, if more than △ t, performs step C00, if less than or equal to △ t, performs step D00；
Step C00: control system controls airduct heater and starts to load, when control system receives the design temperature difference with the wind pushing temperature of wind pushing temperature sensor feedback less than or equal to △ t, control system controls constant temperature and humidity air-conditioning system and does not change the output that airduct heater is current；
Step D00: control system controls constant temperature and humidity air-conditioning system and do not changes the output that airduct heater is current；
Step E00: control system judges that wind pushing temperature that wind pushing temperature sensor the feeds back difference with design temperature, whether less than △ t, if less than △ t, performs step F00, if more than or equal to △ t, performs step G00；
Step F00: control system controls airduct heater and starts to load, when control system receive the difference of wind pushing temperature and the design temperature of wind pushing temperature sensor 400 feedback more than or equal to △ t time, control system controls constant temperature and humidity air-conditioning system and does not change the output that airduct heater is current；
Step G00: control system controls constant temperature and humidity air-conditioning system and do not changes the output that airduct heater is current.
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| CN106839252B (en) * | 2015-12-04 | 2019-06-04 | 维谛技术有限公司 | A kind of dehumidification control method, device, system and air-conditioning |
| CN108826586B (en) * | 2018-06-07 | 2020-07-14 | 广东建设职业技术学院 | Control system and control method for steam heating dry steam humidifying constant-temperature constant-humidity central air conditioner |
| 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 |
| CN112361525B (en) * | 2020-11-02 | 2022-03-22 | 海信（山东）空调有限公司 | Air conditioner dehumidification method and air conditioner |
| CN115218466B (en) * | 2022-08-12 | 2024-04-26 | 南京天加环境科技有限公司 | Fresh air constant temperature and humidity system and refrigerating method and heating method thereof |
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