CN104950957B - Display and control method for reconversion of relative humidity - Google Patents
Display and control method for reconversion of relative humidity Download PDFInfo
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- CN104950957B CN104950957B CN201410123784.7A CN201410123784A CN104950957B CN 104950957 B CN104950957 B CN 104950957B CN 201410123784 A CN201410123784 A CN 201410123784A CN 104950957 B CN104950957 B CN 104950957B
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Abstract
The invention discloses a display and control method for the reconversion of relative humidity, and solves a problem that humidity cannot be displayed accurately when temperature rises in a vicious circle and measured temperature is greater than preset temperature because environmental experiment equipment employs a relative humidity control method and a water vapor partial pressure method. The method comprises the following steps: calculating a water vapor partial pressure value; calculating a reconverted relative humidity value according to a set temperature value and the water vapor partial pressure value; judging a measured temperature value and a set temperature value; enabling a display to display the reconverted relative humidity value when the measured temperature value is not less than the set temperature value; enabling the display to display the measured relative humidity value when the measured temperature value is less than the set temperature value; and finally carrying out the PID calculation of the output quantity of a humidifier.
Description
Technical field
The present invention relates to be used for the Temperature and Humidity Control of environmental test equipment and the method for display, and more particularly relate to one
Plant the control and display methods converted again for the relative humidity of environmental test equipment.
Background technology
Environmental test equipment is used as in the testing equipment of specific temperature, humidity environment, by temperature and humidity
Control, the epidemic disaster condition of experimental enviroment is maintained in regulation deviation range.To reach this technical purpose, existing temperature
The hardware configuration that the environmental test equipment of humid control is used includes：The test flume being made of thermal insulation board, test flume is connected to sky
Adjusting room, air conditioning chamber includes being used to the refrigerator lowered the temperature and dehumidify, pressure fan, heater, humidifier, Temperature Humidity Sensor and warm and humid
The parts such as degree controller.
The principle of the environmental test equipment of said structure is that the humiture that sensor is measured is input to Temperature and Humidity Control
Device, by the calculating inside controller, controls the output of the switch or regulation refrigerator, heater and humidifier of refrigerator
Amount, to reach the humiture of setting.
If such as 30 DEG C/50%RH of setting humiture, set temperature value (temperature SV values) is 35 DEG C, sets relative humidity
Value (humidity SV values) 50%RH.There are measured value that the Temperature Humidity Sensor in test flume measures (temperature PV values and wet in addition
Degree PV values).The comparing of this setting value (SV values) and measured value (PV values), is calculated by PID control, draws heater and humidification
The size of the output quantity of device and the refrigerating capacity of refrigerator.
The environmental test equipment of prior art typically uses relative humidity control mode, including is sensed using wet and dry bulb temperature
Two kinds of metering systems of device or dry-bulb temperature sensor and humidity direct capacitance sensor.
As shown in figure 1, using wet and dry bulb temperature sensor, with dry-bulb temperature sensor measured value (PvT) and wet bulb
Measured temperature (PvT ') calculates rh value in groove (PvH), is compared to relative humidity measured value (SvH)
Control PID calculates heating amount and humidification amount.
As shown in Fig. 2 if being measured using direct capacitance relative humidity sensor, measurement value sensor is rh value
(PvH) Control PID calculating heating amount and humidification amount, are being compared to RH set point (SvH).
Above two method advantage is succinct convenient, but relative humidity is the relative value for being subject to temperature height influence.Than
The control cabinet of 30 DEG C/50%RH of humiture is such as set, groove internal heater lifting temperature, relative humidity can decline.Same absolute
In the state of amount of moisture, 30 DEG C rise to if 31 DEG C, and original 50% relative humidity may be reduced to 47.5%.Such
Under state, controller can be produced to judge that humidity declines → increased the heat of the output → humidifier of humidifier and causes in groove temperature again
Temperature declines → again increases the vicious circle of humidifier output again in degree rising → groove.
In order to solve the phenomenon of above-mentioned humiture vicious circle, Japan Patent logs in number 2928151《Steam partial pressure
Control》The method controlled using steam partial pressure.As shown in figure 3, being characterized in：Setting value and measured value are changed with internal calculation
Into setting steam partial pressure value (SvPh) and measure steam partial pressure value (PvPh), both are input into PID and are compared to control to add
The output of wet device.Because steam partial pressure value is the absolute value that is not influenceed by temperature, so using above-mentioned control method temperature
It is the vapor powder compacting that can also reach setting that degree rises, and will not increase the output of humidifier, is prevented from humidifier lasting defeated
Go out the vicious circle of heating.Current each environmental test equipment producer uses this control method as the major design of product
Thinking.
Steam partial pressure control can solve the problems, such as that temperature rises always, but exist when temperature rises and show that humidity is inclined
Low problem.When being controlled than 30 DEG C/50%RH of example described above, due to various, if temperature rises to 31
DEG C, humidity display remains as 47.5%RH, and like this display humidity does not reach setting humidity value always, and user cannot judge
Whether humidity reaches setting value.
The content of the invention
The invention aims to solve the lasting heating that environmental test equipment is produced using relative humidity control mode
Vicious circle problem and using steam partial pressure control mode produce display humidity do not reach always setting humidity value problem,
Display and control method that a kind of relative humidity is converted again are provided.
To achieve the above object, technical scheme is as follows：
Display and control method that a kind of relative humidity is converted again, are applied to environmental test equipment, and the environmental test sets
The standby PIDPID including test flume, heater, humidifier, temperature/humidity sensor, display, control heater and humidifier, should
Method default settings temperature value first and setting rh value, it is further comprising the steps of：
Calculate steam partial pressure value；
Calculate and convert rh value again according to set temperature value and steam partial pressure value；
Judge temperature of the measurement value and set temperature value, when temperature of the measurement value, >=set temperature value, display shows and become again
Rh value is changed, when temperature of the measurement value ＜ set temperature values, display display determines rh value；
PID calculates humidifier output quantity.
Further, methods described also includes：
Design temperature deviation；
Judge whether temperature of the measurement value is more than set temperature value ± temperature deviation value；
Such as judge to set up, display shows and converts rh value again；
Such as judge invalid, display display determines rh value.
Further, methods described also includes：
Display shows temperature of the measurement value；
Set temperature value and temperature of the measurement value input PID are calculated；
PID adjusts heater outputs according to result of calculation.
Further, PID calculates humidifier output quantity and is counted compared with steam partial pressure value by setting steam partial pressure value
Calculate.
Further, the setting steam partial pressure value is calculated by set temperature value compared with setting humidity value.
Further, PID calculating humidifier output quantity compares meter by setting rh value with rh value is converted again
Calculate.
Further, the temperature of the measurement value is measured by dry-bulb temperature sensor, determines rh value by direct capacitance phase
To humidity sensor measurement.
Further, the measure rh value is calculated by temperature of the measurement value and measure wet-bulb temperature value, described
Temperature of the measurement value and measure wet-bulb temperature value are measured by dry/wet bulb temperature sensor.
Display and control method that a kind of relative humidity provided using the present invention is converted again, commutation is become by calculating again
To humidity value, and setting rh value and will again convert rh value and be compared, calculate humidification amount, and by measure
Comparison between temperature value and set temperature value, judges that display converts rh value or rh value again, solves use
The vicious circle problem of the lasting heating that relative humidity control mode is produced and working as using the generation of steam partial pressure control mode
Design temperature shows that humidity does not reach setting humidity value problem always when being more than temperature of the measurement.
Brief description of the drawings
Fig. 1 is schematic flow sheet of the prior art using the relative moisture control method of dry and wet ball sensor；
Fig. 2 is schematic flow sheet of the prior art using the relative moisture control method of direct capacitance relative humidity sensor；
Fig. 3 is schematic flow sheet of the prior art using steam partial pressure control method；
Fig. 4 is the hardware system structure figure of environment testing equipment of the present invention；
Fig. 5 is the schematic flow sheet for converting humidity display and control method again of one embodiment of the invention；
Fig. 6 is the schematic flow sheet for converting humidity display and control method again of another embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
As shown in figures 4-6, Fig. 4 is the hardware system structure figure of environment testing equipment of the invention；Fig. 5 is the present invention one
The schematic flow sheet for converting humidity display and control method again of individual embodiment；Fig. 6 is converted again for one embodiment of the invention
The schematic flow sheet of humidity display and control method.
A kind of environment testing equipment, including：Test flume 110, temperature sensor 142, humidity sensor 145, air conditioner
120th, electrical equipment meter dress part 140, refrigerating circuit 130 and power supply 146, the air conditioner 120 by pressure fan 121, heater 122,
Evaporator 123 and humidifier 144 are constituted.Temperature sensor 142 and the connecting circuit meter of humidity sensor 145 dress part 140, measurement
Temperature and humidity, obtains temperature of the measurement value (PvT) and determines rh value (PvH).The electrical equipment meter dress part includes
PID141 and display, heater 122 and humidifier 144 are connected by solid-state relay 143 with power supply, PID141 connection solid-states
Relay sends the switching signal of power supply.The evaporator 123 is connected with refrigerating circuit 130.
The sensor of environment testing equipment can be dry/wet bulb sensor or direct capacitance relative humidity sensor, in work
When sensor measure temperature of the measurement value (PvT) and measure rh value (PvH) be input to PID141, by PID141
The calculating in portion, controls the output of the switch or regulation evaporator 123, heater 122 and humidifier 144 of refrigerating circuit 130
Amount, to reach the humiture of setting.
Used as a preferred embodiment, Fig. 5 is that a kind of relative humidity of the present invention based on above-mentioned hardware device is converted again
Display and control method, including：
A. set temperature value (SvT) and setting rh value (SvH) are input into PID, and calculate setting vapor point
Pressure value (SvPh)；
B. the temperature and humidity in temperature sensor and humidity sensor measurement test flume, obtains temperature of the measurement value (PvT)
With measure rh value (PvH)；
C. display shows temperature of the measurement value (PvT)；
D. trough inner water partial vapour pressure value is calculated according to temperature of the measurement value (PvT) and measure rh value (PvH)
(PvPh)；
E. calculated according to set temperature value (SvT) and steam partial pressure value (PvPh) and convert again rh value and (become again
Change PvH)；
F. as temperature of the measurement value (PvT) >=set temperature value (SvT), display shows and convert again rh value (again
Conversion PvH), as temperature of the measurement value (PvT) ＜ set temperature value (SvT), display display determines rh value (PvH)；
G. set temperature value (SvT) and temperature of the measurement value (PvT) input PID are calculated, draws heater outputs
(MvD)；
H. setting setting steam partial pressure value (SvPh) and trough inner water partial vapour pressure value (PvPh) input PID are calculated, is obtained
Go out humidifier output quantity (MvW).
Used as another preferred embodiment, Fig. 6 is the display and controlling party that another relative humidity of the invention is converted again
Method, including following steps：
A. set temperature value (SvT) and setting rh value (SvH) are input into PID；
B. the temperature and humidity in temperature sensor and humidity sensor measurement test flume, obtains temperature of the measurement value (PvT)
With measure rh value (PvH)；
C. display shows temperature of the measurement value (PvT)；
D. trough inner water partial vapour pressure value is calculated according to temperature of the measurement value (PvT) and measure rh value (PvH)
(PvPh)；
E. calculated according to set temperature value (SvT) and steam partial pressure value (PvPh) and convert again rh value and (become again
Change PvH)；
F. as temperature of the measurement value (PvT) >=set temperature value (SvT), display shows and convert again rh value (again
Conversion PvH), as temperature of the measurement value (PvT) ＜ set temperature value (SvT), display display determines rh value (PvH)；
G. set temperature value (SvT) will be set and temperature of the measurement value (PvT) input PID will be calculated, PID will be adjusted according to result of calculation
Whole heater output valve (MvD)；
H. rh value (SvH) will be set and rh value (converting PvH again) input PID will be converted again and will be calculated, PID roots
Humidifier output quantity (MvW) is adjusted according to result of calculation.
Above two method, during temperature change, can produce the humidity value of actual measurement and the deviation of show value.
To solve this problem, step F also can transform to：
I design temperatures deviation (T ')；
Ii judges whether temperature of the measurement value (PvT) is more than 1 set temperature value (SvT) ± temperature deviation value (T ')；
Iii such as judges to set up, and display shows and convert again rh value (converting PvH again),
Iv such as judges invalid, and display display determines rh value (PvH).
Above two method, convert again rh value (converting PvH again), and will again convert relative humidity by calculating
Value (converting PvH again) input PID141 is compared, and humidification amount (MvW) is calculated, by temperature of the measurement value and set temperature value
Between comparison, judge that display converts rh value or rh value again, solve and produced using relative humidity control mode
The vicious circle problem of raw lasting heating and do not reach set always using the display humidity that steam partial pressure control mode is produced
Determine humidity value problem.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention
Within god and principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (4)
1. a kind of relative humidity is converted again display and control method, are applied to environmental test equipment, the environmental test equipment
PID including test flume, heater, humidifier, temperature/humidity sensor, display, control heater and humidifier, the method
First default settings temperature value and setting rh value, it is characterised in that it is further comprising the steps of：
Steam partial pressure value is calculated according to temperature of the measurement value and measure rh value；
Calculate and convert rh value again according to set temperature value and steam partial pressure value；
Judge temperature of the measurement value and set temperature value, when temperature of the measurement value >=set temperature value, display shows and becomes commutation again
To humidity value, when temperature of the measurement value ＜ set temperature values, display display determines rh value；
PID calculates humidifier output quantity.
2. a kind of relative humidity according to claim 1 is converted again display and control method, it is characterised in that the side
Method is still further comprised：
Design temperature deviation；
Judge whether temperature of the measurement value is more than set temperature value ± temperature deviation value；
Such as judge to set up, display shows and converts rh value again；
Such as judge invalid, display display determines rh value.
3. a kind of relative humidity according to claim 1 and 2 is converted again display and control method, it is characterised in that institute
State temperature of the measurement value to be measured by dry-bulb temperature sensor, determine rh value and measured by direct capacitance relative humidity sensor.
4. a kind of relative humidity according to claim 1 and 2 is converted again display and control method, it is characterised in that institute
State measure rh value by temperature of the measurement value and determine wet-bulb temperature value calculate, the temperature of the measurement value and determine wet bulb
Temperature value is measured by dry/wet bulb temperature sensor.
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| CN201410123784.7A CN104950957B (en) | 2014-03-28 | 2014-03-28 | Display and control method for reconversion of relative humidity |
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| CN201410123784.7A CN104950957B (en) | 2014-03-28 | 2014-03-28 | Display and control method for reconversion of relative humidity |
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| CN104950957B true CN104950957B (en) | 2017-05-24 |
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| CN110954150B (en) * | 2019-11-07 | 2022-03-29 | 广东电网有限责任公司 | Self-checking method and device for sampling unit in moisture-proof device |
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| CN101029881A (en) * | 2007-03-23 | 2007-09-05 | 浙江大学 | Method for measuring and controlling assembled air-conditioner dew point |
| CN101641591A (en) * | 2007-04-04 | 2010-02-03 | 爱斯佩克株式会社 | Hygrometer, and dew-point instrument |
| JP2012083206A (en) * | 2010-10-12 | 2012-04-26 | Espec Corp | Dew point meter, hygrometer, dew point derivation apparatus, humidity derivation apparatus, dew point measuring method and humidity measuring method |
| CN103213693A (en) * | 2013-01-25 | 2013-07-24 | 北京空间飞行器总体设计部 | Independent temperature and humidity control method based on absolute moisture content humidity control |
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2014
- 2014-03-28 CN CN201410123784.7A patent/CN104950957B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1101129A (en) * | 1994-01-06 | 1995-04-05 | 广东省肇庆化工机械厂 | Instrument for detecting pressure leak source |
| WO2005050259A1 (en) * | 2003-11-18 | 2005-06-02 | Vaisala Oyj | Correction of humidity measurement results of a radiosonde |
| JP2005062199A (en) * | 2004-10-01 | 2005-03-10 | Espec Corp | Calibration method for humidity sensor, and humidity sensor using it |
| CN101029881A (en) * | 2007-03-23 | 2007-09-05 | 浙江大学 | Method for measuring and controlling assembled air-conditioner dew point |
| CN101641591A (en) * | 2007-04-04 | 2010-02-03 | 爱斯佩克株式会社 | Hygrometer, and dew-point instrument |
| JP2012083206A (en) * | 2010-10-12 | 2012-04-26 | Espec Corp | Dew point meter, hygrometer, dew point derivation apparatus, humidity derivation apparatus, dew point measuring method and humidity measuring method |
| CN103213693A (en) * | 2013-01-25 | 2013-07-24 | 北京空间飞行器总体设计部 | Independent temperature and humidity control method based on absolute moisture content humidity control |
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