JPS6239766B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a humidity controller that controls humidity.

Conventionally, to control humidity, a temperature/humidity converter converts the dry bulb temperature and wet bulb temperature of the target into a dry bulb temperature signal and a relative humidity signal, and a controller compares the relative humidity signal with a set value. I was trying to get the adjustment signal by doing so. Alternatively, the wet bulb temperature input signal is input to the controller, and a conversion table is used to find and set the wet bulb temperature to obtain the desired controlled humidity, thereby obtaining the controlled output signal. However, this method requires separate temperature/humidity converters and controllers, requires connections between devices, requires a large storage space, is complicated, and has the drawbacks of high cost.

In view of the above points, an object of the present invention is to provide a humidity controller that can control humidity with a single controller and can be miniaturized.

FIG. 1 is a block diagram showing an embodiment in which the present invention is applied to a temperature/humidity controller. In the figure, input terminals 11 and 12 are supplied with a dry bulb temperature input signal T _D and a wet bulb temperature input signal T _W measured by a temperature/humidity transmitter, respectively, and an input signal 1
3 and 14 are supplied with a remote dry bulb temperature setting input signal T _SD and a remote wet bulb temperature setting input signal T _SW (or relative humidity signal T _RH ) from an external source such as a program signal generator, and these input signals are input. The signals are taken in by switching the switches S ₁ , S ₂ , S ₃ , and S ₄ of the changeover device 2 and converted into digital signals by the AD converter 3 . In addition, the display 5 is set by the setting device 4.
The dry bulb temperature value T _D ', the relative humidity value T _RH ' or the remote setting input signal is manually set with reference to Ru. The central processing unit 6 receives a dry bulb temperature input signal T _D and a wet bulb temperature input signal T _W which are taken in by the input switch 2 and converted into digital signals by the A-D converter 3 according to a predetermined operation program. For example, calculation is performed from the dry bulb temperature value T _D ′ and the relative humidity value T _RH ′, which are the settings stored in the memory 7 that have been manually set by the setting device 4, and the adjustment signal is output from the adjustment output unit 8. Output and set values T _D ′, T _R
A switching signal can be output from the switching signal output section 9 in accordance with _H '.

FIG. 2 is a block diagram for explaining the operation. A-D
The dry bulb and wet bulb temperature input signals T _D and T _W converted into digital signals by the converter 3 are subjected to input calculations such as linearization by the central processing unit 6, and relative humidity is calculated from both signals. During local operation, the local L dry bulb temperature value T selected and set by the setting device 4
_D 'Wet bulb temperature value T _RH ' or during remote operation, the remote R setting input signals T _SD , T _RH are compared with the dry bulb temperature T _D and the relative humidity calculation value and adjusted to the heater or humidifier, etc. A signal is output. Further, the dry bulb temperature signals of the input signals T _D and T _W and the relative humidity signal obtained by calculating the relative humidity can be outputted in analog form to the outside and recorded on a recorder or the like.

FIG. 3 is a block diagram for explaining another operation.
The dry bulb and wet bulb temperature input signals T _D and T _W converted into digital signals by the A-D converter 3 are sent to the central processing unit 6.
Input calculations such as linearization are performed by setting device 4.
The wet bulb temperature is calculated from the local L dry bulb temperature value T _D ' and the relative humidity value T _RH ' set by .
The local L dry bulb temperature value T _D ′ selected and set by the setting device 4, the wet bulb temperature calculation value or the remote R setting input signals T _SD , T _SW and the dry bulb and wet bulb temperature input signals T _D , T _W are compared and calculated, and an adjustment signal is output to a heater, humidifier, etc. or,
The dry bulb temperature signals of the input signals T _D and T _W and the calculated relative humidity signals can be output as analogs to the outside and recorded with a recorder or the like.

FIG. 4 is a block diagram illustrating the operation of a constant temperature and humidity chamber to be controlled. As shown in FIG. 5, in general, as the temperature increases, the relative humidity tends to decrease.
The constant temperature and humidity chamber 10 has a heater 11, a humidifier 12, and several compressors 13.
Since the evaporator 14 is operated by
It is necessary to switch the refrigerating capacity of the evaporator 14 and the dehumidifying capacity of the evaporator 14. Therefore, the central processing unit 6 outputs adjustment signals for the heater and humidifier, and also outputs a refrigerating capacity switching signal for selecting the size of the compressor 13 in accordance with the dry bulb temperature set value T _D '.
Dry bulb temperature set value T _D ′ and relative humidity set value T _RH ′
A dehumidification capacity switching signal is output to select the size of the evaporator 14 depending on the temperature and humidity of the object to be controlled.

Further, as shown in FIG. 6, the setter 4 stores a program pattern of stepped dry-bulb temperature values and relative humidity values in the memory 7 along with time intervals for holding them. It is possible to perform calculations based on the settings stored in 7 and the input signal and output an adjustment signal according to the program pattern.

In addition, in the above embodiment, calculation of relative humidity,
The wet bulb temperature is calculated using, for example, the following Pernter's equation, which is stored in advance in the memory 7.

H=e/eS×100 (%RH) ……(1) e=eW−AP(1+T _W /C)(T _D −T _W )
...(2) where H: relative humidity (T _RH etc. in the above example): saturated water vapor pressure of air eW: saturated water vapor pressure at wet bulb temperature eS: saturated water vapor pressure at dry bulb temperature T _W : wet bulb temperature T _D : Dry bulb temperature P: Air pressure A, C: Constant determined by wind speed. This humidity controller is configured such that a central processing unit performs calculations from both signals and a relative humidity value set by a setting device, and outputs an adjustment signal.

Therefore, there is no need for a conventional temperature/humidity converter and controller; dry bulb temperature and wet bulb temperature signals can be input using a single controller, and settings can be made using relative humidity values, making it easy to handle. , it is possible to downsize, the area occupied by the panel etc. is small, there is almost no need for wiring connections, and an inexpensive and highly reliable humidity controller can be realized. Furthermore, since it is a digital type using a central processing unit such as a microcomputer, highly accurate settings and adjustments are possible.

[Brief explanation of the drawing]

Fig. 1 is a block configuration diagram showing one embodiment of the present invention, Figs. 2, 3, and 4 are block diagrams for explaining the operation, Fig. 5 is a diagram of the relationship between temperature and relative humidity, and Fig. 6 is an explanatory diagram of a program pattern. 11, 12, 13, 14...Input terminal, 2...Input switch, 3...A-D converter, 4...Setting device, 5...Display device, 6...Central processing unit, 7...Memory device, 8...Adjustment output Section, 9...Switching signal output section.

Claims (1)

[Claims] 1. An input switch that takes in a dry bulb temperature input signal and a wet bulb temperature input signal, and A that converts both of the signals taken in by the input switch into a digital signal.
- Calculates the relative humidity from the D converter, the setting device for setting the relative humidity value, the dry bulb temperature input signal and the wet bulb temperature input signal converted into the digital signals, and compares it with the relative humidity value of the setting device. A humidity controller comprising a central processing unit that outputs a control signal. 2. A humidity controller characterized in that the setting device can be set digitally.