JPS6239767B2 - - 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 costs.

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 respectively 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, etc.
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 The signals are taken in by switching the switches S ₁ , S ₂ , S ₃ , and S ₄ of the input selector 2 and converted into digital signals by the AD converter 3 . Further, the dry bulb temperature value T _D ′, the relative humidity value T _RH ′, or the remote setting input signal is manually set by the setting device 4 with reference to the display 5, and the central processing such as a microcomputer is used. It is stored in the memory 7 by the device 6. 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, the dry bulb temperature value T, which is the setting content manually set by the setting device 4 and stored in the memory device 7.
A calculation is made from the relative humidity value T _{RH ′} and the relative humidity value T RH ′, and an adjustment signal is output from the adjustment output section 8 to set the set values T _D ′ and T _RH ′ _.
A switching signal can be outputted from the switching signal output section 9 according to the switching signal.

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 relative humidity calculation value, and sent to the heater or humidifier, etc. An adjustment 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 for explaining the operation of a constant temperature and humidity chamber as a control object. 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) e: 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 As described above, this invention takes the wet bulb temperature input signal with the input switch and converts it into a digital signal with the AD converter. In this humidity controller, a central processing unit performs calculations from the input signal and the dry bulb temperature value and relative humidity value set by the setting device, and outputs an adjustment signal.

Therefore, there is no need for a conventional hot and wet bulb temperature converter and controller, and a single controller can input dry bulb temperature and wet bulb temperature signals, and settings can be made using temperature and relative humidity values. It is easy to handle, can be miniaturized, occupies less space for panels, etc., and almost eliminates the need for wiring connections, making it possible to realize an inexpensive and highly reliable humidity controller. 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 wet bulb temperature input signal;
An A-D converter that converts the wet bulb temperature input signal taken in by this input switch into a digital signal, a setting device that sets a dry bulb temperature value and a relative humidity value, and a dry bulb temperature value of this setting device. and a central processing unit that calculates a wet bulb temperature from a relative humidity value, compares it with the wet bulb temperature input signal converted into the digital signal, and outputs an adjustment signal. 2. The humidity controller according to claim 1, wherein the setting device is capable of setting digitally.