JPS6239768B2 - - Google Patents

Description

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

Conventionally, in order to control temperature and humidity, the dry bulb temperature and wet bulb temperature of the control target are converted into a dry bulb temperature signal and a relative humidity signal using a temperature/humidity converter.
The input signals were input to two separate temperature and humidity controllers, and compared with set values to obtain a control output signal. Alternatively, directly input the dry-bulb temperature signal and wet-bulb temperature signal to two separate controllers, look at a conversion table, etc., find the wet-bulb temperature to achieve the desired controlled humidity, and set the controlled output signal. I was trying to get it. However, this method requires at least two controllers, requires many 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 temperature/humidity controller that can control temperature and humidity with one controller and can be downsized.

FIG. 1 is a block diagram showing an embodiment of the present invention. 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., and input terminals 13 and 14 are supplied with a remote dry bulb temperature input signal T D and a wet bulb temperature input signal T W} measured by a temperature/humidity transmitter, etc. A temperature setting input signal T _SD and a remote wet bulb temperature setting input signal T _SW (or relative humidity signal T _RH ) are supplied, and these input signals are sent to the switches S ₁ , S ₂ ,
The signal is taken in by switching S ₃ and S ₄ and converted into a digital signal by the AD converter 3. or,
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 unit 6 such as a microcomputer is set manually. is stored in the storage device 7. 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 setting contents manually set by the setting device 4 and stored in the memory device 7, and an adjustment signal is output from the adjustment output unit 8. However, a switching signal can be outputted from the switching signal output section 9 according to the set values T _D ' and T _RH '.

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+Tw/c)( _TD - _TW )...(2) where H: relative humidity (in the above example, _TRH etc.) 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: Depends on wind speed As described above, in the present invention, an input switch receives a dry bulb temperature input signal and a wet bulb temperature input signal, converts it into a digital signal using an A-D converter, and sets the above two signals and the central processing unit. This is a temperature/humidity controller that performs calculations from the dry bulb temperature value and relative humidity value set by the device and outputs an adjustment signal.

Therefore, there is no need for a temperature/humidity converter or two controllers as in the past, and the dry bulb temperature and wet bulb temperature signals can be input using one controller, and settings can be made using temperature and relative humidity values. The present invention is easy to handle, can be made compact, occupies less space for panels, etc., requires almost no wiring connections, and can realize an inexpensive and highly reliable temperature/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, 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.
- a D converter, a setting device for setting a dry bulb temperature value and a relative humidity value, and a setting device for calculating relative humidity from the dry bulb temperature input signal and wet bulb temperature input signal converted into the digital signals, and calculating the relative humidity of the setting device. A temperature/humidity controller comprising a central processing unit that outputs an adjustment signal in comparison with a humidity value. 2. The temperature/humidity controller according to claim 1, wherein the setting device can be set by either a remote setting signal from the outside or manual setting. 3. The temperature and humidity controller according to claim 1, wherein the dry bulb temperature signal and the relative humidity signal can be outputted externally in analog form. 4. The temperature/humidity controller according to claim 1, wherein the setting device is capable of setting digitally.