JPS6239770B2 - - Google Patents

Description

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

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 inputs were input to two separate temperature and humidity controllers, and compared with the set values to obtain adjustment output signals to the heater and humidifier. Alternatively, the dry bulb temperature signal and the wet bulb temperature signal are directly input into two separate controllers, and the wet bulb temperature for the desired controlled humidity is determined and set by looking at a conversion table, etc. I was trying to get a control output signal to the humidifier. However, this method requires at least two controllers, many connections between devices, and a large storage space.
It has the drawbacks of being complicated and costly. Furthermore, as shown in FIG. 5, as the temperature increases, the humidity generally tends to decrease, and simply controlling the heater and humidifier causes energy loss and makes it difficult to achieve optimal temperature and humidity control.

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 and the dry bulb temperature T _D relative humidity calculation value are compared 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.

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/e _s ×100 (%RH) ……(1) e=e _W −AP (1+T _W /C) (T _D −T _W )
...(2) where H: Relative humidity ( _TRH etc. in the above example) e: Saturated water vapor pressure of air e _W : Saturated water vapor pressure at wet bulb temperature e _S : Saturated water vapor pressure at dry bulb temperature T _W : Humidity Bulb temperature T _D : Dry bulb temperature P: Air pressure A, C: Constant determined by wind speed As described above, this invention takes in the dry bulb temperature input signal and the wet bulb temperature input signal with the input switch, Convert to digital signal with D converter,
The central processing unit outputs adjustment signals for the heater and humidifier based on the above-mentioned signals and the dry bulb temperature value and relative humidity value set by the setting device, and also outputs a refrigerating capacity switching signal in accordance with the dry bulb temperature setting value. This is a temperature/humidity controller that outputs a dehumidification capacity switching signal according to the dry bulb temperature set value and the relative humidity set value.

Therefore, it is easy to handle because temperature and humidity can be controlled by inputting the dry bulb temperature and wet bulb temperature and setting the relative humidity value using a single controller using a central processing unit such as a microcomputer. It becomes possible to downsize and become inexpensive and highly reliable. In addition, it is possible to switch and select the size of the compressor and evaporator to achieve the optimal refrigerating capacity and dehumidifying capacity according to the temperature and humidity settings, allowing for highly accurate temperature and humidity adjustment and optimal control. Get results. Further, since there is no need to waste energy on a compressor, etc., significant energy savings can be achieved.
Also, since it can be automated rather than manually, operability is greatly improved.

[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, 10... Constant temperature and humidity chamber, 11... Heater, 12
...humidifier, 13...compressor, 14...evaporator.

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 this 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 outputting adjustment signals for the heater and humidifier from both set values of this setting device and the above-mentioned input signals, and a setting device for outputting adjustment signals for the heater and humidifier; and a central processing unit that outputs a refrigerating capacity switching signal in accordance with the dry bulb temperature value of the controller and a dehumidifying capacity switching signal in accordance with the dry bulb temperature value and relative humidity value of the setting device, A temperature and humidity controller that controls humidity.