JPH01296152A - Temperature/temperature difference type ventilated psychrometer - Google Patents

Abstract

PURPOSE:To enable control of humidity due to a dry/wet temperature difference, by arranging a dry/wet temperature section made up of a metal cylinder which has temperature measuring contacts at both ends of a thermopile or a thermocouple separately to measure humidity from a dry temperature and a dry/wet temperature difference. CONSTITUTION:Air of a desired space intended to measure a temperature is sucked into a measuring cylinder 1 with a ventilator 4 and a dry temperature thereof is measured with a resistance thermometer having a resistance thermometer bulb within a metal cylinder 7. Then, a difference between the dry temperature and a wet temperature is measured with a thermopile or a thermocouple having one temperature measuring contact within a metal cylinder 5 with the surface thereof wetted by a gauze 6 suspended in a water bulb 2 and the other temperature measuring contact housed within the metal cylinder 7. Data of the dry temperature and a difference between the dry and wet temperatures as measured with above devices are amplified 8 and a humidity is calculated with an arithmetic device 9 from the data to be displayed 10. In addition, an output of the device 9 is sent to a controller 11 as required to perform a temperature control in a desired space.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a temperature/temperature difference type ventilation psychrometer.

[Conventional technology]

Ventilation psychrometers are the most reliable of all hygrometers and are therefore desirable for use in measuring and controlling humidity. Furthermore, humidity control is almost always performed simultaneously with temperature control.

With a ventilation psychrometer, humidity can be determined by measuring the temperature of the air (i.e., dry temperature) and the difference between dry and humid temperatures. (This is because the partial pressure of water vapor is known by the psychrometer formula.) Also, is it determined by the dew point (i.e. by the partial pressure of water vapor) in the ventilation psychrometer? The degree of Wt can be controlled.

As you can see from the humidity table for ventilation psychrometers, the relative humidity is determined by the temperature (dry temperature) and the difference between dry and wet temperatures.
Relative humidity is determined mainly by the difference between dry and wet temperatures, and although it depends on temperature, the influence of dry temperature is small. Therefore, if humidity is controlled using the dry/humid temperature difference as a parameter instead of relative humidity, the control will not be independent of temperature control, but will be close to it. Furthermore, control based on the dry/wet temperature difference is more convenient than control based on the dew point.

Therefore, for controlling temperature and humidity using this method, it is convenient to use an electric ventilation psychrometer that can directly measure temperature (dry temperature) and the difference between dry and wet temperatures. has not been proposed yet.

Furthermore, the minimum wind speed required for a psychrometer (the difference in dry and wet temperatures depends on the wind speed, but if the wind speed is large enough, it does not depend on the wind speed. The minimum value of the wind speed that makes the difference in dry and wet temperatures independent of the wind speed)
Although it is desirable that the value be small, conventionally known products are insufficient in this respect as well.

[Problem that the invention seeks to solve]

The present invention has been made based on the above-mentioned viewpoints, and its purpose is to provide a temperature/temperature difference type ventilation drying/humidifying system that requires a small minimum wind speed and is suitable for controlling humidity using the dry/humid temperature difference. The objective is to provide a measurement system.

[Means for solving problems]

The above object can be achieved by a temperature-temperature differential ventilation psychrometer in which the humidity and temperature part is a thermopile or a metal cylinder containing only one temperature-measuring junction of a thermocouple.

The other temperature-measuring junction of these thermopile or thermocouples is placed near a thermometer for measuring dry temperature, such as a platinum resistance thermometer, a semiconductor thermometer, or the like.

[For production]

The temperature/temperature difference type ventilation psychrometer with the above configuration can directly measure the dry temperature and the difference in dry and wet temperatures, and the required minimum wind speed is small, so it is not only highly accurate as a hygrometer, but also It is suitable for controlling humidity, and humidity control can be performed more easily than conventional dew point control.

〔Example〕

Hereinafter, the configuration of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is an explanatory diagram showing the basic configuration of an embodiment of a temperature/temperature difference type ventilation psychrometer according to the present invention.

In the figure, 1 is a measuring tube, 2 is a water pot attached to its lower end, 3 is water, 4 is a ventilation device for discharging the air taken in from the upper end of the measuring tube 1, and 5 is a thermopile or thermocouple inside the tube. 6 is a gauze hanging from around the metal cylinder 5 into the water jar 2 in order to wet the surface of the metal cylinder 5, and 7 is a resistance thermometer inside the metal cylinder for measuring temperature. a metal cylinder housing a resistor and the other temperature measuring junction of the thermopile or thermocouple; 8 is an amplifier; 9
is a calculation device, 10 is a display device, 11 is a control device,
The metal cylinder 5 constitutes a humidity temperature section, and the other metal cylinder 7 constitutes a dry temperature section.

The air in the desired space whose humidity is to be measured is drawn into the measuring cylinder 1 by the ventilation device 4, and its dry temperature is measured by a resistance thermometer having a resistance temperature detector housed in the metal cylinder 7. The difference between temperature and humidity temperature can be determined by a thermopile or thermocouple, in which one temperature-measuring junction is housed in the metal cylinder 5 (humid temperature part) and the other temperature-measuring junction is housed in the metal cylinder 7 (dry temperature part). It is designed to be measured by

Therefore, data regarding the dry temperature measured by the resistance thermometer and data regarding the difference between the dry and wet temperatures measured by the thermopile or thermocouple are inputted to the arithmetic unit 9 via the amplifier 8, and the humidity is calculated from these data. This equation is well known, so its explanation will be omitted.

Based on the output of the arithmetic device 9, the determined humidity is displayed on the display device 10. Further, if necessary, the output of the arithmetic unit 9 is sent to a control device 11 that adjusts the humidity by sending moisture or dry air to the space whose humidity is to be controlled, thereby controlling the humidity of the space.

The required minimum wind speed for this ventilation psychrometer is approximately 0.25 cm, which is approximately 1/20 of the minimum wind speed (5 m/s) of the Assmann ventilation psychrometer.

[Effects of the Invention] Since the present invention is constructed as described above, when using the present invention, humidity can be directly measured based on the dry temperature and the difference between the dry and wet temperatures, and the required minimum wind speed is small, so the humidity due to the dry and wet temperature difference can be measured directly. It is suitable for controlling humidity, making it easier to control humidity than conventional dew point control.

It should be noted that the present invention is not limited to the above-mentioned embodiments,
For example, dry temperature measuring means, measuring cylinder 1 and metal cylinders 5 and 7.
, the water jar 2, etc., may be modified as necessary, and the present invention includes all modifications that can be easily deduced by a person skilled in the art from the above description within the scope of its purpose. It is inclusive.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the basic configuration of an embodiment of a temperature/temperature difference type ventilation psychrometer according to the present invention. 1・--1----------・---1--・-Measurement cylinder 2
−−−−−−−−−−−−−−・ Water pot 3−−−−−
-------------
−−−−−−−−−−−−−1・−Metal cylinder (humidity temperature part) 6・−−1−−−・−・−−−1−−−−−−
-----Gauze 7-----111-----
−・−−−1・Metal cylinder (dry temperature part) 8−−m=−−−
−・−・−・・・−・・−1−−−−Amplifier 9−−−−
−−−−・−−1−−−−・・−・・−・−Arithmetic device 1
0-----1・--・-・--・-・・--m-Display device 11--1--
---Control equipment patent applicant Shisaka Institute Co., Ltd.

Claims (1)

[Claims] (1) A temperature/temperature difference ventilation psychrometer in which the humidity and temperature part is a thermopile or a metal cylinder containing only one temperature measuring junction of a thermocouple.