JPH04194728A - Environmental test device - Google Patents

Abstract

PURPOSE:To enable control at a high humidity region at a low temperature to be performed highly accurately by providing a low-temperature humidifying chamber in front of an introduction entrance of a test chamber of an air-supply device. CONSTITUTION:For controlling an air at a state A which is discharged from an air-conditioning chamber to a test chamber 4 at a humidity of 100% RH, temperature and humidity in a state A are maintained by feeding back an amount of humidification to an air where an external air in a state F is dehumidified to a state G by an air dehumidifying machine 3 for circulation air which is in the state G or a cooling state E through a sample 5, a blower 6, a cooling coil 7, and a heater 8 and by introducing air which is turned into a state H by a humidifying chamber 1. Also, an amount of humidification at the low-temperature humidifying chamber 1 is adjusted and a fresh air which is controlled between H and H' is mixed with a circulation air in the state E, thus enabling a value of an absolute temperature x at a temperature (t) to be controlled from A to A'. Therefore, a high-humidity range at a low temperature can be controlled highly accurately.

Description

[Detailed description of the invention] [Industrial application field] TECHNICAL FIELD The present invention relates to an environmental testing device.

[Conventional technology]

The conventional environmental test equipment is Refrigeration and Air Conditioning Technology VOL.

26 Kan 304 (June 1975 issue), pages 95 to 1
As described on page 03, only humidity control using room temperature acid was carried out from about -5°C, and humidity in the lower temperature range was as expected.

[Problem to be solved by the invention]

The above-mentioned conventional technology does not give consideration to reproducing the high humidity state at low temperatures, and the humidification method using the humidifier of the main air conditioner has the problem that only room temperature acid humidity control can be performed.

An object of the present invention is to provide an environmental test device that can control high-humidity acid with high precision at low temperatures.

[Means to solve the problem]

In order to achieve the above object, a low-temperature humidification chamber consisting of a chamber and a spray tree is provided in the system of an air supply system that processes outside air to a low dew point and introduces it into the test chamber.

[Effect]

The low-temperature humidification chamber humidifies fresh air obtained by treating outside air to a low dew point during a low-temperature and high-humidity test, and when this air is introduced into the test chamber, it operates as if the room were humidified. This makes it possible to realize humidity control at low temperatures.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. 1 is a low temperature humidification chamber, 2 is an air supply device, 3 is an air dehumidifier, 4 is a test chamber, and 5 is a specimen.

6 is an air conditioning blower, 7 is a cooling coil, 8 is a heater, 9 is an exhaust device, 10 is a humidity detector, 11 is a humidity controller, 12 is a humidification control valve, and 13 is a steam pipe, which allows low temperature humidity control. A functional environmental test device is constructed.

In order to control the air in state A blown from the air conditioner into the test chamber 4 at a humidity of 100%, the specimen 5 and the blower 6 must be
．． For the circulating air that has been heated and cooled to state E through the cooling coil 7 and heater 8, the outside air in state F is dehumidified to state G by the air dehumidifier 3, and then the humidity detector 10 and humidity The temperature and humidity in state A can be maintained by feeding back the amount of humidification with the regulator 11 and introducing air in state H into the humidifying chamber 1.

In addition, by adjusting the amount of humidification in the low-temperature humidification chamber 1 and mixing fresh air controlled between H and H' with the circulating air in state E, the value of absolute humidity X at temperature t can be adjusted to A.
It can be controlled within the range from A' to A'.

According to this embodiment, it is possible to reproduce a high humidity state at a low temperature with high accuracy, and there is also an effect of preventing a supersaturated state of air that would occur when humidifying directly with the main air conditioner.

〔Effect of the invention〕

According to the present invention, by providing a low-temperature humidifying chamber in the air supply system, humidity control at low temperatures can be achieved with high precision.

In addition, since it humidifies indirectly, it is effective in preventing oversaturation of the air.

[Brief explanation of the drawing]

FIG. 1 is a theoretical cycle of an environmental test apparatus equipped with a low temperature and humidity control function according to an embodiment of the present invention, and FIG. 2 is an psychrometric diagram showing changes in the state of air due to the cycle of FIG. 1... Low temperature humidification chamber, 2... Air supply device, 3...
・Air dehumidifier, 4...Test chamber, 5...Specimen, 6.
・Air conditioning blower, 7... Cooling coil, 8... Heater,
9... Exhaust device, 10... Humidity detector, 11... Humidity controller, 12... Humidification control valve, 13... Steam piping. History Part 1 No. 2

Claims (1)

[Claims] 1. Introducing an air supply system into the test room in an environmental test equipment consisting of a test room and an air conditioner that controls the temperature and humidity in the test room, an air supply system that introduces fresh air into the room, and an exhaust system that exhausts excess air. An environmental test device characterized by a low temperature humidification chamber installed in front of the mouth.