First, the constant temperature and humidity test chamber heating process

The temperature rise in the test chamber is mainly the use of high-power resistance wire. Because the temperature rise rate required by the test box is large, the temperature system of the test box is divided into two subsystems: humidification and dehumidification;

Second, the constant temperature and humidity test chamber cooling process

Cooling is cooling, the cooling mode of the test box is mechanical refrigeration and auxiliary liquid nitrogen refrigeration, mechanical refrigeration uses vapor compression refrigeration, they are mainly composed of compressor, condenser, throttling mechanism and evaporator, constant temperature and humidity test chamber if The temperature requirement of the larger cabinet is as low as -55 °C or below, and single-stage refrigeration is difficult to meet the requirements. Therefore, the cooling method of the test box generally adopts cascade cooling.

Third, constant temperature and humidity test chamber humidification process

The humidification process of the constant temperature and humidity test chamber actually increases the partial pressure of water vapor. The initial humidification method is to spray water to the wall of the constant temperature and humidity test chamber, and the water surface saturation pressure is controlled by controlling the water temperature. The water on the surface of the tank wall forms a large surface on which the water vapor pressure is added to the tank by means of diffusion to increase the relative humidity in the test chamber. This method appeared in the 1950s. Since the control of humidity at that time is mainly a simple switchover adjustment of the mercury-electric contact type conductivity meter, the control of the water temperature of the hot water tank with large hysteresis is poor, so the transition process of the control is long and cannot meet the alternating heat and humidity. The need for more humidification, and more importantly, when spraying the wall of the tank, it is inevitable that water droplets will drip on the sample to form different degrees of contamination on the sample.

Fourth, constant temperature and humidity test chamber dehumidification process

There are two ways to dehumidify the test chamber: mechanical refrigeration dehumidification and dry dehumidification.

1. The principle of dehumidification of mechanical refrigeration dehumidification is to cool the air below the dew point temperature, so that the water vapor larger than the saturated moisture content is condensed and precipitated, thus reducing the humidity.

2. Dehumidifier of the dryer uses the air pump to pump out the air in the test chamber, and injects the dry air. At the same time, the humid air is sent to the recyclable dry for drying. After drying, it is sent to the test chamber. Dehumidification is carried out.

Most of the constant temperature and humidity test chambers now use the former dehumidification method. The latter dehumidification method requires an additional dehumidifier or chemical dehumidification to achieve a dew point temperature of 0 °C. Suitable for occasions with special requirements, but at a relatively high cost

Health Ingredients

Health foods contain a certain amount of functional health ingredients, which can regulate the functions of the human body, have specific effects, and are suitable for specific groups of people. General food does not have specific functions, and there is no specific range of people to eat. Health food cannot be directly used to treat diseases. It is a human body mechanism regulator and nutritional supplement.


The human body needs many nutrients, such as water, protein, fat, carbohydrates, vitamins, minerals, dietary fiber,etc. Nutritional products are generally rich in these nutrients and suitable for everyone. Its nutritional value of health ingredients is very high and it is suitable for everyone to drink. While health food is food with specific health functions and only suitable for specific groups of people, and its nutritional value is not necessarily high. Therefore, the various nutrients that the human body needs are still obtained from three meals a day. Of course, health care products are better in some aspects. Health care products can obtain more fixed health functions than nutrition products. The minerals of the human body are not balanced, so health care products have a greater advantage in some aspects.

DHA, NMN, MCT, CLA, Melatonin, Creatine

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