How to choose the refrigerant of high and low temperature impact test chamber

The choice of refrigerant plays a key role in the refrigeration system of high and low temperature impact test chambers, but the choice of refrigerant is a more complicated technical and economic problem. There are many factors to consider because the refrigerant is a consumable, generally high. After a few years of use of the low-temperature impact test chamber or the high-low temperature damp heat test chamber, the refrigerant is consumed and the refrigeration effect is not up to standard. Therefore, a comprehensive technical analysis should be carried out according to the specific conditions. It is best to find the original manufacturer for filling. Here are some tips for the selection of refrigerants for the Dongguan Ai Siwei Technology Department:

1. Refrigerant for high and low temperature impact test chambers must use refrigerants that comply with national environmental regulations. The high and low temperature impact test chambers produced by Dongguan Ai Siwei Test Equipment Co., Ltd. use R404A and R23 (environmentally friendly) refrigerants.

2. The high and low temperature impact test chamber should consider the nature of the refrigerant. According to the thermal, physical and chemical properties of the refrigerant, those refrigerants that are non-toxic, non-explosive and non-combustible should be selected; the refrigerant should be heat transfer and the resistance should be small. It has good compatibility with materials used in refrigeration systems. Therefore, for some industries regulated by the state, it is necessary to use a non-toxic, non-polluting, safe refrigerant cooling effect.

3. High and low temperature impact test chamber The refrigerant considers the type of compressor, and the working principle of different refrigeration compressors is different. The volumetric compressor increases the pressure by reducing the volume of the refrigerant vapor. Generally, a refrigerant having a large capacity per unit volume, such as R134a, R22, etc., is selected. There are many types of refrigerants. With the advancement of science and technology, new working fluids are constantly appearing to suit different refrigeration devices. The high and low temperature impact test chamber of Dongguan Ai Sihao Test Equipment Co., Ltd. uses Taikang compressor. Fully enclosed French Taikang 1.5HP × 2 × 1 group, cascade refrigeration, low temperature test is more accurate and more efficient.

4. High and low temperature impact test chamber refrigerant must also consider the cooling temperature requirements. According to different refrigerant temperature and cooling conditions, high temperature (low pressure), medium temperature (medium pressure) and low temperature (high pressure) refrigerants are selected. The standard evaporation temperature of the normally selected refrigerant is 10 ° C below the refrigeration temperature. The choice of refrigerant should also consider the cooling conditions, operating environment, etc. of the refrigeration unit. The condensing pressure during operation shall not exceed the values ​​specified for the safe use conditions of the compressor. The high and low temperature damp heat test chamber can be tested at a temperature of minus 60 ° C, so the refrigerant requirements are higher. Different from the automobile air-conditioning refrigerant in the society, the automobile refrigerant can only use the air outside the vehicle as the cooling medium, and the temperature, wind speed, solar radiation, heat radiation and other factors that affect it are frequently changed. It is decided that it can only use high temperature (low pressure) refrigerant. In the past, R12 was selected. At present, R134a is mostly used.

For more technical information about high and low temperature impact test chambers, please pay more attention to Dongguan Ai Siwei News Center.