Refrigerant selection R23 and R404 on the importance of programmable constant temperature and humidity test chamber refrigeration system
Refrigerant, common name snow species, scientific name refrigerant. In the environmental test chamber industry, refrigerant is called refrigerant.
Programmable constant temperature and humidity test box, low temperature refrigeration part is a very important part of its, is also a part of the Z prone to problems; Refrigerant as an indispensable part of cryogenic refrigeration, whether maintenance or refrigerant, technical staff need to have a certain understanding of refrigerant. The following by dongguan Haotian equipment for you to analyze refrigerant specific classification?
According to the standard evaporation temperature (atmospheric pressure), refrigerant can be roughly divided into three categories:
1, low temperature refrigerant: 30℃ Pk value of 20 ~ 70kg/cm2, standard evaporation temperature is ≤-50℃. Including R13, R14, R23, R503, methane, ethane, ethylene and so on.
2, medium temperature refrigerant: 30℃ Pk value is 3 ~ 20kg/cm2, standard evaporation temperature is < 0 ℃. Including R717, R12, R22, R500, R502, propylene, etc.
3, high temperature refrigerant: 30℃ Pk value is less than or equal to 3kg/cm2, the standard evaporation temperature is gt; 0 ℃. R11, R21, R113, R114, R142, etc.
But this is not true. There are two compressors in the constant temperature and humidity test chamber. The main compressor adds R404 refrigerant, and the auxiliary compressor adds R23 refrigerant.
The main compressor starts at about 80℃, that is to say, the refrigerant should be refrigerated at this temperature; That is to say, R404 is a high temperature refrigerant, but the problem is that the auxiliary compressor will not start until -20℃. R404 refrigerant should be cooled below 0 degrees. In this regard, R404 does not belong to any of these refrigerants.
If any question about how to select the refrigerant for your test chamber, you can feel free to contact us for suggestions.
BOTO GROUP will offer professional suggestion for you.