Before we talk about how to set up, we must first emphasize that the stable performance of the constant temperature and humidity test chamber is guaranteed 80% from the manufacturer's settings, parts selection, process and mature technology, and the other 20% depends on the user's correct maintenance And maintenance, which also includes the correct setting method and some simple tips. Above, Shanghai Linpin Instrument Co., Ltd. tells you, please visit:
The refrigeration system and the compressor are complementary. The minimum evaporation temperature of the single-stage vapor compression refrigerator is mainly determined by its condensing pressure and compression ratio:
1. For any refrigerant, the lower the evaporation temperature, the lower the evaporation pressure;
2. When the evaporating temperature is too low, some commonly used refrigerants have reached the freezing temperature, and the refrigerant flow and circulation cannot be achieved;
3. The evaporation pressure decreases, the volume of the refrigerant increases, and the mass flow of the refrigerant decreases. If you need to obtain the required cooling capacity, you must increase the suction volume to make the compressor volume too large;
The cooling and dehumidification of the test box are all done by the refrigeration system, but the same system can make the machine reach two different states. The parameter settings and test methods are user-definable, so reasonable and standardized use, according to the operating instructions Or use the operation video provided by our company to operate, it will be handy to use.
The medium-temperature refrigerant used in the single-stage refrigeration cycle in the constant temperature and humidity test chamber is R404A. Its evaporation temperature is -46.5 ℃ under one atmospheric pressure. Only a low temperature of -36.5 ° C can be made in the tank. If lower temperatures are required due to test requirements, the minimum evaporation temperature of the R404A refrigerant can be reduced to -50 ° C by lowering the evaporation pressure of the compressor. However, Lin Bin Instruments recommends that with the rapid development of the national economy, the customization of various national standards is becoming more and more strict, and the products are more destructive. Therefore, users must keep certain when purchasing test boxes The remaining amount is used for subsequent expansion experiments.
Setting method for stable performance of constant temperature and humidity test chamber
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