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2. cascade refrigerator is usually composed of two separate refrigeration systems, called high temperature and low temperature. The high temperature part uses the medium temperature refrigerant, the low temperature part uses the low temperature refrigerant. The evaporation of refrigerant in high temperature part of the system is used to cool the refrigerant in cryogenic part of the system. It uses a condensing evaporator to connect the two parts. It is both the evaporator of the high temperature part and the condenser of the low temperature part. The refrigerant in the low temperature part absorbs heat from the evaporator to the cooled object, that is, the cooling capacity, and transfers the heat to the high temperature part of the refrigerant, and then transfers the heat to the cooling medium (water or air) by the high temperature part of the refrigerant.
3.In the high and low temperature test, the cooling effect is selected at zero -40 C (high and low temperature test case single stage refrigeration). and when the temperature needs to continue to decline, the latter is selected (high temperature test box cascade refrigeration). In addition to the high demand for refrigeration speed (rapid temperature change) also used cascade refrigeration. It is suggested that, for the high and low temperature test cases with heat load, cascade refrigeration is generally used, which effectively counteracts the heat saving of the sample. In the manufacture of equipment, the cascade refrigeration technology is more complex, and the requirements of the refrigeration welding process are high. Dongguan baoyuantong china-baoyt.com continues to bring you more information technology of high and low temperature test box.