Refrigeration working principle of high and low temperature environmental test chamber
The high and low temperature environmental test chamber can be used to assess and determine the adaptability of electrical, electronic products or materials to temperature cycling and storage and use under low temperature conditions on the surface of the product. The equipment uses forced air circulation to maintain uniform temperature in the work chamber. In order to limit the influence of radiation, the difference between the temperature of each part of the inner wall of the equipment and the temperature specified in the test is not more than 8%, and the test sample is not directly irradiated by the heating and cooling elements in the equipment. Reference standard: The low temperature test chamber meets the requirements of GB/T2423.1-2008 Test A "Cryogenic Test Method"; GB/T2423.2-2008 Test B "High Temperature Test Method" and other relevant standards, can carry out various high and low temperature environments test. How refrigeration works The refrigeration cycle adopts an inverse card cycle, which consists of two isothermal processes and two adiabatic processes. The process is as follows: the refrigerant is adiabatically compressed to a higher pressure by the compressor, and the work is exhausted to increase the exhaust gas temperature. The refrigerant is then isothermally exchanged with the surrounding medium via a condenser to transfer heat to the surrounding medium. After the refrigerant is adiabatically expanded by the shut-off valve, the temperature of the refrigerant is lowered. Finally, the refrigerant absorbs heat from the higher temperature object isothermally through the evaporator, so that the temperature of the object to be cooled is lowered. This cycle is repeated to achieve the purpose of cooling. Anesthesia Medical Co., Ltd. , https://www.jssinoanesthesia.com