At present, the cryostat refrigeration method of the temperature shock test chamber is often cooled by a steam compressor or air.
Air refrigeration and steam compressor refrigeration have the following advantages: high refrigeration coefficient at lower temperature, easy to obtain lower temperature, wide temperature range; not sensitive to equipment leakage, small leakage has little effect on refrigeration performance, The refrigeration performance is relatively stable; the refrigerant is air, which has no harm to the environment; the operation is reliable, the operation is simple, the maintenance is convenient, and the operation cost is low.
For larger temperature shock test chambers, the temperature change speed is required to be faster, and air cooling is a better choice. The positive boost refrigeration method uses a secondary expansion of a turbo expander to increase the expansion ratio of the turbine, increase the temperature drop of the turbine, and improve the refrigeration capacity.
Air refrigeration and steam compressor refrigeration have the following advantages: high refrigeration coefficient at lower temperature, easy to obtain lower temperature, wide temperature range; not sensitive to equipment leakage, small leakage has little effect on refrigeration performance, The refrigeration performance is relatively stable; the refrigerant is air, which has no harm to the environment; the operation is reliable, the operation is simple, the maintenance is convenient, and the operation cost is low.
For larger temperature shock test chambers, the temperature change speed is required to be faster, and air cooling is a better choice. The positive boost refrigeration method uses a secondary expansion of a turbo expander to increase the expansion ratio of the turbine, increase the temperature drop of the turbine, and improve the refrigeration capacity.
The positive boosting refrigeration method has a high cooling coefficient, good regulation performance, stable cooling performance, stable start-stop and regulation process, and the advantages of installed power, operating energy consumption and equipment investment. The system adopts a positive boost refrigeration system.
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