Liquid gasification refrigeration
1, compression: normal temperature gas into high pressure and high temperature gas
2, condensation: high pressure and high temperature gas into a high-pressure liquid
3, evaporation: high pressure liquid into a low pressure gas, heat, to achieve refrigeration.http://www.szdxj.com
Two, gas expansion refrigeration
Air expansion refrigeration is the use of high-pressure gas adiabatic expansion to achieve low temperature, and the expansion of gas at low pressure heat recovery process to refrigeration, due to gas adiabatic expansion of the different devices. In general, there are two ways: one is the high-pressure gas by expansion, Waigong output, because of a large drop in the temperature of the gas, complex thermal cooling capacity is large, but the expansion machine structure more complex, another way is that gas through the throttle valve expansion, no Waigong output, reducing the temperature of the gas, cooling capacity is small, but throttle valve structure is relatively simple, easy to regulation of gas flow.
Three, thermoelectric refrigeration
The charge carriers move to form an electric current in a conductor, because the charge carriers are at different levels in different materials, and when they want to move from the high energy level to the low energy level, the excess heat is released. On the contrary, it needs to absorb heat from the outside world (that is, the performance of refrigeration).http://www.szdxj.com