The refrigerant in the refrigeration system is directly output and evaporated into the target control element (heat exchanger) for heat exchange, thereby cooling the target control object. The heat exchange capacity is generally more than 5 times higher than that of the fluid (gas) transported into the heat exchanger, which is especially suitable for applications where the heat exchange area of the heat exchanger is small but the heat exchange is large. It can also be used such as gas capture, the refrigerant is directly passed into the trap to evaporate, and through the condensation effect on the surface of the trap, it is quickly inferior to the gas in the air.