In this case, the media in the KDP plate and shell heat exchanger are natural gas and refrigerant. The heat exchanger is used to precool the natural gas before liquefaction or to recover cold energy during regasification. The shell of the heat exchanger is made of stainless steel, which can withstand extremely low temperatures of 196°C. The design pressure can reach more than 80 bar, which is suitable for high-pressure natural gas conditions.