The principle of dry ice refrigeration is mainly based on the following points:
Sublimation process: Dry ice (solid carbon dioxide) will directly transform from solid to gas at room temperature and pressure, absorbing a large amount of heat during this process, resulting in a rapid decrease in the temperature of the surrounding environment.
Energy Conversion: Dry ice needs to overcome intermolecular attraction during sublimation, which consumes energy. Therefore, it absorbs heat from the surrounding environment to achieve cooling effect.
Application example: In practical applications, such as using dry ice to cool storage vehicles, dry ice first exchanges heat with air, and then circulates the cooled air inside the cabin through a ventilation fan. The carbon dioxide that absorbs heat and sublimates is discharged from the exhaust pipe outside the cabin, thereby maintaining the temperature inside the cabin.
These principles collectively ensure the widespread application of dry ice in the refrigeration field, especially in situations where rapid cooling is required.
