Refrigeration equipment is a refrigeration machine combined with a facility that uses cold. The design and construction of refrigeration equipment is to effectively use the cold to refrigerate food or other items; in low temperatures for product performance tests and scientific research tests; in industrial production to achieve certain cooling processes, or air conditioning. Items in the cooling or freezing to give off a certain amount of heat, refrigeration unit of the enclosure will also be used in the use of a certain amount of heat transfer. Therefore, in order to maintain the low temperature conditions in the refrigeration unit, it is necessary to install a chiller in order to continuously remove these heat, or the use of ice melting or sublimation of dry ice to absorb these heat.