Abstract
Water can be considered as natural refrigerant, which is ideal for sustaining the global environment, though the practical application to refrigerators has been restricted to large scale ice water mixture making for special use. The use of water, due to its large latent heat, is expected to realize a high COP refrigerator, and on the other hand, such refrigerators may become larger than the other types of refrigerator. The present paper describes the characteristics of water as refrigerant, and proposes a unique water-refrigerant based refrigerator with its compactness identical to the conventional ones.
