Study on Non-Freon Air Cooling System Using Water Refrigerant

This paper aims for construction of a small, clean air cooling system using a water refrigerant and examines it experimentally. We offer a basic report for realization of the non-Freon air-cooling system using only water as a refrigerant. An experimental device consists of two groups, the first stage is composed a vacuum pump and a vacuum container of about 60 [liter] in volume, and the second stage has two heat exchangers (one is a heat load) and a water circulation pump. The variations of temperatures at each place are measured by thermocouples. An air-conditioner indoor unit or a heater as the heat load is used; the air conditioning measurement and the energy are measured, respectively. Consequently, in air-cooling system used only water refrigerant, the ability to cool a room air enough is provided. The development of a new vacuum pump which can exhaust a large amount of water vapor is introduced as an appendix.