The current international "Waterproof Cooling Fan" energy shortage, electricity shortage has occurred frequently in recent years, domestic, energy-saving features will be a direction of development can not be ignored. Potential evaporation principle Working positioned between the air conditioner and fan air-conditioning fan with water as the medium, the use of phase change material absorbs heat and water law, "Waterproof Cooling Fan" can send cold air below room temperature, while the built-in conventional electric sources can send warm and humid air. In addition, with "Waterproof Cooling Fan" or the use of solar energy as an energy saving and environmental protection will also be a fan promotion and application of the larger efforts in the future.