Low power micro spray cooling system

A piezoelectric micro-dispenser cooling system was used to solve the overheating problem that inside vehicles caused by solar radiation in summer. High temperature could lead failure or damaging of electronics and mechanical appurtenances of vehicles and causes a hot driver seat. Thus, it is an important research project to use a minimal power to cool down the temperature of vehicles. Since the temperature increases inside vehicles mainly from solar energy, we design a micro-cooling system could be operated by solar cell. If the exposure dose from sunlight is high, the formation of micro-spray droplet volume will also be high and enough to convert heat from solar energy by liquid evaporation. It could also be operated without any extra energy input. The measured data shows that temperature on the driver seat maintained at 46°C by the dispenser cooling system, instead of temperature rising up to 60°C at solar energy exposure doses as high as 1000 W/m² and the relative humidity inside vehicle did not increase. In addition, the cooling system required less than 2.0 watts of power at flow rate of 4.0 mL/min for the generation of micro-droplets.