Abstract
"Cooling by radiation at night in Phoenix Arizona" is the purpose of this work. The top side of a water container is
exposed to the sky in order to dissipate the heat from water to sky by radiation. In order to enhance the heat transfer from water to sky, the bottom side of the water container is exposed to the sky indirectly via a 2.3 m diameter satellite dish. Copper tube with diameter 0.5 inch approximately 150 mm long is used as the container. This tube has been welded to copper base and paint it black. Closed cell copper foam is used as insulation around the tube. The test has been done from 7:30 pm in Phoenix Arizona residential area. Small temperature difference of the reservoir of water is seen compare to ambient temperature. Theoretical study has been done and the results are compared with test results. As development
plan, surface area to sky and dish will be increased to enhance the heat loss from water to sky by radiation. In
addition, methods to decrease the heat transfer from ambient to water will be considered.
