ABSTRACT
Cooling an object usually requires energy, such as electricity. However, if it were possible to cool an object without using energy, not only could energy be saved, but energy could also be generated using a thermoelectric module, which is commercially available. Electromagnetic waves are radiated from an object according to its temperature. Thus energy-free cooling is possible if we can solve the problem of discarding the radiated electromagnetic waves. This chapter provides a basic explanation of radiative cooling (RC). It also shows transparent RC materials that can be used for cooling buildings and solar cells. Furthermore, an electrical device that generates energy using it is described.
