Abstract
An original thermal solar-panel is studied as a useful device for effectively utilizing solar thermal energy. Decompression-boiling system can perform as an efficient heat-transport device with almost no heat loss because of the compound heat transfer process of boiling water at low pressure and latent-heat transport with small temperature difference. This system is expected to be applied not only for solar system but also in wider application using low temperature or small temperature difference resources. The indoor experiment proved that its high heat-transport performance of higher than 85 % even at high thermal-input of 1 kW/m^2 and its stable heat-transport performance by adding a surface-active agent into water.
