| 摘要 |
PURPOSE:To raise the ground temperature around a heating apparatus with a little heat quantity in high efficiency, by connecting an evacuated aboveground tank with an underground tank in such a manner as to freely circulate a working liquid between the tanks and inserting an electric heater in the aboveground tank. CONSTITUTION:An evacuated aboveground tank 1 is placed in parallel to an evacuated underground tank 2 and the top of the aboveground tank 1 is connected to the bottom of the underground tank 2 through a connection pipe 3 to enable free circulation of a volatile working liquid 4 (e.g. methanol) poured into the tanks. An electric heater 5 is inserted into the aboveground tank 1. The apparatus is embedded in a ridge 6 in a state to position the aboveground tank 1 above the ridge 6 and the aboveground tank 1 is heated with solar energy or the electric heater 5. The working liquid 4 is evaporated, introduced into the underground tank 2 in the form of vapor and condensed to form liquid in the tank 2 to release the latent heat and raise the ground temperature around the apparatus. |
