Nowadays, use of natural energy can be exemplified by many methods, including solar energy(heat and light), ind power, hydro power, wave power and geothem. The amin process at these powe plants is to transform energy into electricity. However, there are some serious problems with these, suchas destruction of the natural envionment and high cost production facilities due to inconvenient transportation difficulties. Presently, the popular media ofgenerating electricity are thermal power, hydro power, and atomic energy. Unfortuntely, plant locations in Japan tned to be quite distant from consumption areas. The seasonal utility of natural energy varies to some extent, but it is possilbe to employ it eficiently throughout Japan. In this paper, I'd like to report the direct utility of the energy of solar heat.
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