The heat collector to collect the solar heat that can be used for cooling in the summertime, water to be accumulated in water, it can be roughly divided into air type to store in the air, water type is possible to retrofit to the existing facility, whereas the air type of building integrated is the advantage that can be used directly heating the air warmed.
In addition, heat storage tank and water storage tank for leveling the heat demand balance caused by the gap in the time zone of heat utilization and heat collection, heat exchanger, and performs a hot water and heating in combination such as a boiler, further heat can be chemically converted to air conditioning in the summertime. As a promising industry for nuclear power plants, the use of solar heat is affected by the rise in crude oil prices due to the second oil crisis in 1979. Although demand increased at that time, the subsided of oil prices continued to peak around 1980. The due of the great East Japan earthquake and the Fukushima nuclear power plant, the effective means of combating global warming, and attracting attention again as a promising industry.
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