Here solar radiation collection and storage are thermally isolated from the living spaces of the building. This results in a greater flexibility in the design and operation of the passive concept. The most common example of isolated gain is natural convective loop. In this system solar radiation is absorbed to heat air or water. The warm air or water rises and passes through the storage, transferring its heat. The cooler air falls to the absorber to get heated up again. Thus a 'thermosiphoning' heat flow occurs. The collector can be located at any suitable place and oriented independently of the building for maximum solar gain. Thus building design can be flexible. The slope of the collector is generally equal to the latitude of the place. Its area may range from 20% to 40% of the floor area of the living space to be heated. The collector consists of an absorber (usually a corrugated metal plate with black pint that can withstand temperature upto 120°C) and glazing. The method of distribution of heat from the storage can either be by radiation or convection, or it can be directly from the collector. If water is used as the working fluid, the hot water can be run through the pipes installed in the floor slab, where heat is stored and radiated into the living space.
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