| Heat and cold generation |  |
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Solar energy |  |
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| One of the strategies
used to minimize energy needed for space heat is the use of passive and
active solar gains. The solar contribution of active solar hot-water heating
systems for the domestic hot water is better than that of active solar
space-heating systems. Because the demand for hot water occurs over the
whole year, so that the long sunshine hours in the summer can be put to
full use.
The two most common heat transfer fluids are water (when necessary with antifreeze mixtures) and air. The basic components are the collector, storage unit, and load (i.e., the house or building to be heated). The design problem is in part the determination of an optimum combination of solar energy and auxiliary (i.e., conventional energy). Hot-water heating is a mature technology, and in most countries an industry exists that manufacturers and installs reliable, proven systems. |
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