- Solar heating
Solar heating is the usage of
solar energyto provide process, space or water heating. See also Solar thermal energy. The heating of water is covered in solar hot water. Solar heating design is divided into two groups:
Active solarheating uses pumps which move air or a liquidfrom the solar collectorinto the building or storage area.
Passive solarheating does not require electrical or mechanical equipment, and may rely on the design and structure of the house to collect, store and distribute heat throughout the building ( passive solar building design).
The very first solar heating factory in the world was built by Jewish immigrants, from South Africa, in Ashqelon Israel in 1952. In 1980 a law was passed in Israel making solar heating mandatory.
How solar heating works
A typical household solar heating system consists of a solar panel (or solar collector) with a heat transfer fluid flowing through it to transport the heat energy collected to somewhere useful, usually a hot water tank or household radiators. The solar panel is located somewhere with good light levels throughout the day, often on the roof of the building. A pump pushes the heat transfer liquid (often just treated water) through the panel. The heat is thus taken from the panel and transferred to a storage container.
Solar heating also refers to the heating of any objects, including buildings, cars, through
solar radiation. Solar heating depends on the solar radiation, surface area, surface reflectance, surface emissivity, ambient temperature, and thermal convectionfrom wind. With objects on Earth, solar heating reaches a state of temperature equilibrium as the heat imparted by the sun is offset by the heat given off through reflection, radiation, and convection. Whiteobjects stay dramatically cooler than other objects because the most important variables are characteristics of the surface, reflectance, emissivity, convection and surface area. Silvery objects get hot even though they are excellent reflectors because they are very poor in heat emission. Human skin, and many other living surfaces, like tree leaves, have near perfect emissivity (~1.0), and so stay pretty cool. A perfect sunscreenis a dyethat perfectly absorbs, with high emissivity, or perfectly reflects, ultravioletand infraredwhile being transparent in visible light.
It is worth noting that it is impossible for any material to be a good absorber of a given frequency and at the same time a poor emitter of the same frequency ( or the other way around). The difference in absorption and emission arises because the radiation emitted by a relatively cold object like a human, has much lower frequency than the radiation emitted by a hot object like the sun. Materials which have high emissivity for low frequencies but high absorption at higher frequencies will therefore stay much cooler than materials which have high absorption of high frequencies and low emission of low frequencies.
Solar heating in Europe
Solar Hot Carbon
Seasonal thermal store
Timeline of solar cells
* [http://www.spf.ch SPF - Institute für Solartechnik - Testing and research competence in Solarthermie]
* [http://www.polysun.ch Polysun - Software to design and simulate solar thermal systems]
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