Solar heating


Solar heating

Solar heating is the usage of solar energy to 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 solar heating uses pumps which move air or a liquid from the solar collector into the building or storage area.

* Passive solar heating 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).

History

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.

Other uses

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 convection from 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. White objects 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 sunscreen is a dye that perfectly absorbs, with high emissivity, or perfectly reflects, ultraviolet and infrared while 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.

Worldwide

Solar heating in Europe

ee also

*Solar panel
*Solar gain
*Solar Hot Carbon
*Solar combisystem
*Solar furnace
*Renewable energy
*Renewable heat
*Seasonal thermal store
*Timeline of solar cells
*Wood pellets‎

References

External links

* [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]


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • solar heating — Use of solar radiation to heat water or air in buildings. There are two types: passive and active. Passive heating relies on architectural design; the building s siting, orientation, layout, materials, and construction are utilized to maximize… …   Universalium

  • solar heating — noun : space heating by capture and conversion of radiant energy from the sun compare solar furnace * * * solar heating noun A method of providing hot water, esp for domestic heating systems, by collecting heat radiated by the sun in water passed …   Useful english dictionary

  • solar heating — heating water via the sun s rays, heating by solar power …   English contemporary dictionary

  • solar heating — /soʊlə ˈhitɪŋ/ (say sohluh heeting) noun the use of solar energy to provide heating for air or water in a building. –solar heated, adjective …   Australian English dictionary

  • Solar heating and hot water systems —   Solar heating or hot water systems provide two basic functions: (a) capturing the sun s radiant energy, converting it into heat energy, and storing this heat in insulated storage tank(s); and (b) delivering the stored energy as needed to either …   Energy terms

  • solar heating system — water boiler that uses the energy of the sun in order to heat the water …   English contemporary dictionary

  • Central solar heating — is the provision of central heating and hot water from solar energy by a system in which the water is heated centrally by arrays of solar thermal collectors (central solar heating plants CSHPs) and distributed through district heating pipe… …   Wikipedia

  • IEA Solar Heating & Cooling Implementing Agreement Task 13 — (Solar Low Energy Buildings) was an international effort organised by one of the International Energy Agency s Implementing Agreements to build several solar low energy houses. This took place between between 1989 and 1993(?). The Implementing… …   Wikipedia

  • Passive solar heating —   A solar heating system that uses no external mechanical power, such as pumps or blowers, to move the collected solar heat.   U.S. Dept. of Energy, Energy Information Administration s Energy Glossary …   Energy terms

  • Liquid-Based Solar Heating System —   A solar heating system that uses a liquid as the heat transfer fluid …   Energy terms


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.