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Renewable heat


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Contents

1 Leading renewable heat technologies

1.1 Solar heating

1.2 Geothermal heating

1.3 Heat Pump

1.4 Wood-pellet heating

1.5 Wood-stove heating

1.6 Renewable natural gas

2 Energy efficiency

2.1 Insulation

2.2 Underfloor heating

2.3 Waste-water heat recovery

3 See also

4 External links

5 References
Renewable heat is an application of renewable energy and it refers to the renewable generation of heat, rather than electrical power (e.g. replacing a fossil fuel boiler using concentrating solar thermal to feed radiators).
Many colder countries consume more energy for heating than electrical power. For example, in 2005 the United Kingdom consumed 354 TWh[1] of electric power, but had a heat requirement of 907 TWh, the majority of which (81%) was met using gas. The residential sector alone consumed a massive 550 TWh of energy for heating, mainly in the form of gas. Almost half of the final energy consumed in the UK (49%) was in the form of heat, of which 70% was used by households and in commercial and public buildings. Households used heat for mainly for space heating (69%) and heating water.
Renewable electric power is becoming cheap and convenient enough to place it, in many cases, within reach of the average consumer. By contrast, the market for renewable heat is mostly inaccessible to domestic consumers due to inconvenience of supply, and high capital costs. Heating accounts for a large proportion of energy consumption, however a universally accessible market is still in its early stages.
Leading renewable heat technologies
 Solar heating
Solar heating is a style of building construction which uses the energy of summer or winter sunshine to provide an economic supply of primary or supplementary heat to a structure. The heat can be used for both space heating and water heating (see solar hot water). Solar heating design is divided into two groups:
Passive solar heating relies on the design and structure of the house to collect heat. Passive solar building design must also consider the storage and distribution of heat, which may be accomplished passively, or use air ducting to draw heat actively to the foundation of the building for storage. One such design was measured lifting the temperature of a house to 24°C (74°F) on a partially sunny winter day (-7°C or 19°F), and it is claimed that the system provides passively for the bulk of the building's heating[3]. The 4,000-square-foot (370 m2) home cost $125 per square foot (or 370 m2 at $1,351/m2), similar to the cost of a traditional new home.

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