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Thursday, 29 July 2010
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renewable energy technologies

We strongly believe in the merits of 'green' energy. It is always worth considering whether your new home would benefit from one of the excellent new technologies available. SIP houses, with their inherent high insulation values, can be made even more energy efficient with the inclusion of an appropriate system. But bear in mind that good insulation is always the key, and that is the first element that we have addressed in both our SIP and timber frame kits.


Exhaust Air Heat Pump
An exhaust air heat pump works by utilising ducting to draw the warm moist air from areas such as kitchens and bathrooms back to the pump. The pump then uses a compression process to use the collected heat to warm up the water in the hot water tank (also part of the system). This hot water is then pumped around underfloor heating or radiators to provide domestic heating. This same tank also supplies the domestic hot water. An electric immerser kicks in automatically when there is not enough collected heat in the system. This system also has the advantage of controlling humidity - vital in a SIP house. The cold air is vented to outside and the moisture drains away via a pipe fed throught to outside. This system works best in a tightly sealed, highly insulated house.

Ground Source Heat Pump
A GSHP pumps the latent heat stored in the ground into a building to provide space and water heating. There are 3 elements to the system: a Ground Loop buried either in a borehole or in trenches, a heat pump and a distribution system, usually in the form of an underfloor heating system. It can cost in the region of £10,000 for the ground loop and heat pump, and £5,000 for the distribution system.

Solar Water Heating
solar panelsSolar panels can provide the bulk of your hot water needs in summer and around half in winter. The system can only be installed on a south-east to south-west facing roof. The system can cost around £4,000 to install.
Small Scale Wind or Water Turbine
Knowledge of the local wind resource and a suitably high site are requirements for the design of a domestic turbine. It is likely that a diesel generator and a bank of batteries will be required. Hydro power requires the source to be relatively close to the house. Costs are site specific and often high but there is a prospect of being able to sell energy back to the Grid. Maintenance costs should be considered.

Biomass
Extraflame wood-pellet stoveThere are two main methods of using Biomass to heat a house. A stand-alone stove provides space heating for a room and can be fueled by logs or pellets. It can be fitted with back boilers to provide water heating. Boilers connected to central heating systems use pellets, logs or chips. The log boilers require substantial storage facilities and manual loading. The chip-fed stoves require a local supplier of chips, and space and access for a hopper. Planning permission may be required.


It's worth remembering that grants may be available to you for installation of these types of system, through bodies such as the Scottish Community and Householder Renewables Initiative (SCHRI).

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