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Green Smart Magazine : 2009_new
Hydronic heating, geothermal heat pumps and using the Earth's free heat sink are just some of the ways we can heat and cool our homes naturally. well designed home that incorporates passive design principles can reduce the need for artificial heating or cooling. This includes maximising the movement of cool air and excluding entry of summer sun. In winter, a building should trap and store heat derived from the sun and minimise heat loss to the external environment. The house should be orientated on the site with living areas in the range 15oW--20oE of true or 'solar' north to maximise the advantages of passive design. What is passive solar heating? Designing for passive solar heating is about taking advantage of natural heat sources to heat the home. This can be achieved by: • orientating daytime living areas and appropriate sized glazing and treatment to the north • positioning thermal mass (internal concrete and brickwork) where it is exposed to direct solar radiation to store heat • insulating walls, floors and ceilings and sealing draughts • zoning the house based on heating needs, i.e. positioning living areas and the kitchen towards the north; bedrooms along the east or south façade; and ensuring utility and service areas (e.g. bathrooms and garages) are not located on the northern façade or where they can block cooling breezes. A • transfer of preheated air to areas where heat is required • low running costs and quiet systems for air movement • can be used on single- and multi-storey houses • filtration elements can be added to filter airborne particles prior to redistribution • can be combined with externally mounted solar chambers to further increase efficiency of heat creation • easy to install during the construction stage, but can also be retrofitted • air can be transferred between heated and unheated rooms through ducting • due to low energy demand, power for these systems could be sourced from green power, solar panels or mini-turbines • savings of more than 60 per cent total household energy usage have been recorded using such systems. benefits of heat recovery + heat shifter systems solar + sink heating+cooling using heaven and earth for heating and cooling story > Janine Nechwatal 72 greensmart 9 ABOVE: Well-positioned thermal mass will reduce the need for artificial heating and cooling throughout the home Photo courtesy Adam Sebastian West