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Concept 9-star house unveiled

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Energy

9-star Mirvac house

Credit: Mirvac

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A concept for a new ultra-energy efficient house has been unveiled in Melbourne this week. A 9-star energy rated house named Harmony 9, designed by Australian company Mirvac, incorporates a multitude of smart internal and external features that generate energy for the house, reduce the need for cooling and heating, save water and decrease the embodied CO2 in the construction materials.

The construction and occupation of homes is responsible for about one-quarter of Australia's energy and greenhouse gas emissions, 14 per cent of its water use and 40 per cent of the country's solid waste. Recognising the emerging importance of sustainability to the housing market Mirvac designed Harmony 9 as a showcase house at the Waverley Park development in southeast Melbourne.

Mirvac Design Director, John Eckert, likened Harmony 9 to the idea of a concept car in the automotive industry. "Not everything we have learnt is suitable for implementation straight away, but our knowledge paves the way forward for the entire development industry".

Though the house is not yet complete, the design has already received 9.2 stars on the Nationwide House Energy rating Scheme. Other houses at the Waverley Park development are rated 6+ stars.

Low Energy Requirements

Energy requirements in the house are low due to a number of factors, starting with the orientation of the building. The house is positioned to take advantage of the sun in the winter, but features shading and adjustable louvers to restrict summer sun. The use of double glazed windows helps stabilise temperatures and they are located to provide optimum ventilation.

A large spine in the centre of the house is constructed of bluestone and brick. This large mass will soak up heat in the summer, but in winter nights it will dissipate the heat it gains from daytime sun.

The same principle is applied to the external walls. They are constructed with timber clad conventional stud frame on the outside, a layer of insulation in the middle and plastered bricks on the inside.

All of these concepts reduce the need for electricity-intensive cooling and heating systems, but the roofs are fitted with 30 m2 of photovoltaic panels to provide electricity for efficient appliances and low energy LED lights inside.

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