Saving the planet at home
by Geraldine Hinter
With
escalating energy costs and the increased impact of climate change,
there is a strong feeling within the community about the need for people
to actively contribute to a sustainable environment, starting in their
own homes. But many aren't sure how to go about it.
Director of UniSA's Institute for Sustainable Systems Technology Professor Wasim Saman says people have a strong and growing desire to actively contribute to a sustainable future and he believes they can.
"We're want to share our knowledge about the technologies available now that can reduce energy use and help to save the environment," he said.
"People can make deep cuts to their energy bills and, if they are willing to go the extra mile, they can develop a zero energy home.
"In a typical Adelaide home, about a third of energy consumption goes on heating and cooling, a third on hot water and the rest powers lights, refrigerators and other appliances," Prof Saman explained.
"By switching to a solar hot water system real energy savings can be made. The extra up-front costs can be recouped within two to three years, when compared with conventional systems, and many years of almost free hot water will follow."
Professor Saman said the simple move of replacing six incandescent light bulbs with compact fluorescent lights would save $360 a year. More savings can be made by choosing high star-rated fridges, washing machines and other appliances.
Evaporative cooling reduces electricity costs by 70 to 80 per cent. Six-star reverse cycle air conditioners can reduce heating and cooling costs by more than 40 per cent, when compared with two star models. Yes, they are more expensive, but Prof Saman estimates that they save around $350 a year in an average home. And for heating, UniSA has developed a roof integrated solar heating system that will cut costs by half.
For those building a new home, key factors such as the correct orientation of the home, good insulation, and double glazed windows are critical for ongoing energy savings. Double glazing will cut heating and cooling needs by a quarter.
"By implementing all of the suggested changes people living in established homes can save about 60 per cent on energy bills and also have the real satisfaction of helping the environment. It is also possible to take it a step further to full energy self sufficiency. Our research shows that after making the suggested changes, installing 3-4kW peak solar panels would be sufficient to have a net zero energy home."