Sourceable: Ivano Piubellini: Sep 2015
Using the stable temperature of the ground beneath our feet as a means to absorb heat or provide heat has been successfully applied for many years in Europe and North America. Geo-exchange systems often use water pumped through buried piping to achieve this heat transfer. It is often more efficient air conditioners which transfer heat with the atmosphere.
Ground temperatures in Melbourne have been measured at around 15 degrees Celsius a few metres below the surface.
. When cooling, a system transferring heat from a building into the ground at 15 degree is more efficient than transferring heat into the air on a hot day when air temperature is 30 or 40 degree Celsius.
. Similarly, when heating, a system drawing heat into a building from the ground at 15 degree Celsius is more efficient than drawing heat from the air on a cold night when air temperature is five or 10 degree Celsius
Whilst geo-exchange systems are gaining popularity in Australia, they are still relatively unknown in the industry. Part of this is due to additional expertise required to install these types of systems, including bore drilling expertise. The systems also need additional consideration regarding suitability as they will not be appropriate for all buildings and applications.
sourceable dot net / is-geo-exchange-more-viable-than-air-based-air-conditioning (broken link: may 2018)