In Australia the need for cooling in buildings is high due to the climate we experience. This is traditionally dealt with via air cooled heat rejection as part of a heating, ventilation and air conditioning system (HVAC).
A geothermal air conditioning system operates the same as a conventional air conditioning system with the heat rejection being the only difference. The installation is no different to a conventional air conditioning system. In a Geothermal system the Earth is used to reject heat, drilling into the ground around 100m (closed loop).
Air conditioning performance is measured as a Co-efficient of Performance (COP). COP refers to the amount of cooling or heating in kWhr that is produced from each kilowatt of electricity that is consumed. Conventional systems have a COP of approximately 3-4 meaning that for every kW of electricity consumed, there is 3-4kW of cooling or heating produced. A geothermal system has a COP of around 6-7 (6 – 7 kW of heating or cooling is produced). The performance of a conventional system will reduce significantly the hotter or colder the ambient air temperature becomes as transfer of heat reduces. This makes the efficiency gain for a geothermal system even greater.
At Elecseed we have experience in the design of HVAC Geothermal systems using mainstream manufacturers such as Daikin, with several projects delivered via our staff.