Australasian Science: Australia's authority on science since 1938

Solar Breakthrough Drives Air-Con Efficiency

CSIRO has unveiled a solar-powered air-conditioning system to cool Australian commercial buildings, achieving greater energy efficiency. The system uses concentrating solar thermal technology to produce heat energy used to power the air conditioning system.

The system addresses the high energy consumption of large commercial spaces such as shopping centres and hotels due to their heating and cooling energy requirements – around 60 per cent of total energy use.

The closed-loop system uses two ‘desiccant’ wheels to remove moisture from the air, acting as a dehumidifier. A high-temperature wheel uses solar heat for regeneration while a low temperature wheel functions without any external heat to deliver greater efficiency on a commercial scale.

CSIRO Energy Director Peter Mayfield is extremely pleased with the early results.“CSIRO’s energy research is driving down costs of renewable technologies, accelerating the transition to a lower-emissions future," Dr Mayfield said. “We are pioneering new technologies and this project is a world-first demonstration of a desiccant air-conditioning system using roof mounted concentrating solar thermal collectors."

The roof space required for the solar air-conditioning technology can be 40 per cent less than a traditional single-stage desiccant system.

Solar heat-driven desiccant air conditioning systems can provide humidity controlled fresh air into the buildings and is expected to significantly reduce HVAC electricity usage for commercial buildings.

CSIRO will continue to assess and monitor the technology for the next 12 months to establish long-term commercial operations and further investment as part of CSIRO’s commitment to creating a low emissions future for Australia.