30 April 2010
Installations of ground-source heat pumps are increasing world-wide. Small systems for both heating and cooling are state of the art. Large ground-source systems for commercial buildings using the ground as a heat store, which is charged by heat abstracted from the building when in cooling mode, and discharged when heat is needed for heating mode, are presently the systems with the highest efficiency. Hygienic conditions, thermal comfort and low operating costs are the result of sophisticated design of such systems, which can also contribute to reducing the effects of climate change.