| 摘要 |
<p>A heat pump (15) for heating a building (3) is connected to the volume of air in a duct system, more particularly the sewage system (1, 2). The earth around the duct system serves as heat source and heat accumulator while the air flowing through the duct system serves mainly as a heat transfer medium. Outside the heating season the earth accumulator is recharged by warm sewage and storm water without additional installations being required. <IMAGE></p> |
