PLANT FOR TEMPERING OF A BUILDING
The invention relates to a plant for tempering of a building and comprising an energy storage in ground formed by ground heat exchangers (GHEX) coupled in parallel and each provided with a heat insulated leg (20) and a non-insulated leg (24) in good thermal contact with surrounding soil. The heat exchangers are included in a circulating circuit for a circulation fluid, which circuit includes a circulation pump (65) and room temperature keeping devices (RTKD). The energy storage has, according to the invention, together with its ground heat exchangers (GHEX) been imparted in the depth direction a continuously varying temperature from a cold end to a warm end. The flow direction in the ground heat exchangers is controlled by a reversing valve (76) such, that a warm keeping function the circulation fluid is received from the warm end and at cool keeping function the circulation fluid is received from the cold end. The circulation pump is controlled such, that the circulation flow brings about a temperature difference between the inlet and outlet (60, 63) of the ground heat exchangers (GHEX) that is always is constant with a value that can be calculated with the aid of the properties of the ground and the actual components.