UNDERGROUND HEAT EXCHANGE AIR-CONDITIONING SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide an underground heat exchange air-conditioning system capable of maintaining excellent heat exchange efficiency even when an external temperature is extremely low or high and a required air flow is large.SOLUTION: An underground heat exchange air-conditioning system performs heating and cooling of an indoor space H in a manner that introduces external air A into a heat exchange pipe 2 buried in the ground E and sends the air A with heat thereof exchanged with underground heat in the heat exchange pipe 2 to the indoor space H. The underground heat exchange air-conditioning system has: a blower 4 which is installed inside the heat exchange pipe 2 and introduces the air A thereinto through an introduction port 3; a discharge pipe 5 which is connected to the heat exchange pipe 2 and discharges the air A with the heat thereof exchanged toward the indoor space H; a reflux pipe 6 which connects one edge 22 which is a first branching section in the heat exchange pipe 2 and the other edge 21 which is a second branching section positioned at an upstream side of the one edge 22 in the heat exchange pipe 2 and sends the air A discharged from the heat exchange pipe 2 back to the same through the other edge 21; and an on-off valve 7 which is installed either inside the reflux pipe 6 or at a downstream side of the other edge 22 in the heat exchange pipe 2 and controls a volume of the air A which has passed through the heat exchange pipe 2 and to be sent back to the upstream side thereof.SELECTED DRAWING: Figure 1