| 摘要 |
PROBLEM TO BE SOLVED: To suppress deterioration in heat exchange efficiency by suppressing icing on a geothermal heat exchanger, in a heat pump wherein both of a heat source side heat exchanger and a geothermal utilization heat exchanger connected in series perform heating operation at a same time serving as an evaporator.SOLUTION: An air-conditioning system (1) includes: a refrigerant circuit (10); and a heat medium circuit (20) having a geothermal heat exchanger (21) buried in the ground and a geothermal utilization heat exchanger (25) connected to the geothermal heat exchanger (21) and the refrigerant circuit (10), wherein, while a utilization side heat exchanger (60) functions as a condenser, a heat source side heat exchanger (80) and the geothermal utilization heat exchanger (25) perform heating operation at a same time functioning as the evaporator. The geothermal utilization heat exchanger (25) is connected between the expansion mechanism (70) of the refrigerant circuit (10) and the heat source side heat exchanger (80), and a decompression mechanism (71) is provided between the heat source side heat exchanger (80) and the geothermal utilization heat exchanger (25). |
