If the ground-source heat pump are used in open systems, namely the use of direct extraction of groundwater and pumps refrigerant for heat exchange, and at suitable locations recharge or discharge.
如果地源热泵采用的是开路系统，即利用水泵直接抽取地下水与制冷剂进行热交换，并在合适地点回灌或排放。
2
VRF F system is a kind of direct evaporation refrigerant system.
多联机系统是一种直接蒸发式冷媒系统。
3
Various models are available, including those for industrial-grade environments and for direct immersion in water or refrigerant.