The indoor unit in the heating room acts as condenser and the indoor unit in the coolingroom acts as evaporator while the outdoor unit may act as evaporator or condenser.
制热房间的室内机作为冷凝器，制冷房间的室内机作为蒸发器，而室外机可能是冷凝器也可能是蒸发器。
2
To solve the unstable operation of the water chiller unit, probes into the feasibility of fresh air cooling for a clean room and provides a design procedure verified with an example in Beijing.