水源热泵应用低温地热的节能效果分析

ANALYSIS ON THE ENERGY SAVING EFFECT OF WATER LOOP HEAT PUMP SYSTEMS WITH LOW TEMPERATURE GEOTHERMAL

水源热泵（ＷＬＨＰ）是商业、公用建筑供暖空调的一种有效装置．ＷＬＨＰ系统通过热回收和热平衡取得节能效果．ＷＬＨＰ系统的水源温度一般控制在１６℃～３２℃之间．空调工况下，热泵的排热通过冷却塔散热控制水源温度不超过３２℃．供暖工况时，热泵的吸热通过加热器加热控制水源温度不低于１６℃．同时供冷供暖是ＷＬＨＰ系统独特的运行模式．本文着重分析这种运行模式的热力学性能和节能效果，并对低温地热用作ＷＬＨＰ系统水源热输入的节能效果进行分析．

Water loop heat pump (WLHP)systems are an important option for space conditioning in commercial buildings. They provide the opportunity of saving energy through heat recovery and thermal balance when heating and cooling occur simultaneously. WLHP systems typically operate at a loop water temperature between 16℃ and 32℃. When cooling loads dominate, loop water temperatures are maintained below 32℃ by rejecting excess heat with a cooling tower. When heating dominates, loop water temperatures are maintined above 16℃ by a heater input. The emphasis of this paper is on the analysis of system performances, energy saving of the mixed cooling and heating mode of the WLHP systems for it is a unique operating mode in the air conditioning and space heating systems. The energy saving effect by using low temperature geothermal as the heat input for WLHP systems was examined.