自复叠热泵冷凝器设计

Condenser Design of Auto-cascade Heat Pump

与传统单级压缩式热泵相比较,非共沸混合工质自复叠热泵具有工作温差大的优点,可以扩大单级热泵的工作温度范围,适合于中国北方比较寒冷地区以及需要高温热泵的情况。以自复叠热泵系统用套管式冷凝器为研究对象,重点研究其冷凝过程特性和结构尺寸。分析了混合制冷工质泡点温度和露点温度以及气液相平衡关系,计算了套管式冷凝器的冷凝负荷。根据混合工质和冷却水的换热系数,对套管式冷凝器进行了结构尺寸确定。

Compared with the traditional single stage compressive heat pump,non-azeotropic mixture auto-cascade heat pump has the advantage of large temperature difference.It can expand temperature range of single-stage heat pump.Auto-cascade heat pump is suitable for China's northern cold areas and the case of high temperature heat pump.The condensation process characteristics and structure size of the double-pipe condenser with auto-cascade heat pump system were studied.The mixed refrigerant bubble point temperature,dew point temperature and vapor-liquid phase equilibrium relationship were analyzed.The condensing loads of condenser were calculated.According to the heat transfer coefficient of mixed refrigerant and cooling water,the structure size of double-pipe condenser was determined.