采用喷水螺杆式水蒸气压缩机的高温热泵设计及性能分析

针对高温热泵的工业需求,设计并分析以水为介质的闭式高温热泵系统,系统引入喷水螺杆式水蒸气压缩机,利用喷水实现压缩机排气为饱和状态,满足工业应用高温升(高压比)的技术要求的同时,克服高排气温度会导致的机械及安全问题。计算结果表明:系统在蒸发温度为90℃,冷凝温度为100℃时,COP高达31.48,压缩机喷水注入比为0.019;蒸发温度为75℃,冷凝温度为100℃工况下,系统COP为5.99,对应的压缩机压比为7,注入比为0.103;压缩机比功率随压缩机压比升高而增加,增加幅度随蒸发温度的升高而增大;系统COP随注入水温度的升高而降低,但变化趋势并不大。

Design and performance analysis of high temperature heat pump using water-jet screw type steam compressor

The close-loop high temperature heat pump system using water as its refrig- erant is designed and analyzed due to demands of high temperature heat pump in the indus- trial area. The heat pump uses a water-jet screw type steam compressor. The water spray makes the discharge steam reach a saturation point. It meets the requirements of high tem- perature rise （high pressure ratio）,also avoids the mechanical and safety issues caused by high discharge temperature,the calculation results show that： COP can reach 31.48 at the condition of 90℃ evaporating temperature and 100 ℃ condensing temperatur, the compressor water injection ratio is 0. 019. When the evaporating temperature goes down to 75 ℃ ,COP decreased to 5.99, the compression ratio of the compressor is 7 and the water injection ratio is 0. 103. The compressor specific power increases when pressure ratio increases. The increase rate is higher when evaporating temperature is higher. COP decrea- ses slightly when the injected water temperature increases.