低温蒸发溴化锂吸收式污水源热泵系统研究

Research on Li-Br Sewage Source Heat Pump System with Low Evaporating Temperature

为解决溴化锂吸收式污水源热泵受溶液工质对自身特性的影响,无法在低位热源温度较低时持续运行的问题,在传统双效溴化锂吸收式热泵系统的基础上增设吸收-蒸发器,构成可低温蒸发的溴化锂吸收式污水源热泵系统。采用高低压发生器串联、吸收器与吸收-蒸发器并联的结构形式,分析系统热源适用条件,并对系统运行特性进行了研究。结果表明:相比于双效溴化锂吸收式热泵系统,该系统在设计工况下可降低蒸发温度20℃,提升冷凝温度10℃,且系统热力系数提高了76.78%。采用遗传算法对系统进行优化设计,得到最优单位供热量成本为0.165元/kW。系统可在较低蒸发温度条件下,满足供热要求和制热效能。

In order to solve the problem that the lithium bromide absorption type sewage source heat pump is not affected by the low heat source temperature when the temperature of the low heat source is low,the absorption-evaporator is added on the basis of the traditional double lithium bromide absorption heat pump system.One type with the generator in series and absorber in parallel is screened as the focus of this research.The conditions of the system heat source and the running characteristics of the system are studied.Compared with the traditional double-effect lithium bromide absorption heat pump system,the system can reduce the evaporation temperature by 20℃,raise the condensation temperature by 10℃,and improve the thermal coefficient of the system by 76.78%.Genetic algorithm is used to optimize the design of the system and the optimal unit heat supply cost is 0.165 yuan/kW.The system can meet the heating requirements and heating efficiency under the condition of low evaporation temperature.