双效溴化锂吸收式热泵余热回收系统数值模拟研究

溴化锂吸收式热泵机组可以有效回收利用工业和建筑中的各种形式低温余热,提高余热资源回收率,但设备参数对热泵性能影响很大.因此本文基于温度对口和梯级利用的原则,对蒸汽型双效溴化锂吸收式热泵机组内传热部件进行热力及传热分析,通过质量和能量守恒建立热泵机组数学模型,分析热网供水温度、蒸发器进口低温余热水温度和驱动热源温度这三个...

Numerical Simulation Study on Waste Heat Recovery System of Double-effect LiBr Absorption Heat Pump

Lithium bromide absorption heat pump units can effectively recover and utilize various forms of low-temperature waste heat in industry and construction,and improve the recovery rate of waste heat resources,but the equipment parameter has a great impact on the performance of the heat pump.Therefore,in this paper,based on the resources of temperature matching and cascade utilization,thermal and heat transfer analysis are carried out on the heat transfer components in the steam double-effect lithium bromide absorption heat pump units and analyze the influence of three external factors on system performance,such as the hot net water supply temperature and evaporator imported low temperature residual hot water temperature and the temperature of driving heat source through the establishment of mathematical model for heat pump unit mass and energy conservation.The results show that the COP of the heat pump system is 2.67 when the water supply temperature is about 49℃.The COP of the heat pump system is 2.67 when the temperature of the evaporator inlet low-temperature residual hot water is about 47℃.The COP of the heat pump system is on the rise with the increase of the driving heat source temperature.It provides guidance for reasonably setting equipment parameters to improve heat pump performance in the actual operation of absorption heat pump.