摘要
蒸发器和冷凝器的传热性能是影响制冷机组和双工质发电机组做功效率的关键因素,为了提高中低温余热在热泵机组和地热双工质发电系统中的利用效率,本文选用R245fa循环工质,对满液式蒸发器和冷凝器进行实验研究,分别讨论热水温度进口温度对蒸发器和冷凝器的传热系数、蒸发压力和冷凝压力的影响。研究结果表明,在工质流量和冷却水流量保持不变的条件下,蒸发器传热系数随着热水进口温度和温差的增大而减小,冷凝器的传热系数随着热水进口温度的增加先增大后减小,蒸发器传热系数可以达到2500 W/(m2·℃);蒸发器压力和汽轮机前后的压差随着热水出口温度的增加而增加,热水流量对蒸发压力和冷凝压力的变化浮动较小。
The heat transfer performance of evaporator and condenser is the key factor which has an effect on the power efficiency in the refrigeration and power generation units. An experimental investigation of evaporator and condenser heat transfer with different inlet and outlet hot water temperature was conducted. The cycle working fluid was R245fa. The experiment showed that the evaporator heat transfer coefficient decreased and condenser heat transfer coefficient increased first and then decreased with increasing inlet hot water temperature. The higher heat water temperature, the higher evaporation pressure; and the evaporator heat transfer coefficient can reach to 2500 W/（ m^2 ·℃）.
出处
《制冷学报》
CAS
CSCD
北大核心
2014年第3期21-25,共5页
Journal of Refrigeration
基金
国家高技术研究发展计划(863计划
2012AA053003)资助项目~~
关键词
R245FA
蒸发器
冷凝器
传热性能
中低温余热
余热利用
R245 fa
evaporator
condenser
heat transfer performance
mid-low temperature resource
waste heat utilization
