立式满液式蒸发器换热性能的试验研究  

Experimental Study on Heat Transfer Performance of Vertical-Flooded Evaporator

作　　者：宋嘉林 张吉礼 SONG Jia-lin;ZHANG Ji-li(Faculty of Infrastructure Engineering, Dalian University of Technolog)

机构地区：[1]大连理工大学建设工程学部

出　　处：《建筑热能通风空调》2017年第12期23-27,共5页Building Energy & Environment

基　　金：国家自然科学基金项目(No.51676026;No.51606029);大连市科技计划项目(2015E11SF055;2015E11SF053)

摘　　要：传统的污水换热器大多为卧式壳管式换热器,本研究考虑到污水换热器中污垢在管壁的沉积问题,设计了立式满液式蒸发器,搭建了立式满液式蒸发器型热泵机组,污水可以直接进入机组。本试验研究了在过渡流条件下,以R22为循环工质,在不同蒸发温度和管内流体雷诺数条件下,立式蒸发器换热性能的影响因素。结果表明,入口水温对蒸发器传热系数影响不大。冷凝温度一定条件下,蒸发温度越高,蒸发器传热系数越大,换热效果越好。提高管内流体雷诺数是提升换热器换热性能的有效措施,同时也是判断系统运行性能的一个重要参数。The traditional sewage heat exchanger is mainly designed as a horizontal shell and tube heat exchanger. Considering the deposition of dirt in the inner surface of the pipe of the sewage heat exchanger, the vertical-flooded evaporator was designed, and the heat pump units with vertical-flooded evaporator was built up, which the sewage water can be directly flowed into. Our test was under the condition of transition flow and based on the cycle fluid R22. The influencing factors on heat transfer performance of vertical-flooded evaporator under different evaporating temperature and Reynolds number was investigated. The results show that： the inlet temperature of the evaporator has little influence on the heat transfer coefficient of the evaporator; under the same condensing temperature, the higher the evaporating temperature, the greater the heat transfer coefficient of the evaporator, the better the heat transfer performance; increase the Reynolds number of inner fluid is an effective approach to improve the heat transfer performance, and Reynolds number of inner fluid is also an important parameter to evaluate the operating performance of the system.

关 键 词：立式满液式蒸发器 热泵系统 蒸发温度 雷诺数 

分 类 号：TU83[建筑科学—供热、供燃气、通风及空调工程]