湿工况下低气压对翅片管换热器换热特性的影响  

Influence of the Low Atmospheric Pressure on the Heat Exchange Characteristics of a Finned Tube Heat Exchanger

作　　者：刘旗[1] 柳建华 徐小进[3] 祁良奎 

机构地区：[1]上海理工大学能源与动力工程学院,上海200093 [2]上海市动力工程多相流动与传热重点实验室,上海200093 [3]中国船舶重工集团公司第七〇四研究所,上海200031

出　　处：《热能动力工程》2016年第11期7-13,共7页Journal of Engineering for Thermal Energy and Power

基　　金：上海市教育委员会重点学科资助项目(J50502);上海市科委建设项目(13DZ2260900)

摘　　要：在高空低气压环境下模拟舱内对开缝翅片管换热器在湿工况下的换热特性进行了实验研究，分析了不同环境压力对空气侧换热特性的影响，包括显热换热、潜热换热和努赛尔数的变化规律。实验结果表明，当干球温度和相对湿度不变时，湿工况下空气侧显热换热量、潜热换热量和空气侧传热系数均随着环境压力的降低而减小；而单位质量潜热换热量几乎不变．潜热换热所占比例略微增大。同一个环境压力下，入口空气的相对湿度对换热器的显热换热量影响不大，而对潜热换热量影响显著。当相对湿度分别为40％、60％和80％时，显热换热量差异小于5％；而潜热换热量当相对湿度为80％时，是相对湿度为40％时的5．9～6．8倍。In a high altitude low atmospheric pressure environment imitation chamber,tested were the heat exchange characteristics of a slotted type finned tube heat exchanger under the wet operating condition and analyzed was the influence of various ambient pressures on the heat exchange characteristics of the air side,including the law governing changes of the sensible heat exchange,latent heat exchange and Nu number. The test results show that when the dry bulb temperature and relative humidity are kept constant,the amount of sensible heat and latent heat exchanged at the air side under the wet operating condition as well as the heat transfer coefficient at the air side will all decrease with a decline of the ambient pressure,however,the amount of latent heat exchanged in unit mass will be kept almost unchanged and the proportion of the amount of latent heat exchanged will somewhat increase. At a same ambient pressure,the relative humidity of the air at the inlet will have no big influence on the amount of sensible heat exchanged in the heat exchanger but notable influence on the amount of latent heat exchanged. When the relative humidity is 40%,60% and 80% respectively,the difference among the amounts of sensible heat exchanged will be less than 5% and when the relative humidity is 80%,the amount of latent heat exchanged will be 5. 9 to6. 8 times higher than that when the relative humidity is 40%.

关 键 词：湿工况 低气压 相对湿度 潜热换热 

分 类 号：TK172[动力工程及工程热物理—热能工程]