纯工质及混合工质管外沸腾换热特性研究  

Characteristic Investigation of Boiling Heat Transfer of Pure and mixed Refrigerants Over Horizontal Tubes

作　　者：贾明丹 徐静珂 朱春洁[1] 刘磊[1] 张定才[1] JIA mingdan;XU Jingke;ZH UChunjie;LIU Lei;ZHANG Dingcai(School of Energy and Environment, Zhongyuan University of Technology, Zhengzhou 450007, China)

机构地区：[1]中原工学院,郑州450007

出　　处：《制冷》2017年第1期14-19,共6页Refrigeration

基　　金：河南省高等学校供热空调重点学科开放实验室研究基金(2015HAC203);河南省教育厅科技攻关计划项目(13B480297)

摘　　要：对水平管外纯工质R22、R134a,R125浓度分别为6%,12%,18%的R134a/R125混合工质以及三元混合工质R417A(R134a/R125/R600浓度分别为50%/46.6%/3.4%)池沸腾换热性能进行了试验研究。通过对不同工质在光管和强化管外的沸腾换热性能进行比较与分析表明:强化管外沸腾换热系数明显高于光管,在热流密度为60k W/m2时,纯工质R22在强化管外沸腾换热系数是光管的3.10倍;纯工质R134a在强化管外沸腾换热系数是光管的2.85倍;在分别含6%、12%、18%R125的R134a/R125混合工质中,强化管外的沸腾传热系数是相对于同条件下光管的2.49、2.42、2.28倍;在R417A中,强化管外沸腾换热系数是光管的2.10倍。不同质量浓度的R125对光管沸腾换热系数影响相对较小,而对强化管外沸腾换热系数影响较大。Pool boiling heat transfer of pure R22and R134a,the concentration ratio of R125are6%,12%and18%of R134a/R125mixed refrigerant,a ternary mixture R417A(R134a/R125/R600,the concentration ratio of50%/466%/34%)outside the horizontal tubes were investigated experimentally It was found that the boiling heat transfer coefficients of enhanced tube obviously higher than those of smooth tube by comparison and analysis While the heat flux of60kW/m2,in pure R22,the boiling heat transfer coefficient of enhanced tube is310times of the smooth tube;In pure R134a,the boiling heat transfer coefficient of enhanced tube is285times of the smooth tube The concentration ratio of R125are6%,12%and18%of R134a/R125mixed refrigerant,the boiling heat transfer coefficients of enhanced tube are249,242,228times as that of smooth tube,respectively;In R417A,boiling heat transfer coefficient of enhanced tube is210times of the smooth tube Different mass concentration of R125boiling heat transfer coefficient of smooth tube affect is relatively small,while the influence is higher on the boiling heat transfer of the enhanced tubes

关 键 词：纯工质 混合工质 池沸腾 

分 类 号：TB612[一般工业技术—制冷工程]