NH_3-LiNO_3与NH_3-NaSCN在水平管内沸腾换热特性的试验对比分析  

Experimental comparison and analysis on boiling heat transfer characteristics of NH_3-LiNO_3 and NH_3-NaSCN in horizontal tube

作　　者：刘越[1] 梁翛 李柯桥 蔡德华[1] 何国庚[1] Liu Yue;Liang Xiao;Li Keqiao;Cai Dehua;He Guogeng(Huazhong University of Science and Technolog)

机构地区：[1]华中科技大学

出　　处：《制冷与空调》2018年第10期52-57,71,共7页Refrigeration and Air-Conditioning

基　　金：国家自然科学基金(51706077);深圳科技创新委员会资助(JCYJ20170307155844701)

摘　　要：通过试验对比分析氨盐工质对在水平管内的沸腾换热特性,分析热流密度、质量流量及出口干度对沸腾换热系数的影响。试验结果表明,热流密度对于氨盐在水平管内的沸腾换热系数有主要作用,核态沸腾机制占主导地位;在相同工况下,NH_3-NaSCN溶液的沸腾换热系数比NH_3-LiNO_3溶液的沸腾换热系数略大,主要原因是前者黏度相对较小。Jiang J.等拟合的NH_3-LiNO_3工质对在水平管内的沸腾换热系数的关联式能够准确预测NH_3-NaSCN的沸腾换热系数。试验结果对于氨盐溶液在余热废热驱动的吸收式空调中的应用有着积极的促进作用。The comparative analysis on the boiling heat transfer characteristics of am- monia-salt solution in horizontal tubes is conducted by experiment. The effects of heat flux, mass flow and outlet degree of dryness on the coefficient of boiling heat transfer are analyzed. The experimental results indicate that the heat flux has the most significant impact on the coefficient of boiling heat transfer for ammonia-salt solution in horizontal tubes, the nucleate boiling is the dominant factor. Besides, under the same condition, the coefficient of boiling heat transfer for NHa-NaSCN solution is relatively higher than that of NHa-LiNOa solution, due to the former has relatively lower viscosity. The predictive correlation of the coefficient of boiling heat transfer for NH3-LiNO3working pair in hori- zontal tube carried out by Jiang J. et al., can make a precise prediction of the coefficient of boiling heat transfer for NHa-NaSCN. The experimental results are beneficial to the application of ammonia-salt solution to the absorption air-conditioning driven by waste heat.

关 键 词：空调 吸收式 NH3-LiN03 NH3-NaSCN 沸腾换热 水平管 

分 类 号：TB64[一般工业技术—制冷工程]