Convective Heat Transfer Characteristics of Plate Heat Exchanger Used as Solution Cooler in LiNO3-NH3 Diffusion Absorption Refrigeration System
What presented here is about the experimental research on the heat transfer characteristics of a plate-type heat exchanger used as solution cooler in a new style diffusion absorption refrigerator (DAR) in which an adiabatic spray absorber is adopted. Based on the parameters of working fluids measured at stable operating conditions, calculation and analysis of the heat transfer characteristics of the plate-type solution cooler such as overall heat transfer coefficient k, heat exchanger efficiency ε and convective heat transfer coefficient α are carried out and presented. The results show that the k, ε and convective heat transfer coefficient of LiNO3-NH3 solution (αs) of the plate solution cooler are in the range of 536.1～ 1036.7 W/(m2·℃), 0.61～0.72 and 651.5～1551.7W/(m2·℃), respectively. Analysis shows that the heat transfer area of plate solution cooler can be only 11.1％～21.5％ of the traditional falling-film absorber. It also indicates that αs increases with increase of Reynolds number (Re) and linearly increases with decrease of logarithm mean temperature (Δtm) of the plate solution cooler. Analysis about heat transfer resistances shows that the efficiency of the plate solution cooler mainly depends on the heat transfer characteristics of LiNO3-NH3 solution side where the heat transfer resistance is up to 68.99％～80.42％ of the total heat transfer resistance of the plate solution cooler.
convective heat transfer adiabatic spray absorber plate heat exchanger LiNO3-NH3 diffusion absorption refrigeration
Handong Wang
School of M. & E., Shenzhen Polytechnic, Shenzhen, Guangdong Province, China, 518055
国际会议
4th International Symposium on Heat Transfer and Energy Conservation(第四届传热与节能国际研讨会 ISHTEC2012)
广州
英文
1-5
2012-01-06（万方平台首次上网日期，不代表论文的发表时间）