Nucleate pool boiling heat transfer coefficient for methanol-salt mixture (LiBr.ZnBr2) solutions: Experimental studies

Abstract

This communication presents an experimental investigation on nucleate pool boiling heat transfer for methanol-LiBr.ZnBr 2 mixtures to be used in an absorption refrigeration system. An experimental rig consisting of an insulated cylinder vessel with a horizontal test section, a condenser, a water chilling unit and a single U-tube manometer was used and measurements on various heat fluxes, temperatures, and system pressures were made for a selected range of salt concentrations in the methanol-LiBr.Zn.Br 2 mixture. The heat transfer coefficient for the boiling of pure methanol and methanol-LiBr.Zn.Br 2 mixture was then obtained and presented in a graphical form and then correlated in an empirical form. It was found that the data on the heat transfer coefficient for pure methanol are in agreement with the data obtained by earlier authors, which supports the validity of experimental results presented here. The addition of LiBr.ZnBr 2 to methanol causes a considerable loss in heat transfer capability of the pure methanol.