Heat transfer coefficients in two phase flow for the water/lithium bromidemixture used in solar absorption refrigeration systems

This paper describes the experimental results obtained from the heat transf er in saturated nucleate boiling for the water/lithium bromide mixture flow ing upward in a uniformly heated vertical tube, which is the generator of a solar absorption refrigeration system. The concentration range for the mix ture was from 48 to 56 wt.% Plots of local and average heat transfer coeffi cients are shown against solution concentration, heat flux and the temperat ure difference between the wall tube and the fluid. It was observed that th e average heat transfer coefficients increased for the mixture with an incr ease of the heat flux and with the decrease of the solution concentration a nd the temperature difference. The average heat transfer coefficients varie d from 1.0 to 4.0 kW/m(2) degreesC. (C) 2001 Elsevier Science B.V. All righ ts reserved.