- October 2010
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This paper presents the thermal and pressure-drop experimental evaluation of a fusion plate heat exchanger (PHE) during boiling conditions of a solution of lithium nitrate in ammonia. The data are
representative of the working conditions of generators in single-effect
absorption chillers. The solution flow rate and outlet temperature were
modified in the ranges of 0.041&-0.083 kg/s and 78&-95 °C, respectively.
Correlations for single-phase-flow heat transfer are used to
characterize the boiling heat transfer. The influences of the heat flux,
mass flux and exit-vapour quality are analyzed. Boiling heat-transfer
coefficients and correlations for the Nusselt number are obtained.
Results are compared with Cooper's and Ayub's correlations for boiling
heat transfer. Pressure drop in the solution side was also measured and
one correlation was obtained to characterize the frictional pressure
drop under boiling conditions.