Effects of surface enhancement, film-feed supply rate, and bundle geometry on spray evaporation heat transfer performance
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Testing was conducted with R-134a through an overfeed ratio range of 1.4 to 7.9 to evaluate the effects of Reynolds number on shell-side heat transfer performance in the spray evaporation environment. Data were taken with a fixed refrigerant supply rate. Both triangular and square-pitch tube bundles were tested to determine the effects of bundle geometry on heat transfer performance. Two enhanced condensation surfaces were used. Heat transfer performance was found to be dependent on film-feed supply rate to varying degrees, depending on the type of surface enhancement. The surfaces that limited axial flow of the liquid film yielded poor heat transfer performance in lower rows of the bundle. The spray evaporation heat transfer performance for one of the enhanced condensation surfaces was better than the flooded evaporator performance for the enhanced boiling surface.
author list (cited authors)
Moeykens, S. A., Newton, B. J., & Pate, M. B.