Spray evaporation heat transfer performance of R-123 in tube bundles

The heat transfer performance of refrigerant R-123 in the spray evaporation environment was evaluated for pure refrigerant and for the case of lubricant addition. Tests were conducted with triangular-pitch tube bundles made from enhanced boiling tubes, enhanced condensation tubes, and plain-surface tubes. A second enhanced boiling surface tube bundle was also tested so a comparison could be made between the square- and triangular-pitch geometries. It was found that the heat transfer coefficients were dependent on the film-feed supply rate, oil concentration, and heat flux. The enhanced boiling surface yielded higher heat transfer coefficients than the enhanced condensation surface or the plain surface.

Spray evaporation heat transfer performance of R-123 in tube bundles Academic Article