RP-1089 -- Flooded Evaporation Heat Transfer Performance Investigation for Tube Bundles Including The Effects of Oil Using R-410A and R-507A PDF

Correlation for the prediction of flooded evaporation tube bundle performance exists, but currently does not allow for the effects of miscible oils to be taken into account. For water chillers designed with positive displacement compressors, if oil separation is not 100% efficient, the influence of oil upon heat transfer performance and unit efficiency is typically significant. Until state-of-the-art compressor technology offering "oil-free" bearings is available in the market, heat transfer research must continue with the characterization of these oil effects.

The objective of this research project is to review the state-of-the-art of bundle boiling experimental work and prediction methods, perform smooth tube and enhanced tube tests as single-tubes and as tube bundles with/without oil, develop single-tube and bundle boiling models and prediction methods for general use including oil effects and develop two-phase pressure drop prediction method with oil effects. The test fluids are R-22, R-410A and R-507A with and without oil.