The effect of longitudinal vortex generation on heat transfer is evaluated for a full scale plain fin-and-tubecompact heat exchanger operating in both dry and wet conditions. The heat exchanger tested is comparable to anevaporator in a residential air-conditioning system. For this study the baseline performance of the heat exchanger isdetermined then the heat exchanger is modified with the addition of 2100 delta-wing vortex generators.The performance is determined by a volume goodness factor for the dry operating conditions and theoverall enthalpy transfer coefficient for wet operating conditions. A 10% improvement in the volume goodnessfactor was recorded for the dry tests and the wet tests showed an overall reduction in the overall enthalpy transfercoefficient. A comparison was then made using j and f correlations for other enhanced surfaces. From these tests thej/f value for the vortex generator enhanced surface is shown to be comparable to the other enhanced surfaces.
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