Presents the computational determination of the air diffusion performance index (ADPI) of a cold air jet in an enclosure. The jet outlet size, temperature, momentum, and Archimedes number were varied to produce a range of attached and separated flow regimes. The cooling load was produced by heating one of the room walls. The effect of using conventional and cold supply jets was investigated for two heat source locations. The results indicate that, for the type of diffuser and room configuration studied, an optimum ADPI was obtained when the jet separation distance is approximately equal to the room characteristic length. Room air flow conditions produced by conventional and cold air supply temperature air are almost identical to each other when the same separation distance criteria, i.e., same momentum flux, are used.

KEYWORDS: year 1996, cold, air jets, air diffusion, performance, computers, size, temperature, Archimedes numbers, rooms, walls, air flow