Optimization of Air-Curtain Sealing Efficiency with Respect to Heat Transfer in Naturally-Ventilated Buildings

摘要

This study presents results of coupled 3D steady Reynolds-averaged Navier-Stokes (RANS) Computational Fluid Dynamics (CFD) simulations of an isolated naturally-ventilated building with the application of an air curtain to prevent heat transfer across a doorway.The considered parameters include air curtain velocity,width and angle,indoor and outdoor temperatures,and wind flow.The results showed that higher temperatures inside the studied building were provided for: (1) higher jet velocities Vac for a jet angle α = 15°,when jet width wjet is constant; (2) larger jet width wjet,when jet angle α and jet momentum Mac' are constant; (3) jet angle α = 0°,when jet velocity Vac and jet width wjet are constant.The results also showed that for an air curtain with α = 0° the air jet slightly bended to the outside that is possibly caused by stagnation-zone flow in front of the building.