Research on the Heat Transfer Rules of Natural Convection in a Building with Single Heat Source

Taking buildings' cooling problem as the background, the natural convection were numerically simulated in a cavity with single heat source using SIMPLE algorithm with a QUICK scheme. The temperature field, flow field and rules of heat transfer were studied. The results showed that two symmetrical vortex appeared in a single heat source with the different ratio of length and height. With the increase of the ratio, vortex's number unchanged, and shape became wide. The influence of the heat source on around became weak with the increase of the aspect ratios. After considering the radiation on the building walls, the distribution of each section temperature changed. When the ratio of length and height became smaller, the distribution changed obviously. On the contrary, it had a little change. The ratio of radiation to convection basically was stable at 0.42, radiation had a greater impact to heat transfer.