부산대학교 도서관

A truck refrigeration system using phase change material (PCM) is expected to have a lower noise level, reduced energy cost and much lower local greenhouse gas emission. It is difficult to maintain the truck at low temperature by using a refrigeration system with natural convection in the PCM module without a supplementary system. Therefore, a forced convection type PCM heat exchanger has been developed recently. As the operation time increased, the PCM around the air inlet will melt first because a large temperature difference between the PCM and air. So the latent heat transfer area will decrease and the heat transfer rate of the module will decrease even though there are a lot of PCM which do not melt around the air outlet. There were only a few study which focused on the improvement of the transfer rate inhomogeneity to maximize the use of the thermal storage media. The computational fluid dynamic modeling of the PCM refrigeration module was validated by the experiment. Using the CFD, the design parameters, such as the mass flow rate of the air, gap width between slabs, the roughness height of slab, location of partition, were investigated to improve this transfer rate inhomogeneity. As a result, the adoption of partial roughness height on the slabs improved the heat transfer rate inhomogeneity.