Phase change material(PCM) is applied actively to a supplementary heat source/sink in building HVAC and others.In order to show that thermal interference of adjoining two PCMs which made two rooms. Two PCMs, the high temperature PCM(HPCM, M.P: 78~79°C) and low temperature PCM(LPCM, M.P.:28~29°C) were utilized to the thermal energy storage material. PCMs were charged in two rooms of module, respectively. The arrangement of the cell was selected to BRINE-HTPCM-LTPCM order which was found to the worst heat transfer rate during melting/solidification from previous study. In this study, we predicted the heat transfer rate of HTP to that of HTP with perforated fin(FHTP) using CFD. We compared using CFD results and experimental results. At results, melting/solidification time of CFD results is long compared to the experimental results. But results of FHTP was shorter than results of HTP.