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The purpose of this study was to propose the new planning direction of the unit, according to know which kind of heat trasfer system is to make proper thermal environment. This study was carried through measuring the distribution of the interior temperature and the temperature of the side wall to find the characteristics of the thermal environment in using convection jointly with radiation cooling panel by numerical analysis which is carried out using Phoenics program. From the velocities and temperature of several models having variable numbers of air temperature and air velocity , these results are as follows;The drop in temperature is rapidly made until about 200 sec, after that is shown convergence through vibration. The temperature difference between the upper and lower parts of the room is high in the order of forced convection system>radiant jointly with convection system>radiant system.