Abstract
In the previous paper, three types of cooling systems are examined, i.e. panel cooling only, cooling air supply only and combination of cooling air and cooling panel. The combination of cooling jet and cooling panel is proved to be the most promising system from the view point of reducing down draft and minimizing the effect of large heat load from the window. In this paper, the authors experimentally examine the influences of the following parameters on the air and thermal environment of a room model which is air-conditioned by the combination of cooling jet and cooling panel; (1) position and capacity of cooling panel, (2) supplying and exhausting conditions. The result of model experiment shows that floor cooling panel system causes strong vertical temperature distribution, and uneven radiative environment comparing the cooling panel on ceiling system. Reducing the temperature difference between the exhaust and supply air and decreasing the cooling panel surface temperature is effective for reducing the down draft risk in an occupied zone. In this case temperature distribution in the room become more uniform and the supply jet does not descend and mixed with the warm air from the window. The position of exhaust inlet have an important effect upon occupied zone temperature. When the exhaust opening is set above the window, the upstream heated by the wind is directly exhausted without diffusion and thus the heat load from the window has small influence on the thermal environment of the room.
