Abstract
In the method of horizontal air supply at the bottom of fancoil unit (HASB) in air conditioning system, as far as the occurrence of the short circuit phenomena and draft can be avoided by devising of air supply conditions, the supply air temperature can be lowered and thermal energy can be saved at the same thermal environment, compared with the method of vertical air supply at the top of fancoil unit (VAST). In this paper, under the thermal environment criteria of average temperature of 20℃ and average PMV of 0 (neutral) in an occupied zone, the steady state numerical calculation of HASB was conducted for a model room equivalent to that used in the past experiment. The optimum air supply conditions were discussed based upon the results of environmental factors such as heat loss through wall, supply air temperature, suction air temperature and temperature factor. As results, in some cases of the suitable combination of air flow rate and width of air outlet, the optimum scope where the supply air temperature and heat loss through wall can be minimized, was found. Furthermore, it was shown that the environmental factors except supply air temperature could be arranged by Archimedes number roughly.
