| Keywords |
Ceiling air conditioning system ; Computational fluid dynamics(CFD) ; Predicted mean vote(PMV) ; Supplyair temperature ; Supply air volume ; Supply air angle |
| Abstract |
The purpose of this study is to deduce the optimal operating plan for the classroom ceiling air conditioningsystem based on air supply variables at the time of cooling operation. To carry out this objective, measuring exper-iment and computational fluid dynamics (CFD) were performed with variables including supply air temperature, airsupply volume and air supply angle of a ceiling air conditioning system. Based on a comparison of the results,classroom temperature and velocity distribution are analyzed, so the air volume distribution can be improved accordingto the heat generating load of the occupants. Ultimately, through the evaluation and analysis of the occupants’ Pre-dicted Mean Vote (PMV), an optimal operating plan for the summer is proposed. Room temperature and velocitydistribution stayed in the most stable condition at the temperature setting of 26oC, air supply volume of 4320CMH,and air supply angle of 30o, With regard to the improvement plans based on the occupants' heat generating load, theair supply volume is reduced in the less populated front area, and raised in the more populated right and left sidesof the room. Among the proposed improvement plans [ALT-3] in which the air supply volume is reduced by 40%in the front area and 20% at the south and north, exhibited the least difference in room temperature. The occupants’PMV stayed in the comfortable zone ±1, and the occupants feel comfortable in the range of ±0.5 throughout theentire room. |