| 수록사항 |
한국생활환경학회지 , v.9 n.4(2002-12) |
| 주제어 |
; Ceiling Supply Air Conditioning ; Computational Fluid Dynamics ; Velocity Distribution ; Temperature Distribution ; Predicted Mean Vote ; Alternatives ; Auditoriums |
| 요약1 |
This study focused on the ceiling supply air conditioning system installed in auditoriums with 1,000 seats or less and analyzed, by means of computer simulation, the temperature and velocity distribution together with the predicted mean vote (PMV) of the occupancy zone. The existing ceiling supply air conditioning system has a nozzle air inlet in the ceiling through which air is released. This airflow exceeded the allowable velocity in the occupancy zone 1 meter above the floor surface, causing a draft. The indoor temperature was 24.7oC when cooled, 1.3oC lower than the set air temperature (SAT), and 25.5oC when heated, 3.5oC higher than the set air temperature. The Predicted Mean Vote (PMV) of the ceiling supply air conditioning system in the rear seating area of the first floor where the ceiling is relatively low was -0.1~-0.61 when cooled and -0.2~-0.53 when heated. These figures are than those within the comfort zone, indicating the presence of some level of discomfort. As means of improving the ceiling supply air conditioning system, this thesis investigated three systems: the floor supply air ceiling suction system (ALT-1), floor supply air wall suction system (ALT-2), and floor central supply air wall suction system (ALT-3). The most promising data were extracted from the floor supply air wall suction system (ALT-2), known for its superior performance in the thermal environment, when the existing cooling and heating system capacity was reduced by 50%. showed that the velocity distribution in the occupancy zone was within the allowable limit 0.14~0.24 m/s when cooled and 0.1~0.28 m/s when heated. These levels in the occupancy zone lie within the comfort zone. |
