| Summary: | 碩士 === 國立成功大學 === 建築學系專班 === 92 ===
In 2003, a viral respiratory illness- Severe acute respiratory syndrome (SARS) caused the global scare. The illness of SARS was thought to be transmitted most readily and broadly by the primary spread of close person-to-person contact and the movement. In addition, it is a possible incidence of airflow or by other ways. On the base of occupant-health, the study was mainly focused on improving the ventilation performance of a reconfigured room. The issues included indoor environment factors such as the airflow path, pollutants elimination and so on etc. The experimental field was a general single room that adopted the measurement via smoke generation and numerical simulation by CFD techniques. Proposed a standard procedure by compared the measured and simulated results. Air Change Rate was 12ACH referred to the proposed criterion of AIA (The American Institute of Architects), the outlet air was greater than the inlet air in a negative-pressure room, the static pressure (sp) difference between indoor and outdoor≧8Pa (closed to 0.032in-WG), and outlet air was 1.2 multiple of the inlet air that was referred to the proposed benchmark of The Centers for Disease Control (CDC). Our major findings were as below:
1.The Ventilation measurement of a Reconfigured General Single Room by the Push-Pull HVAC System: the indoor temperature was 24.7℃~26.2℃ was conformed to the benchmark, 22~28℃, of IEI; indoor relative humidity was 64.9% ~68.6%; indoor air velocity was 1.2 m/s~2.4 m/s, the average air velocity was 1.7 m/s, the inlet air wind-speed was 2.94 m/s~4.50 m/s at the lower part of the door, the average the inlet air wind-speed was 3.89 m/s; the average outlet air was 687.8 cfm by an air exhauster, the average the inlet air was 511.8 cfm. The average static pressure (sp) difference was -0.157 mm-Hg(closed to -20.92 Pa、-2.13 mm-Ag). The outlet air was 1.34 multiple of the inlet air that beyond the proposed benchmark of The Centers for Disease Control (CDC). Air Change Rate was 24.96ACH beyond the proposed criterion, 12ACH, of AIA, the static pressure (sp) difference between indoor and outdoor exceeded 8Pa.
2.Simulated results of airflow and thermal comfort approximated to the truth. From the airflow simulated result, it was obviously strong in the path of the outlet air and the inlet air. Besides beyond the 1-meter scope of the head zone, pollutants could be eliminated efficiently by the exhauster. From the thermal comfort simulated result, it was a high temperature nearby the head zone. Indoor temperature showed slight variations for changing the path of the airflow. It also showed eddy current from simulated results of the indoor airflow. Using CFD techniques could predict the indoor airflow, revise the reconfigured design, and avoid eddy current surrounding the head zone.
3.From the procedure, proposed a practical evaluation by the numerical simulation performed before the renovation on the ventilation performance of a general single room reconfigured by the push-pull HVAC system. A negative-pressure room should be assured of eliminated efficiently by the exhauster, and avoided to come back to the other zone.
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