| Autor: |
SungMing Hung, KwokKeung Chong, ShangHao Liu, ChungHwei Su, LiPeng Chen |
| Jazyk: |
angličtina |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
Case Studies in Thermal Engineering, Vol 26, Iss , Pp 101087- (2021) |
| Druh dokumentu: |
article |
| ISSN: |
2214-157X |
| DOI: |
10.1016/j.csite.2021.101087 |
| Popis: |
Elderly care institutions in Taiwan are mostly equipped with ceiling fans to enhance their indoor ventilation. However, detectors are usually installed above ceiling fans. It is necessary to evaluate the influence of the airflow field on the functions of the detectors. The airflow fields generated by ceiling fans are complex due to the rotation of blades during operation. Using burning smokeless candles as the fire sources, the temperature distribution recorded by model experiments and the flow patterns recorded by Schlieren photography were analyzed. Effective fire detectors are important in institutions, as they can detect fires early. Unfortunately, the results of this study proved that the airflow fields significantly and negatively influence the functions of fire detectors. According to the results, the airflow generated by fans can destroy fire plume patterns and significantly reduce the temperature near the ceiling. The Schlieren images showed a significant entrained airflow. The rising heat was found to be taken by one side above the fans, causing the ceiling temperature distribution to change. The temperature was high on one side and low on the other side. Fire detectors are less likely to detect when the fire source is far from the ceiling fan. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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