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- Publisher Website: 10.1016/j.buildenv.2021.107790
- Scopus: eid_2-s2.0-85102805970
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Article: What dominates personal exposure? Ambient airflow pattern or local human thermal plume
| Title | What dominates personal exposure? Ambient airflow pattern or local human thermal plume |
|---|---|
| Authors | |
| Keywords | Downward ventilation Human micro-environment Human thermal plume Multiple flow solutions Personal exposure |
| Issue Date | 1-Jun-2021 |
| Publisher | Elsevier |
| Citation | Building and Environment, 2021, v. 196 How to Cite? |
| Abstract | The interaction between ambient airflow and human thermal plume may affect airflow distribution in human micro-environment and then personal exposure. This study aims to investigate this interaction and to determine what dominates personal exposure: ambient airflow pattern or local human thermal plume. A computational fluid dynamics (CFD) method was employed in a downward ventilated room with a standing person below the supply grill. The research has taken into consideration the effects of room height, supply air opening area on the interaction. Results showed that the airflow was dominated by the downward jet from supply grill when the downward jet velocity was higher than high turning point of 0.275 m/s, but was dominated by the upward human thermal plume when the downward jet velocity was lower than low turning point of 0.075 m/s in the Case where room height is 2.7 m and supply air opening size is 0.6 m × 0.6 m. Dual steady flows were found when the downward jet velocity was between low and high turning point in the same case, indicating that the airflow pattern was determined by initialized airflow field with same boundary conditions. Besides, a higher downward jet velocity, larger air supply opening area and lower height were more likely to produce downward airflow pattern. This study may help to develop appropriate ventilation strategies to reduce personal exposure and save energy. |
| Persistent Identifier | http://hdl.handle.net/10722/350644 |
| ISSN | 2023 Impact Factor: 7.1 2023 SCImago Journal Rankings: 1.647 |
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.author | Ma, Jianchao | - |
| dc.contributor.author | Qian, Hua | - |
| dc.contributor.author | Nielsen, Peter V | - |
| dc.contributor.author | Liu, Li | - |
| dc.contributor.author | Li, Yuguo | - |
| dc.contributor.author | Zheng, Xiaohong | - |
| dc.date.accessioned | 2024-10-31T00:30:35Z | - |
| dc.date.available | 2024-10-31T00:30:35Z | - |
| dc.date.issued | 2021-06-01 | - |
| dc.identifier.citation | Building and Environment, 2021, v. 196 | - |
| dc.identifier.issn | 0360-1323 | - |
| dc.identifier.uri | http://hdl.handle.net/10722/350644 | - |
| dc.description.abstract | <p>The interaction between ambient airflow and human <a href="https://www.sciencedirect.com/topics/engineering/thermal-plume" title="Learn more about thermal plume from ScienceDirect's AI-generated Topic Pages">thermal plume</a> may affect airflow distribution in human micro-environment and then personal exposure. This study aims to investigate this interaction and to determine what dominates personal exposure: ambient <a href="https://www.sciencedirect.com/topics/engineering/airflow-pattern" title="Learn more about airflow pattern from ScienceDirect's AI-generated Topic Pages">airflow pattern</a> or local human <a href="https://www.sciencedirect.com/topics/engineering/thermal-plume" title="Learn more about thermal plume from ScienceDirect's AI-generated Topic Pages">thermal plume</a>. A <a href="https://www.sciencedirect.com/topics/engineering/computational-fluid-dynamics" title="Learn more about computational fluid dynamics from ScienceDirect's AI-generated Topic Pages">computational fluid dynamics</a> (CFD) method was employed in a downward ventilated room with a standing person below the supply grill. The research has taken into consideration the effects of room height, supply air opening area on the interaction. Results showed that the airflow was dominated by the downward jet from supply grill when the downward <a href="https://www.sciencedirect.com/topics/engineering/jet-velocity" title="Learn more about jet velocity from ScienceDirect's AI-generated Topic Pages">jet velocity</a> was higher than high turning point of 0.275 m/s, but was dominated by the upward human thermal plume when the downward <a href="https://www.sciencedirect.com/topics/engineering/jet-velocity" title="Learn more about jet velocity from ScienceDirect's AI-generated Topic Pages">jet velocity</a> was lower than low turning point of 0.075 m/s in the Case where room height is 2.7 m and supply air opening size is 0.6 m × 0.6 m. Dual <a href="https://www.sciencedirect.com/topics/engineering/steady-flow" title="Learn more about steady flows from ScienceDirect's AI-generated Topic Pages">steady flows</a> were found when the downward jet velocity was between low and high turning point in the same case, indicating that the <a href="https://www.sciencedirect.com/topics/engineering/airflow-pattern" title="Learn more about airflow pattern from ScienceDirect's AI-generated Topic Pages">airflow pattern</a> was determined by initialized <a href="https://www.sciencedirect.com/topics/engineering/airflow-field" title="Learn more about airflow field from ScienceDirect's AI-generated Topic Pages">airflow field</a> with same boundary conditions. Besides, a higher downward jet velocity, larger air supply opening area and lower height were more likely to produce downward airflow pattern. This study may help to develop appropriate ventilation strategies to reduce personal exposure and save energy.<br></p> | - |
| dc.language | eng | - |
| dc.publisher | Elsevier | - |
| dc.relation.ispartof | Building and Environment | - |
| dc.subject | Downward ventilation | - |
| dc.subject | Human micro-environment | - |
| dc.subject | Human thermal plume | - |
| dc.subject | Multiple flow solutions | - |
| dc.subject | Personal exposure | - |
| dc.title | What dominates personal exposure? Ambient airflow pattern or local human thermal plume | - |
| dc.type | Article | - |
| dc.identifier.doi | 10.1016/j.buildenv.2021.107790 | - |
| dc.identifier.scopus | eid_2-s2.0-85102805970 | - |
| dc.identifier.volume | 196 | - |
| dc.identifier.eissn | 1873-684X | - |
| dc.identifier.issnl | 0360-1323 | - |