Airflow measurements using averaging Pitot tube under restricted conditions
This paper studies the effect of the air damper placed downstream of an averaging Pitot tube (APT) on the flow measurement in air distribution systems. Experiments are conducted to obtain the characteristic curve of the APT under different damper positions. The analysis of variance (ANOVA) is applie...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2020
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/141014 |
| _version_ | 1826123215559196672 |
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| author | Cui, Can Cai, Wenjian Chen, Haoran |
| author2 | School of Electrical and Electronic Engineering |
| author_facet | School of Electrical and Electronic Engineering Cui, Can Cai, Wenjian Chen, Haoran |
| author_sort | Cui, Can |
| collection | NTU |
| description | This paper studies the effect of the air damper placed downstream of an averaging Pitot tube (APT) on the flow measurement in air distribution systems. Experiments are conducted to obtain the characteristic curve of the APT under different damper positions. The analysis of variance (ANOVA) is applied and the results reveals a statistically significant correlation between them. A mathematical model for the pressure coefficient with respect to the damper opening angle is proposed to compensate the systematic error caused by the damper. The model is validated under various Reynolds numbers (Re) varying from 6.38 × 103 to 19.1 × 103 with RMSE < 0.02. By applying the proposed model, the flow measurement errors are reduced below 0.6% for all tested cases, and the highest accuracy (0.02%) is achieved when Re = 9.57 × 103. The proposed model significantly improves the performance of current air flow control stations (AFCS) where the ATP is placed immediately upstream of the air damper. This research can be helpful for manufactures to provide AFCS with higher accuracy and larger operating range. |
| first_indexed | 2024-10-01T06:01:00Z |
| format | Journal Article |
| id | ntu-10356/141014 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:01:00Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1410142020-06-03T07:18:11Z Airflow measurements using averaging Pitot tube under restricted conditions Cui, Can Cai, Wenjian Chen, Haoran School of Electrical and Electronic Engineering Centre for System Intelligence and Efficiency Centre for E-City Engineering::Electrical and electronic engineering Air Distribution System Air Flow Control Station This paper studies the effect of the air damper placed downstream of an averaging Pitot tube (APT) on the flow measurement in air distribution systems. Experiments are conducted to obtain the characteristic curve of the APT under different damper positions. The analysis of variance (ANOVA) is applied and the results reveals a statistically significant correlation between them. A mathematical model for the pressure coefficient with respect to the damper opening angle is proposed to compensate the systematic error caused by the damper. The model is validated under various Reynolds numbers (Re) varying from 6.38 × 103 to 19.1 × 103 with RMSE < 0.02. By applying the proposed model, the flow measurement errors are reduced below 0.6% for all tested cases, and the highest accuracy (0.02%) is achieved when Re = 9.57 × 103. The proposed model significantly improves the performance of current air flow control stations (AFCS) where the ATP is placed immediately upstream of the air damper. This research can be helpful for manufactures to provide AFCS with higher accuracy and larger operating range. NRF (Natl Research Foundation, S’pore) 2020-06-03T07:18:11Z 2020-06-03T07:18:11Z 2018 Journal Article Cui, C., Cai, W., & Chen, H. (2018). Airflow measurements using averaging Pitot tube under restricted conditions. Building and Environment, 139, 17-26. doi:10.1016/j.buildenv.2018.05.014 0360-1323 https://hdl.handle.net/10356/141014 10.1016/j.buildenv.2018.05.014 2-s2.0-85047081101 139 17 26 en Building and Environment © 2018 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Electrical and electronic engineering Air Distribution System Air Flow Control Station Cui, Can Cai, Wenjian Chen, Haoran Airflow measurements using averaging Pitot tube under restricted conditions |
| title | Airflow measurements using averaging Pitot tube under restricted conditions |
| title_full | Airflow measurements using averaging Pitot tube under restricted conditions |
| title_fullStr | Airflow measurements using averaging Pitot tube under restricted conditions |
| title_full_unstemmed | Airflow measurements using averaging Pitot tube under restricted conditions |
| title_short | Airflow measurements using averaging Pitot tube under restricted conditions |
| title_sort | airflow measurements using averaging pitot tube under restricted conditions |
| topic | Engineering::Electrical and electronic engineering Air Distribution System Air Flow Control Station |
| url | https://hdl.handle.net/10356/141014 |
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