A Numerical and Experimental Investigation of a Confluent Jets Ventilation Supply Device in a Conference Room
In this study, confluent jets ventilation (CJV) supply devices with three different nozzle arrays (1 × 19, 2 × 19, 3 × 19) were investigated both numerically and experimentally at two different airflow and supply air temperature set-ups. The performance of the CJV supply devices was investigated con...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-02-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/15/5/1630 |
| _version_ | 1797475259018903552 |
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| author | Harald Andersson Mathias Cehlin Bahram Moshfegh |
| author_facet | Harald Andersson Mathias Cehlin Bahram Moshfegh |
| author_sort | Harald Andersson |
| collection | DOAJ |
| description | In this study, confluent jets ventilation (CJV) supply devices with three different nozzle arrays (1 × 19, 2 × 19, 3 × 19) were investigated both numerically and experimentally at two different airflow and supply air temperature set-ups. The performance of the CJV supply devices was investigated concerning thermal comfort, indoor air quality (IAQ), and heat removal effectiveness in a conference room environment. A comparison between the experimental and numerical results showed that the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo> </mo><mover accent="true"><mrow><msup><mo>ϑ</mo><mn>2</mn></msup></mrow><mo stretchy="true">¯</mo></mover><mo>−</mo><mi>f</mi></mrow></semantics></math></inline-formula> model had the best agreement out of the investigated turbulence models. The numerical results showed that the size of the array had a great impact both on near-field development and on the conditions in the occupied zone. A larger array with multiple rows and a lower momentum conserved the inlet temperature and the mean age of the air better than a single-row array with a higher momentum. A larger array with multiple rows had a higher IAQ and a greater heat removal effectiveness in the occupied zone because the larger array conserved the mean age of air better and the buoyancy driven flow was slightly better at removing the heat. Because of the lower inlet velocities, they also had lower velocities at ankle level, which decreased the risk of draft and thermal discomfort. |
| first_indexed | 2024-03-09T20:41:35Z |
| format | Article |
| id | doaj.art-2494cd617c2442918ad63cd467934f9f |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-09T20:41:35Z |
| publishDate | 2022-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-2494cd617c2442918ad63cd467934f9f2023-11-23T22:55:08ZengMDPI AGEnergies1996-10732022-02-01155163010.3390/en15051630A Numerical and Experimental Investigation of a Confluent Jets Ventilation Supply Device in a Conference RoomHarald Andersson0Mathias Cehlin1Bahram Moshfegh2Department of Building Engineering, Energy Systems and Sustainability Science, University of Gävle, 80176 Gävle, SwedenDepartment of Building Engineering, Energy Systems and Sustainability Science, University of Gävle, 80176 Gävle, SwedenDepartment of Building Engineering, Energy Systems and Sustainability Science, University of Gävle, 80176 Gävle, SwedenIn this study, confluent jets ventilation (CJV) supply devices with three different nozzle arrays (1 × 19, 2 × 19, 3 × 19) were investigated both numerically and experimentally at two different airflow and supply air temperature set-ups. The performance of the CJV supply devices was investigated concerning thermal comfort, indoor air quality (IAQ), and heat removal effectiveness in a conference room environment. A comparison between the experimental and numerical results showed that the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo> </mo><mover accent="true"><mrow><msup><mo>ϑ</mo><mn>2</mn></msup></mrow><mo stretchy="true">¯</mo></mover><mo>−</mo><mi>f</mi></mrow></semantics></math></inline-formula> model had the best agreement out of the investigated turbulence models. The numerical results showed that the size of the array had a great impact both on near-field development and on the conditions in the occupied zone. A larger array with multiple rows and a lower momentum conserved the inlet temperature and the mean age of the air better than a single-row array with a higher momentum. A larger array with multiple rows had a higher IAQ and a greater heat removal effectiveness in the occupied zone because the larger array conserved the mean age of air better and the buoyancy driven flow was slightly better at removing the heat. Because of the lower inlet velocities, they also had lower velocities at ankle level, which decreased the risk of draft and thermal discomfort.https://www.mdpi.com/1996-1073/15/5/1630experimental investigationsnumerical investigationsconfluent jet ventilationventilation efficiencyindoor air quality |
| spellingShingle | Harald Andersson Mathias Cehlin Bahram Moshfegh A Numerical and Experimental Investigation of a Confluent Jets Ventilation Supply Device in a Conference Room Energies experimental investigations numerical investigations confluent jet ventilation ventilation efficiency indoor air quality |
| title | A Numerical and Experimental Investigation of a Confluent Jets Ventilation Supply Device in a Conference Room |
| title_full | A Numerical and Experimental Investigation of a Confluent Jets Ventilation Supply Device in a Conference Room |
| title_fullStr | A Numerical and Experimental Investigation of a Confluent Jets Ventilation Supply Device in a Conference Room |
| title_full_unstemmed | A Numerical and Experimental Investigation of a Confluent Jets Ventilation Supply Device in a Conference Room |
| title_short | A Numerical and Experimental Investigation of a Confluent Jets Ventilation Supply Device in a Conference Room |
| title_sort | numerical and experimental investigation of a confluent jets ventilation supply device in a conference room |
| topic | experimental investigations numerical investigations confluent jet ventilation ventilation efficiency indoor air quality |
| url | https://www.mdpi.com/1996-1073/15/5/1630 |
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