A study of the effectiveness of local exhaust ventilation (LEV) in training facilities building using computational fluid dynamics (CFD) approach
The purpose of this study is to identify effectiveness of local exhaust ventilation (LEV) systems and to validate computational fluid dynamics (CFD) simulation results with actual experimental results. Three case studies had been conducted at Ventilation Laboratory in National Institute of Occupa...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2013
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| Online Access: | http://eprints.uthm.edu.my/1999/1/24p%20NG%20CHEE%20SENG.pdf http://eprints.uthm.edu.my/1999/2/NG%20CHEE%20SENG%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/1999/3/NG%20CHEE%20SENG%20WATERMARK.pdf |
| _version_ | 1825709642041262080 |
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| author | Ng, Chee Seng |
| author_facet | Ng, Chee Seng |
| author_sort | Ng, Chee Seng |
| collection | UTHM |
| description | The purpose of this study is to identify effectiveness of local exhaust ventilation (LEV)
systems and to validate computational fluid dynamics (CFD) simulation results with
actual experimental results. Three case studies had been conducted at Ventilation
Laboratory in National Institute of Occupational Safety and Health (NIOSH) Bangi,
Welding Laboratory and Thermal Environmental Laboratory in Universiti Tun Hussein
Onn Malaysia (UTHM). LEV is a ventilation system that captures contaminants, for
example dusts, mists, gases, vapours or fumes out from workstations, so that they can‟t
be breathed by occupants. Employers allocate and install LEV in order to protect
occupants‟ exposure to contaminants, but it doesn‟t work properly. To overcome this
issue, Guidelines on Occupational Safety and Health for Design, Inspection, Testing and
Examination of LEV system and CFD can be implemented. The guideline stated that the
recommended minimum hood velocity is 100 ft/min; while the recommended velocity
along ducts for vapours, gases, smoke is 1000 ft/min and 2000 ft/min is required for
welding. It was found that Ventilation Laboratory in NIOSH Bangi using Control Speed
of 80%, Welding Laboratory and Thermal Environmental Laboratory in UTHM met all
the minimum requirements set by the guideline, where LEV systems are effective to be
used. In terms of CFD modeling, upon validation, average absolute error obtained from
three case studies ranges from 2.804% and 4.862%. Validity of CFD modeling is
acceptable, which is less than 5% and good agreement is achieved between actual
experimental results and CFD simulation results. Therefore, it can be concluded that
simple CFD modeling can be performed as a tool to simulate air velocity in LEV system,
which saves labour costs and time consumption when it is used during earliest stage of
LEV design development prior to actual construction. The outcome of this study can be
used as a benchmark or guideline for training facilities building equipped with LEV
system to protect occupants‟ health. |
| first_indexed | 2024-03-05T21:41:41Z |
| format | Thesis |
| id | uthm.eprints-1999 |
| institution | Universiti Tun Hussein Onn Malaysia |
| language | English English English |
| last_indexed | 2024-03-05T21:41:41Z |
| publishDate | 2013 |
| record_format | dspace |
| spelling | uthm.eprints-19992021-10-14T05:54:08Z http://eprints.uthm.edu.my/1999/ A study of the effectiveness of local exhaust ventilation (LEV) in training facilities building using computational fluid dynamics (CFD) approach Ng, Chee Seng TH Building construction TH7005-7699 Heating and ventilation. Air conditioning The purpose of this study is to identify effectiveness of local exhaust ventilation (LEV) systems and to validate computational fluid dynamics (CFD) simulation results with actual experimental results. Three case studies had been conducted at Ventilation Laboratory in National Institute of Occupational Safety and Health (NIOSH) Bangi, Welding Laboratory and Thermal Environmental Laboratory in Universiti Tun Hussein Onn Malaysia (UTHM). LEV is a ventilation system that captures contaminants, for example dusts, mists, gases, vapours or fumes out from workstations, so that they can‟t be breathed by occupants. Employers allocate and install LEV in order to protect occupants‟ exposure to contaminants, but it doesn‟t work properly. To overcome this issue, Guidelines on Occupational Safety and Health for Design, Inspection, Testing and Examination of LEV system and CFD can be implemented. The guideline stated that the recommended minimum hood velocity is 100 ft/min; while the recommended velocity along ducts for vapours, gases, smoke is 1000 ft/min and 2000 ft/min is required for welding. It was found that Ventilation Laboratory in NIOSH Bangi using Control Speed of 80%, Welding Laboratory and Thermal Environmental Laboratory in UTHM met all the minimum requirements set by the guideline, where LEV systems are effective to be used. In terms of CFD modeling, upon validation, average absolute error obtained from three case studies ranges from 2.804% and 4.862%. Validity of CFD modeling is acceptable, which is less than 5% and good agreement is achieved between actual experimental results and CFD simulation results. Therefore, it can be concluded that simple CFD modeling can be performed as a tool to simulate air velocity in LEV system, which saves labour costs and time consumption when it is used during earliest stage of LEV design development prior to actual construction. The outcome of this study can be used as a benchmark or guideline for training facilities building equipped with LEV system to protect occupants‟ health. 2013-12 Thesis NonPeerReviewed text en http://eprints.uthm.edu.my/1999/1/24p%20NG%20CHEE%20SENG.pdf text en http://eprints.uthm.edu.my/1999/2/NG%20CHEE%20SENG%20COPYRIGHT%20DECLARATION.pdf text en http://eprints.uthm.edu.my/1999/3/NG%20CHEE%20SENG%20WATERMARK.pdf Ng, Chee Seng (2013) A study of the effectiveness of local exhaust ventilation (LEV) in training facilities building using computational fluid dynamics (CFD) approach. Masters thesis, Universiti Tun Hussein Malaysia. |
| spellingShingle | TH Building construction TH7005-7699 Heating and ventilation. Air conditioning Ng, Chee Seng A study of the effectiveness of local exhaust ventilation (LEV) in training facilities building using computational fluid dynamics (CFD) approach |
| title | A study of the effectiveness of local exhaust ventilation (LEV) in training facilities building using computational fluid dynamics (CFD) approach |
| title_full | A study of the effectiveness of local exhaust ventilation (LEV) in training facilities building using computational fluid dynamics (CFD) approach |
| title_fullStr | A study of the effectiveness of local exhaust ventilation (LEV) in training facilities building using computational fluid dynamics (CFD) approach |
| title_full_unstemmed | A study of the effectiveness of local exhaust ventilation (LEV) in training facilities building using computational fluid dynamics (CFD) approach |
| title_short | A study of the effectiveness of local exhaust ventilation (LEV) in training facilities building using computational fluid dynamics (CFD) approach |
| title_sort | study of the effectiveness of local exhaust ventilation lev in training facilities building using computational fluid dynamics cfd approach |
| topic | TH Building construction TH7005-7699 Heating and ventilation. Air conditioning |
| url | http://eprints.uthm.edu.my/1999/1/24p%20NG%20CHEE%20SENG.pdf http://eprints.uthm.edu.my/1999/2/NG%20CHEE%20SENG%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/1999/3/NG%20CHEE%20SENG%20WATERMARK.pdf |
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