Cover Image

Thermal Comfort Analysis for Overhead and Underfloor Air Distribution Systems

Underfloor and overhead air distributions are two types of Heating Ventilating and Air Conditioning (HVAC) system in which both differs in term of channelling the supplied air into a space. Underfloor air distribution (UFAD) system channels the supplied air from the underfloor plenum and goes to the...

Full description

Saved in:
Bibliographic Details
Main Authors: Ismail F.B., Al-Muhsen N.F.O., Johari A.A.
Other Authors: 58027086700
Format: Article
Published: Penerbit Akademia Baru 2023
Tags: Add Tag
No Tags, Be the first to tag this record!
id my.uniten.dspace-25854
record_format dspace
spelling my.uniten.dspace-258542023-05-29T17:05:18Z Thermal Comfort Analysis for Overhead and Underfloor Air Distribution Systems Ismail F.B. Al-Muhsen N.F.O. Johari A.A. 58027086700 57197748656 57413179700 Underfloor and overhead air distributions are two types of Heating Ventilating and Air Conditioning (HVAC) system in which both differs in term of channelling the supplied air into a space. Underfloor air distribution (UFAD) system channels the supplied air from the underfloor plenum and goes to the return vent at the ceiling. On the other hand, the overhead air distribution (OHAD) system utilizes the ceiling-to-ceiling air pathway approach. In this study, A developed HVAC model was proposed. Ansys Fluent program was used to numerically investigate the best thermal comfort of the proposed model in terms of occupant satisfaction by referring to ASHRAE Standard. Two scenarios were designed and adopted in the computational investigation which is OHAD and UFAD. Three heat-generating parameters were involved which are a room lamp, personal computer and occupant. The attained computational fluid dynamic (CFD) simulation results were validated. Generally, the attained CFD results showed that the UFAD system could perform better compare to the OHAD system even though the OHAD system could have some benefits. Specifically, the UFAD system provided the best thermal performance whereas the OHAD system was found to be less efficient in providing thermal comfort to the occupant and consumed a greater amount of energy because it was required to cool down the whole room instead of being cooled partly. The CFD results confirmed that the UFAD system was capable of maintaining the room temperature at 26�C at a height below 2.0 m compared to 1.2 m of the OHAD system. In conclusion, the UFAD system could provide better indoor air quality, and it could have superior performance for the tropic weather regions such as Malaysia compared to that of the OHAD system. Besides, using the UFAD system could be represented a preventive action that could be proposed to solve the mould growth inside any occupied room. � 2021, Penerbit Akademia Baru. All rights reserved. Final 2023-05-29T09:05:18Z 2023-05-29T09:05:18Z 2021 Article 10.37934/cfdl.13.12.113132 2-s2.0-85122867841 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85122867841&doi=10.37934%2fcfdl.13.12.113132&partnerID=40&md5=dd6c1457bbb1fa7723c92cb2d5f27ef4 https://irepository.uniten.edu.my/handle/123456789/25854 13 12 113 132 All Open Access, Hybrid Gold Penerbit Akademia Baru Scopus
institution Universiti Tenaga Nasional
building UNITEN Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Tenaga Nasional
content_source UNITEN Institutional Repository
url_provider http://dspace.uniten.edu.my/
description Underfloor and overhead air distributions are two types of Heating Ventilating and Air Conditioning (HVAC) system in which both differs in term of channelling the supplied air into a space. Underfloor air distribution (UFAD) system channels the supplied air from the underfloor plenum and goes to the return vent at the ceiling. On the other hand, the overhead air distribution (OHAD) system utilizes the ceiling-to-ceiling air pathway approach. In this study, A developed HVAC model was proposed. Ansys Fluent program was used to numerically investigate the best thermal comfort of the proposed model in terms of occupant satisfaction by referring to ASHRAE Standard. Two scenarios were designed and adopted in the computational investigation which is OHAD and UFAD. Three heat-generating parameters were involved which are a room lamp, personal computer and occupant. The attained computational fluid dynamic (CFD) simulation results were validated. Generally, the attained CFD results showed that the UFAD system could perform better compare to the OHAD system even though the OHAD system could have some benefits. Specifically, the UFAD system provided the best thermal performance whereas the OHAD system was found to be less efficient in providing thermal comfort to the occupant and consumed a greater amount of energy because it was required to cool down the whole room instead of being cooled partly. The CFD results confirmed that the UFAD system was capable of maintaining the room temperature at 26�C at a height below 2.0 m compared to 1.2 m of the OHAD system. In conclusion, the UFAD system could provide better indoor air quality, and it could have superior performance for the tropic weather regions such as Malaysia compared to that of the OHAD system. Besides, using the UFAD system could be represented a preventive action that could be proposed to solve the mould growth inside any occupied room. � 2021, Penerbit Akademia Baru. All rights reserved.
author2 58027086700
author_facet 58027086700
Ismail F.B.
Al-Muhsen N.F.O.
Johari A.A.
format Article
author Ismail F.B.
Al-Muhsen N.F.O.
Johari A.A.
spellingShingle Ismail F.B.
Al-Muhsen N.F.O.
Johari A.A.
Thermal Comfort Analysis for Overhead and Underfloor Air Distribution Systems
author_sort Ismail F.B.
title Thermal Comfort Analysis for Overhead and Underfloor Air Distribution Systems
title_short Thermal Comfort Analysis for Overhead and Underfloor Air Distribution Systems
title_full Thermal Comfort Analysis for Overhead and Underfloor Air Distribution Systems
title_fullStr Thermal Comfort Analysis for Overhead and Underfloor Air Distribution Systems
title_full_unstemmed Thermal Comfort Analysis for Overhead and Underfloor Air Distribution Systems
title_sort thermal comfort analysis for overhead and underfloor air distribution systems
publisher Penerbit Akademia Baru
publishDate 2023
_version_ 1806426444331483136
score 13.211869

Similar Items