Evaluation of thermal comfort criteria of an active chilled beam system in tropical climate : a comparative study

Air-conditioning systems are employed to provide thermal comfort inside buildings. Therefore, several air-conditioning and mechanical ventilation (ACMV) systems have been tested and applied in different climates. Chilled beam systems are a new addition to it and have been in the application in Europ...

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Main Authors: Lamano, Adrian Sansoldi, Azad, Abdus Salam, Rakshit, Dibakar, Wan, Man Pun, Babu, Sushanth, Sarvaiya, Jatin N., Zhang, Zhe, Krishnasayee, Krithika, Gao, Chun Ping, Valliappan, Selvam, Goh, Alice, Seoh, Alvin, Kumar, Divya E. V. S. Kiran
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2019
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Online Access:https://hdl.handle.net/10356/105621
http://hdl.handle.net/10220/50261
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1056212021-01-08T07:09:48Z Evaluation of thermal comfort criteria of an active chilled beam system in tropical climate : a comparative study Lamano, Adrian Sansoldi Azad, Abdus Salam Rakshit, Dibakar Wan, Man Pun Babu, Sushanth Sarvaiya, Jatin N. Zhang, Zhe Krishnasayee, Krithika Gao, Chun Ping Valliappan, Selvam Goh, Alice Seoh, Alvin Kumar, Divya E. V. S. Kiran School of Mechanical and Aerospace Engineering Energy Research Institute @ NTU (ERI@N) Active Chilled Beam Engineering::Mechanical engineering Conventional Fan Coil Unit Air-conditioning systems are employed to provide thermal comfort inside buildings. Therefore, several air-conditioning and mechanical ventilation (ACMV) systems have been tested and applied in different climates. Chilled beam systems are a new addition to it and have been in the application in Europe and North America since last two decades. In the present study, comparative performance of active chilled beam (ACB) system with conventional fan coil unit (FCU) system has been appraised in regards to thermal comfort for the tropical region of Singapore. Experiments were carried out in a simulated office building with approximately 80% glazed area under real environmental conditions. Room air temperature, air velocity, mean radiant temperature (MRT) and relative humidity which are important thermal comfort parameters were measured in perimeter zone inside the cells and assessed. It was perceived that the ACB system was providing acceptable thermal comfort as per the standard of SS 554. General thermal comfort has been assessed based on an index of PMV-PPD model and graphical method. With regard to the local thermal discomfort: indices of air draught, vertical air temperature difference (VATD) and radiant temperature asymmetry have also been evaluated. The entrance of solar radiation through window façade may have a significant impact on the asymmetry of the radiant field and can enhance thermal discomfort of the occupants. Therefore, in the study radiant temperature asymmetry has been calculated extensively. The results show that ACB system yields satisfactory thermal environment as per ISO 7730 standard and sometimes performs even better than conventional FCU system. Accepted version 2019-10-25T02:57:02Z 2019-12-06T21:54:42Z 2019-10-25T02:57:02Z 2019-12-06T21:54:42Z 2018 Journal Article Azad, A. S., Rakshit, D., Wan, M. P., Babu, S., Sarvaiya, J. N., Kumar, D. E. V. S. K., . . . Seoh, A. (2018). Evaluation of thermal comfort criteria of an active chilled beam system in tropical climate : a comparative study. Building and Environment, 145, 196-212. doi:10.1016/j.buildenv.2018.09.025 0360-1323 https://hdl.handle.net/10356/105621 http://hdl.handle.net/10220/50261 10.1016/j.buildenv.2018.09.025 en Building and Environment © 2018 Elsevier Ltd. All rights reserved. This paper was published in Building and Environment and is made available with permission of Elsevier Ltd. 51 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Active Chilled Beam
Engineering::Mechanical engineering
Conventional Fan Coil Unit
spellingShingle Active Chilled Beam
Engineering::Mechanical engineering
Conventional Fan Coil Unit
Lamano, Adrian Sansoldi
Azad, Abdus Salam
Rakshit, Dibakar
Wan, Man Pun
Babu, Sushanth
Sarvaiya, Jatin N.
Zhang, Zhe
Krishnasayee, Krithika
Gao, Chun Ping
Valliappan, Selvam
Goh, Alice
Seoh, Alvin
Kumar, Divya E. V. S. Kiran
Evaluation of thermal comfort criteria of an active chilled beam system in tropical climate : a comparative study
description Air-conditioning systems are employed to provide thermal comfort inside buildings. Therefore, several air-conditioning and mechanical ventilation (ACMV) systems have been tested and applied in different climates. Chilled beam systems are a new addition to it and have been in the application in Europe and North America since last two decades. In the present study, comparative performance of active chilled beam (ACB) system with conventional fan coil unit (FCU) system has been appraised in regards to thermal comfort for the tropical region of Singapore. Experiments were carried out in a simulated office building with approximately 80% glazed area under real environmental conditions. Room air temperature, air velocity, mean radiant temperature (MRT) and relative humidity which are important thermal comfort parameters were measured in perimeter zone inside the cells and assessed. It was perceived that the ACB system was providing acceptable thermal comfort as per the standard of SS 554. General thermal comfort has been assessed based on an index of PMV-PPD model and graphical method. With regard to the local thermal discomfort: indices of air draught, vertical air temperature difference (VATD) and radiant temperature asymmetry have also been evaluated. The entrance of solar radiation through window façade may have a significant impact on the asymmetry of the radiant field and can enhance thermal discomfort of the occupants. Therefore, in the study radiant temperature asymmetry has been calculated extensively. The results show that ACB system yields satisfactory thermal environment as per ISO 7730 standard and sometimes performs even better than conventional FCU system.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Lamano, Adrian Sansoldi
Azad, Abdus Salam
Rakshit, Dibakar
Wan, Man Pun
Babu, Sushanth
Sarvaiya, Jatin N.
Zhang, Zhe
Krishnasayee, Krithika
Gao, Chun Ping
Valliappan, Selvam
Goh, Alice
Seoh, Alvin
Kumar, Divya E. V. S. Kiran
format Article
author Lamano, Adrian Sansoldi
Azad, Abdus Salam
Rakshit, Dibakar
Wan, Man Pun
Babu, Sushanth
Sarvaiya, Jatin N.
Zhang, Zhe
Krishnasayee, Krithika
Gao, Chun Ping
Valliappan, Selvam
Goh, Alice
Seoh, Alvin
Kumar, Divya E. V. S. Kiran
author_sort Lamano, Adrian Sansoldi
title Evaluation of thermal comfort criteria of an active chilled beam system in tropical climate : a comparative study
title_short Evaluation of thermal comfort criteria of an active chilled beam system in tropical climate : a comparative study
title_full Evaluation of thermal comfort criteria of an active chilled beam system in tropical climate : a comparative study
title_fullStr Evaluation of thermal comfort criteria of an active chilled beam system in tropical climate : a comparative study
title_full_unstemmed Evaluation of thermal comfort criteria of an active chilled beam system in tropical climate : a comparative study
title_sort evaluation of thermal comfort criteria of an active chilled beam system in tropical climate : a comparative study
publishDate 2019
url https://hdl.handle.net/10356/105621
http://hdl.handle.net/10220/50261
_version_ 1688665550024081408