Thermal comfort and energy analysis of a hybrid cooling system by coupling natural ventilation with radiant and indirect evaporative cooling

A hybrid cooling system which combines natural ventilation with a radiant cooling system for a hot and humid climate was studied. Indirect evaporative cooling was used to produce chilled water at temperatures slightly higher than the dew point. With this hybrid system, the condensation issue on the...

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Main Authors: Shakya, Pradeep, Ng, Gimson, Zhou, Xiaoli, Wong, Yew Wah, Dubey, Swapnil, Qian, Shunzhi
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2022
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Online Access:https://hdl.handle.net/10356/160352
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1603522022-07-23T20:11:14Z Thermal comfort and energy analysis of a hybrid cooling system by coupling natural ventilation with radiant and indirect evaporative cooling Shakya, Pradeep Ng, Gimson Zhou, Xiaoli Wong, Yew Wah Dubey, Swapnil Qian, Shunzhi School of Civil and Environmental Engineering SJ-NTU Corporate Lab S-Lab for Advanced Intelligence Energy Research Institute @ NTU (ERI@N) Engineering::Civil engineering Natural Ventilation Radiant Cooling A hybrid cooling system which combines natural ventilation with a radiant cooling system for a hot and humid climate was studied. Indirect evaporative cooling was used to produce chilled water at temperatures slightly higher than the dew point. With this hybrid system, the condensation issue on the panel surface of a chilled ceiling was overcome. A computational fluid dynamics (CFD) model was employed to determine the cooling load and the parameters required for thermal comfort analysis for this hybrid system in an office-sized, well-insulated test room. Upon closer investigation, it was found that the thermal comfort by the hybrid system was acceptable only in limited outdoor conditions. Therefore, the hybrid system with a secondary fresh air supply system was suggested. Furthermore, the energy consumptions of conventional all-air, radiant cooling, and hybrid systems including the secondary air supply system were compared under similar thermal comfort conditions. The predicted results indicated that the hybrid system saves up to 77% and 61% of primary energy when compared with all-air and radiant cooling systems, respectively, while maintaining similar thermal comfort. National Research Foundation (NRF) Published version This research is supported under RIE 2020 grant (Grant number: I1801E0020). 2022-07-19T08:50:15Z 2022-07-19T08:50:15Z 2021 Journal Article Shakya, P., Ng, G., Zhou, X., Wong, Y. W., Dubey, S. & Qian, S. (2021). Thermal comfort and energy analysis of a hybrid cooling system by coupling natural ventilation with radiant and indirect evaporative cooling. Energies, 14(22), 7825-. https://dx.doi.org/10.3390/en14227825 1996-1073 https://hdl.handle.net/10356/160352 10.3390/en14227825 2-s2.0-85119967247 22 14 7825 en I1801E0020 Energies © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/). application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Civil engineering
Natural Ventilation
Radiant Cooling
spellingShingle Engineering::Civil engineering
Natural Ventilation
Radiant Cooling
Shakya, Pradeep
Ng, Gimson
Zhou, Xiaoli
Wong, Yew Wah
Dubey, Swapnil
Qian, Shunzhi
Thermal comfort and energy analysis of a hybrid cooling system by coupling natural ventilation with radiant and indirect evaporative cooling
description A hybrid cooling system which combines natural ventilation with a radiant cooling system for a hot and humid climate was studied. Indirect evaporative cooling was used to produce chilled water at temperatures slightly higher than the dew point. With this hybrid system, the condensation issue on the panel surface of a chilled ceiling was overcome. A computational fluid dynamics (CFD) model was employed to determine the cooling load and the parameters required for thermal comfort analysis for this hybrid system in an office-sized, well-insulated test room. Upon closer investigation, it was found that the thermal comfort by the hybrid system was acceptable only in limited outdoor conditions. Therefore, the hybrid system with a secondary fresh air supply system was suggested. Furthermore, the energy consumptions of conventional all-air, radiant cooling, and hybrid systems including the secondary air supply system were compared under similar thermal comfort conditions. The predicted results indicated that the hybrid system saves up to 77% and 61% of primary energy when compared with all-air and radiant cooling systems, respectively, while maintaining similar thermal comfort.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Shakya, Pradeep
Ng, Gimson
Zhou, Xiaoli
Wong, Yew Wah
Dubey, Swapnil
Qian, Shunzhi
format Article
author Shakya, Pradeep
Ng, Gimson
Zhou, Xiaoli
Wong, Yew Wah
Dubey, Swapnil
Qian, Shunzhi
author_sort Shakya, Pradeep
title Thermal comfort and energy analysis of a hybrid cooling system by coupling natural ventilation with radiant and indirect evaporative cooling
title_short Thermal comfort and energy analysis of a hybrid cooling system by coupling natural ventilation with radiant and indirect evaporative cooling
title_full Thermal comfort and energy analysis of a hybrid cooling system by coupling natural ventilation with radiant and indirect evaporative cooling
title_fullStr Thermal comfort and energy analysis of a hybrid cooling system by coupling natural ventilation with radiant and indirect evaporative cooling
title_full_unstemmed Thermal comfort and energy analysis of a hybrid cooling system by coupling natural ventilation with radiant and indirect evaporative cooling
title_sort thermal comfort and energy analysis of a hybrid cooling system by coupling natural ventilation with radiant and indirect evaporative cooling
publishDate 2022
url https://hdl.handle.net/10356/160352
_version_ 1739837367788765184