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Title: Thermal comfort and energy analysis of a hybrid cooling system by coupling natural ventilation with radiant and indirect evaporative cooling
Authors: Shakya, Pradeep
Ng, Gimson
Zhou, Xiaoli
Wong, Yew Wah
Dubey, Swapnil
Qian, Shunzhi
Keywords: Engineering::Civil engineering
Issue Date: 2021
Source: 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-.
Project: I1801E0020 
Journal: Energies 
Abstract: 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.
ISSN: 1996-1073
DOI: 10.3390/en14227825
Schools: School of Civil and Environmental Engineering 
Research Centres: SJ-NTU Corporate Lab
S-Lab for Advanced Intelligence
Energy Research Institute @ NTU (ERI@N) 
Rights: © 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:// 4.0/).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:CEE Journal Articles
ERI@N Journal Articles

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