Heat source effects on thermal comfort for active chilled beam systems

In this study, the effects of the configuration and strength of heat sources on thermal comfort are investigated in a mock-up room with an active chilled beam (ACB) system. Full-scale air temperature, speed, and humidity distributions are demonstrated. In addition, the uniformity of the distribution...

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Main Authors: Wu, Bingjie, Cai, Wenjian, Ji, Ke
Other Authors: School of Electrical and Electronic Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/141018
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1410182021-01-08T07:45:46Z Heat source effects on thermal comfort for active chilled beam systems Wu, Bingjie Cai, Wenjian Ji, Ke School of Electrical and Electronic Engineering Interdisciplinary Graduate School (IGS) Energy Research Institute @ NTU (ERI@N) Engineering::Electrical and electronic engineering Thermal Comfort Heat Source In this study, the effects of the configuration and strength of heat sources on thermal comfort are investigated in a mock-up room with an active chilled beam (ACB) system. Full-scale air temperature, speed, and humidity distributions are demonstrated. In addition, the uniformity of the distributions is evaluated. Several common thermal comfort indices, including the air diffusion performance index (ADPI), predicted mean vote (PMV), draft rate (DR), and vertical air temperature difference (VATD) are calculated and compared based on the experimental results. The results reveal that the heat sources increase the average air speed of the occupied zone. However, the air speed distribution is not significantly affected by the heat source configuration for a primary airflow rate of 32.2 L/s. In contrast, the heat source configuration has a notable impact on the temperature distribution. One humidity sensor is sufficient to measure the occupied zone humidity for ACB systems with no significant humidity source because the absolute humidity distributions are extremely uniform for all cases. The points outside the ADPI criteria (−1.7°C<Ted<+1.1°Candv<0.35m/s) are mostly because its air speed is greater than 0.35 m/s. PMV is reduced as the air speed increases. Thus, there is a higher risk of cold feeling at the ankel level where the air speed is relatively greater than other levels. The overall evaluation shows that symmetrical heat source placement results in better thermal comfort performance than asymmetrical heat sources. NRF (Natl Research Foundation, S’pore) 2020-06-03T07:36:33Z 2020-06-03T07:36:33Z 2018 Journal Article Wu, B., Cai, W., & Ji, K. (2018). Heat source effects on thermal comfort for active chilled beam systems. Building and Environment, 141, 91-102. doi:10.1016/j.buildenv.2018.05.045 0360-1323 https://hdl.handle.net/10356/141018 10.1016/j.buildenv.2018.05.045 2-s2.0-85047726758 141 91 102 en Building and Environment © 2018 Elsevier Ltd. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Electrical and electronic engineering
Thermal Comfort
Heat Source
spellingShingle Engineering::Electrical and electronic engineering
Thermal Comfort
Heat Source
Wu, Bingjie
Cai, Wenjian
Ji, Ke
Heat source effects on thermal comfort for active chilled beam systems
description In this study, the effects of the configuration and strength of heat sources on thermal comfort are investigated in a mock-up room with an active chilled beam (ACB) system. Full-scale air temperature, speed, and humidity distributions are demonstrated. In addition, the uniformity of the distributions is evaluated. Several common thermal comfort indices, including the air diffusion performance index (ADPI), predicted mean vote (PMV), draft rate (DR), and vertical air temperature difference (VATD) are calculated and compared based on the experimental results. The results reveal that the heat sources increase the average air speed of the occupied zone. However, the air speed distribution is not significantly affected by the heat source configuration for a primary airflow rate of 32.2 L/s. In contrast, the heat source configuration has a notable impact on the temperature distribution. One humidity sensor is sufficient to measure the occupied zone humidity for ACB systems with no significant humidity source because the absolute humidity distributions are extremely uniform for all cases. The points outside the ADPI criteria (−1.7°C<Ted<+1.1°Candv<0.35m/s) are mostly because its air speed is greater than 0.35 m/s. PMV is reduced as the air speed increases. Thus, there is a higher risk of cold feeling at the ankel level where the air speed is relatively greater than other levels. The overall evaluation shows that symmetrical heat source placement results in better thermal comfort performance than asymmetrical heat sources.
author2 School of Electrical and Electronic Engineering
author_facet School of Electrical and Electronic Engineering
Wu, Bingjie
Cai, Wenjian
Ji, Ke
format Article
author Wu, Bingjie
Cai, Wenjian
Ji, Ke
author_sort Wu, Bingjie
title Heat source effects on thermal comfort for active chilled beam systems
title_short Heat source effects on thermal comfort for active chilled beam systems
title_full Heat source effects on thermal comfort for active chilled beam systems
title_fullStr Heat source effects on thermal comfort for active chilled beam systems
title_full_unstemmed Heat source effects on thermal comfort for active chilled beam systems
title_sort heat source effects on thermal comfort for active chilled beam systems
publishDate 2020
url https://hdl.handle.net/10356/141018
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