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Energies 2015, 8(6), 6079-6097; doi:10.3390/en8066079

Influence of Lighting Loads upon Thermal Comfort under CBAD and UFAD Systems

1
Building Research Department, Korea Institute of Civil Engineering and Building Technology, 283 Goyangdae-Ro, Ilsanseo-Gu, Goyang-Si, Gyeonggi-Do 411-712, Korea
2
Department of Architecture, Hanyang University, 55 Hanyangdaehak-Ro, Sangrok-Gu, Ansan-Si, Gyeonggi-Do 426-791, Korea
3
Department of Architectural Engineering, Namseoul University, Seonghwan-Eup, Seobuk-Gu, Cheonan-Si, Chungcheongnam-Do 331-707, Korea
4
Research Institute of Industrial Science, Hanyang University, 222 Wangsimni-Ro, Seongdong-Gu, Seoul 133-791, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Chi-Ming Lai
Received: 9 March 2015 / Revised: 31 May 2015 / Accepted: 12 June 2015 / Published: 18 June 2015

Abstract

Under-floor air distribution (UFAD) systems are occupied-area-based air conditioning systems that generally offer advantages over ceiling-based air distribution (CBAD) systems in terms of energy efficiency and thermal comfort; accordingly, UFAD systems have become more popular lately. The purpose of this study is to provide reasonable UFAD application conditions by comparing and analyzing the influences of cooling loads when UFAD and CBAD are applied to thermally control indoor environments. A chamber experiment was conducted to allow comparisons of the indoor thermal environment under CBAD and UFAD, with the experimental variables of the thermal load of the occupied area and the supply airflow rate. In conclusion, the lower the supply airflow and the higher the lighting power density, the more the thermal comfort of the indoor environment could be improved by using UFAD instead of CBAD. In the lighting power density range of 0–30 W/m2, correlations were calculated whereby the lighting power density levels could be predicted that would ensure thermal comfort at a desired level. View Full-Text
Keywords: ceiling-based air distribution system (CBAD); under-floor air distribution system (UFAD); thermal comfort; predicted mean vote (PMV); cooling load of artificial lighting ceiling-based air distribution system (CBAD); under-floor air distribution system (UFAD); thermal comfort; predicted mean vote (PMV); cooling load of artificial lighting
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Yu, K.-H.; Yoon, S.-H.; Jung, H.-K.; Kim, K.H.; Song, K.-D. Influence of Lighting Loads upon Thermal Comfort under CBAD and UFAD Systems. Energies 2015, 8, 6079-6097.

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