Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/67375
Title: Applying a novel extra-low temperature dedicated outdoor air system for humidity control and energy efficiency
Authors: Bao, YN
Lee, WL 
Jia, J
Issue Date: 2017
Publisher: Taylor & Francis
Source: Science and technology for the built environment, 2017, v. 23, no. 1, p. 16-29 How to cite?
Journal: Science and technology for the built environment 
Abstract: A novel dedicated outdoor air system consisting of a multi-stage direct expansion coil to generate extra-low temperature outdoor air to avoid moisture-related problems and for desirable air conditions and better energy efficiency is proposed for investigation. In this study, the proposed system's (extra-low temperature-dedicated outdoor air system) performance in achieving the desirable air conditions and better energy efficiency objectives is compared with a conventional direct expansion coil system with variable speed compressor and fan used for air conditioning of a typical office building in Hong Kong. Through hour-by-hour simulations, using equipment performance data of a pilot study and realistic building and system characteristics, it was found that the extra-low temperature-dedicated outdoor air system, as compared to the conventional system, could reduce the annual air-conditioning energy consumption by 22.6%, the indoor discomfort hours by 31% and the condensation risk to zero hours. Root-mean-square error and standard deviation analysis of the resultant relative humidity confirmed that the extra-low temperature-dedicated outdoor air system could better achieve the desired relative humidity. The findings of this study confirm that the extra-low temperature-dedicated outdoor air system is better than the conventional system in terms of both energy consumption and the desirable air conditions when used in office buildings in Hong Kong.
URI: http://hdl.handle.net/10397/67375
ISSN: 2374-4731
EISSN: 2374-474X
DOI: 10.1080/23744731.2016.1203713
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