Author: Chen, Zeyi
Title: Optimizing extra-low temperature DX system
Degree: M.Eng.
Year: 2017
Subject: Hong Kong Polytechnic University -- Dissertations
Air conditioning
Air conditioning -- Design and construction
Department: Department of Building Services Engineering
Pages: viii, 76 pages : color illustrations
Language: English
Abstract: The proposal of the extra-low temperature dedicated outdoor air system (XT-DOAS) could make fully use of the advantages of the dedicated outdoor air system (DOAS) as well as make it better applicable in the hot and humid area like Hong Kong, which could avoid the issues of the conventional air-conditioning (AC) system. This study is to optimize the XT-DOAS so as to have the best energy and thermal comfortable performance by the employment of the EnergyPlus simulation investigations. The simulations were carried out based on two equipment performance data from a pilot study and the manufacturer, and a realistic building and corresponding system characteristics. In order to optimize the system, three key variables of the system were focused, the supply air temperature (TSA), the treated outdoor air temperature (TOA) and the number of stages. It can be concluded that the optimal system configuration and setting were TOA 8°C, TSA 18°C and 2-stage which could have a relative desirable performance for both energy saving and thermal satisfaction.
Access: restricted access

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