Performance assessment and optimization of the chilled water distribution system in International Commerce Centre (ICC)

Pao Yue-kong Library Electronic Theses Database

Performance assessment and optimization of the chilled water distribution system in International Commerce Centre (ICC)

 

Author: Gao, Yunhai
Title: Performance assessment and optimization of the chilled water distribution system in International Commerce Centre (ICC)
Degree: M.Eng.
Year: 2015
Subject: Buildings -- Cooling.
Buildings -- Energy conservation
Tall buildings -- Air conditioning.
Refrigeration and refrigerating machinery
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Building Services Engineering
Pages: x, 70 pages : color illustrations
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2826137
URI: http://theses.lib.polyu.edu.hk/handle/200/8229
Abstract: Energy crisis is an important issue getting more and more attention. For high-rise buildings (e.g. the ICC building), the chilled water distribution (CWD) system accounts about 30% of the energy consumption in the HVAC system of ICC. The aim of this study is to enhance the operational performances of the chilled water distribution systems of ICC. This research focuses on assessing the energy performance of the CWD system and making optimization by proposing proper solutions that mainly by developing fault diagnosis and robust control strategies on the chillers, heat exchangers and distributing pumps etc. The proposed strategies were developed based on the actual chilling system in ICC and were tested and validated on a dynamic simulation platform. As a result, the low delta-T syndrome (LDT) was analyzed. The strategies including the optimal temperature set-point and optimal differential pressure set-point were tested and recommended to help enhance the energy efficiency of the CWD system, which can achieve more than 10% of energy consumption saving. This research included two main contributions. One was the energy performance assessment of the chilled water distribution system in ICC, including cooling load comparison, WTF comparison and LDT analysis. The other was test and employment of the optimal control strategies for the primary-secondary chilled water systems.

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