Simulation and evaluation of control strategies for air conditioning system using TRNSYS

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Simulation and evaluation of control strategies for air conditioning system using TRNSYS

 

Author: Chan, Ian Yee Tung
Title: Simulation and evaluation of control strategies for air conditioning system using TRNSYS
Degree: M.Eng.
Year: 2012
Subject: Commercial buildings -- Air conditioning.
Air conditioning -- Control -- Evaluation.
Air conditioning -- Efficiency.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Building Services Engineering
Pages: viii, 74 leaves : ill. (some col.) ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2525533
URI: http://theses.lib.polyu.edu.hk/handle/200/6637
Abstract: Centralized air conditioning systems are commonly found in large commercial buildings in Hong Kong. Besides proper design and sizing of the system components, an optimal control of the system provides great potential in reducing the energy consumption without compromising occupants' thermal comfort. Due to the complexity of a centralized cooling system, it is important to evaluate the overall performance of its control system through a holistic approach. This study focused on different control methods for the central cooling system, including the operation of cooling towers, pumps, and chillers. It aimed to implement various control strategies into a TRNSYS building simulation model and evaluate the system performance between the proposed and conventional control strategies. A new hotel building's central air-conditioning system design was used as a base reference for TRNSYS simulation model. Analysis of the results shows significant energy saving from various control strategies. Particularly, the proposed chiller sequence control strategy achieved energy saving up to 19%. Chilled water supply temperature optimization also indicates energy saving of around 4% per degree-centigrade rise in chilled water temperature setpoint. The findings from this study not only verify the energy saving potential from implementing proper control strategies, but also encourage further field study and applications.

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