Simulation and control optimization of central cooling system in a large commercial building

Pao Yue-kong Library Electronic Theses Database

Simulation and control optimization of central cooling system in a large commercial building

 

Author: Li, Yiu-fai
Title: Simulation and control optimization of central cooling system in a large commercial building
Degree: M.Sc.
Year: 1995
Subject: Hongkong and Shanghai Banking Corporation
Air conditioning
Commercial buildings -- Air conditioning
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Pages: xvi, 90 leaves : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1205020
URI: http://theses.lib.polyu.edu.hk/handle/200/2845
Abstract: This MSc dissertation presents studies of simulation and control optimization of the central cooling system in the 46-storey HongkongBank Headquarters Building. The overall objectives of the project were to study the simulation of existing central cooling system on the basis of on-site monitoring, and then to evaluate operating strategies for the system. The on-site testing and measurements were performed to identify the actual operating performance of individual component of the system including the chiller, sea water pump, plate heat exchanger and secondary chilled water pump. Tests were conducted with the aid of the existing building management system, by which power consumption, water flow rate, temperature and pressure were monitored and logged for assessing the energy performance of the system components. The computer algorithms that were developed for the modeling of these components are described. TRNSYS (a computer program developed by the Solar Energy Laboratory at the University of Wisconsin-Madison) was used to link the individual models together in order to simulate the energy performance of the plant. The results of measured data and model predictions are presented and compared. Agreement between measured and predicted data is acceptable, verifying the reliability of the simulation software. The simulation software is suitable to apply to for similar central cooling systems, as it only requires a few parameters and operating conditions which may be varied according to the design and operational characteristics of the system. Control optimization methodologies of the central cooling system were formulated and simulated with the developed models, and their performance were evaluated based on the simulation results. Chiller sequencing, optimum sea water flow rate and optimum chilled water temperature difference are identified to be applicable for energy saving. In this study, it is shown that a significant energy consumption of the central cooling system can be saved using these control strategies, which can be incorporated into the computerized Building Management System (BMS). The energy montoring and system energy performance simulation study are useful tools to analyse the possibilities of energy saving and methods to optimize the system energy performance.

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