Investigation of energy performance and optimal control of variable primary flow system

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Investigation of energy performance and optimal control of variable primary flow system

 

Author: Guan, Jing
Title: Investigation of energy performance and optimal control of variable primary flow system
Degree: M.Eng.
Year: 2012
Subject: Air conditioning -- Energy consumption.
Air conditioning -- Equipment and supplies -- Energy consumption.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Building Services Engineering
Pages: 110 leaves : ill. ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2551449
URI: http://theses.lib.polyu.edu.hk/handle/200/6926
Abstract: This dissertation presents an investigation of the energy performance of variable primary flow system comparing with other types of systems in building air-conditioning systems. Optimal control strategies are studied to enhance the energy efficiency of variable primary flow system. Through a detailed analysis of the system characteristics, the pressure drop models for different water networks in air-conditioning systems are developed and then used to formulate an optimal pump control strategy. This control strategy determines the optimal variable speed frequency of pumps in operation by taking into account their power consumptions and maintenance costs. The pressure differential set-point for pumps control is reset using the online opening signals of water control valves at terminals. The performances of these strategies are tested and evaluated in a simulated module with the complex air-conditioning system in super high-rise hotel by comparing with that of other reference strategies. Both analysis - theoretical analysis and simulation study are used in investigation. The results of research have reference and values for practical application for further energy efficient analysis in chilled water system.

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