A study of using economizer cycle in Hong Kong commercial buildings by energy simulation

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A study of using economizer cycle in Hong Kong commercial buildings by energy simulation


Author: Wong, Yiu-wa Franki
Title: A study of using economizer cycle in Hong Kong commercial buildings by energy simulation
Year: 1999
Subject: Commercial buildings -- Energy conservation -- China -- Hong Kong
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Building Services Engineering
Pages: x, 134 leaves : ill. (some col.) ; 31 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1471898
URI: http://theses.lib.polyu.edu.hk/handle/200/235
Abstract: Many commercial buildings located in temperate climate require cooling all year, and air economizer is usually installed in order to reduce energy consumption (Ventresca, 1995). However, in humid climate areas like Hong Kong an air economizer control is seldom applied. A simulation study on the energy saving potentials of using an air economizer for HVAC system in Hong Kong is presented here by adopting Carrier E20-II Hourly Analysis Program (HAP). Three types of outdoor air economizer control strategies - (1) Integrated Enthalpy Control, (2) Integrated Dry-Bulb Control, and (3) Non-Integrated Dry-Bulb Control have been examined. On the other hand, the feasibility of using an air economizer and energy impact in different outdoor weather conditions for HVAC system application in Hong Kong have been critically analyzed. According to the results, Integrated Enthalpy Control and Non-Integrated Dry-Bulb Control would save 11% and 1.5% annual cooling energy respectively. There are potential for achieving optimum energy savings in the period from November to March. On the contrary, Integrated Dry-Bulb Control consumes more energy. Moreover, only using 8760 hours method could obtain the reasonable simulation result. It is hoped that the methodology can be practiced by designers to assess an air economizer control in projects design.

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