Comparative study of energy consumption and indoor thermal comfort of traditional air-conditioning systems and DOAS-integrated systems

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Comparative study of energy consumption and indoor thermal comfort of traditional air-conditioning systems and DOAS-integrated systems

 

Author: Wu, Yongle
Title: Comparative study of energy consumption and indoor thermal comfort of traditional air-conditioning systems and DOAS-integrated systems
Degree: M.Eng.
Year: 2009
Subject: Hong Kong Polytechnic University -- Dissertations.
Buildings -- Energy conservation.
Energy consumption.
Indoor air quality.
Air conditioning.
Department: Dept. of Building Services Engineering
Pages: vi, 73 leaves : ill. (some col.) ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2303481
URI: http://theses.lib.polyu.edu.hk/handle/200/4356
Abstract: Conventional air conditioning systems are facing great challenges in aspects of indoor relative humidity (RH) control, system safety and effective outdoor air ventilation in an energy efficient way. The air conditioning scheme with dedicated outdoor air system (DOAS) is widely believed to be able to overcome these problems. A DOAS integrated with dry fan-coil units (FCU) system is introduced in this study. Energy efficiency and indoor thermal comfort of this air-conditioning scheme is investigated and compared with other two conventional air-conditioning systems, i.e. wet fan-coil unit systems and variable air volume (VAV) air conditioning systems. The three air-conditioning systems serve the same multi-zone space of a simulated office building in Hong Kong. Control strategies for the DOAS-integrated system are also presented. Tests on two typical operation conditions, i.e. summer day and spring day, are conducted on the simulation platform of TRNSYS. Simulation results show that the DOAS-integrated system can achieve the best indoor RH control on two typical days, and it consumes almost the same amount of energy as the wet FCU on summer day and about 5% more energy on spring day. In addition, the effect of total heat recovery exchanger on energy saving in hot and humid regions is demonstrated.

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