Exergy and energy analysis of conventional air conditioning system and dedicated outdoor air system in the different characteristics of building cooling load

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Exergy and energy analysis of conventional air conditioning system and dedicated outdoor air system in the different characteristics of building cooling load

 

Author: Jin, Han
Title: Exergy and energy analysis of conventional air conditioning system and dedicated outdoor air system in the different characteristics of building cooling load
Degree: M.Eng.
Year: 2016
Subject: Air conditioning -- Efficiency.
Air conditioning -- Energy conservation.
Air conditioning -- Energy consumption.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Building Services Engineering
Pages: x, 72 pages : color illustrations
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2917162
URI: http://theses.lib.polyu.edu.hk/handle/200/8669
Abstract: With the enhancement of living standards, air-conditioning system has widely been applied to modern buildings. Energy use in residential and commercial buildings accounts for up to 40% of primary energy consumption depending on climate region, and of that fraction, 40-60% is used on space air conditioning. The air-conditioning scheme with dedicated outdoor air system (DOAS) is widely believed to be able to improve indoor thermal comfort and indoor air quality. In terms of some different real cases, the energy consumption of DOAS and conventional air conditioning system is quite different. Key parameters for dedicated outdoor air system that impact energy use are determined by many factors. Such as total cooling load, space sensible and latent cooling load, outdoor air conditions, design indoor air state, etc. Therefore, this dissertation adopted dimensionless parameters analysis method to compare the energy performance of dedicated outdoor air system and conventional air conditioning system (primary return air system) in the different characteristics of building cooling load in order to provide some useful empirical energy consumption data and formula for actual engineering. Based on literature review, the cooling energy performance of primary return air system and dedicated outdoor air system integrated dry fan-coil unit is investigated in Hong Kong. Due to the complicated calculation of cooling coil, the design and operation calculation of cooling coil are supported by computation program from the platform of Visual C. In addition, the two exergy efficiency of primary return air system in peak cooling load cases are also studied in order to illustrate the differences between simple exergy efficiency and rational exergy efficiency.

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