Investigation into the application of a solar-assisted air-conditioning system under different weather conditions

Pao Yue-kong Library Electronic Theses Database

Investigation into the application of a solar-assisted air-conditioning system under different weather conditions

 

Author: Gong, Yixin
Title: Investigation into the application of a solar-assisted air-conditioning system under different weather conditions
Degree: M.Eng.
Year: 2014
Subject: Solar air conditioning
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Building Services Engineering
Pages: xii, 114 leaves : illustrations ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2760609
URI: http://theses.lib.polyu.edu.hk/handle/200/7632
Abstract: In the hot and humid climate regions like Hong Kong, Singapore and Shanghai, conventional air-conditioning (AC) systems control the temperature and the humidity of the supply air simultaneously, operating inefficiently due to the over-cooling and re-heating processes. Handling the latent load separately by using liquid desiccant is a promising way to reduce the energy use from the AC system. Firstly, the patterns and differences of air conditioning load profile of a hotel building in Hong Kong, Shanghai and Singapore were studied. Secondly, composed latent cooling load parts were investigated. The detailed mathematical models on the solar hybrid liquid desiccant cooling system (SHLDCS) components were integrated to form a C programme to compare the energy performance of the conventional vapor compressor AC System with the SHLDCS. One building model of a hotel was developed by the Designbuilder in this study and Energyplus was employed to gain the cooling load profiles. To understand the performance of the proposed system, computer simulation was performed. Mass and energy balance equations of different components were integrated in the simulation porgramme. In order to develop the energy saving potential of the proposed system, two types of improved measures, i.e. a configuration optimization measure and a control optimization measure, were also evaluated. The adoption of the measures was mainly based on its energy performance and operational performance. Simulation results found that the major latent cooling load source is from the outdoor air. Moreover, on the basis of latent cooling load distribution characteristic all the year round, the system operation duration for Hong Kong , Shanghai and Singapore were April to October, June to August and a whole year. System simulation results show that the dehumidification capacity of the basic SHLDCS (base case) shows enormous energy-saving potential in Hong Kong, Shanghai and Singapore compared with vapor compression (VC) system, realizing 46.1%, 49.2% and 39.3% of energy saved in Hong Kong, Singapore and Shanghai. The system with control optimization enhanced the operational performance but caused the increase of energy. The configuration optimization failed to further save energy and enhance operational performance.

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