A simulation study on reducing total nighttime cooling load in a subtropical bedroom by applying phase change material (PCM)/vacuum insulation panel (VIP) coupling system in the building envelopes

Pao Yue-kong Library Electronic Theses Database

A simulation study on reducing total nighttime cooling load in a subtropical bedroom by applying phase change material (PCM)/vacuum insulation panel (VIP) coupling system in the building envelopes

 

Author: Fang, Guanyu
Title: A simulation study on reducing total nighttime cooling load in a subtropical bedroom by applying phase change material (PCM)/vacuum insulation panel (VIP) coupling system in the building envelopes
Degree: M.Eng.
Year: 2016
Subject: Air conditioning -- Efficiency.
Cooling load -- Measurement.
Buildings -- Environmental aspects.
Buildings -- Energy conservation.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Building Services Engineering
Pages: 65 pages : color illustrations
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2917143
URI: http://theses.lib.polyu.edu.hk/handle/200/8623
Abstract: In the subtropical regions, air conditioning (A/C) for a bedroom in residential buildings commonly served to provide an appropriate indoor thermal environment at nighttime for sleeping during daytime when A/C was not provided, a large amount of thermal energy can be stored in the thermal mass in its envelope components, in particularly its external walls. The energy stored would be gradually released, contributing significantly to the total space cooling load in the bedroom at nighttime. Therefore, this dissertation takes a simulation study on further analysing the nighttime cooling load characteristics in a hypothetic west-facing bedroom in subtropical Hong Kong and on the effects of adding VIP (vacuum insulation panel) and PCM (phase change material) coupling system to the west-facing external wall in the bedroom on reducing the thermal energy stored in the wall and consequently the nighttime cooling load. The application of VIP/PCM coupling system in the building envelop can significantly reduce the total cooling load from the building envelope, and a reduction of 45.27% has obtained. Besides the effect on cooling load, the variation of the indoor temperature is also reduced. The software EnergyPlus is introduced to as the simulation tool. In order to optimize material selection, the following experiments have taken to discuss the effects of the properties of the materials, such as melting temperature, thickness. Besides that, the thesis attempts to explain the reasons for the drop of total cooling load.

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