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Cairo University (2014)

The Impact of Different Roof Forms on Indoor Thermal Performance in Low Rise Residential Buildings with Reference to Western Desert Zone "Egypt”

Safie El-din Ahmed Hassan Fouly

Titre : The Impact of Different Roof Forms on Indoor Thermal Performance in Low Rise Residential Buildings with Reference to Western Desert Zone "Egypt”

Auteur : Safie El-din Ahmed Hassan Fouly

Etablissement de soutenance : Cairo University

Grade : Master of Science (MS) 2014

Résumé
The thermal performance of a building is affected by the solar absorptivity through building envelope, which consists of wall, window, and roof. Especially the roof which has the highest heat gain among the building envelope components compared to the area. The history of finding the most adequate roof form and its integration with various passive techniques was significant in climatic responsive architecture, in order to enhance thermal comfort conditions in living space and at the same time to reduce both the embodied and operational energy consumption, which firstly applied in vernacular buildings in using the vault and dome forms in order to minimize the direct solar heat gain, or using the concaved roofs like in Igloo form to preserve the heat inside, achieve bioclimatism that integrates the micro-climate and architecture to human thermal comfort conditions. Maintaining satisfactory thermal comfort conditions for the occupants in residential buildings is the main concern as a small increase in the indoor thermal comfort is much more substantial than cost savings from utilities and maintenance. With reference to international ASHRAE standard 55-2004, Thermal comfort relates human sensation, perception with a number of environmental and physical parameters ; these environmental and physical parameters are affected directly by direct heat gain through building envelope especially the roof. Studying and applying thermal comfort variables on the case study which will be the Western desert in Egypt in order to detect the constants and variables like operative temperature range. Thermal analysis simulations on a generic residential building model in order to test different roof formations that are popular in arid zone, by using DesignBuilder program will be performed with reference to western desert climate region settings in summer months in Egypt, with respect to the roof form guidelines and principles from the theoretical part in order to analyze the impact of different roof forms on its direct heat gain and its relation with indoor thermal environment and the thermal comfort variables for the occupants in low rise residential buildings, taking in consideration the constrains and variables like study area, variables of measuring and thermal comfort parameters, these constrains, etc. The variables will be applied and tested on certain procedures, results and findings will be discussed in order to detect design guidelines for roof form to minimize direct heat gain and sustain the occupants’ human comfor

Mots Clés : Roof form, Thermal roof profile, Direct heat gain, Passive techniques, Indoor thermal environment, Thermal comfort, Residential buildings, Western desert, Computer thermal simulation, Designbuilder

Présentation

Page publiée le 18 avril 2020