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University of Sheffield (1987)

An investigation into the ventilation and thermal performance of contemporary housing in North Africa, with special reference to Libya

Gadi, M.B

Titre : An investigation into the ventilation and thermal performance of contemporary housing in North Africa, with special reference to Libya

Auteur : Gadi, M.B

Université de soutenance : University of Sheffield

Grade : M.Phil. 1987

Résumé
At the start of the present work it was found necessary to describe and discuss the design concepts and structural details of the old and new houses. This discussion emphasized, in general, the poor performance of the new house with respect to the local climate. The climate was anal_sed and the conclusion was that where most of the population live, ventilation is an important factor for achieving indoor comfort. Across the rest of the region, the building mass is more important. The review of the available techniques for predicting ventilation rates through buildings was carried out from which scale modelling was found to be the best. The wind tunnel investigation began with the experimental set up and then conducting a series of tests on two models. Firstly with a simple model to study the effects on airflow produced by some of the typical elements in the new house. Secondly with a more detailed model for the whole house to predict the air flow forms and rates according to the usual daily patterns of occupancy. From these stages, new mathematical relationships for the calculation of internal pressure coefficients were derived. Figures for estimating air change rates through the building are given. After this step by employing the predicted air change rates, it was possible to simulate the thermal performance of the building under two typical structures and in two locations. From this simulation, a simplified approach for predicting indoor temperatures at the preliminary design stage, was suggested. Later on, a comparison with other work was made in which an agreement was found in some of the results obtained. In this comparison, one of the latest passive control systems is discussed and recommended. Also, for promoting natural ventilation through the building under various conditions, a different passive system is proposed which came as a result of the present work and considered as a further stage of research to be commenced by the author in the near future. Finally due to the large number of conclusions derived from this study, it was thought more practical to give these conclusions at the end of each stage so that the reader can easily refer to any figure or explanation for further details

Accès au document : Proquest Dissertations & Theses

Page publiée le 19 février 2015, mise à jour le 22 octobre 2018