7-11 July 2014
Africa/Johannesburg timezone
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Adaptation of roof ventilators as micro-power generation units in homes

Presented by Mr. Terrence MANYEREDZI on 8 Jul 2014 from 17:10 to 19:00
Type: Poster Presentation
Session: Poster1
Track: Track F - Applied Physics
Board #: F.437

Abstract

Ventilation is one of the aspects that determine quality of the indoor environment. Traditionally residential construction greatly relied on air infiltration through the building envelope. More ventilation than necessary is normally expensive in terms of energy. The incorporation of energy efficiency measures can drastically reduce energy consumption without compromising thermal performance of the building. In most cases the use of natural ventilation is not adequate so the need of mechanical ventilation. The incorporation of a power generation roof ventilator (PGRV) is a promising solution in meeting the energy needs and maintaining a thermally comfortable indoor environment. Literature shows that researchers do appreciate that power can be generated from a roof ventilator at negligible performance degradation in terms of ventilation. However, the researches fall short of detailing whether performance degradation is uniform for all modes of operation or it is a variable in itself thereby calling for intensive studies on characterising performance degradation of the roof ventilator. A voltage generator added to the rotating ventilator is an additional load to the rotating component that reduces its rotational capabilities. That reduction in rotational capability therefore translates to reduced ventilation efficiency since both power output and ventilation depend on the size of the centrifugal force on the ventilator. The paper gives a critical review of the work done to date by different researchers on power generator roof ventilators and identifies areas of research that need more attention.

Award

yes

Level

PhD

Supervisor

Dr. G. Makaka gmakaka@ufh.ac.za

Paper

yes

Place

Room: D Ring ground level


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