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COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Analysis of a solar chimney with double inlet by means of venturi effect
Submission Author:
Cyro Albuquerque Neto , SP , Brazil
Co-Authors:
Thales De Freitas Villas Bôas, Felipe Person Malta, Cyro Albuquerque Neto
Presenter: Felipe Person Malta
doi://10.26678/ABCM.COBEM2017.COB17-1610
Abstract
Solar chimneys can induce ventilation, and therefore, it can be implemented into the walls of a building in order to enhance thermal comfort. In a conventional solar chimney, only the bottom part of the room is ventilated while the top portion remains with a substantial thermal load. In this paper, the authors proceed with the analysis on how to remove air from both portions of the environment and still improving chimney’s overall performance. This was achieved in a previous work by obstructing the chimney’s cross section at a determined height, in which the top inlet is mounted, thus producing a similar effect of a venturi. The results indicated that the use of both inlets have other several benefits over the conventional layout, not only ventilating both portions of the room and improving overall performance, but it was also noticed that having an obstruction plate as venturi brought controllability to the flow. Through the new experiments it became clear that the chimney with a larger gap-to-height ratio induced a greater ventilation, mainly due to the increased area without a significant loss of average velocity. Finally, it was found that an obstructing gap between 1/5 and 3/5 of the full chimney’s gap is optimal and preferable.
Keywords
thermal comfort, Solar Chimney, Solar Energy, Natural Convection
