Journal of Heat Transfer

Volume: Page/CID:

Non-Darcy Mixed Convection With Thermal Dispersion in a Saturated Porous Medium
Thermal dispersion due to local flows is significant in heat transfer with forced convection in porous media. The effects of parametrized melting (M), thermal dispersion (D), inertia (F), and mixed co...

Buoyant Convection in Superposed Metal Foam and Water Layers
Heat transfer measurements for natural convection in superposed metal foam and water layers are reported. Two systems heated at the lower boundary are considered: a water-filled cavity with a foam lay...

J. Heat Transfer / Volume 132 / Issue 1 / Technical Briefs

Initial Buoyancy Reduction in Exhausting Smoke With Solar Chimney Design

J. Heat Transfer -- January 2010 -- Volume 132, Issue 1, 014502 (3 pages)
doi:10.1115/1.3211860

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ABSTRACT

REFERENCES (7)

Author(s):
C. L. Chow
Department of Architecture, Wolfson College, University of Cambridge, Cambridge, UK

W. K. Chow
Department of Building Services Engineering, Research Centre for Fire Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China

Apossible problem in using solar chimney as a natural smokeexhaust system will be identified in this paper. Smoke generatedin a fire might not be removed effectively if theglazing walls are heated up due to exposure to solarradiation. It is because the buoyancy of the smoke isreduced initially in the solar chimney. This phenomenon of reducingbuoyancy will be discussed. A simple equation of motion onsmoke movement was set up. Some of the results offull-scale burning experiments carried out earlier for assessing the fireresponse of a glass façade system were applied to supportthe argument. Experiments indicated that smoke would take a longertime to move up when the glazing wall temperature ishigher. A better smoke exhaust design accounting the reduction inbuoyancy at this early stage of a fire should beworked out.