Natural Convection and Conduction in Massive Wall Solar Collectors With Honeycomb and Without Vents

[+] Author and Article Information
E. K. Lakhal

Semlalia, B. P. S-15, Marrakesh, Morocco

E. Bilgen, P. Vasseur

Ecole Polytechnique, Box 6079, City Center, Montreal, PQ H3C 3A7, Canada

J. Sol. Energy Eng 117(3), 173-180 (Aug 01, 1995) (8 pages) doi:10.1115/1.2847766 History: Received May 01, 1994; Revised February 01, 1995; Online February 14, 2008


Steady heat transfer by natural convection and conduction is numerically studied in passive solar collector systems consisting of a massive wall with honeycomb structure and without vents. The boundary conditions are constant heat flux on the wall and fins, isothermal on the vertical bounding sides, and adiabatic on the horizontal sides. The governing parameters are the Rayleigh number (106 ≤ Ra ≤ 5 × 109 ), the aspect ratio of the enclosures (0.4 ≤ A = H ′/L ′ ≤ 1.4), the dimensionless lengths of the fins (0 ≤ B = l ′/L l ′ ≤ 1), the aspect ratio of the microcavities (0.05 ≤ C = h ′/L ′ ≤ 1), the wall thickness (0.008 ≤ w = w ′/L ′ ≤ 0.033). The fin thickness (e = e ′/H ′ = 0.06) and the Prandtl number (Pr = 0.72) were constant, and the conductivity ratio was variable (10−4 ≤ k r ≤ 5 × 106 ). Local and average Nusselt numbers along the long sides are calculated as a function of various parameters. Streamlines and isotherms are produced. Effects of various parameters on the heat transfer are examined and heat transfer correlations are derived.

Copyright © 1995 by The American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.





Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In