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Analysis of a Solar Updraft Tower Utilizing Compost Waste Heat

[+] Author Affiliations
Kevin R. Anderson, Maryam Shafahi, Chris McNamara, Wesley Schroeder, David Owen, Ivan Castillo

Cal Poly Pomona, Pomona, CA

Paper No. POWER2015-49114, pp. V001T11A003; 10 pages
  • ASME 2015 Power Conference collocated with the ASME 2015 9th International Conference on Energy Sustainability, the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2015 Nuclear Forum
  • ASME 2015 Power Conference
  • San Diego, California, USA, June 28–July 2, 2015
  • Conference Sponsors: Power Division
  • ISBN: 978-0-7918-5660-4
  • Copyright © 2015 by ASME


This paper presents the results for a feasibility study of a solar chimney which uses low-grade waste heat from compost in conjunction with solar energy transmitted via a transparent roof top. The feasibility study shows that the solar chimney’s turbine power increases with pressure ratio, the height of the chimney as well as the differential temperature in the chamber. This paper also outlines the thermodynamic modeling related to using waste heat from composting to increase the air temperature in the inlet chamber of a solar chimney. It is found that from this analysis that the average temperature in the chamber increases as a function of the chimney inlet chamber axial length. For a chimney 1150 ft (350 m) high and 24 ft (7.3 m) in diameter processing 8000 tons of composting material it is found that a power output of 38 kW can be harnessed at the turbine.

Copyright © 2015 by ASME



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