Compressible Flow Through Solar Power Plant Chimneys
Author:
von Backstro¨m Theodor W.1, Gannon Anthony J.1
Affiliation:
1. Department of Mechanical Engineering, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa
Abstract
Chimneys as tall as 1500 m may be important components of proposed solar chimney power plants. The exit air density will then be appreciably lower than the inlet density. The paper presents a one-dimensional compressible flow approach for the calculation of all the thermodynamic variables as dependent on chimney height, wall friction, additional losses, internal drag and area change. The method gives reasonable answers even over a single 1500 m step length used for illustration, but better accuracy is possible with multiple steps. It is also applicable to the rest of the plant where heat transfer and shaft work may be present. It turns out that the pressure drop associated with the vertical acceleration of the air is about three times the pressure drop associated with wall friction. But flaring the chimney by 14 percent to keep the through-flow Mach number constant virtually eliminates the vertical acceleration pressure drop. [S0199-6231(00)03003-3]
Publisher
ASME International
Subject
Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment
Reference7 articles.
1. Haaf, W., Friedrich, K., Mayr, G., and Schlaich, J., 1983, “Solar Chimneys: Part I: Principle and Construction of the Pilot Plant in Manzanares,” Int. J. Solar Energy, 2, No. 1, pp. 3–20. 2. Haaf, W.
, 1984, “Solar Chimneys: Part II: Preliminary Test Results from the Manzanares Pilot Plant,” Int. J. Solar Energy, 2, No. 2, pp. 141–161. 3. Von Backstro¨m, T. W., and Gannon, A. J., 2000, “The Solar Chimney Air Standard Cycle,” South Afr. Inst. Mech. Eng. R&D J., 16, pp. 16–24. 4. Gannon, A. J., and Von Backstro¨m, T. W., 2000, Solar Chimney Cycle Analysis Including Losses and Solar Collector Performance, Proceedings of Solar 2000, Madison, Wisconsin, June 2000. 5. Zucrow, M. J., and Hoffman J. D., Gas Dynamics, Wiley, New York, 1976.
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