Thermodynamic Behaviour of the Solar Updraft Tower: A Parametric Model for System Sizing

Abstract:

The solar updraft tower (SUT) concept is an exciting renewable technology with the potential to deliver high power output. A comprehensive SUT sizing computer model has been developed to determine power output and thus appropriate system dimensions for different ambient conditions. The efficient thermodynamic model performs steady-state macro-scale simulations incorporating radiation and natural convection heat transfer mechanisms. The solar collector is simulated as a discretised, axisymmetric, radial system composed of thermal components. A set of linear simultaneous equations describes the heat exchanged between these components and is solved by matrix inversion. The short computation time of the model makes it ideal for parametric analysis of SUT plants across a range of dimensions. The thermodynamic performance of the collector proves to be a limiting factor of system power output. Results from the model show that for given chimney dimensions, there is a maximum collector size beyond which no further useful heat is added to the air as the system has reached thermal equilibrium. Therefore the only way to increase power output further is to increase chimney height and diameter as well as extending the collector diameter.

• Periodical: Applied Mechanics and Materials (Volume 283)
• Pages: 3-7
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.283.3
• Online since: January 2013
• Authors: Patrick Cottam, Philippe Duffour, Paul Fromme
• Keywords: Parametric Model, Solar Updraft Tower, Thermodynamic

References

[1] W. Haaf, K. Friedrich, G. Mayr, and J. Schlaich, Solar chimneys Part I: Principle and Construction of the Pilot Plant in Manzanares, International Journal of Solar Energy 2 (1983) 3–20.

DOI: 10.1080/01425918308909911

[2] W. Haaf, Solar Chimneys Part II: Preliminary Test Results from the Manzanares Pilot Plant, International Journal of Solar Energy 2 (1984) 141–161.

DOI: 10.1080/01425918408909921

[3] M.A. dos S. Bernardes, A. Voß, and G. Weinrebe, Thermal and technical analyses of solar chimneys, Solar Energy 75 (2003) 511–524.

DOI: 10.1016/j.solener.2003.09.012

[4] J.P. Pretorius and D.G. Kröger, Solar chimney power plant performance, Journal of Solar Energy Engineering 128 (2006) 302-311.

DOI: 10.1115/1.2210491

[5] A. Koonsrisuk and T. Chitsomboon, Dynamic similarity in solar chimney modeling, Solar Energy 81 (2007) 1439–1446.

DOI: 10.1016/j.solener.2007.03.003

[6] M.A. dos S. Bernardes, T. von Backström, and D. Kröger, Analysis of some available heat transfer coefficients applicable to solar chimney power plant collectors, Solar Energy, 83 (2009) 264–275.

DOI: 10.1016/j.solener.2008.07.019

[7] T.P. Fluri and T. von Backström, Comparison of modelling approaches and layouts for solar chimney turbines, Solar Energy 82 (2008) 239–246.

DOI: 10.1016/j.solener.2007.07.006

[8] J.P. Pretorius and D.G. Kröger, Thermoeconomic optimization of a solar chimney power plant, Journal of Solar Energy Engineering 130 (2008) 021015. 1-9.

DOI: 10.1115/1.2840571

[9] T.W. von Backström and T.P. Fluri, Maximum fluid power condition in solar chimney power plants - An Analytical Approach, Solar Energy 4 (2006) 1417 – 1423.

DOI: 10.1016/j.solener.2006.04.001

[10] J. Canada, Solar radiation prediction from sunshine in eastern Spain, Renewable Energy 2 (1992) 305–310.

DOI: 10.1016/0960-1481(92)90042-2

[11] X. Zhou, J. Yang, B. Xiao, and G. Hou, Simulation of a pilot solar chimney thermal power generating equipment, Renewable Energy 32 (2007) 1637–1644.

DOI: 10.1016/j.renene.2006.07.008