The objective of this paper is to provide optimization of falling film LiBr solution on a horizontal single tube based on minimization of entropy generation. Flow regime is considered to be laminar. The effect of boiling has been ignored and wall temperature is constant. Velocity, temperature and concentration distributions are numerically determined and dimensionless correlations are obtained to predict the average heat transfer coefficient and average evaporation factor on the horizontal tube. Thermodynamic imperfection due to passing lithium bromide solution is attributed to nonisothermal heat transfer; fluid flow friction and mass transfer irreversibility. Scale analysis shows that the momentum and mass transfer irreversibilities can be ignored at the expense of heat transfer irreversibility. In the process of optimization, for a specified evaporation heat flux, the entropy generation accompanying the developed dimensionless heat and mass transfer correlations has been minimized and the optimal geometry and the optimum thermal hydraulic parameters are revealed. The investigation cited here indicates the promise of entropy generation minimization as an efficient design and optimization tool.
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Second Law Based Optimization of Falling Film Single Tube Absorption Generator
S. Jani,
S. Jani
Center of Excellence in Energy Conversion, School of Mechanical Engineering, Sharif University of Technology, Tehran, Iran, P.O. Box. 11365-9567
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M. H. Saidi,
M. H. Saidi
Center of Excellence in Energy Conversion, School of Mechanical Engineering, Sharif University of Technology, Tehran, Iran, P.O. Box. 11365-9567
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A. A. Mozaffari
A. A. Mozaffari
Center of Excellence in Energy Conversion, School of Mechanical Engineering, Sharif University of Technology, Tehran, Iran, P.O. Box. 11365-9567
Search for other works by this author on:
S. Jani
Center of Excellence in Energy Conversion, School of Mechanical Engineering, Sharif University of Technology, Tehran, Iran, P.O. Box. 11365-9567
M. H. Saidi
Center of Excellence in Energy Conversion, School of Mechanical Engineering, Sharif University of Technology, Tehran, Iran, P.O. Box. 11365-9567
A. A. Mozaffari
Center of Excellence in Energy Conversion, School of Mechanical Engineering, Sharif University of Technology, Tehran, Iran, P.O. Box. 11365-9567
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division September 11, 2002; revision received November 25, 2003. Associate Editor: V. P. Carey.
J. Heat Transfer. Oct 2004, 126(5): 708-712 (5 pages)
Published Online: November 16, 2004
Article history
Received:
September 11, 2002
Revised:
November 25, 2003
Online:
November 16, 2004
Citation
Jani , S., Saidi , M. H., and Mozaffari, A. A. (November 16, 2004). "Second Law Based Optimization of Falling Film Single Tube Absorption Generator ." ASME. J. Heat Transfer. October 2004; 126(5): 708–712. https://doi.org/10.1115/1.1795791
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