Entropy production analysis and experimental confirmation of absorption systems |
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Authors: | H.T Chua J.M Gordon K.C Ng Q Han |
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Affiliation: | aDepartment of Mechanical and Production Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260;bCenter for Energy and Environmental Physics, Jacob Blaustein Institute for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus 84990, Israel;cThe Pearlstone Center for Aeronautical Engineering Studies, Department of Mechanical Engineering, Ben-Gurion University of the Negev, Beersheva 84105, Israel |
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Abstract: | Absorption chillers, heat pumps and heat transformers exploit thermal power input to satisfy a variety of refrigeration and heating applications, as well as to boost the temperature of low-grade heat. Can one arrive at accurate predictions of system performance with a simple analytic irreversible thermodynamic model? In capturing the essential physics of the problem, that model would be required to provide a predictive and diagnostic tool and to permit determination of optimal absorption system operating conditions. We derive such a model and check its validity against experimental data and computer simulation results from a variety of commercial absorption units. We reinforce the observation that commercial units appear to have evolved empirically such that maximum efficiency is realized under design conditions. The failure of a host of previously-published endo-reversible thermodynamic models to account for fundamental qualitative features and accurate predictions of system behavior is documented with computer simulation results and experimental performance data. |
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Keywords: | refrigerating system absorption heat pump heat transformer performance simulation calculation thermodynamics |
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