Optimization of a solar driven absorption refrigerator in the transient regime

► Dynamic behavior of a solar absorption refrigerator endoreversible model. ► Using the principles of classical thermodynamics, mass and heat transfers. ► Minimizing heat exchange time to reach maximum performances. ► Major influence of the collector temperature on the model’s characteristics. ► Ana...

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Bibliographic Details
Published in:Applied energy 2012-04, Vol.92, p.714-724
Main Authors: Hamed, Mouna, Fellah, Ali, Ben Brahim, Ammar
Format: Article
Language:English
Subjects:
Absorption
Applied sciences
cold
Endoreversible
Energy
Exact sciences and technology
functional properties
heat transfer
mathematical models
Optimization
Refrigeration
refrigerators
solar collectors
solar energy
temperature
thermal conductivity
Transient regime
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Summary:► Dynamic behavior of a solar absorption refrigerator endoreversible model. ► Using the principles of classical thermodynamics, mass and heat transfers. ► Minimizing heat exchange time to reach maximum performances. ► Major influence of the collector temperature on the model’s characteristics. ► Analogous effects of both the thermal load and the thermal conductance. This contribution deals with the theoretical study in dynamic mode of an absorption refrigerator endoreversible model. The system is a cold generating station driven by solar energy. The main elements of the cycle are a refrigerated space, an absorption refrigerator and a solar collector form. A mathematical model is developed. It combines the classical thermodynamics and mass and heat transfers principles. The numerical simulation is made for different operating and conceptual conditions. A global minimizing time optimization is performed in view to reach maximum performances. Appropriate dimensionless groups are defined. The results are presented in normalized charts for general applications. The collector temperature presents major influence on the conceptual and functional characteristics compared to the stagnation temperature influence. On the other hand the thermal load in the refrigerated space and the thermal conductance of the walls has analogous effects, therefore important to be considered in actual design. As a result, the model is expected to be a useful tool for simulation, design, and optimization of solar collector based energy systems.
ISSN:0306-2619
1872-9118
DOI:10.1016/j.apenergy.2011.08.012