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Effect of irreversibilities on performance of an absorption heat transformer used to increase solar pond’s temperature

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  • Sözen, Adnan

Abstract

Absorption thermal systems are attractive for using waste heat energy from industrial processes and renewable energy such as geothermal energy, solar energy, etc. The Absorption Heat Transformer (AHT) is a promising system for recovering low-level waste heat. The thermal processes in the absorption system release a large amount of heat to the environment. This heat is evolved considerably at temperature, the ambient temperature results in a major irreversible loss in the absorption system components. Exergy analysis emphasises that both losses and irreversibility have an impact on system performance. Therefore, evaluating of the AHT in exergy basis is a much more suitable approach. In this study, a mathematical model of AHTs operating with the aqua/ammonia was developed to simulate the performance of these systems coupled to a solar pond in order to increase the temperature of the useful heat produced by solar ponds. A heat source at temperatures not higher than 100 °C was used to simulate the heat input to an AHT from a solar pond. In this paper, exergy analysis of the AHT were performed and effects of exergy losses of the system components on performance of the AHT used to increase solar pond’s temperature were investigated. The maximum upgrading of solar pond’s temperature by the AHT, is obtained at 51.5 °C and gross temperature lift at 93.5 °C with coefficients of performance of about 0.4. The maximum temperature of the useful heat produced by the AHT was ~150 °C. As a result, determining of exergy losses for the system components show that the absorber and the generator need to be improved thermally. If the exergy losses are reduced, use of the AHT to increase the temperature of the heat used from solar ponds will be more feasable.

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  • Sözen, Adnan, 2004. "Effect of irreversibilities on performance of an absorption heat transformer used to increase solar pond’s temperature," Renewable Energy, Elsevier, vol. 29(4), pages 501-515.
    • Handle: RePEc:eee:renene:v:29:y:2004:i:4:p:501-515
    DOI: 10.1016/j.renene.2003.09.004
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    References listed on IDEAS

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    1. Ravikumar, T.S. & Suganthi, L. & Samuel, Anand A., 1998. "Exergy analysis of solar assisted double effect absorption refrigeration system," Renewable Energy, Elsevier, vol. 14(1), pages 55-59.
    2. Shi, Lin & Yin, Juan & Wang, Xin & Zhu, Ming-Shan, 2001. "Study on a new ejection-absorption heat transformer," Applied Energy, Elsevier, vol. 68(2), pages 161-171, February.
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    1. Colorado, D. & Hernández, J.A. & Rivera, W. & Martínez, H. & Juárez, D., 2011. "Optimal operation conditions for a single-stage heat transformer by means of an artificial neural network inverse," Applied Energy, Elsevier, vol. 88(4), pages 1281-1290, April.
    2. Rivera, W. & Huicochea, A. & Martínez, H. & Siqueiros, J. & Juárez, D. & Cadenas, E., 2011. "Exergy analysis of an experimental heat transformer for water purification," Energy, Elsevier, vol. 36(1), pages 320-327.

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