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Entropy 2017, 19(8), 416; doi:10.3390/e19080416

Thermal and Exergetic Analysis of the Goswami Cycle Integrated with Mid-Grade Heat Sources

1
Gama Power Systems, Beştepeler Mah. Nergis Sok. No:9 Kat:12, Söğütözü, 06520 Ankara, Turkey
2
School of Environment, Science and Engineering, Southern Cross University, Lismore, NSW 2480, Australia
3
Department of Energy, Universidad de la Costa, Barranquilla 080002, Colombia
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 26 July 2017 / Revised: 11 August 2017 / Accepted: 14 August 2017 / Published: 17 August 2017
(This article belongs to the Special Issue Work Availability and Exergy Analysis)
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Abstract

This paper presents a theoretical investigation of a combined Power and Cooling Cycle that employs an Ammonia-Water mixture. The cycle combines a Rankine and an absorption refrigeration cycle. The Goswami cycle can be used in a wide range of applications including recovering waste heat as a bottoming cycle or generating power from non-conventional sources like solar radiation or geothermal energy. A thermodynamic study of power and cooling co-generation is presented for heat source temperatures between 100 to 350 °C. A comprehensive analysis of the effect of several operation and configuration parameters, including the number of turbine stages and different superheating configurations, on the power output and the thermal and exergy efficiencies was conducted. Results showed the Goswami cycle can operate at an effective exergy efficiency of 60–80% with thermal efficiencies between 25 to 31%. The investigation also showed that multiple stage turbines had a better performance than single stage turbines when heat source temperatures remain above 200 °C in terms of power, thermal and exergy efficiencies. However, the effect of turbine stages is almost the same when heat source temperatures were below 175 °C. For multiple turbine stages, the use of partial superheating with Single or Double Reheat stream showed a better performance in terms of efficiency. It also showed an increase in exergy destruction when heat source temperature was increased. View Full-Text
Keywords: power and cooling; ammonia-water mixture; low-temperature cycle; Goswami cycle power and cooling; ammonia-water mixture; low-temperature cycle; Goswami cycle
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Demirkaya, G.; Padilla, R.V.; Fontalvo, A.; Lake, M.; Lim, Y.Y. Thermal and Exergetic Analysis of the Goswami Cycle Integrated with Mid-Grade Heat Sources. Entropy 2017, 19, 416.

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