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Open AccessArticle

Thermal Optimization of a Dual Pressure Goswami Cycle for Low Grade Thermal Sources

1
Department of Mechanical Engineering, Universidad Autónoma del Caribe, Barranquilla 080020, Colombia
2
AST Ingeniería SAS, Barranquilla 080001, Colombia
3
Department of Energy, Universidad de la Costa, Barranquilla 080002, Colombia
4
Department of Mechanical Engineering, Universidad del Norte, Barranquilla 081007, Colombia
5
Research School of Electrical, Mechanical and Materials Engineering, The Australian National University, Acton, ACT 2600, Australia
*
Author to whom correspondence should be addressed.
Current address: Calle 90 No. 46-112, Barranquilla 080020, Colombia.
Entropy 2019, 21(7), 711; https://doi.org/10.3390/e21070711
Received: 31 May 2019 / Revised: 24 June 2019 / Accepted: 6 July 2019 / Published: 20 July 2019
(This article belongs to the Special Issue Thermodynamic Optimization)
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PDF [1014 KB, uploaded 20 July 2019]
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Abstract

This paper presents a theoretical investigation of a new configuration of the combined power and cooling cycle known as the Goswami cycle. The new configuration consists of two turbines operating at two different working pressures with a low-heat source temperature, below 150 °C. A comprehensive analysis was conducted to determine the effect of key operation parameters such as ammonia mass fraction at the absorber outlet and boiler-rectifier, on the power output, cooling capacity, effective first efficiency, and effective exergy efficiency, while the performance of the dual-pressure configuration was compared with the original single pressure cycle. In addition, a Pareto optimization with a genetic algorithm was conducted to obtain the best power and cooling output combinations to maximize effective first law efficiency. Results showed that the new dual-pressure configuration generated more power than the single pressure cycle, by producing up to 327.8 kW, while the single pressure cycle produced up to 110.8 kW at a 150 °C boiler temperature. However, the results also showed that it reduced the cooling output as there was less mass flow rate in the refrigeration unit. Optimization results showed that optimum effective first law efficiency ranged between 9.1% and 13.7%. The maximum effective first law efficiency at the lowest net power (32 kW) and cooling (0.38 kW) outputs was also shown. On the other hand, it presented 13.6% effective first law efficiency when the net power output was 100 kW and the cooling capacity was 0.38 kW. View Full-Text
Keywords: power and cooling; ammonia-water mixture; low-temperature cycle; dual-pressure Goswami cycle power and cooling; ammonia-water mixture; low-temperature cycle; dual-pressure 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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Guzmán, G.; De Los Reyes, L.; Noriega, E.; Ramírez, H.; Bula, A.; Fontalvo, A. Thermal Optimization of a Dual Pressure Goswami Cycle for Low Grade Thermal Sources. Entropy 2019, 21, 711.

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