Advances in Engineering Advances in Engineering features breaking research judged by Advances in Engineering advisory team to be of key importance in the Engineering field. Papers are selected from over 10,000 published each week from most peer reviewed journals.
Journal Reference
Energy, Volume 88, 2015, Pages 304–313.
Kyeongsu Kim1, Ung Lee2, Changsoo Kim1, Chonghun Han1
[expand title=”Show Affiliations”]- School of Chemical and Biological Engineering, Seoul National University, Gwanak-ro 599, Gwanak-gu, Seoul 151-742, South Korea
- Engineering Research Institute, Seoul National University, Gwanak-ro 599, Gwanak-gu, Seoul 151-742, South Korea
Abstract
A cascade power generation system that utilized the cold exergy of liquefied natural gas (LNG) was proposed in this study. The proposed system adopts binary working fluids for each stage to minimize the exergy destroyed in the condensers of each stage of the cycle. The best combination of working fluids was selected through minimization of the amount of destroyed exergy by varying the flow rate, composition, and pressure of the working fluid. After selecting the working fluids, process optimization was performed through a parametric study. In addition, a sensitivity analysis was performed to observe the effect of temperature variation of the heat sources in the range of 25–85 °C on the net power generation.
As a result, the proposed cycle generated 151.78 kJ/h kgLNG under a 25 °C heat source and showed an efficiency of 18.64%. The performance of the proposed cycle was linearly increased according to the temperature of heat source. For instance, the proposed system generated 248.79 kJ/h kgLNG, with exergy efficiency of 27.11% under an 85 °C heat source.
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