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Open AccessArticle

Exergy Losses in the Szewalski Binary Vapor Cycle

by Tomasz Kowalczyk 1,2,*, Paweł Ziółkowski 1,2,† and Janusz Badur 2,†
Conjoint Doctoral School at the Faculty of Mechanical Engineering, Gdansk University of Technology, Gabriela Narutowicza 11/12 st., Gdańsk 80-233, Poland
Energy Conversion Department, Institute of Fluid-Flow Machinery PAS-ci, Fiszera 14 st., Gdansk 80-283, Poland
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editors: Michel Feidt, Daniel Tondeur, Jean-Noël Jaubert and Romain Privat
Entropy 2015, 17(10), 7242-7265;
Received: 22 July 2015 / Revised: 14 September 2015 / Accepted: 9 October 2015 / Published: 23 October 2015
(This article belongs to the Special Issue Selected Papers from 13th Joint European Thermodynamics Conference)
In this publication, we present an energy and exergy analysis of the Szewalski binary vapor cycle based on a model of a supercritical steam power plant. We used energy analysis to conduct a preliminary optimization of the cycle. Exergy loss analysis was employed to perform a comparison of heat-transfer processes, which are essential for hierarchical cycles. The Szewalski binary vapor cycle consists of a steam cycle bottomed with an organic Rankine cycle installation. This coupling has a negative influence on the thermal efficiency of the cycle. However, the primary aim of this modification is to reduce the size of the power unit by decreasing the low-pressure steam turbine cylinder and the steam condenser. The reduction of the “cold end” of the turbine is desirable from economic and technical standpoints. We present the Szewalski binary vapor cycle in addition to a mathematical model of the chosen power plant’s thermodynamic cycle. We elaborate on the procedure of the Szewalski cycle design and its optimization in order to attain an optimal size reduction of the power unit and limit exergy loss. View Full-Text
Keywords: ORC; steam cycle; binary cycle; hierarchical cycle ORC; steam cycle; binary cycle; hierarchical cycle
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Kowalczyk, T.; Ziółkowski, P.; Badur, J. Exergy Losses in the Szewalski Binary Vapor Cycle. Entropy 2015, 17, 7242-7265.

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