N2 - Heat transfer is an irreversible process. This article defines the entropy increment as a measure of energy degradation in heat transfer realized in typical surface heat exchangers. As an example of the proposed entropy increase method, presented below are the calculations for heat exchangers working in a typical Clausius-Rankine cycle. The entropy increase in such exchangers inevitably leads to increased fuel consumption and, as a further consequence, to increased carbon dioxide emission. L1 - http://journals.pan.pl/Content/94439/PDF/10_paper.pdf L2 - http://journals.pan.pl/Content/94439 PY - 2013 IS - No 3 September EP - 160 DO - 10.2478/aoter-2013-0021 KW - The second law of thermodynamics in heat KW - Heat and mass transfer KW - Entropy increment KW - Surface heat exchangers KW - Clausius-Rankine cycle A1 - Drożyński, Zbigniew PB - The Committee of Thermodynamics and Combustion of the Polish Academy of Sciences and The Institute of Fluid-Flow Machinery Polish Academy of Sciences DA - 2013 T1 - Entropy increase as a measure of energy degradation in heat transfer SP - 147 UR - http://journals.pan.pl/dlibra/publication/edition/94439 T2 - Archives of Thermodynamics