Redecker, ChristophChristophRedeckerHerwig, HeinzHeinzHerwig2020-06-082020-06-082014-08Proceedings of the 15th International Heat Transfer Conference, IHTC-15 : August 10-15, 2014, Kyoto, Japan. - Kyoto, 2014.http://hdl.handle.net/11420/6264In this paper it is shown that the basis for a physically meaningful assessment of every energy transfer (including conversions from one form of energy to another) lies in the correct interpretation of entropy generation. First it is shown that the effect of components in energy transfer situations on the available work (e.g. the power outcome of a working process) results from the flows of energy and entropy and the generation of entropy in a component. Next the energy devaluation number assessment criterion is introduced. It is based on the entropic potential of an energy flow. It is explained how this universal criterion allows the assessment of arbitrary situations in energy transfer. An example illustrates the advantages over the often used thermohydraulic performance, i.e. a combination of the Nusselt number and the friction factor.enThermodynamicsEnergy EfficiencyHeat ExchangerSecond Law AnalysisPhysikTechnikIngenieurwissenschaftenConference Paper10.1615/IHTC15.tdy.009184Other