Special Issue "Entropy Generation Minimization"

Guest Editor
Prof. Dr. Heinz Herwig
Hamburg University of Technology, Institute of Thermo-Fluid Dynamics, M-21, Denickestr. 17, D-21071 Hamburg, Germany
Website: http://www.tu-harburg.de/tt/mitarbeiter/herwig/herwig.en.html
E-Mail:
Phone: ++49 (0)40-42878-3044
Fax: ++49 (0)40-42878-4169
Interests: enhancement of heat and mass transfer (fundamental investigations and development of adapted sanctions); critical use of commercial CFD-Software; evaluation of transport phenomena by entropy production considerations; influence of heat transfer on flow stability; fundamental investigations of momentum-, heat- and mass-transfer in components of micro fluid devices; LDV measurements in turbulent separated flows

Dear Colleagues,

In almost all technical applications momentum, heat, and/or mass transfer occurs. These transfer processes are subject to "losses", which from a thermodynamic point of view can be identified as losses of exergy (available work). A second law analysis (SLA) is appropriate to identify and to quantify these losses by determining the entropy generation involved. Whenever exergy losses are disadvantageous and should be avoided as far as possible it comes to an "Entropy Generation Minimization". The special issue of Entropy collects studies that account for the entropy generation in this sence in various fields.

Heinz Herwig
Guest Editor

Submission

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• second law analysis
• loss of exergy
• loss of available work
• optimization

Type of Paper: Article
Title: Entropy Generation during the Interaction of Thermal Radiation with a Surface
Author: Stephan Kabelac
Affiliation: Institute for Thermodynamics, Helmut-Schmidt University of the Federal Armed Forces Hamburg, D-22039 Hamburg, Germany;
E-Mail: Kabelac@hsu-hh.de
Abstract: Even though solar radiation is an incoming energy flux which is free of cost, the efficiency of solar energy conversion devices is of interest. Photovoltaic cells as well as thermal solar power plants have a high material expendture, which can be reduced only if the plant conversion efficiency is increased. The study of the basic mechanisms which influence the entropy generation upon reflection, absorption and transmission of thermal radiation interacting with technical surfaces can help to increase the radiation conversion efficiency. A lot of research effort has been devoted to the entropy generation in atmospheric physics, but less is known about the radiation-surface interaction. The article will recall the calculation procedure for arbritary radiation entropy and work out the influence of the optical parameters of an irradiated surface on the entropy production rate. As there are the solid angle, the spectral distribution and the degree of polarization which influence the radiation entropy, these parameters are candidates to optimize the optical properties of a surface for a specific radiation application.