Assessment and numerical optimization of heat exchangers based on an energy devaluation number

Es werden das Konzept des entropischen Potenzials und die Energieentwertungszahl entwickelt. Ihre Vorteile gegenüber anderen Bewertungskriterien für Wärmeübertrager werden demonstriert. Dazu wird ein neues Verfahren für die automatisierte Geometrieoptimierung von Wärmeübertragern durch CFD-Rechnungen vorgestellt. Dieses basiert auf der Beschreibung von Oberflächen durch Fourierkoeffizienten und deren Optimierung durch einen evolutionären Algorithmus.The entropic potential concept as well as the energy devaluation number is developed. Their advantage over common evaluation criteria for heat exchangers is demonstrated. For that purpose, a new method for the automated geometry optimization of heat exchangers based on CFD calculations is presented. It is based on the description of surfaces by Fourier coefficients and their optimization by an evolutionary algorithm

The Entropic Potential Concept: a New Way to Look at Energy Transfer Operations

Energy transfer operations or processes are systematically analyzed with respect to the way they can be assessed. It turns out that the energy transfer should not only be characterized by the operation or process itself but that it should be seen in a wider context. This context is introduced as the entropic potential of the energy that is transferred. It takes into account the overall transfer from the energy in its initial and finite states, i.e., starting as pure exergy when it is a primary energy, for example, and ending as pure anergy when it has become part of the internal energy of the ambient. With this concept an energy devaluation number can be defined which has several properties with a reasonable physical background. Two examples of different complexity of the process assessed are given and discussed with respect to the physical meaning of the new energy devaluation number

The entropic potential concept: a new way to look at energy transfer operations

Energy transfer operations or processes are systematically analyzed with respect to the way they can be assessed. It turns out that the energy transfer should not only be characterized by the operation or process itself but that it should be seen in a wider context. This context is introduced as the entropic potential of the energy that is transferred. It takes into account the overall transfer from the energy in its initial and finite states, i.e., starting as pure exergy when it is a primary energy, for example, and ending as pure anergy when it has become part of the internal energy of the ambient. With this concept an energy devaluation number can be defined which has several properties with a reasonable physical background. Two examples of different complexity of the process assessed are given and discussed with respect to the physical meaning of the new energy devaluation number.Energy transfer operations or processes are systematically analyzed with respect to the way they can be assessed. It turns out that the energy transfer should not only be characterized by the operation or process itself but that it should be seen in a wider context. This context is introduced as the entropic potential of the energy that is transferred. It takes into account the overall transfer from the energy in its initial and finite states, i.e., starting as pure exergy when it is a primary energy, for example, and ending as pure anergy when it has become part of the internal energy of the ambient. With this concept an energy devaluation number can be defined which has several properties with a reasonable physical background. Two examples of different complexity of the process assessed are given and discussed with respect to the physical meaning of the new energy devaluation number