Publications

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Exergy is the elixir of life. Exergy is that portion of energy available to do work. Elixir is defined as a substance held capable of prolonging life indefinitely, which implies sustainability of life. In terms of mathematics and engineering, exergy sustainability is defined as the continuous compensation of irreversible entropy production in an open system with an impedance and capacity-matched persistent exergy source. Irreversible and nonequilibrium thermodynamic concepts are combined with self-organizing systems theories as well as nonlinear control and stability analyses to explain this definition. In particular, this paper provides a missing link in the analysis of self-organizing systems: a tie between irreversible thermodynamics and Hamiltonian systems. As a result of this work, the concept of ''on the edge of chaos'' is formulated as a set of necessary and sufficient conditions for stability and performance of sustainable systems. This interplay between exergy rate and irreversible entropy production rate can be described as Yin and Yang control: the dialectic synthesis of opposing power flows. In addition, exergy is shown to be a fundamental driver and necessary input for sustainable systems, since exergy input in the form of power is a single point of failure for self-organizing, adaptable systems.

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Version 6.0 of the IFCI code is being assessed by comparing predictions against the results of several experiments. Simulations of the first two of these experiments, MAGICO-701 and MIXA-6, have been completed with a reasonable level of success. Agreement with the MAGICO-701 experiment was good but was limited somewhat by the inherent problem of numerical diffusion. Results of the MIXA-6 calculations were comparable to those of CHYMES, but clearly suggested the need for an inter-cell radiation transport model in IFCI.