Exergy analysis for unsteady-state heat conduction

This study presents a methodology for unsteady-state exergy analysis that can be used to study heat conduction problems. Governing equations of entropy and exergy to be parallel to the governing equation of energy are derived in their partial differential forms, and their numerical methods are presented in detail. Based on the proposed methodology, an unsteady-state exergy analysis of a heat conduction problem for a concrete wall is carried out to demonstrate its transient exergy behavior.