During the past few decades, exergy analysis has emerged as an important tool for design, analysis and performance improvement of thermal systems. One can define exergy, from the thermodynamic point of view, as the maximum amount of work which can be produced by a quantity or flow of matter, heat or work as it comes to equilibrium with a reference environment (Dincer & Rosen, 2007). Of course, exergy, unlike energy, is not subject to a conservation law, but rather is consumed or destroyed due to irreversibilities in any real process. Exergy is a measure of the potential of a flow to cause change, as a consequence of not being in complete equilibrium relative to the reference environment. One key
requirement is that the state of the reference environment must be specified by specifying its temperature, pressure and chemical composition. Furthermore, the exergy method can help further the goal of more efficient energy-resource use, for it enables the locations, types and magnitudes of waste emissions and internal losses to be determined. Therefore, exergy analysis indicates whether or not and by how much it is possible to design more efficient thermal systems by reducing inefficiencies. Increased efficiency can contribute significantly to improving energy security and environmental
acceptability by reducing irreversibilities. These features make exergy analysis a powerful tool for providing optimum drying conditions. Exergy analysis becomes more useful for industrialscale high-temperature drying applications. In this regard, several