Abstract
From the thermodynamic point of view, an evaluation of energy flow is very important for energy saving. In this paper, the mathematical regularity of available energy is examined such that a value of parameters is influenced by the neighborhood of environment. A part of available energy is disappeared or produced by a variation of outer system. These phenomena are explained by a transposition from available energy to unavailable energy induced by a variation of environment. This study deals with these transposition of available energy for ideal gas change and polytropic change. The purpose of this paper is to investigate the transposition from available energy to unavailable energy or vice versa in more detail.
