ABSTRACT

The exergy of a system that is at the dead state is zero. It follows that the exergy of a system that is not at the dead state is non-zero, but not whether it is positive or negative. Exergy can be transferred – added to or removed from, a system as a result of its interaction with the surroundings. These interactions may be classified as, addition or removal of, work, heat and mass. An important aspect of exergy change due to heat transfer is the dependence on the temperature of the system with reference to the dead state temperature. The chapter aims to quantify the magnitude of the exergy transferred as a result of heat supplied from/rejected to reservoirs that are at temperatures above and below the dead state temperature.