whenever it is
intended to solve a problem through the scope of exergy
analysis, a specific exergy loss should be found, which
minimizes operational costs. Several tools, including CCs,
Exergy Composite Curve (ECC), Exergy Grand Composite
Curve (EGCC), were used in the diagnosis of process
exergy utilizing. The CCs (Fig. 17) can be redrawn by
replacing the temperature axis with the Carnot factor
Zc ¼ (1T0/T), resulting in the ECC (Fig. 18). The
area between the hot and cold CCs is proportional to the
exergy loss, which is denoted (sTo)HEN. Thus (sTo)HEN is
proportional to the amount of ideal work equivalent
lost in heat transfer? The analogous concept applies for
the GCC.