5.3. Exergy losses calculation for existing and retrofitted
cycle
The environment parameters are assumed as follows:
P0 ¼ 101 325 Pa, T0 ¼ 298.15 K [22]. The exergy analysis of
the existing chillers and the chillers with the proposal
refrigeration levels are carried out using DEx ¼
DH 1 ðT0=TÞ . The results are summarized in Table 10.
Regarding the fact that the existing compressor’s shaftwork
is W ¼ 12,780 kW the exergy efficiency is found to be:
Z