The exergy carry-over index for a utility system

Abstract

An exergy analysis has been conducted for the utility system of an integrated sugar cane processing plant. A 22 MW boiler supplies steam to five turbines. The availability or exergy analysis establishes the amount of chemical and thermal energy that can possibly be transformed into work. Of the 100 units of available energy from the fuel, only 62.2 units are exergy. The steam cycle absorbs 60.3 energy units, of which 21.0 are exergy. The exergy carry-over index for the boiler is 0.56. The steam transfers to the turbines 2.2 energy units, all of which are exergy. The index is 2.86 for the steam cycle and 1.61 for the combined installation.