Vr. Dhole et Jp. Zheng, APPLYING COMBINED PINCH AND EXERGY ANALYSIS TO CLOSED-CYCLE GAS-TURBINE SYSTEM-DESIGN, Journal of engineering for gas turbines and power, 117(1), 1995, pp. 47-52
Pinch technology has developed into a powerful tool for thermodynamic
analysis of chemical processes and associated utilities, resulting in
significant energy savings. Conventional pinch analysis identifies the
most economical energy consumption in terms of heat loads and provide
s practical design guidelines to achieve this However in analyzing sys
tems involving heat and power, for example, steam and gas turbines, et
c., pure heat load analysis is insufficient. Exergy analysis, on the o
ther hand, provides a tool for heat and power analysis, although at ti
mes it does not provide clear practical design guidelines. An appropri
ate combination of pinch and exergy analysis can procine practical met
hodology for the analysis of heat and power systems. The methodology h
as been successfully applied to refrigeration systems. This paper intr
oduces the application of a combined pinch and energy approach to comm
ercial power plants with a demonstration example of a closed-cycle gas
turbine (CCGT) system. Efficiency improvement of about 0.82 percent (
50.2 to 51.02 percent) can be obtained by application of the new appro
ach. More importantly the approach can be rued as an analysis and scre
ening tool for the various design improvements and is generally applic
able to any commercial power generation facility.