Energy and exergy analyses of single and double reheat irreversible Rankine cycle

Abstract

In this paper, energy and exergy analyses based on the thermal efficiency, exergy efficiency, exergetic performance criterion, exergy destruction and net specific work output have been performed for irreversible single reheat Rankine cycle (SRRC) and double reheat Rankine cycle (DRRC). The effects of the reheat pressure, boiler pressure and boiler temperature on the general and optimal performance of the cycle are investigated by taking into account the mechanical, boiler and isentropic efficiencies. The maximum values of the exergy efficiencies and specific net work outputs and their corresponding reheat pressures are obtained for the SRRC and DRRC. It is pointed out that exergy efficiencies and specific net work outputs are considerably affected by the reheat pressure, the boiler pressure and the boiler temperature for both of the cycles.

Performance evaluation of a mercury-steam combined-energy-generation system (MES)

“…However, the P 13 leads to similar variation for P O and _ m f . The maximum values of P O , _ Ex dest , and _ m f are obtained at 7500 kPa of P 9 ; however, the peak P d , ε, and ECOP are attained at 17 500 kPa of P 9 . The values of the P 13 are 4750, 7500, 6250, and 4150 kPa at the maximum P O , _ Ex dest , _ m f , and P d -ε-ECOP, respectively.…”

“…Consequently, the power of all over system increases. _ Ex dest , _ m f , and _ m S also increases with increasing P O and T 8 to provide heat balance in the HEX at constant P 9 . Increasing values of _ m f and _ m S negatively affect the P d , ε, and ECOP variation.…”

“…The sum of destructed exergy and product exergy gives the total exergy of each component; the total exergy is stated as follows: …”

“…They showed that reheat pressures affect substantially the thermal efficiency and net work of the cycles. Gonca conducted exergy analysis for the single‐ and double‐reheat irreversible Rankine cycles. It was reported that the exergetic efficiency is considerably affected by boiler temperature, boiler pressure, and reheat pressures.…”

Thermodynamic and economic analysis of performance evaluation of all the thermal power plants: A review

“…Vandani, Bidi, and Ahmadi . Gonca investigated irreversible single reheat Rankine cycle and the double reheat Rankine cycle and analyzed cycles based on thermal and exergy efficiencies, exergetic performance criterion, net specific work and exergy destruction . In another research, the performance of several coal‐fired power plants were analyzed and compared by applying energy and exergy approaches, which facilitate designing process and assessment of inefficiencies .…”