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Session: Parallel Session: Cycle efficiency
Session starts: Friday 23 September, 16:00
Presentation starts: 16:40
Room: Senaatszaal

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Pall Valdimarsson (Professor, University of Iceland)

Abstract:
The performance of real power cycles for heat source in the temperature range from 100°C to 300°C is studied in this paper. A reference is made to four ideal power production cycles: Carnot, Reversible Heat Engine (RHE), Triangular and Lorenz. The real cycles are assumed to have infinite heat exchanger area, and it is as well assumed that cooling fluid is produced by external means, without being a parasite of the power plant. The binary cycles studied are ORC with a single high pressure level as well as two pressure levels, a saturated Kalina cycle and a supercritical cycle. Single and double flash geothermal power cycles are included as well. A few different working fluids are considered for the ORC cycles, and a few different ammonia concentrations for the Kalina cycle. The produced power for these cycles from the same source is then compared and a range of superiority for each cycle presented. The effect of recuperation on the produced power as well as on the calculated efficiency is shown. Finally the influence of finite heat exchanger area is analyzed and an estimate of the cooling fluid generation parasitic power made both for air and wet cooling tower system.