Abstract
A new type of geothermal power plant is proposed and analysed, which combines the advantages of the binary and the dual-flashing units. This combination avoids some of the shortcomings of conventional binary plants. At their optimum conditions these binary dual-flashing plants may produce up to 40% more work than a conventional binary optimized unit. Any fluid with suitable thermodynamic properties may be used as secondary fluid. For this study ammonia, freon-12 and isobutane have been used in the secondary Rankine cycle. Two parameters are optimized in the binary dual-flashing plant, namely the temperature of evaporation and the dryness fraction in the evaporator. The optimization procedure and the governing equations for the operation of the new plants are described in the paper.
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