Abstract
High density working fluids such as the fluoro-carbons can be used with advantage at the low temperature end of power generation cycles. Two applications are examined in a gas turbine binary cycle, which offers a compact plant of good efficiency for moderate load factor only, and a steam turbine binary cycle which allows the capacity of single shaft machines to be raised above 1000 MW. The attractions and problems of such cycles are discussed and the factors leading to the selection of a suitable fluid outlined.
The paper seeks principally to illustrate the range of turbine development problems posed by the thermodynamic and other properties of the preferred fluid. Factors influencing the choice of turbine type and detailed blading profile are examined. Preferred designs are evolved and performance estimates made.
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