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The Miravalles geothermal power station in Costa Rica is described before and after the addition of Unit 5, a bottoming binary power plant. The early planning and design alternatives for the new unit, the bids, the selection criteria followed, and details of the final design, including the unique asymmetrical piping layout, are discussed. The performance of Unit 5 is assessed both on a cycle and an...
The Carnot cycle is reviewed as to its appropriateness to serve as the ideal model for geothermal binary power plants. It is shown that the Carnot cycle sets an unrealistically high upper limit on the thermal efficiency of these plants. A more useful model is the triangular (or trilateral) cycle because binary plants operating on geothermal hot water use a non-isothermal heat source. The triangular...
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