Keywords: Geothermal, ORC, Solar Energy, CSP, Power Plant Efficiency__________
ABSTRACT
The performance of geothermal power systems is inversely related to ambient temperature. Summer temperature extremes can often see performance drops up to 70 % from design values in some ORC systems. Putting on additional cooling can not remedy the situation since this increases capital costs and the internal electricity consumption of the plant, thereby yielding no helpful improvement. Solar thermal technology is likewise limited by weather, especially solar radiation, but in the opposite direction. Concentrated Solar Power (CSP) technologies produce more when the solar radiation and, therefore, temperature are higher. Two technologies, therefore, react in inverse harmony to temperature fluctuations during the day.
Meanwhile, they both operate under the same principle, which is heating (or producing) a working fluid that will, in turn, drive steam turbines. Therefore, for a given thermal power island investment, a good way of “hedging production against ambient temperature fluctuations” can be achieved by combining balanced heating portions from both technologies to feed the power island. BM is currently developing this concept in its Gümüşköy GEPP that is under construction. A pilot solar field will be erected in 2012, and a full-scale implementation and integration with the system are planned for 2013.
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