Converting sunlight to electricity with solar cells has an efficiency of _15,. Its possible to achieve a higher efficiency (though currently at higher cost) by using concentrated sunlight as the hot reservoir of a heat engine. Each dish in Figure P11.41 concentrates sunlight on one side of a heat engine, producing a hot reservoir temperature of 650C. The cold reservoir, ambient air, is approximately 30C. The actual working efficiency of this device is _30,. What is the theoretical maximum efficiency?
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