Question

Problem 11.30 < 7 of 1 M Review Cond Part A Converting sunlight to electricity with solar cells has an efficiency of 15% It's 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 the figure concentrates sunlight on one side of a heat engine, producing a hot-reservoir temperature of 600 °C. The cold reservoir, ambiental is approximately 24°C. The actual working efficiency of this device is 30%. (Figure 1) What is the theoretical maximum efficiency? Express your answer using two significant figures. ? 10 AEGR O emas - 65.9 Figure 1 of 1 > Subie Previous Answers Request Answer * Incorrect; Try Again; 27 attempts remaining Provide Feedback

Answer 1

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Given that,

Temperature of hot reservoir,

Ti = 600°C = 600 + 273 K = 873 K

Temperature of cold reservoir,

T, = 24C = 24 + 273 K = 297 K

Assuming the setup as a Carnot engine, Theoretically, Maximum Efficiency is given by,

=1-12 = 1 - 373 K 297 K

Emar = 1-0.34

emar = 0.66

Converting into percentage:

emar = 0.66 x 100%

emax = 66%

PS: Your answer was correct, but the question demands to round the answer into two significant figures.

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