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What is the main problem in a solar thermo-mechanical system as the collection (operating) temperature increases?

What is the main problem in a solar thermo-mechanical system as the collection (operating) temperature increases? Correct Answer Efficiency of collection system decreases but engine efficiency increases

The main problem in a solar thermo-mechanical system is that as the collection (operation) temperature increases efficiency of the collection system decreases. However, the engine efficiency increases as the temperature of working fluid increases.

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