A newly proposed device for generating electricity from the sun is a heat engine in which the hot reservoir is created by focusing sunlight on a small
spot on one side of the engine. The cold reservoir is ambient air at 20 ∘C. The designer claims that the efficiency will be 35%.

What minimum hot-reservoir temperature, in ∘C, would be required to produce this efficiency?

Question

A newly proposed device for generating electricity from the sun is a heat engine in which the hot reservoir is created by focusing sunlight on a small
spot on one side of the engine. The cold reservoir is ambient air at 20 ∘C. The designer claims that the efficiency will be 35%.

What minimum hot-reservoir temperature, in ∘C, would be required to produce this efficiency?

savy · Answer

@phi @Nnesha can either of you help with this?