A reversible power cycle operates with a thermal efficiency of 75%. The cycle receives energy input by heat from a thermal reservoir at 1200K. What is the temperature, in K, of the low temperature thermal reservoir

The temperature of the low temperature thermal reservoir is 300 K.

Explanation:

All reversible power cycles are equivalent to the Carnot's cycle, whose equation for efficiency is:

(Eq. 1)

Where:

- Thermal efficiency, dimensionless.

- High temperature reservoir, measured in Kelvin.

- Low temperature reservoir, measured in Kelvin.

Now we proceed to clear the low temperature reservoir within:

If and , then:

The temperature of the low temperature thermal reservoir is 300 K.

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