Question

What is the thermal efficiency of a gas power cycle using thermal energy reservoirs at 627°C and 90°C?

Answer 1

Answer:

The value is $\eta = 63\%$

Explanation:

Generally the thermal efficiency is mathematically represented as

$\eta = 1 - \frac{T_L}{T_H} * 100$

substituting  [ 627°C + 273  =  900K ]  for  $T_H$ and    [ 90°C + 273  =  333K ]  for $T_L$

   So  

         $\eta = 1 - \frac{333}{900} *100$

=>     $\eta = 63\%$