From an input of electricity, an electric resistance furnace operating at a steady state delivers energy by heat transfer to a dwelling at the rate Qu at a use temperature Tu$.$there are no other significant energy transfers. 

 

$($a$)$ Devise a second law efficiency for the furnace.

$($b$)$ Evaluate the efficiency obtained in part $($a$)$ for a use temperature of $35$ degrees Celsius and T$0=20$ degrees Celsius

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To determine the second law efficiency of the electric resistance furnace operating at a steady stat... View the full answer