The engine that powers a crane burns fuel at a flame temperature of 2000 deg Celsius?

It is cooled by 20 deg Celsius air. The crane lifts a 2000 kg steel girder 30 m upward. How much heat energy is transferred to the engine by burning fuel if the engine is 40% as efficient as a Carnot engine?

One Response to “The engine that powers a crane burns fuel at a flame temperature of 2000 deg Celsius?”

  1. Lee Wang Tui  on October 21st, 2011

    Maximum power cycle,
    η_max = W/Qh = Th-Tc/Th
    Qh = W*Th / Th-Tc
    Qh = mgh*Th / Th-Tc
    Qh = 2000*9.81*30*2273 / 1980
    Qh = 675.701 kW

    Heat energy transferred to the engine,
    Q = 40% Qh
    Q = 270.2804 kW

    Reply


Leave a Reply