A boiler generates \(4000 \mathrm{~kg} / \mathrm{h}\) of steam at \(20 \mathrm{bar}, 400^{\circ} \mathrm{C}\). The feed water temperature is \(50^{\circ} \mathrm{C}\). The efficiency of the boiler is \(80 \%\). The calorific value of fuel used is \(44,500 \mathrm{~kJ} / \mathrm{kg}\). The steam generated is supplied to a turbine developing \(450 \mathrm{~kW}\) and exhausting at 2 bar with dryness fraction 0.96. Calculate the fuel burnt per hour and turbine efficiency. Also find the energy available in exhaust steam above \(50^{\circ} \mathrm{C}\).