(15%) Two different fuels are being considered for a

3.0MW

(net output) heat engine which can operate between the highest temperature produced during the burning of the fuels and an atmospheric temperature of

273K

. Fuel A burns at

2,600K

, delivering 50

M(J)/(k)g

(heating value) and costs

$(2.00)/(k)g

. Fuel B burns at

1,500K

, delivering

40M(J)/(k)g

and costs

$(1.50)/(k)g

. Compare the fuel costs per hour of fuel A and fuel B, assuming that the heat engine operates\ a. at Carnot efficiency\ b. at

50%

of Carnot efficiency

(15\%) Two different fuels are being considered for a 3.0 MW (net output) heat engine which can operate between the highest temperature produced during the burning of the fuels and an atmospheric temperature of 273K. Fuel A burns at 2,600 K, delivering 50 MJ/kg (heating value) and costs $2.00/kg. Fuel B burns at 1,500K, delivering 40MJ/kg and costs $1.50/kg. Compare the fuel costs per hour of fuel A and fuel B, assuming that the heat engine operates a. at Carnot efficiency b. at 50% of Carnot efficiency