What is the minimum temperature of the boiler

Reference no: EM13986603

1) A steam engine produces 155 MJ of useful work for every 9 kg of coal. Since coal has a heat of combustion of 31 MJ/kg, what is the minimum temperature of the boiler if the outside temperature is 28^oC? Please provide your answer in Kelvin, using K as your unit.

2) Thomas the Tank Engine actually operates in an ideal Carnot cycle. Early in the morning, his fire is not yet completely going: his tank temperature is 190^oC, and he only operates at 36 percent efficiency. Later in the day, his tank temperature is up to the normal 540^oC. If the outside temperature did not change, what is his percentage efficiency?

3)A Carnot Heat Engine operates between a high temperature TH and a low temperature TL. Which one of the following would increase its efficiency?

a)Increasing TH.
b)Increasing TL
c)Decreasing TH.
d)Making sure that TH and TL are close.

Reference no: EM13986603

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