Thermal Efficiency For Heat Engine Working At High Temperatures - Engineering Assignment Help

Assignment Task -

QUESTION 1

Calculate the maximum thermal efficiency for a heat engine working between temperatures of 800ºC and 15ºC

QUESTION 2

A Carnot cycle engine using air as a working fluid has a volume expansion ratio of 16:1.  It operates between temperatures of 300ºC and 23ºC.  Calculate:

(a) The volume ratios for the isothermal and adiabatic parts of the cycle.

(b) Thermal efficiency.

QUESTION 3

What is the difference between a reversible engine and a reversible cycle?

QUESTION 4

A Carnot cycle engine using air as a working fluid operates between a heat source which has a temperature of 800ºC and a heat sink which has a temperature of 15ºC.  The maximum and minimum pressures are 21 MPa and 0.1 MPa.  Calculate thermal efficiency and work ratio.

QUESTION 5

0.23 kg of gas a gas with a gas constant of 280 J/kg.K and a ratio of specific heats of 1.4, undergoes a Carnot cycle between temperatures of 300ºC and 50ºC.  The volume ratio of the isothermal process is 2.5:1.  Calculate:

(a) Thermal efficiency. 

(b) Net work. 

(c) Work ratio.

QUESTION 6

Heat is supplied to a Carnot cycle at a temperature of 400ºC.  Its thermal efficiency is 55 %.  The volume ratio of the isothermal process is 2.8:1.  Calculate:

(a) The temperature at which heat is rejected. 

(b) Volume ratio of the adiabatic process.

(c) Overall volume ratio.

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