Molecular Physics | Thermodynamics Answers

A gas turbine receives gases from the combustion chamber at 7 bar and

650°C, with a velocity of 9 m/s. The gases leave the turbine at 1 bar with a

velocity of 45 m/s. Assuming that the expansion is Adiabatic and reversible

in the ideal gas,

calculate the power Output per unit mass flow rate,

1=1.333, Cp=1.11 KJ/Kg.K

A) Consider a country with a population of 20 million people. Suppose we need 200,000 MJ/person each year to support a satisfactory UN Human Development Index. How much energy (in MJ) is needed each year by the country? 

B) How much power (in MW) is required?

C) How many 1000 MW power plants are needed?

D) How much energy (in MJ) is needed each day?

E) Suppose the energy is obtained by consuming crude oil with an energy density of 37,000 MJ/m3. How many barrels of crude oil are required each day?

An ideal gas slowly expanded from 2m3 to 3m3 at a constant temperature of 30degrees Celsius. The entropy change of the gas was +47j/k during the process. How much heat was added to the gas during the process? Ii) how much work did the gas do during the process?

Consider a car that moves with a thermal power consumption of 100,000 W. Express the thermal power consumption in horsepower.