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A pressurised air tank supplies compressed air to a new hybrid air engine. When the hybrid...

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Mechanical Engineering

A pressurised air tank supplies compressed air to a new hybridair engine. When the hybrid engine is not running the absolutepressure in the tank is 320 bar and the temperature of the air is50°C.

Typical gas molecular values:

Gas Symbol Mr (g/mol)

Hydrogen H2 2

Oxygen O2 32

Carbon Dioxide CO2 44

Methane CH4 16

Nitrogen   N2 28

Air (none available) 28.96

Calculate:

(a) The temperature of the air in the high pressure air tankwhen the air engine starts and the absolute pressure in the tankdrops to 280 bar. Volume remains constant.

(b) The mass of air in the pressurised air tank using thetemperature and pressure from part 1 (a) and the information givenhere below.

Note:1 m3 = 1000 litres

1 bar = 1 x 105 Pa

R is the universal gas constant and is always 8.314J·K-1·mol-1

Tank volume = 450 litres pV = (m/Mr)RT

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