Page 106 - DJJ20063- Thermodynamics 1

DJJ20063- Thermodynamics 1

Activity 3B

TEST YOUR UNDERSTANDING BEFORE YOU CONTINUE WITH THE NEXT INPUT…!

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3.4 0.112 m of gas has a pressure of 138 kN/m . It is compressed to 690 kN/m
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according to the law pV = C. Determine the new volume of the gas.

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3.5 0.014 m of gas at a pressure of 2070 kN/m expands to a pressure of 207 kN/m
according to the law pV 1.35 = C. Determine the work done by the gas during
expansion.

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3.6 A cylinder containing 0.07 kg of fluid has a pressure of 1 bar, a volume of 0.06 m
and a specific internal energy of 200 kJ/kg. After polytropic compression, the
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pressure and volume of the fluid are 9 bar and 0.011 m respectively, and the
specific internal energy is 370 kJ/kg.

Determine
a) the amount of work energy required for the compression

b) the quantity and direction of the heat energy that flows during the

compression.

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