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Chap5EnergyAnalysisofClosedSystems

# Chap5EnergyAnalysisofClosedSystems - Chapter 5 Energy...

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1 Chapter 5 Energy Analysis of Closed Systems Work Transfer • Mechanics : The work is done by a force as it acts upon a body moving in the direction of force. • Thermodynamics : Work transfer is considered as occurring between the system and the surroundings. Work is said to be done by a system if the sole effect on things external to the system can be reduced to the rising of a weight. Figure 4.1 Nitrogen and gaseous air are pure substances. Figure 4.2 A mixture of liquid and gaseous water is a pure substance, but a mixture of liquid and gaseous air is not. Fig 4.1 Work transfer

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2 PdV work or displacement work PdV work or displacement work dV adL = 2 1 2 1 V V W P d V = State 1: P 1 , V 1 - Thermodynamic equilibrium State 2: P 2 , V 2 - Thermodynamic equilibrium If a is area of piston and dL is infinitesimal distance, then Where is the infinitesimal displacement volume The integration of PdV can be performed only on a quasi-static path = 2 1 PdV W b
3 Path function and point function 2 1 d V V V = 2 2 1 1 dW W =

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Chap5EnergyAnalysisofClosedSystems - Chapter 5 Energy...

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