Description: Slide 1: 1st law of Thermodynamics
Slide 2: The first law of thermodynamics is an extension of the law of
Slide 3:

Slide 4: For a closed system, First law of thermodynamics can be restated as: the
Slide 5: In a closed system, the transfer of energy between the surroundings and
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Slide 8: Energy can be transferred by heat, Q, by work, W, and, in the case of the
Slide 9: Energy Balance
Slide 10: With reference to system and surrounding

Slide 11: Mechanisms of Energy Transfer, Ein and Eout
Slide 12: Work Transfer (W)

Slide 13: Mass Flow, (m)

Slide 14: Noting that energy can be transferred in the
Slide 15: ENERGY BALANCE FOR CLOSED SYSTEMS
Slide 16: Because no streams enter or leave a closed system, no energy
Slide 17: For a homogeneous system, an alternative means of expression for the extensive
Slide 18: Constant-Volume Process
Slide 19: Constant-Pressure Process
Slide 20: MASS AND ENERGY BALANCES
Slide 21: Measures of Flow

Slide 22: Mass Balance for Open Systems

Slide 23: The mass balance is expressed mathematically by:

Slide 24: Steady-state flow processes are those for which conditions within the control
Slide 25: The General Energy Balance

Slide 26: The net energy transported into the system by the flowing streams is
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Slide 28: The work done by this piston in moving the unit mass through the
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Slide 30: Energy Balances for Steady-State Flow Processes

Slide 31: The only work of the process is shaft work, and the general energy
Slide 32: Division by m? gives:

Slide 33: In many applications, kinetic- and potential-energy terms are omitted
Slide 34: Heat Capacity
Slide 35: Molar heat capacity is the amount of heat energy required to raise
Slide 36: For a mechanically reversible, constant-volume process gives:

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