Energy Transfer

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Total Energy – An Outcome of the First Law• A major consequence of the first law is the existenceand the definition of the property total energy E. thenet work is the same for all adiabatic processes of aclosed system between two specified states, thevalue of the net work must depend on the end statesof the system only, and thus it must correspond to achange in a property of the system.• This property is the total energy. The first law statesthat the change in the total energy during anadiabatic process must be equal to the net workdone.• Therefore, any convenient arbitrary value can beassigned to total energy at a specified state to serveas a reference point.Energy Transfer 30© Copyright 2005 Prof. Arun S. Mujumdar.
Energy Balance:The net change (increase or decrease) in thetotal energy of the system during a process isequal to the difference between the totalenergy entering and the total energy leavingthe system during that process. That is,during a process,TotalenergyTotalenergyChangein thetotal enteringthe systemleavingthe systemenergy of the system or, E in - E out = E systemEnergy Transfer 31© Copyright 2005 Prof. Arun S. Mujumdar.
Page 1: ME2121 Engineering ThermodynamicsEN
Page 5 and 6: Heat and work are energy transfer m
Page 7 and 8: ENERGY TRANSFER BY WORK (Cont’d)
Page 9 and 10: • Path functions have inexact dif
Page 11 and 12: MECHANICAL FORMS OF WORK (cont’d)
Page 13 and 14: MOVING BOUNDARY WORK (cont’d)•
Page 15 and 16: MOVING BOUNDARY WORK (cont’d)•
Page 17 and 18: Boundary Work during a Constant-Vol
Page 19 and 20: Boundary Work for a Constant-Pressu
Page 21 and 22: Isothermal Compression of anIdeal G
Page 23 and 24: Gravitational Work• Gravitational
Page 25 and 26: dsV ds VdtdtWa21F ds2 dV m(V dt
Page 27 and 28: Then the shaft work is given by:W s
Page 29: Non-mechanical Forms of Work• Som
Page 33 and 34: whereUm(u2 u1 2KE m( V2V2PE mg (z
Page 35 and 36: First Law: Statement• Heat input
Page 37 and 38: • An expression for the specific
Page 39 and 40: du = Cv(T) dT andHence,andudh = Cp
Page 41 and 42: The ideal gas specific heats of mon
Page 43 and 44: Conservation of Mass PrincipleSecti
Page 45 and 46: ExamplesFor incompressible fluid (n
Page 47 and 48: Total Energy of a Flowing Fluid•
Page 49 and 50: Closing Remarks - Chapter 3• This

Energy Transfer

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