Energy Transfer

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Energy Transport by Mass• In open systems (control volumes) note thatenergy transfer can also occur due to mass flowin or out over control surfaces• Amount of energy transported by mass, E mass =m (kJ)• This equation can also be written in rate form bysimply taking time derivative of the aboveequation, i.e. simply place a dot over E and mStudy Example 3-14 (estimation of mass andenergy leaving a pressure cooker in a given timeby application of the rate form of conservationof mass to a CV (figure 3-53))Energy Transfer 48© Copyright 2005 Prof. Arun S. Mujumdar.
Closing Remarks – Chapter 3• This chapter defines various forms ofenergy and how energy transfer can occurin closed and open systems• Reviews definitions of work, heat, internalenergy, enthalpy, etc.• In chapter 4 these concepts are appliedalong with the First Law ofThermodynamics to a number of simplepractical systems involving gases andliquidsEnergy Transfer 49© 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 and 30: Non-mechanical Forms of Work• Som
Page 31 and 32: Energy Balance:The net change (incr
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: Total Energy of a Flowing Fluid•

Energy Transfer

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