Energy Transfer

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MOVING BOUNDARY WORK (cont’d)• A gas can follow several different paths as it(say) expands from state 1 to state 2. Ingeneral, each path will have a different areaunderneath it, and since this area represents themagnitude of work, the work done will bedifferent for each process (See Fig 3-21).• Note: work is a path function (i.e., it depends onthe path followed as well as the end states).• If work were not a path function, no cyclicdevices (car engines, power plants) couldoperate as work producing devices.Energy Transfer 16© Copyright 2005 Prof. Arun S. Mujumdar.
Boundary Work during a Constant-Volume Process (Example 3-5)A rigid tank contains air at 500 kPa and 150ºC. Asa result of heat transfer to the surroundings,the temperature and pressure inside the tankdrop to 65ºC and 400 kPa, respectively.Determine the boundary work done during thisprocess. No volume change. Hence,W2b P dV 010Energy Transfer 17© 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: MOVING BOUNDARY WORK (cont’d)•
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 and 48: Total Energy of a Flowing Fluid•
Page 49 and 50: Closing Remarks - Chapter 3• This

Energy Transfer

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