Energy Transfer

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Boundary Work for a Constant-PressureProcess (Example 3-6)• A frictionless piston-cylinder device contains 10lbm of water vapor at 60 psia and 320ºF. Heat isnow transferred to the steam until thetemperature reaches 400ºF. If the piston is notattached to a shaft and its mass is constant,determine the work done by the steam duringthis process.• Not in SI units but illustrates a point!Note this is a constant pressure process.Energy Transfer 18© Copyright 2005 Prof. Arun S. Mujumdar.
Boundary Work for a Constant-PressureNote:Process (Example 3-6)2 P dV P0 dV P0(V2Wb V1)1W b mP0(V2 V 1 )Work = mass x pressure x change of volume ofsystem21Energy Transfer 19© 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: Boundary Work during a Constant-Vol
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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