first law of thermodynamics

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. first law of thermodynamics. 21 . . 22 . (internal energy ) U. - PowerPoint PPT Presentation

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  • first law of thermodynamics

  • 21

  • 22 (internal energy) UUch Unu UemUthUk Up ()Uk+UpUJ , kJ(2-1)J/kg , kJ/kg

  • (total energy of thermal system)()0z0cfm.(2-2)(2-3)(2-4)

  • 2-3

  • () ()

  • 2-4 Enthalpy (2-5)(2-5a)2-6(2-6)(2-1)(2-7)(2-8)

  • huU h

  • 25 - = (2-9)21UWQQWU = U2 - U1(2-10)()+-

  • (2-10b)2-12(2-11a)2-15 (2-12a,b)2-162-17(2-12)(2-11)2-14(2-10c)2-13(2-10a)2-11(1-7)1-8

  • 2-6 d1-1m1(dV1) 2-2m2(dV2) QWi,(CV)

  • (2-13)2-18(2-15)2-20

  • (2-15)2-20 m(2-16)(2-17)(2-16a)(2-17a)(2-21)(2-23)(2-22)(2-24)

  • 1. 2. (technical work) wt+(2-19)2-26(2-20)2-27(2-21)2-28(2-16)(2-21)(2-25)

  • 3.(2-22)2-292-4 + -4.Wt(2-16)(2-23)2-30(2-23b)2-32(2-23d)(2-21)

  • a) b) 5. ()w = q um:(2-23a)2-31(2-23c)2-33(2-23e)2-35

  • 2-7 (2-16)(2-23)

  • --steam turbinegas turbine

  • (compressorpump)

  • (heat exchanger: boilerheater) q

  • 01kgz, z =0q =0 wi =0

  • 2-2 (P41)P492-4 (P43) (P51) 2-3P42P50

  • ---

  • ---p-v12

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