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27 June, 11:43

Refrigerant-134a enters the expansion valve of a refrigeration system at 160 psia as a saturated liquid and leaves at 30 psia. Determine the temperature and internal energy change across the valve.

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  1. 27 June, 14:32
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    Temperature : 92.9 F

    Internal Energy change: - 2.53 Btu/lbm

    Explanation:

    As

    mh1=mh2

    h1=h2

    In table A-11 through 13E

    p2=120Psi, h1 = 41.79 Btu/lbm,

    u1=41.49

    So T1=90.49 F

    P2=20Psi

    h2=h1 = 41.79 Btu/lbm

    T2 = - 2.43F

    u2 = 38.96 Btu/lbm

    T2-T1 = 92.9 F

    u2-u1 = - 2.53 Btu/lbm
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