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5 June, 12:47

1.08 lbm of water fills a container whose volume is 2.08 ft3. The pressure in the container is 100 psia. Calculate the total internal energy and enthalpy in the container. Use data from the steam tables.

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  1. 5 June, 13:13
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    661 btu/lbm, 698 btu/lbm

    Explanation:

    solution:

    First the total specific volume of the mixture is determined from the mass and volume:

    α=V/m

    =2 ft^3/lbm

    Next, the quality of the mixture is obtained from the specific volumes of the constituents at the given pressure using data from:

    q = (α-α_liq100) / (α_vap-α_liq) 100

    = (2-0.01774) / (4.432-0.01774)

    =0.449

    Now the enthalpy and internal energy are determined from the quality:

    u=u_liq100+qu_evap100

    =661 btu/lbm

    h=h_liq100+qh_evap100

    =698 btu/lbm
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