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21 December, 11:49

Steam at 500 bar and 500°C undergoes a throttling expansion to 1 bar. What will be the temperature of the steam after the expansion? What would be the downstream temperature if the steam were replaced by an ideal gas, CP/R = 7/2?

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  1. 21 December, 12:14
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    T1=T2=500°C

    Explanation:

    Given-

    Pressure, P1 = 500 bar

    Temperature, T1 = 500°C

    P2 = 1 bar

    T2 after expansion, = ?

    We know,

    P1/T1 = P2/T2

    500 / 500 = 1/T2

    T2 = 1°C

    If the steam were replaced by an ideal gas, since enthalpy of ideal gas is a function of temperature only, we easily obtain T2 = T1 = 500°C
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