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24 July, 08:47

Superheated water vapor at a pressure of 20 MPa, a temperature of 500oC, and a flow rate of 10 kg/s is to be brought to a saturated vapor state at 10 MPa in an open feedwater heater. This process is accomplished by mixing this stream with a stream of liquid water at 20oC and 10 MPa. What flow rate is needed for the liquid stream?

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  1. 24 July, 11:05
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    1.96 kg/s.

    Explanation:

    So, we are given the following data or parameters or information which we are going to use in solving this question effectively and these data are;

    => Superheated water vapor at a pressure = 20 MPa,

    => temperature = 500°C,

    => " flow rate of 10 kg/s is to be brought to a saturated vapor state at 10 MPa in an open feedwater heater."

    => "mixing this stream with a stream of liquid water at 20°C and 10 MPa."

    K1 = 3241.18, k2 = 93.28 and 2725.47.

    Therefore, m1 + m2 = m3.

    10 (3241.18) + m2 (93.28) = (10 + m3) 2725.47.

    => 1.96 kg/s.
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