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4 August, 07:55

Steam enters and leaves a horizontal 1D pipe steadily at a constant speed with the specific enthalpy to be 4000 kJ/kg and 1500 kJ/kg respectively. Assuming a mass flow rate of 0.5 kg/sec and If there is no significant change in potential energy from inlet to exist, determine the rate of heat transfer between the pipe and its surroundings.

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  1. 4 August, 08:18
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    The rate of heat transfer between pipe and its surrounding is found to be 1250 KW

    Explanation:

    Assuming no significant change in potential energy. When we apply the first law of thermodynamics to the given system of 1-D pipe, we get the following expression:

    Q = m (h₁ - h₂)

    where,

    Q = Heat Transfer between pipe and surrounding = ?

    m = mass flow rate of steam = 0.5 kg/sec

    h₁ = Specific Enthalpy of steam at entrance = 4000 KJ/kg

    h₂ = Specific Enthalpy of steam at exit = 1500 KJ/kg

    Therefore, using these values in the equation, we get the value of heat transfer:

    Q = (0.5 kg/sec) (4000 KJ/kg - 1500 KJ/kg)

    Q = 1250 KW
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