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What is the value of final enthalpy if the enthalpies before mixing were 50 and 28 kJ / kg of dry air respectively and m2 / m1 = 2?

What is the value of final enthalpy if the enthalpies before mixing were 50 and 28 kJ / kg of dry air respectively and m2 / m1 = 2? Correct Answer 38.67

For energy balance, m1 h1 + m2 h2 = m3 h3 m3 = m1 + m2 So, m1 h1 + m2 h2 = (m1 + m2) h3 m1 / m2 = h3 – h2 / h1 – h3 0.5 = h3 – 28 / 50 – h3 50 – h3 = 2h3 – 56 3h3 = 50 + 56 = 116 h3 = 38.67.

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