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    Heat Transfer : Steam and Aluminum

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    1: Steam at 100°C is passed into a condenser at a rate of 500 kg/h and leaves as water at 60°C. If the condenser is supplied with cooling water which enters at 20°C and leaves at 40°C, calculate:
    a) how much heat per hour is extracted from the steam.
    b) how much cooling water is needed per hour.

    2: A cupola furnace is charged with 100 kg of aluminium to be used for casting small components. The melting point of aluminium is 657°C, its specific heat capacity is 924 J/kg °C and its latent heat of fusion is 322 kJ/kg.
    Calculate the total heat energy which must be supplied to melt the aluminium if its initial temperature is 20°C.

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    TASK 1

    (a) Heat extracted from steam = Q = m s t
    M = 500 Kg = 500000 grams
    s = specific heat of steam = 0.48 calorie per gram per degree Celsius= 2.00928 joules per gram per degree Celsius
    t = 100 -60 = 40 degree Celsius
     M = 500000  2.00928  40 = 4.01856  107 Joules

    (b) cooling water needed per hour ;

    M = 4.01856  107 ...

    Solution Summary

    Heat transfer with regard to steam and aluminum is investigated.