Question: Orange juice with 1 2 % solids is being heated by direct steam injection using steam at a pressure of 2 3 2 . 1

Orange juice with 12% solids is being heated by direct steam injection using steam at a pressure of
232.1 kPa. The product enters the heating system at 50C at a rate of 100 kg/min and is being heated
to 120C. The product specific heat is a function of composition as follows:
Cp = Cpwater(wwater)+ Cpsolids(wsolids)
Heat capacity of water at 50C is 4.178 kJ/kgC, at 120C 4.232 kJ/ kgC
Average heat capacity of solids 2.161 kJ/kgC
Determine the amount of steam and heat supplied by steam.

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