Question

Two products enter an indirect contact heat exchanger that uses steam for heating. The first product which contains 15% solids enters at the rate of 3 kg/hr and at 10 °C. The second stream which contains 20% solids enters at the rate of 4 kg/hr and at 20 °C. Saturated steam at 140 °C enters the heat exchanger at 0.5 kg/hr with a quality of 95% and exits at 10% quality at 140 °C. The resulting mixture enters an indirect contact cooler. Water enters the indirect contact cooler at a temperature of 10 °C and exits at 25 °C. Two product streams exit the cooler. The first stream contains 25% solids and exits at 2 kg/hr and at 30 °C. If the second stream exits at 40 °C, write down all the equations (including those to determine specific heats

and enthalpies) that can be used to determine:

a. The temperature of the product entering the cooler

b. The mass flow rate of the cold water cp (solids) = 4000 J/kg
K

cp (water) = 4200 J/kg K

DO NOT SOLVE THE EQUATIONS. Just need help setting up equations. Thanks!

Answer #1

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