8. A standard calandria type of evaporator with 100 tubes, each 1 m long, is used to evaporate fruit juice with approximately the same thermal properties as water. The pressure in the evaporator is 80 kPa absolute, and in the steam jacket 100 kPa absolute. Take the tube diameter as 5 cm. Estimate the rate of evaporation in the first evaporator. Assume the juice enters at 18°C and the overall heat transfer coefficient is 440 J m-2 s-1.
°C-1.
[ 72.5 kgh-1 ]