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A single-effect evaporator is used to concentrate 60000 kg h-1 of a 40 wt % NaOH solution which is fed to the evaporator at 40°C. The concentrated liquid is a 55 wt % NaOH solution. Saturated steam at 3 atm is available for heating. The vapor space in the evaporator is at a pressure of 10 kPa. The overall heat transfer coefficient is 2000 W m-2 K-1. Determine:
a) The amount of vapor produced.
b) The area required for the evaporator. Include clearly values of relevant properties.
c) The economy.
A tank contains cold water at a temperature Tc = 20°C and volume Vc = 1 m3. You add a volume Vh = 1 m3 of water at temperature Th = 100°C at time t = 0. Energy is lost from the tan
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