A 20% (by wt) sodium hydroxide solution is being concentrated to 50% (by weight) using an evaporator at 311 K. The saturated steam used for heating is 399.3 K. The pressure in the vapor space of the evaporator is 13.3 kPa abs. If the overall heat transfer coefficient is 1420 W/m2-K and the area is 86.4 m2, calculate the feed rate of the evaporator.

A 20% (by wt) sodium hydroxide solution is being concentrated to 50% (by weight) using an evaporator at 311 K. The saturated steam used for heating is 399.3 K. The pressure in the vapor space of the evaporator is 13.3 kPa abs. If the overall heat transfer coefficient is 1420 W/m2-K and the area is 86.4 m2, calculate the feed rate of the evaporator.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.29P

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An evaporator is concentrating F kg/hr at 311K of a 20 wt % solution of NaOH to 50%. The saturated steam used for heating is at 399.3 K. The pressure in the vapor space of the evaporator is 13.3 kPa abs. The overall coefficient is 1420 W/. K and the area is 86.4 square meters. Calculate the feed rate F of the evaporator.
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