Question

A solution containing 10% by weight of NaOH is concentrated in a single effect evaporator with a flow rate of 5000 kg/hr. Atmospheric pressure at the evaporation site is 100.5kPa. The supply current enters the system at 355 K. The solution showing a boiling point elevation (KNY) of 55 K boils in the evaporator at 403 K. The saturated steam used as the heating medium is at a gauge pressure of 516.8 kPa. The temperature at which the condensate leaves the heating chamber is 368 K. The overall heat transfer coefficient of the system is given as 2558 W/m2.K and the specific heat of the overheated solvent vapor is given as 1.926 kJ/kg.K. a. Calculate the amount of concentrated solution and solvent vapor. b. Calculate the heating vapor consumption and heat transfer area. c. How many kPa is the vacuum applied to the system?

          A solution containing 10% by weight of NaOH is concentrated in a single effect evaporator with a
flow rate of 5000 kg/hr. Atmospheric pressure at the evaporation site is 100.5kPa. The supply
current enters the system at 355 K. The solution showing a boiling point elevation (KNY) of 55 K
boils in the evaporator at 403 K. The saturated steam used as the heating medium is at a gauge
pressure of 516.8 kPa. The temperature at which the condensate leaves the heating chamber is
368 K. The overall heat transfer coefficient of the system is given as 2558 W/m2.K and the
specific heat of the overheated solvent vapor is given as 1.926 kJ/kg.K.
a. Calculate the amount of concentrated solution and solvent vapor.
b. Calculate the heating vapor consumption and heat transfer area.
c. How many kPa is the vacuum applied to the system?

A solution containing 10% by weight of NaOH is concentrated in a single effect evaporator with a
flow rate of 5000 kg/hr. Atmospheric pressure at the evaporation site is 100.5kPa. The supply
current enters the system at 355 K. The solution showing a boiling point elevation (KNY) of 55 K
boils in the evaporator at 403 K. The saturated steam used as the heating medium is at a gauge
pressure of 516.8 kPa. The temperature at which the condensate leaves the heating chamber is
368 K. The overall heat transfer coefficient of the system is given as 2558 W/m2.K and the
specific heat of the overheated solvent vapor is given as 1.926 kJ/kg.K.
a. Calculate the amount of concentrated solution and solvent vapor.
b. Calculate the heating vapor consumption and heat transfer area.
c. How many kPa is the vacuum applied to the system?

Added by Josefina N.

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