Q2. In order to concentrate a stream of 1.25 kg/s CaCl2 solution with 5 wt% loading to a 25wt% concentrate, a single effect evaporator is used with overall heat transfer coefficient of 1.25 kW/m?K. The evaporator operates at atmospheric pressure and the feed enters at 300 K. Saturated steam at 400 K is used for heating. a) Draw a block diagram of the process and define the streams and units in the block diagram. Calculate: b) the boiling point elevation as K. c) the amount of concentrate and vapor produced as kg/s. d) the heat transfer area of the evaporator. e) the amount of steam used for heating as kg/s.
Q2. In order to concentrate a stream of 1.25 kg/s CaCl2 solution with 5 wt% loading to a 25wt% concentrate, a single effect evaporator is used with overall heat transfer coefficient of 1.25 kW/m?K. The evaporator operates at atmospheric pressure and the feed enters at 300 K. Saturated steam at 400 K is used for heating. a) Draw a block diagram of the process and define the streams and units in the block diagram. Calculate: b) the boiling point elevation as K. c) the amount of concentrate and vapor produced as kg/s. d) the heat transfer area of the evaporator. e) the amount of steam used for heating as kg/s.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:Q2. In order to concentrate a stream of 1.25 kg/s CaCl2 solution with 5 wt% loading to a
25wt% concentrate, a single effect evaporator is used with overall heat transfer coefficient of
1.25 kW/m?K. The evaporator operates at atmospheric pressure and the feed enters at 300 K.
Saturated steam at 400 K is used for heating.
a) Draw a block diagram of the process and define the streams and units in the block
diagram.
Calculate:
b) the boiling point elevation as K.
c) the amount of concentrate and vapor produced as kg/s.
d) the heat transfer area of the evaporator.
e) the amount of steam used for heating as kg/s.
Calcium Chloride Water Solution - Specific Heat
4500
Specific Heat
4000
3500
3000
LThe Engineering ToolBox
www EneneeringTeoeox.com
2500
10
20
30
40
Concentration by mass (%)
Figure Q2-a. Specific heat of aqueous CaClz solution
Specific Heat (Jkg K)
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