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Q1. A forward-feed double-effect evaporator, having 10 m2 of heating surface in each effect, is used to concentrate 1 kg/s of caustic soda solution from 10 per cent by mass to 30%. During a particular run, when the feed is at 373 K the pressures in the t wo calandrias are 375

Q1. A forward-feed double-effect evaporator, having 10 m2 of heating surface in each effect, is used to concentrate 1 kg/s of caustic soda solution from 10 per cent by mass to 30%. During a particular run, when the feed is at 373 K the pressures in the t wo calandrias are 375

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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Q1. A forward-feed double-effect evaporator, having 10 m2 of heating surface in each effect, is used to concentrate 1 kg/s of caustic soda solution from 10 per cent by mass to 30%. During a particular run, when the feed is at 373 K, the pressures in the two calandrias are 375 and 180 kN/m2 respectively, while the condenser operates at 30 kN/m². For these :conditions, calculate .the load on the condenser (a) the steam economy (b) the overall heat transfer coefficient in each (c) .effect Would there have been any advantages in using backward feed in this case? Heat losses to the .surroundings are negligible
Transcribed Image Text:Q1. A forward-feed double-effect evaporator, having 10 m2 of heating surface in each effect, is used to concentrate 1 kg/s of caustic soda solution from 10 per cent by mass to 30%. During a particular run, when the feed is at 373 K, the pressures in the two calandrias are 375 and 180 kN/m2 respectively, while the condenser operates at 30 kN/m². For these :conditions, calculate .the load on the condenser (a) the steam economy (b) the overall heat transfer coefficient in each (c) .effect Would there have been any advantages in using backward feed in this case? Heat losses to the .surroundings are negligible
:Physical properties of caustic soda solutions Specific Boiling Heat of heat point Concentration dilution, сарacity rise % wt kJ/kg kJ/kg K deg K 3.85 1.6 10 2.3 3.72 6.1 20 9.3 3.64 15.0 30 2.2 3.22 41.6 50
Transcribed Image Text::Physical properties of caustic soda solutions Specific Boiling Heat of heat point Concentration dilution, сарacity rise % wt kJ/kg kJ/kg K deg K 3.85 1.6 10 2.3 3.72 6.1 20 9.3 3.64 15.0 30 2.2 3.22 41.6 50
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