A forward-feed double-effect evaporator, having 10 m2 of heating surface in each effect, is used tokgconcentrate 1 of caustic soda solution from 10 per cent by mass to 30%. During a particular run,kNwhen the feed is at 373 kelvin (K), the pressures in the two calandrias are 375 and 180-respectively,m2while the condenser operates at 30m2kNFor these conditions, calculate:(a) the load on the condenser.(b) the steam economyc) the overall heat transfer coefficient in each effect. Would there have been any advantages in usingbackward feed in this case? Heat losses to the surroundings are negligible.ConcentrationBoiling point riseSpecific heat capacityHeat of dilution, kJ/kgwt %deg KkJ/kg K101.63.856.13.722.33015.03.649.35041.63.222.220

From given Dataλ0=2141 kJ/kgλ1=2211 kJ/kgλ2=2370 kJ/kgMaking heat balance around stage…

A forward-feed double-effect evaporator, having 10 m? of heating surface in each effect, is used to kg of caustic soda solution from 10 per cent by mass to 30%. During a particular run, concentrate 1 kN when the feed is at 373 kelvin (K), the pressures in the two calandrias are 375 and 180 respectively, while the condenser operates at 30 kN For these conditions, calculate: m2 (a) the load on the condenser. (b) the steam economy c) the overall heat transfer coefficient in each effect. Would there have been any advantages in using backward feed in this case? Heat losses to the surroundings are negligible. Concentration Boiling point rise Specific heat capacity Heat of dilution, kJ/kg wt % deg K kJ/kg K 10 1.6 3.85 20 6.1 3.72 2.3 30 15.0 3.64 9.3 50 41.6 3.22 2.2

A forward-feed double-effect evaporator, having 10 m? of heating surface in each effect, is used to kg of caustic soda solution from 10 per cent by mass to 30%. During a particular run, concentrate 1 kN when the feed is at 373 kelvin (K), the pressures in the two calandrias are 375 and 180 respectively, while the condenser operates at 30 kN For these conditions, calculate: m2 (a) the load on the condenser. (b) the steam economy c) the overall heat transfer coefficient in each effect. Would there have been any advantages in using backward feed in this case? Heat losses to the surroundings are negligible. Concentration Boiling point rise Specific heat capacity Heat of dilution, kJ/kg wt % deg K kJ/kg K 10 1.6 3.85 20 6.1 3.72 2.3 30 15.0 3.64 9.3 50 41.6 3.22 2.2

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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