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1. a. Explain the terms (i) steam economy (ii) vapour recompression. b. A single-effect evaporator is being used to concentrate 10,000 kg/h of tomato juice from 5% total solids to 30% total solids. The juice enters the evaporator at 15°C. The evaporator is operated with steam (80% quality) at 143.27 kPa. The vacuum inside the evaporator allows the juice to boil at 75°C. Calculate (a) the steam requirements and (b) steam economy for the process. Assume the condensate is discharged at 75°C. The specific heat of the liquid feed is 4.1kJ/(kg°C) and the concentrated product is 3.1kJ/(kg°C).

1. a. Explain the terms (i) steam economy (ii) vapour recompression. b. A single-effect evaporator is being used to concentrate 10,000 kg/h of tomato juice from 5% total solids to 30% total solids. The juice enters the evaporator at 15°C. The evaporator is operated with steam (80% quality) at 143.27 kPa. The vacuum inside the evaporator allows the juice to boil at 75°C. Calculate (a) the steam requirements and (b) steam economy for the process. Assume the condensate is discharged at 75°C. The specific heat of the liquid feed is 4.1kJ/(kg°C) and the concentrated product is 3.1kJ/(kg°C).

Introduction to Chemical Engineering Thermodynamics
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
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1. a. Explain the terms (i) steam economy (ii) vapour recompression. b. A single-effect evaporator is being used to concentrate 10,000 kg/h of tomato juice from 5% total solids to 30% total solids. The juice enters the evaporator at 15°C. The evaporator is operated with steam (80% quality) at 143.27 kPa. The vacuum inside the evaporator allows the juice to boil at 75°C. Calculate (a) the steam requirements and (b) steam economy for the process. Assume the condensate is discharged at 75°C. The specific heat of the liquid feed is 4.1kJ/(kg°C) and the concentrated product is 3.1kJ/(kg°C).
Transcribed Image Text:1. a. Explain the terms (i) steam economy (ii) vapour recompression. b. A single-effect evaporator is being used to concentrate 10,000 kg/h of tomato juice from 5% total solids to 30% total solids. The juice enters the evaporator at 15°C. The evaporator is operated with steam (80% quality) at 143.27 kPa. The vacuum inside the evaporator allows the juice to boil at 75°C. Calculate (a) the steam requirements and (b) steam economy for the process. Assume the condensate is discharged at 75°C. The specific heat of the liquid feed is 4.1kJ/(kg°C) and the concentrated product is 3.1kJ/(kg°C).
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