Topic: Evaporation | Heat Transfer - Video Lectures

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  Course Summary:
  Quick Review of Theory and Solving Representative Problems on Heat Transfer covering the undergraduate chemical engineering syllabus, and latest GATE-exam syllabus: Conduction - Resistance in Series and Parallel, Critical Radius of Insulation, Extended Surfaces, Unsteady Heat Conduction, Convection - Free and Forced Convection, Condensation, Boiling, Evaporation, and Radiation.
  
  Objective Type Questions and Problems with Detailed Solutions (60 nos.) - Video Lectures with Handwritten-Transcripts
  
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  Questions from Past GATE Exams CH, ME streams, and Standard Textbooks such as Cengel, Incropera, Ozisik, etc.
  
  Videos: 11 hours of recorded lectures - 2.5 hours of Theory; 8.5 hours of Problem Solving
  
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Evaporation

Select activity Evaporator Capacity and Economy
Evaporator Capacity and Economy Page

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Mark as done
2011-38-ht
An aqueous sodium chloride solution (10 wt%) is fed into a single effect evaporator at a rate of 10000 kg/h. It is concentrated to a 20 wt% sodium chloride solution. The rate of consumption of steam in the evaporator is 8000 kg/h. The evaporator capacity (kg/h) and economy are

5000, 0.625

10000, 0.625

5000, 1.6

10000, 1.6

Steam Economy and Area of Evaporator Page

2000-22-ht

An aqueous solution of a solute is concentrated from 5% to 20% (mass basis) in a single-effect short-tube evaporator. The feed enters the evaporator at a rate of 10 kg/s and at a temperature of 300 K. Steam is available at a saturation pressure of 1.3 bar. The pressure in the vapor space of the evaporator is 0.13 bar and the corresponding saturation temperature of steam is 320 K. If the overall heat transfer coefficient is 5000 W/(m\(^2\).K), calculate the:

steam economy (%).
heat transfer surface area (m\(^2\)).

	Enthalpy (kJ/kg)	Heat of vaporization (kJ/kg)
Saturated steam (1.3 bar; 380 K)	-	2000
Saturated steam (0.13 bar; 320 K)	2200	-
Feed (5% ; 300 K)	80	-
Concentrated liquor (20% ; 325 K)	400	-

Boiling point elevation is 5 K.

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Select activity Design of Evaporator

Design of Evaporator Page

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Select activity Steam Economy of Double Effect Evaporator

Steam Economy of Double Effect Evaporator Page

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Select activity Temperature of Double Effect Evaporator

Temperature of Double Effect Evaporator Page

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Select activity Multiple Effect Evaporation - Temperature in Each Effect

Multiple Effect Evaporation - Temperature in Each Effect Page

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Select activity Multiple Effect Evaporation - Type and Economy

Multiple Effect Evaporation - Type and Economy Page

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Topic outline

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Evaporation