18CH45 Process Heat Transfer syllabus for CH

INTRODUCTION:

Various modes of heat transfer Viz. Conduction, Convection and Radiation.

CONDUCTION:

Fourier’s law, Steady state unidirectional heat flow through single and multiphase layers slabs, cylinders and spheres for constant and variable thermal conductivity.

INSULATION:

Properties of insulation materials, Types of insulation, Critical and Optimum thickness.

EXTENDED SURFACES:

Fins – Types of fins, Derivation of fin efficiency for longitudinal fins, Fin effectiveness, Elementary treatment of unsteady state heat conduction.

CONVECTION:

Individual and overall heat transfer coefficient, LMTD, LMTD correction factor, Dimensionless numbers, Dimensional analysis, Empirical correlation for forced and natural convection.

ANALOGY:

Analogy between momentum and heat transfer- Reynolds, Colburn and Prandtl analogies.

HEAT TRANSFER WITH PHASE CHANGE:

Boiling phenomena, Nucleate and Film boiling, Condensation - Film and Drop wise condensation, Nusselts equations.

HEAT TRANSFER EQUIPMENT:

Double pipe heat exchangers, Shell and tube heat exchangers – Types of shell and tube heat exchangers, Construction details, Condenser, types of condensers

DESIGN OF HEAT TRANSFER EQUIPMENT:

Elementary design of double pipe heat exchanger, shell and tube heat exchangers and condensers. Numerical Problems.

EVAPORATORS:

Types of evaporators, performance of tubular evaporator – Evaporator capacity, Evaporator economy, Multiple effect evaporator – Methods of feeding, effect of liquid head and boiling point elevation.

RADIATION:

Properties and definitions, Absorptivity, Reflectivity, Emissive power and intensity of radiation, Black body radiation, Gray body radiation, Stefen – Boltzmann law, Wein’s displacement law, Kirchhoff’s law.

Course Outcomes:

On successful completion of this course students will be able to

• Comprehend basic laws of HT and derive steady state expression for determination of temperature distribution and heat conduction in different geometries
• Determine critical thickness of insulation and efficiency of extended surfaces
• Derive and determine LMTD, overall heat transfer coefficient & temperature distribution under unsteady-state heat conduction
• Establish the analogy between momentum and heat transfer and describe pool boiling regimes
• Explain construction and working principle of heat exchangers and concepts of radiation
• Comprehend significance of Dimensionless numbers in heat transfer coefficient calculation, HT equipment design and explain working principle of evaporators and apply principles of dimensional analysis

QUESTION PAPER PATTERN:

• The question paper will have ten questions.
• Each full Question consisting of 20 marks 31
• There will be 2 full questions (with a maximum of four sub questions) from each module.
• Each full question will have sub questions covering all the topics under a module.
• The students will have to answer 5 full questions, selecting one full question from each module.

TEXT BOOKS:

1. Kern D.Q., “Process Heat Transfer”, McGraw Hill., New York, 1965

2. McCabe W.L., et.al., “Unit Operations of Chemical Engineering”, 5thedn., McGraw Hill, New York, 2000

3. Coulson J.M. and Richardson J.F., “Unit Operations of Chemical Engineering”, Vol-I, 5thedn., Chemical Engg, Pergamon & ELBS, McGraw Hill, New York, 2000

REFERENCES:

1. Rao Y.V.C., “Heat Transfer”, 1stedn. Universities Press (India) Ltd., New Delhi, 2001.

2. Dutta, Binay K., “Heat Transfer: Principles and Applications”, PHI Learning. 2000