17CH45 Process Heat Transfer [ D. C] 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 transferReynolds, 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, Vapor recompression evaporation.

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, View factors, Radiation between surfaces, Radiation involving gases and vapors, Radiation shields.

COURSE OUTCOMES: The students will be able to do the following

1. Write all fundamental heat transfer relations.

2. Derive equations for the calculation of heat flux and estimation of intermediate temperatures in multilayer systems.

3. Calculate critical thickness of insulation requires for different geometry of solids.

4. Write different dimensionless numbers and explain their significance.

5. Estimate LMTD and heat transfer coefficients for different types of flows.

6. Design Shell and tube and double pipe heat exchanger, condensers and Evaporator.

7. Explain radiation in different type of solids and estimate emissivity.

Note: Use of steam tables permitted in examination and internal assessment test.

GRADUATE ATTRIBUTES:

• Problem analysis.
• Design/development of solutions.

QUESTION PAPER PATTERN:

• The question paper will have ten questions.
• Each full question is for 16 marks.
• There will be two 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 five 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”, VolI, 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. Dutta, Binay K., “Heat Transfer: Principles and Applications”, PHI Learning., 2000