06ME664-Design of Heat Exchangers |
PART – A |
UNIT I: |
INTRODUCTION TO HEAT EXCHANGER DESIGN: Types of heat
exchangers and their applications. Flow arrangements and temperature
distributions in transfer type of heat exchangers. Overall heat transfer
coefficient;- Clean overall heat transfer coefficient, dirt factor dirt overall
heat transfer coefficient, dirt factors for various process services. Basic
design equation. Mean temperature difference Concept: - LMTD for parallel
flow and counter flow arrangement, correction factor for LMTD for cross
flow and multi – pass heat exchangers.
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UNIT II: |
SHELL AND TUBE HEAT EXCHANGERS: Constructional features.
Applications. Effectiveness-NTU method for heat exchanger design/
analysis. Rating and sizing problem. Correlations for tube side pressure drop
and heat transfer coefficients. Pressure drop and heat transfer coefficient
correlations for shell side flow.
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UNIT III: |
EFFECT OF BY – PASS AND LEAKAGE CALCULATIONPROCEDURE FOR SHELL AND TUBE HEAT EXCHANGER: Heat
balance equations: LMTD: reference temperature calculations: evaluation of
fluid properties: flow assignments: tube side flow area calculations; viscosity
correction factor, shell side equivalent diameter, calculation of shell side heat
transfer coefficient, evaluation for wall temperature, evaluation of overall
heat transfer coefficient, Calculation of surface area. Calculations of tube side
and shell side pressure drops.
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UNIT IV: |
STEAM CONDENSERS: Specifications of other details as per TEMA
standards. Flow arrangement for increased heat recovery: - lack of heat
recovery in 1-2 exchangers true temperature difference in a 2-4 exchanger.
Calculation procedure for steam condensers.
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PART – B |
UNIT V: |
DOUBLE PIPE HEAT EXCHANGERS: Constructional features.
Applications. Design parameters :- tube side and shell side film coefficients
cut and twist factor, fin efficiency, overall heat transfer coefficient, mean
temperature difference, available surface area, fin geometry fin height,
number of fins, tube side and shell side pressure drop. Calculation procedure
for the design/ analysis of double pipe heat exchanger.
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UNIT VI: |
COMPACT HEAT EXCHANGERS: Introduction; definition of Geometric
Terms: plate fin surface geometries and surface performance data; correlation
of heat transfer and friction data; Goodness factor comparisons; specification
of rating and sizing problems; calculation procedure for a rating problem.
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UNIT VII: |
AIR-COOLED HEAT EXCHANGERS: Air as coolant for industrial
processes; custom-built units; fin-tube systems for air coolers; fin-tube
bundles; thermal rating; tube side flow arrangements; cooling air supply by
fans; cooling air supply in natural draft towers.
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UNIT VIII: |
FURNACES AND COMBUSTION CHAMBERS: Introduction; process
heaters and boiler; heat transfer in furnaces: - Heat source; Heat sink;
refractory surfaces; heat transfer to the sink; Design methods: - Method of
Lobo and Evans: Method of Wilson, Lobo and Hottel; The Orrok-Hudson
equation; Wallenberg simplified method.
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REFERENCE |
TEXT BOOKS: |
1. Process Heat Transfer: Donald Q. Kern, Tata McGraw –Hill
Edition (1997)
2. Compact Heat Exchangers: W. M. Kays & A. L. London, Mcgraw –Hill co. (1997)
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Reference Books |
1.Heat Transfer – A Basic Approach: Necati Ozsisik,McGraw –Hill International edition (1985).
2. Heat Exchanger Design Hand Book: Volumes 2 and 3, edited by
Ernst U schlunder. et. al Hemisphere Publishing Co. (1983)
3. Heat exchanger- Kokac Thermal- hydraulic and design analysis.
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