Unit 1 Conduction, Convection & Radiation

10 lecture hours

• Conduction – Fourier’s law, thermal conductivity and its effect on temperature
• General heat conduction equation in Cartesian coordinates
• Boundary conditions
• Formulation of heat transfer problems through plane wall
• sphere & composite slab
• Critical and Optimum thickness of Insulation
• Convection: Mechanism
• Thermal and velocity boundary layers
• Convective heat transfer coefficient
• thermal boundary layers for the cases of flow over a flat plate and flow through pipe
• dimensionless numbers in heat transfer and their significance
• Correlations for heat transfer in laminar and turbulent flow for external and internal flows for constant heat flux and wall temperature conditions
• Analogy between momentum and heat transfer
• Radiation: Introduction
• Theories of radiation
• electromagnetic spectrum
• thermal radiation
• spectral emissive power
• surface emission
• - total emissive power
• Radiative properties
• reflectivity and transmissivity
• Concept of black and grey body
• radiation intensity
• Laws of black body radiation

Unit 2 Heat Exchangers

• Classification of heat exchangers
• concept of overall heat transfer coefficient
• LMTD and its correction factor
• Sizing and rating problem using LMTD method in parallel flow
• counter flow exchanger
• cross flow and multi -pass heat exchangers
• Temperature profile for single & multipass heat exchangers
• Shell and tube heat exchanger
• Important parts
• Double pipe heat exchangers
• Heat Exchanger Scale up, Condensers
• Evaporators- Single Effect & Multi effect evaporators
• Boiling – Boiling 10 Subject Code: 3163516