Double Pipe HEAT EXCHANGERS with Finned Inner Tube

Slides:

Advertisements

Similar presentations

BESSEL’S EQUATION AND BESSEL FUNCTIONS:

Advertisements

Conduction Conceptests

More Ideas for Compact Double Pipe HXs P M V Subbarao Professor Mechanical Engineering Department I I T Delhi Ideas for Creation of Compact HX!!!

Design Analysis of Plate Heat Exchangers

Kern’s Description of Shell Side Flow in SHELL-AND-TUBE HEAT EXCHANGER P M V Subbarao Professor Mechanical Engineering Department I I T Delhi Another.

Heat Transfer Chapter 2.

MER Design of Thermal Fluid Systems

Analysis of Simple Cases in Heat Transfer P M V Subbarao Professor Mechanical Engineering Department I I T Delhi Gaining Experience !!!

Design of Systems with INTERNAL CONVECTION P M V Subbarao Associate Professor Mechanical Engineering Department IIT Delhi An Essential Part of Exchanging.

Jed Goodell Jesse Williams. Introduction Problem How much heat does a particular heat sink dissipate How many fins are needed to dissipate a specific.

CHE/ME 109 Heat Transfer in Electronics LECTURE 8 – SPECIFIC CONDUCTION MODELS.

Kern Method of SHELL-AND-TUBE HEAT EXCHANGER Analysis

P M V Subbarao Professor Mechanical Engineering Department I I T Delhi

Closure of Kern’s Method

Kern’s Description of Shell Side Flow in SHELL-AND-TUBE HEAT EXCHANGER

SHELL-AND-TUBE HEAT EXCHANGERS

Development in Double Pipe HEAT EXCHANGER for Concurrence & Better Economy! More New Geometric Ideas : Just for Economy !!! P M V Subbarao Professor Mechanical.

Correlations for INTERNAL CONVECTION P M V Subbarao Associate Professor Mechanical Engineering Department IIT Delhi An Essential Part of Exchanging Heat……..

One Dimensional Steady Heat Conduction problems P M V Subbarao Associate Professor Mechanical Engineering Department IIT Delhi Simple ideas for complex.

Solutions of the Conduction Equation P M V Subbarao Associate Professor Mechanical Engineering Department IIT Delhi An Idea Generates More Mathematics….

Optimal Fin Shapes & Profiles P M V Subbarao Associate Professor Mechanical Engineering Department IIT Delhi Geometrical Optimization is the Basic Goal.

Heat Convection : Cylinder in Cross Flow P M V Subbarao Associate Professor Mechanical Engineering Department IIT Delhi A Common Industrial Application.

Description can be an Imagination, but Action must be Real …… P M V Subbarao Professor Mechanical Engineering Department I I T Delhi Material Derivative.

Helical Double-tube HX P M V Subbarao Professor Mechanical Engineering Department I I T Delhi Ideas for Creation of Compact HX!!!

Kern Method of SHELL-AND-TUBE HEAT EXCHANGER Analysis

Hydraulic Analysis of STHE Using Bell Delaware Method

Thermo-economic Optimization of STHE P M V Subbarao Professor Mechanical Engineering Department I I T Delhi Minimizing capital and operating costs of shell.

Chapter 4.1: Design and Rating of Double Pipe Heat Exchangers.

Exergy Analysis of STHE P M V Subbarao Professor Mechanical Engineering Department I I T Delhi Formalization of Thermo-economics…..

ME421 Heat Exchanger and Steam Generator Design Lecture Notes 6 Double-Pipe Heat Exchangers.

One Dimensional Non-Homogeneous Conduction Equation P M V Subbarao Associate Professor Mechanical Engineering Department IIT Delhi Another simple Mathematical.

A Presentation on HEAT EXCHANGER DESIGN

1 MER Design of Thermal Fluid Systems Project 3 Heat Exchanger Optimization Professor Anderson Spring 2012.

Enhancement of Heat Transfer P M V Subbarao Associate Professor Mechanical Engineering Department IIT Delhi Invention of Compact Heat Transfer Devices……

Classification of Heat Exchangers P M V Subbarao Professor Mechanical Engineering Department I I T Delhi Creation of Variety in Anatomy of Heat Exchanger!!!

Large Shell Heat Exchangers P M V Subbarao Professor Mechanical Engineering Department I I T Delhi An Engineering Solution to the Crisis of Massive Volume.

The Family of Shell and Tube Heat Exchangers P M V Subbarao Professor Mechanical Engineering Department I I T Delhi Family members with Simple Geometrical.

Double Pipe HEAT EXCHANGERS with Finned Inner Tube P M V Subbarao Professor Mechanical Engineering Department I I T Delhi Ideas for Creation of Compact.

Heat Exchangers Heat exchangers are used to transfer heat from one stream to another. They are used to heat streams and to cool streams. The streams can.

Theory of Heat Exchanging P M V Subbarao Professor Mechanical Engineering Department I I T Delhi Understanding of Qualities of An Ideal Heat Exchangers…..

Heat Transfer from Extended Surfaces Heat Transfer Enhancement by Fins

Convection in Flat Plate Boundary Layers P M V Subbarao Associate Professor Mechanical Engineering Department IIT Delhi A Universal Similarity Law ……

One Dimensional Non-Homogeneous Conduction Equation P M V Subbarao Associate Professor Mechanical Engineering Department IIT Delhi Another simple Mathematical.

Differential Equations Linear Equations with Variable Coefficients.

Double Pipe HEAT EXCHANGERS with Low Thermal Resistance P M V Subbarao Professor Mechanical Engineering Department I I T Delhi Ideas for Creation of Isotropically.

Performance Analysis of Heat Exchangers P M V Subbarao Professor Mechanical Engineering Department I I T Delhi A First Step in Techno-Economics of HXs?!?!?!

Design and Analysis of Fins with Realistic Boundary Conditions P M V Subbarao Associate Professor Mechanical Engineering Department IIT Delhi Design for.

Concentric Tube (double-pipe) Heat Exchangers

Chapter 3: One-Dimensional Steady-State Conduction

Concurrent Engineering Aspects of HXs

Extended Surface Heat Transfer

Heat Exchanger Analysis

Concentric Tube (double-pipe) Heat Exchangers

More Non-Dimensional Models for Simple Heat Exchangers

P M V Subbarao Professor Mechanical Engineering Department I I T Delhi

Parametric Study of STHE Design

Heat Exchangers Heat Exchangers.

Heat Transfer from Extended Surfaces (Fins)

Study of Denominated Linear SO-ODEs

P M V Subbarao Professor Mechanical Engineering Department I I T Delhi

Modification of Capacity Ratio in Simple HXs

Variation of Fluid Temperature in Heat Exchangers

What are Fins ? Fins are extended surfaces used to increase the rate of heat transfer. It is made of highly conductive materials such as aluminum.

Temperature Profiles in Heat Exchangers

Performance Analysis of Heat Exchangers

SHELL-AND-TUBE HEAT EXCHANGERS

Heat Exchangers 2.

P M V Subbarao Professor Mechanical Engineering Department I I T Delhi

Dual Induction theory for Wind Turbines

Analysis of Reheat Rankine Cycle

Presentation transcript:

Double Pipe HEAT EXCHANGERS with Finned Inner Tube P M V Subbarao Professor Mechanical Engineering Department I I T Delhi Ideas for Creation of Compact HX!!!

How to decide the height of fin for a Double Pipe HX ?

nth order Longitudinal Fins x=a=0 b x=b x qb L b qb x=b x=a=0 x

Accounting of Heat Transfer due to Fins h, should be resulting heat transfer coefficient on annulus side. Fins with surface area, Afin, communicate as much as heat as an area of tube surface equal to hfinAfin . Therefore, the total annulus side effective area is Atube + hfinAfin. The ratio of total surface area to effective surface area is called as overall finned tube efficiency factor.

Performance of Least Material Fin Strip fin Triangular fin Parabolic fin

Effective annulus side overall heat transfer coefficient: Overall Heat Transfer coefficient of finned Double tube HX:

Performance of Least Material Strip Fin Optimum shape for a given qb & qb And solve for Ap with [ tanh (1.4192) = 0.8894 ]

Triangular Fin : Adiabatic Tip The particular solution for is: The fin heat dissipation is: The fin efficiency is:

Triangular Fin : Adiabatic Tip

Optimum Shape (Minimum Material) for Triangular Fin

Longitudinal Fin Of Concave Parabolic Profile The differential equation for temperature excess is an Euler equation: L b qb x=b x=a=0 x

Optimum Shapes (Least Material) of Parabolic Profile qb x=b x=a=0 x The heat dissipated is: And the efficiency is:

Double Pipe HX with finned inner Tube Equivalent diameter of annulus heat transfer, De:

Longitudinally Welded strip fins

Accounting of Heat Transfer due to strip Fins h, should be resulting heat transfer coefficient on annulus side. Fins with surface area, Afin, communicate as much as heat as an area of tube surface equal to hfinAfin . Therefore, the total annulus side effective area is Atube + hfinAfin. The ratio of total surface area to effective surface area is called as overall finned tube efficiency factor.

Effective annulus side overall heat transfer coefficient: Overall Heat Transfer coefficient of finned Double tube HX: