Heat exchangers

Dynaflow Lecture,March 11th 2010,

Johan van der Kamp

Bronswerk Heat Transfer BVDynamic Heat Exchange Solutions

Mission:To provide solutions for challenges in heat transfer and fluid-flow systems

Definition of heat exchanger

A heat exchanger is a device in which heat (energy) is transferred from a hot fluid to a colder fluid; the fluids are separated by a wall so that they can not mix.

A Water to air heat exchanger

Plate & Frame heat exchanger

Shell & Tube Heat Exchanger

Air heater or air cooler element

Air cooled heat exchanger

Compact heat exchanger

Energy (heat) transferred, Q [W]Heat Transfer Coëfficiënt, k [W/m2.K]Heat transfer area, A [m2]Local temp diff between two fluids, dT [K]Local: Q = k * A * dT

Energy (heat) transferred, Q [W]

For the total heat exchanger:Q = k * A * LMTD

Log mean temp difference [K]

)}/()ln{()()(

tiTutuTitiTutuTiLMTD−−−−−

=

Heat Transfer Coefficient

⎟⎠⎞

⎜⎝⎛ ++++

=

iRi

diduRu

u

k

αλδ

α1*1

1

Thermal design

HTRI, Heat Transfer Research Institute,HTFS, Heat Transfer & Fluid flow Service, part of ASPEN.

Fundamental Research on heat transferResearch papers, handbook sheets, manualsComputer programs

DesignRating / checkingSimulation

Flow modelling

CFD, Computational Fluid Dynamics, (EFD), Engineering Fluid Dynamics

Fluid flow,Heat transfer,

Very time consuming on in- and output,And high calculation times

Flow modelling

Mechanical Design

Code calculationsUS: ASME VIII Div 1 & 2,Europe: PED 97/23/EC

Stoomwezen regelsBritish StandardsADMerkblaetterCodap etc.

Russia: Gost-RChina: Press vess Code

Mechanical Design

CustomersspecificationsStandards of the TEMAAPI

Finite element calculations

Finite element calculations

Finite element calculations

END

Thank you