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Introductionto

HEAT TRANSFERDepartment of Chemical

Engineering

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• HEAT: The energy in transit istermed HEAT

• HEAT TRANSFER: The transmissionof energy from one region to anotheras a result of temperature gradient.

• Driving potential: Temperaturedierence

• Temperature: The temperature is athermal state of a body which

distinguishes a hot body from a cold

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The study of heat transfer iscarried out for the folloingpurposes

•  To estimate the rate of ow of energyas heat through the boundary of asystem under study both under

steady and transient conditions!

•  To determine the temperature "eldunder steady and transient

conditions.

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Thermodynamics Heat Transfer

#t deals with the e$uilibriumstates of matter% and precludesthe e&istence of a temperaturegradient

#t is inherently a non'e$uilibriumprocess since a temperaturegradient must e&ist for e&changeof heat to ta(e place!

)hen a system changes from onee$uilibrium state to another%thermodynamics helps todetermine the $uantity of wor(and heat interactions. #t describeshow much heat is to bee&changed during a process butdoesn*t hint how the same couldbe achie+ed.

#t helps to predict the distributionof temperature and to determinethe rate at which energy istransferred across a surface ofinterest due to temperaturegradients at the surface anddierence of temperaturebetween dierent surfaces.

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,lant -ayout

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Areas co+ered

• Heating and cooling of uids etc. inchemical operations.

• efrigeration and air conditioning units.

•  Thermal and /uclear power plants – Heat engines

 – 0team generators

 – Condensers

 – Heat e&change e$uipments

 – Catalytic con+erters

 – 1urnaces etc

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,rocess E$uipment2s

• E+aporators

• Heat E&changers – 0hell and Tube HE3!4! #mages!

animation!

 – Double ,ipe HE images!

 – ,late and 1rame HE

 – 0piral HE5.. Etc!

http://var/www/apps/conversion/tmp/scratch_2/Animation%20Falling%20Film%20Evaporator%20-%20YouTube.MP4http://var/www/apps/conversion/tmp/scratch_2/SHELL%20AND%20TUBE%20HEAT%20EXCHANGER%20NEN-TYPE%20-%20YouTube.MP4http://var/www/apps/conversion/tmp/scratch_2/Shell%20and%20Tube%20Animation%20-%20Exchanger%20Industries%20Ltd%20-%20YouTube.MP4http://var/www/apps/conversion/tmp/scratch_2/Shell%20and%20Tube%20Animation%20-%20Exchanger%20Industries%20Ltd%20-%20YouTube.MP4http://var/www/apps/conversion/tmp/scratch_2/SHELL%20AND%20TUBE%20HEAT%20EXCHANGER%20NEN-TYPE%20-%20YouTube.MP4http://var/www/apps/conversion/tmp/scratch_2/Animation%20Falling%20Film%20Evaporator%20-%20YouTube.MP4

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0hell and Tube HE

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0hell and Tube HTAnimation

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Double ,ipe HE

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6ther HE

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Distillation

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7oilers and Condensers

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"odeof

HEAT TRANSFER

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#onvection

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Radiation

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 Three modes

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6b8ecti+es

• ,rinciples

• 9o+erning E$uations

•

Applications

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END