Answer / harry

as thermal conductivity of fouling is low so it decrease
the heat transfer rate

Answer / praveen saurabh

due to fouling it add an extra heat resistance.as a result
it decrease the heat transfer rate.

Answer / mb

As intensity of fouling increases the resistance to Heat
transfer is idecreses as rate of heat transfer is
inversaly proportional to thickness

Answer / shravan kumar

Fouling increases the thickeness of the heat transfer
surface which results into a increased resistance to heat
transfer and hence the rate of heat transfer decreases.

Answer / prokash paul

Fouling increases the thickness of the heat transfer
surface. It add an extra heat resistances a result
it decrease the heat transfer rate.
Since rate of heat transfer is inversely proportional to the
thickness of the heat transfer surface and fouling increases
the thickness, therefore fouling decreases the heat
transfer rate.

Answer / rajasekhar

Fouling means accumilation of impurities in heat
exchangers,if fouling factor increases heat transfer rate
decreases.
Due to fouling tubes will corrode there won't be proper
heat exchange between hot and cold fluid.

Answer / eswar

as every chem people know abot it..as thickness of layer
increses heat resisitance increases...heat transfer rate is
lowerd....it is more observed in boilers....some times it
leads boiler accidents....bcoz of dis caustic embrittlement
occured mostly in boilers

Answer / umesh medhavale

Fouling is inversely propotional to Heat transfer rate,
fouling means impurities settel inside and outside of tube,
thats effect on heat transfer rate

Answer / vikrant kumar

Fouling is dirt materials deposit on heat trasfer
surface.Since its heat resistance value is high,So Heat
transfer rate will reduce after formation of fouling.

Answer / lokesh singh

h=k/d, where d is the thickness of wall across which heat
transfer takes place,if we increase d by anyway then
resistance to heat transfer is going to increase but i must
tell u one thing to you guys that i am a process design
engineer(basically chemical engineer) working since last 6-
7 year in the field of design, many time during heat
exchanger design, if we take fouling factor zero then we
get value of heat transfer coeficient less ( HTRI run) as
compaired to somewhat fouling surface, this means sometime
less fouling metal surface is giving added advantage of
heat transfer as compaired to smooth metal surface, this
reverse the above low about which everyone is talking(
inversly proportional), if any one have HTRI software then
he can run and cross check my point.

Why LMTD is calculated in Heat -Exchanger problems..Why dont we take average temperature??

4 Answers   Aker Solutions,

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1 Answers  

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0 Answers