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Join Date: Jun 2012
Posts: 10

Overall Heat Transfer Coefficient of LPG

08/31/2012 11:16 PM

Hi everyone,

How to calculate overall heat transfer coefficient of LPG (40%Propane and 60% Butane).?

And also how to calculate heat loss of 6 inch pipe having ambient temperature of 60degree celcius and fluid temp.45degree celsius.

Total Heat transfer=mCp(T2-T1)=223.725 Joule

Also suggest minimum insulation thickness of pipe to transfer heat of 223.725 during 12 hours

Regards,

Shrikant

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#1

Re: Overall heat transfer coefficient of LPG

08/31/2012 11:37 PM

http://e-nett.sut.ac.th/pdf%5CENETT49-109.pdf

Vaporization of LPG by ambient air

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#2

Re: Overall Heat Transfer Coefficient of LPG

09/03/2012 4:06 AM

With those temperatures, there will be a heat gain, not a heat loss.

Surely this installation's operating company has a piping insulation standard that must be followed?

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#3

Re: Overall Heat Transfer Coefficient of LPG

09/03/2012 2:08 PM

Dear Mr. srikanth45,

Your question is not clear. Can you clearly spell it or elaborate it. What I presume or infer from your point is WHAT IS THE AMOUNT OF HEAT LIBERATED and your equation is the total heat involved for which it can be calculated from Analysis of the LPG.

Over-All Heat Transfer Co-Efficient is involved where one Heating Medium and another Medium to be heated - where HEAT TRANSFER IS COMPULSORY. It can be LIQUID to LIQUID or AIR/GAS to LIQUID or AIR/GAS to AIR/GAS. Here the HEAT LOSS = HEAT GAIN is the BASIS, and LG MEAN TEMPERATURE IS INVOLVED. The Temperatures, Flow rate, Material of the Heat Exchanger, Circulation Rate etc. are involved.

Regardiing insulation, what is the Standard are Radiation is PERMISSIBLE, based on that we can find out.

Let other CR4 MEMBERS also post their views.

Thanks,

DHAYANANDHAN.S

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