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Heat Exchangers


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#1 chakrabortyp2

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Posted 19 June 2005 - 01:10 AM

Dear All,

I know it's a bit elementary to most of you.

Is there any thumb rule to estimate (approx) heat exchanging surface are for tubular exchangers ? Like, say, for a 900 mm OD X 6 Mt shell, approx area will be 102 sq. m.

I do understand that surface area will have relation to no. of tubes/tubes size (OD/ID/length) etc. . However a thumb-rule sort of thing for standard sizes (for a refinery) will be highly apprecieted.

With best regards


Chakra

#2 Art Montemayor

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Posted 20 June 2005 - 10:04 AM

Chak:

I've never seen or heard of such a "rule of thumb" in 45 years spent in the industry. I doubt if anyone has spent any time in trying to come up with one. There are just too many variables and conditions that have to be pre-set in order to have any value:

1. The type of exchanger - TEMA type?
2. The length of the exchanger;
3. The diameter of the exchanger;
4. The tube diameter;
5. The number of tubes;
6. The number of passes;
7. The application.

What experienced engineers do is that they have memorized (through continued exposure) the nominal heat transfer area in some of the heat exchangers they are familiar with and use this experience as an estimate. This consumes some cranial memory space, but if you are daily working with heat exchangers, it may be worth the effort and the memory usage.

#3 Ming Hooi

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Posted 24 June 2005 - 11:38 PM

I'm not an 'old' engineer. But I'm used to estimate heat exchanging area by multiplying the surface area of each tube with the number of tubes. For example, for a tubular heat exchanger with OD 0.050m, tube length 1.5m and 50 tubes (these are example figures), then I would estimate the heat exchange area to be roughly pi*0.050*1.5*50 squared meters as a hand calculation.

What could be wrong with the above?

#4

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Posted 31 August 2005 - 02:33 AM

As I thing the right name is shell and tube heat exchanger not tubular exchangers.
Also about the reqierd area

Q=UA(Delta T )log mean

and A =reqierd surface area for heat transfer

A=(pi * d * L)* N

d= out side dim.
L= pipe lenght
N=number of pipe

#5 sgkim

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Posted 31 August 2005 - 05:48 AM

Hi Chakra,

There would be no rule-of-thumbs for the estimation of surface area out of the diameter of shell and the length of tubesheet.

You probably want the file attached:
-Shell Diameter-vs-Surface Area
-Shell Diameter-vs-No. of Tubes

Stefano/050831

Attached Files






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