10 replies to this topic

[AFFAN]

hi friendz i am to design a sample cooler with superheated steam coming in at tube side (coils) at 550^C and 131 bar a, to be cooled to 45^c, steam flow rate is just 50 lit/hr, cooling water at shell side is coming at 30^c and leaving at 40^C.. flow rate required is approx 130 kg/hr..
steam while cooling going through three stages "Desuperheating, Condensation, & sub cooling.
but wall temp is too far below the saturation temp. so we can well assume that desuper heating can be neglected
plz suggest me some specific type of corelations to be used for coil type steam cooler to calculate its heat transfer coefficients and pressure drop calculations..
should i use the routine procedures to calculate the heat transfer calculations or there ARE SOME SPECIFIC CORELATIONS AVAILABLE FOR COIL TYPE COOLER CALCULATIONS????
PLZ Suggest keeping in mind the very low flow rates and velocity constraints.

[Padmakar Katre]

Dear,
Just find some useful information related to your query in the following links,

http://www.neptune1....mpleCoolers.pdf
http://www.spiraxsar...p...2&sec_ref=6
http://www.spiraxsar.../sb/P403_05.PDF

[AFFAN]

HI
the said sites definitely contain some useful information, but as such no specific correlations are given there for Sample coolers
i am looking for design information about sample coolers, in which super heated steam is coming in and leaving as sub cooled liquid

In this regard plz suggest me some useful literature or information

Best regards

[AFFAN]

HI FRIENDZ


ME STILL WAITING FOR ANY SAMPLE COOLER DESING CORRELATIONS OR GUIDELINES OR ANY REFERENC LITERATURE PLZ...

[pleckner]

First, check Perry's Chemical Engineeirng Handbook.

Check the book Process Heat Transfer by Kern

Do a Google search on "sample coolers".

Try this link for a very good free book on heat transfer: http://web.mit.edu/l...d/www/ahtt.html

See if you can get a hold of this article:

P. K. Ramachandra, B. W. Shende, P. K. Ghosh, "Deisgning a helical-coil Heat Exchanger", Chemical Engineering, December 13, 1982

Why not just buy a sample cooler from one of the vendors already referenced to you?

[AFFAN]

Dear Sir

Thks for your answer, i have tried the first three options listed in your reply, but hardly i can find any thing specifically relevent.

Plz if you can send me the article, you have just mentioned in your mail, bcz here i have no archive folders...

waiting..

Best Regards

[Art Montemayor]

Affan:

Phil Leckner is correct in his recommendations – especially the last one. Why do you insist on getting involved in the design of such a small heat transfer apparatus? No one in industry does it because it winds up being a waste of time and effort. It is such a small item and it is readily available from suppliers who make it their business to design these items in large quantities. Just fill in a specification sheet and submit it to the selected supplier.

Some suppliers I was able to find in the Internet in just under 5 minutes are:

1) Sentry Equipment Corp
966 Blue Ribbon Circle North
PO Box 127
Oconomowoc, WI 53066 USA
Telephone: 262.567.7256
Fax: 262.567.4523
http://www.sentry-eq...mpleCoolers.htm

2) Gestra Sample Coolers
http://www.ibhs.co.u...S...58&P_ID=391

3) Graham Heliflow Exchanger (for larger flow rates and better process control)
http://www.graham-mf...m/heliflow.html

No one in his right mind is going to calculate heat transfer coeffficients for a sample de-superheater that is going to wind up being around 1 m² in total surface area - unless they are college professors who have nothing better to do than to study the possibilities of them doing it successfully.

[pleckner]

Sorry, copyrighted article and I cannot legally distribute it.

Do what Art says!

[AFFAN]

hi Art
thks for references of sites u sent to me, really it takes less than minutes to search for such sites,
if u happened to focus on my question, i never asked for these?

i was looking to desigin it myself, bcz it was my assignment to do so, and i think in matter of designing size and values smaller or bigger does not matter, infact the smaller the thing the more difficult are the issues to handle...

so if you dont know any useful info on the relevent topic, never mind, i have now collected some good info from VDI HEAT TRANSFER ATLAS

Any how any further info will be pleasent addition in this regard

Take care
affan

[mxmaciek]

Any how any further info will be pleasent addition in this regard

Take care
affan

Well, if you want to design another one, without using of commercially available types, you can use average textbook with base engineering infos, i.e. Technical University of Lodz, Poland, Chemical Engineering textbook for second course students (this is an example only, as this text is in polish language only).

[AFFAN]

i have checked many average and above average text books but most of the books gives relations about agitated coiled tanks and not about simple helical coil exchangers or sample coolers

How ever Ludwig does give some references and also Vdi Heat Transfer atlas.


Affan