Chimney Design

"what wil be the thickness??" 1.7 henway

"what will be the Height?" 1.1 meter

This is correct for some parts of the world. Your local codes may vary.

^{CR4 members: The henway is up for grabs: get it while it's hot}

In our area a henway is the space a hen can squeeze through, around 4"...The you got your baby henways, about an inch....Then you got yer forced henways, which can vary from dead henway to feathered henway...these are of course, open to interpretation as some wild claims have been made with no peer reviewed confirming results....

thaaanx..

but can you give me the design procedure..or equations which lead me to above values

Ah, I see. You wish to have additional information.

Well, what additional information can you share with the forum? Even a few basic things like; Where this is to be constructed? Of what material do you propose to construct this chimney? What is it exhausting? How large is this boiler? Surrounding geography, wind patterns, lightning protection...

Just about anything you tell us might help.

ok....just i want to know standard Equation which you used for sizing....

You have to know how many henminutes of fuel you're using....right back at ya...

http://www.engineeringtoolbox.com/chimney-area-heat-load-d_1132.html

http://en.wikipedia.org/wiki/Fire-tube_boiler
http://en.wikipedia.org/wiki/Boiler_(steam_generator)

Great! Setting realizable goals is one of the best things a person can do. I find it interesting that you wish to design a chimney for a very specific type of boiler. Do you think that the chimney for a fire tube boiler will be greatly different than a water tube boiler, a packaged boiler, a fluidized bed combustion boiler or any of the other different ways that one can safely boil water? All of these different techniques will certainly have different fireboxes.

I think that the chimney dimensions will have nothing to do with the boiler technique. I think this because I've built many safe campfires when I was young and I boiled a lot of water on them so I could get some tea. I also did a search engine search of a "fire tube boiler" and found that this type of boiler is used in both moving and fixed installation designs with vastly different designs for their chimneys. So even though I don't design chimneys, I believe I know more about chimney design than you. I know more about chimney design than you should be able to easily find on your own. I also know that a Henway is the wrong unit for chimney thickness. A Henway can be very important to Quentin Robert DeNameland.

http://wiki.killuglyradio.com/wiki/Quentin_Robert_DeNameland

The size of the boiler, in terms of the rate and type of fuel being used, is so important, that very little sensible advice can be realised without it.

BTW: this forum isn't known for being happy playing "20 Questions" games...

Suhaib,

Repost on the Mechanical Engineers Forum if you want a real answer....

Reading this advice, my first thought was to consider it bad advice.

As I consider further, I may have been too quick to judge. This may be the best advice given so far.

Yes, I am more certain now; your advice is more valuable than any opinion or advice previously offered in this thread. Suhaib should repost this same woefully incomplete set of sentences on the Mechanical Engineering section of CR4. The reference manuals used by CR4 members whose domain is the ME section are chock-full of answers to questions like

How Much Does A Fire Alarm Cost For Garage In NYC?
Is really possible to create vacuum cleaner with 5v available from USB port?
Who knows how to leach .9999 silver into distiled water the right way?

This comment reveals some of my intent, as it relates to CR4 comments. If the comments here had "... sourced for more meaningful questions." then we may have been able to provide more meaningful responses.

Dear Suhaib,

Your question is in broad sense.

You have to indicate the following.

Generally more height of chimney will create more natural draught. But cost considerations of chimney construction comes in to picture. However to design a chimney we need the following data.

1. The capacity of the boiler.

2. The type of fuel used and the excess air permitted - this is required to calculate the Flue Gas Volume as it is to be calculated for complete combustion of fuel

3. The analysis of fuel like Carbon, Hydregen, Oxygen and Sulphur etc. in percentage. Then only we can calculate the theoretical air required asper Stoichrometry

We have to stike a balance between operational cost of ID, FD and SA Fans Vs. the cost of chimney construction.

DHAYANANDHAN.S