sizing duct work

jeff_51

and definately go to a class if you get the chance.

grindog

proper duct work sizing

is there any literature out there on how to properly size duct work? Also how do you size for air conditioning. I am trying to start a sheet metal and air conditiong division to my plumbing shop and any info would be greatly appreciated.

don_132

many

books written on the subject.May I suggest the manual d res
duct system and understanding the friction chart.

Both you can find at Acca.org.

Also we have www.thesheetmetalshop.com.Bud Goodman gets deep in to true lengths,orthographics projection and such.

Enjoy!

Constantin

I am a a mere homeowner myself...

... but I learned a lot about sizing AC systems properly by diving into the intricacies of Manual-J, which helps size systems. The latest revision is version 8 (which I have not read). From the people that have taken the ACCA class, it is apparent that the fudge factors that were slipped into the calculation (25%+) are being scaled back as environmental factors are better understood and taken into account.

Manual-D helps refine air-based systems further by helping you size ductwork to ensure that the cold/hot air reaches the intended destinations in a quiet and efficient manner. The ductulator, Wrightsoft package, etc. also help size these ducts, but again I'd look to get a good grounding first before automating the process. Nonetheless, a number of neat software packages exist to pull it all together.

For example, HVAC-Calc is a good start in the AC business, since it'll give you a pretty good idea how various building enevelope decisions play together to create a particular heat loss/gain. It's duct-sizing component doesn't seem to take duct lengths into account, however, so a ductulator, etc. are in order. Even more comprehensive packages like Wrightsoft put heat loss, duct sizing, etc. all into one package... for a price, of course.

Eugene Silberstein 3

Duct Sizing

Where are you located, Wilbot? The reason I ask is that here on Long Island we may be putting some classes together on just that topic, which would include the use of both manual "D" and "J".

Ken D.

Duct

Carrier Corp. has very good schools, literature and computer programs available. Most of the other majors have tons of resources also. Southwark Sheet Metal Products in Philadelphia has good basic stuff available for the novice. Nice stuff is available from The RSES, SMACNA and ACCA. The RSES is my preferred choice for our new guys. Won't cost you an arm or leg. Call them in Des Plaines, Illinois for your local chapter.