Posted by T_Bone on November 03, 2009 at 08:22:00 from (64.57.205.153):
In Reply to: Installing duct work posted by TimMiller on November 01, 2009 at 21:10:21:
Hi Tim,
Well I can shed some light on your question but your not going to like the answer.
Anyone that states designing air flow is simple has another think coming. Air is very difficult too control therefor takes alot of engineering to make it do what you want.
There's only two well recognized authorities on HVAC&R. One is SMACNA (Sheetmetal Air Conditioning National Assoc.) The other is ASHREA (American Society of Heating & Refrigeration Engineers Assoc.)
Those two produce 99% of the engineering info that's accurate and there lies the kicker, " that's ACCURATE".
Since that is true, then they want who ever uses that info to be qualified to do so to produce quality engineered systems therefor they require a background check for schooling and experience before accepting one into there associations.
After ones accepted, there's a huge cost too owning there publications, typically $50 upward with most being several hundred dollars a text for the most common text references that a engineer will use in designing quality HVAC&R systems.
From the above info, you would be better off finding a company that will engineer a quality system design for you. I would think you could get a local complete quality design for under $1000 tops.
Why pay the engineering cost? You will have a lower utility bills, feel more comfortable, suggestions for the most efficient system units being overall cost effective for your area.
Example:
(David, I'm not picking on you but you posted the info for my example)
Air flow above 500fpm is very noisy and makes it difficult to control human comfort.
Humidity plays a huge roll in human comfort.
Designing the wrong sized duct work, will cause the fan motor too fail because of too high of static pressure.
That's just some of the many considerations I use for designing systems.
If your wanting a good "generalized" text reference, but by no means enough info to design a complete system the I would by:
Modern Refrigeration and AC
GoodHeart & Wilcox
ISBN:0-87006-642-0
About $60 or so and at many places, WW Grainger, Johnstone Supply, bookstore, on-line, etc;
This one text reference is a great bang for the buck.
T_Bone<---45yrs ASHREA HVAC&R Design Engineer, Indoor Air Quality Engineer, Energy Management Engineer, AWS-CWI, Retired, Ranked in the top 60 of 150,000 of my peers, designing & troubleshooting multi-million dollar control systems.
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