Cold Air Distribution System

[TXelaine]

Does anyone have any information on this type of system? I'm being asked to compare this system to a centralized system and there dosen't seem to be much info on the web. I know ASHRAE sells a book, but I'd really like to not pay to buy the book.

 

[imok2]

Many engineers are not familier with this concept, so it's not that popular ,however I believe it is a viable concept Here's some info :

http://www.trane.com/commercial/library/vol29_2/cold.asp

 

[cme]

Do you have added fees to do this comparison?

How many SF is this system? Office space?

You would have to use series fan powered boxes.

You could get 48 deg F supply temp if you went blow-thru and using 45 deg CHW. I would use a custom unit.

 

[walkes]

Mcquay has a free design application guide called Optimal Air Design Manual.

You can find it here:

http://www.mcquay.com/mcquaybiz/literature/lit_systems/AppGuide/AG-31-005.pdf

 

[Tvrm]

The biggest concern with low temp air distribution is insulating the ductwork properly to prevent condensation. Even specifing non permeable insulation will not garantee that the installer will fit and seal it right. In todays low bid competitive market the workmanship associated with the many of the insulation subcontractors is marginal to ok it's acceptable, but with low temp ductwork it has to be near perfect. Remember sweating ductwork leads to mold and mildue and for that basis alone there are many government agencies that will not allow low temp systems.