DUAL DUCT SYSTEMS
DUAL DUCT SYSTEMS
(OP)
A project I'm working on is being served by a 40,000 cfm dual duct air handling system. This is my first time actually working on such a system. The Cold deck is sized as a 40" round duct and the hot deck is about a 36" round. Can someone tell me how you typically size the cold and hot decks for such a system. Do both ducts need to be sized for 100% of the supply, or 50% hot deck and cold deck ...?
If I have a dual duct box that supplies air to a space that requires 3000 cfm how much of that is from the cold deck and how much is from the hot deck.
Thanks for your help.
If I have a dual duct box that supplies air to a space that requires 3000 cfm how much of that is from the cold deck and how much is from the hot deck.
Thanks for your help.





RE: DUAL DUCT SYSTEMS
RE: DUAL DUCT SYSTEMS
RE: DUAL DUCT SYSTEMS
RE: DUAL DUCT SYSTEMS
RE: DUAL DUCT SYSTEMS
We are just finishing a design of a renovation that includes a dual duct constant volume system. In our case we are modifying to a VAV system and utilizing the existing distribution and making all necessary modifications.
It sounds like you should dig a little deeper to find out the original intent of the design and what is it you are trying to achieve now with the redesign/renovation. Maybe VAV is possible, maybe even modifying some ductwork and adding an extra fan to use the return air to be the hot deck supply when available.
We could not do the latter due to space constraints.
RE: DUAL DUCT SYSTEMS