[Equest-users] question about inefficiency of duct

[McArdle, Mike]

Dear xiaoyang shi

It Depends on the temperature differentials between air in duct and space and insulation thickness

But more importantly , if the air  in duct is the same air as the air being supplied to the space there is no net effect


Thank you,  Sincerely,

Michael J. McArdle , P.E.
Buildings Engineer II, Project Manager
State of Vermont,
Buildings and General Services (BGS)
2 Governor Aiken Avenue
Montpelier, Vt. 05633

Office: 802-828-5650;  cell: 802-272-4828

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of xiaoyang shi
Sent: Tuesday, March 29, 2011 5:37 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] question about inefficiency of duct

Hi folks,

In the winter time, some heat loss in HVAC is from duct.

What is the percentage of heat loss through the duct to the total building heat load, due to the inefficiencies of duct delivery system?

Thank you guys.


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