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How do I make the hot deck of the dual duct system remain constant in a system?

asked 2017-12-05 14:14:29 -0500

nbjensen's avatar

updated 2017-12-15 13:18:30 -0500

I am trying to model a University Building that has dual duct systems in it that run at constant and variable air volume. I have two questions that go with this:

  1. Is there a way to make the dual duct system supply constant air? As far as I can see there is only the Dual Duct VAV that pairs with dual ducts.

  2. Is there a way to ensure that the hot deck runs year round? I am designing for climate zone 5A, so naturally the heating numbers should dip in the summer months; however, this building supplies hot air year-round (thus why I am retrofitting it). I need the hot deck to continue to run even at a constant rate all year.

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answered 2017-12-06 03:38:17 -0500

Question 1: I just added the two missing Dual Duct objects in PR #2877, that is AirTerminal:DualDuct:ConstantVolume and AirTerminal:DualDuct:VAV:OutdoorAir

For now the only available one is indeed the AirTerminal:DualDuct:VAV. Perhaps you can try forcing the Zone Minimum Air Flow Fraction to 1 to mimic a Constant Volume one.

Question 2: I think that's going to be the case if you place a SetpointManager:Scheduled on your hot air leg, isn't it?

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Asked: 2017-12-05 14:14:29 -0500

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Last updated: Dec 06 '17