VAV zone/Daylighting/DCV questions...

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eQuest Newbie question 1...When creating a building in eQuest that is
served by VAV and Fan-Powered Boxes, is it suggested that I create a
'zone' (using the wizard) for every single zone in the building that is
served by an individual VAV or FPB or should the zones be based purely
on similar exposures??

eQuest Newbie question 2...In the detailed edit mode, can I just have
one zone have daylight lighting controls while the other zones in the
system have generic lighting controls? If so, how and where do I do
that?

eQuest Newbie question 3...In the detailed edit mode also, can I just
have one zone have Demand Control Ventilation while the other zones in
the system have a constant minimum OA value? If so, how and where do I
do that?


josh.greenfield's picture
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Joined: 2011-02-17
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Josh,

1)It depends. You'd have to tell us more about the project.

2) Yes, you can have separate daylighting controls for separate spaces.
Click on the building shell tab. On the component tree in the left hand
pane, doubleclick on the space(s) you want to specify daylighting control
in, then choose the daylighting tab. Alternately, if you have several space
that will have daylighting, you can also do this out of the spreadsheet
view. When you are done inputting the data, have a look at the 2D view.
The virtual photocell location and view direction will be shown, so you can
double check whether you've input all of it correctly.

3)Yes. Air-side HVAC tab. Select the zone(s) that will have DCV as in the
last example. On the zone dialog box select the airflow tab. If the
system serving the zone is a VAV or PIU, you'll be able to specify DCV in
the minimum flow control drop down selection box. Choose the DCV control
type that most closely matches your installation - if you right click on the
minimum flow control selection box, you'll be able to select the item help
description.

Steven Savich

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Joined: 2011-09-30
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Josh,

1. I would say that you should create a separate zone for each
terminal unit, especially if it has a FPB. Even if the exposure has the
same, the internal loads may be different.

2. Yes. BUILDING SHELL, Space properties, Daylighting tab

3. Yes. AIR-SIDE-HVAC, System properties, Outdoor Air tab, Outdoor
Ventilation Air; Minimum OA Sizing Method - Select DCV Return Sensor
(See attached file)

Good luck!

Eric Youngson

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Joined: 2011-09-30
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Appendix A of ASHRAE 90.1-2004 states that:

"The opaque mullions of the spandrel shall be covered with insulation
complying with the steel-framed wall requirements."

My climate zone requires both cavity and continuous insulation.

Am I to take this that the spandrel should be covered with both the
R-value of the cavity and continuous or just the continuous insulation?

Does the spandrel glass need to be covered?

thanks.

Timothy Howe, MS, LEED AP

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