HVAC Systems, Roof Modeling

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Hey all,

I have two questions:

1) I have packaged AC units for cooling, but hot water loop heating. The only way to select packaged AC units is to say there is no heating, so I created another HVAC system just for heating. It appears, however, that you can only assign one HVAC system to each zone. Has anyone had this problem and/or know of a solution (how to have packaged AC units yet also have hot water heating)?

2) I used two shells for a five-story building: one shell for the ground floor and another shell for the four upper floors. Thus, I only need one roof (above the fifth floor); does eQuest model a roof for every floor in a shell? If so, how can I make it model a roof for only the top (fifth) floor?

Thanks a lot,


Daniel Wilkerson's picture
Joined: 2011-09-30
Reputation: 0

1) eQuest can TO create a package unit (DX cooling) with hot water coils
for heating. You can even do that in the Schematic Wizard.

2) I just created a 10 story shell. Only the top floor has a roof. Only
the top floor of ANY shell has a roof.

3) The BEST way to remove a roof is to finally convert to Detailed Edit
mode (you aren't going back to Wizard at this point), go into the .inp
file in the tree directory, and manually change the roof to a ceiling.

John R. Aulbach, PE, CEM

Aulbach, John's picture
Joined: 2011-09-30
Reputation: 0

Regarding Item 3:

If you have recessed floor plates (a stepped pyramid in the simplest
sense), you would have to create zones within the lower (larger) shell
that coincides with the exterior wall of the upper (smaller) shell and
only change the roof of the non-exposed zones to ceilings, correct?
This seems very complicated in that you are creating a zoning pattern
independent of your thermal zoning just to stitch shells together. I'm
running into this issue on a project with varying floor plates and I'm
somewhat stuck on how to sub-zone the lower shell. For example, on one
elevation the perimeter zone is defined 15 ft. from the exterior wall,
but the upper shell only steps back 6 feet. My perimeter zone would
therefore have to consist of two sub-zones for the purposes of
roof/ceiling assignment, but thermodynamically they should be treated
the same. How have the experienced modelers addressed this issue? Or
is this even an issue I should worry about?


Luka Matutinovic, B.A.Sc., LEED(r) AP

Matutinovic, Luka's picture
Joined: 2011-09-30
Reputation: 0