zones/hvac system assignments

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I have an existing building that has been renovated and expanded. The
existing area and new addition area are basically an open area with only a
service counter separating the two areas (new pharmacy). The existing HVAC
system is left in place to serve the existing floor area, and the addition
is getting a new system. There are two restrooms; one served by the
existing HVAC, and the other served by the new HVAC. An elec/data room has
its own little mini-split, and one other room has a unit heater. So this
brings a total of four different HVAC systems. I defined these systems in
the DD wizard, and wasn't able to utilize the zone assignments screen after
drawing new zones to coincide with these systems and different occupancy
types, so I intended to finish assigning zones in detailed edit. I did not
separate existing floor area vs new area since it is open area. After
defining the HVAC four systems in the DD wizard, I can't seem to find any
trace of them in detailed edit. Where do I best define these six thermal
zones and HVAC systems?

Kent Beason

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Hi Kent:
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Unfortunately, the wonderful names you established in the Wizard do not translate into the Detailed Edit mode. You will need to rename them in the Detailed edit Mode (always save a copy of your Wizard Mode in case you need to recreate). To figure out which zone and HVAC systems are which in Detail, go back to Wizard and take a screen shot (or sketch) the shapes of your zones (with names). Go to the Detail Edit mode and gp to a zone and ompare the shape to your Wizard mode. Now you can retype the name into the Detail mode.
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Just the way it is. Good luck.
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John R. Aulbach, PE

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Hi Kent,

Another approach could be to have 2 instances of eQuest open - one looking at your wizard level zonal names/inputs for reference only, and the other open to a separate "working" detailed model (these being 2 separate project files). Multiple monitors makes this sort of exercise notably simpler.

For the detailed model, I'd suggest navigating to the airside HVAC tab, and from here you can double click on systems and zones to rename as you wish to. Note that highlighting a zone on the left will highlight the corresponding zone in the 2D zone window. Between these visuals, you can almost certainly figure out which is which in 9 out of 10 cases. If you have lots of shells, multiple floors, or other contributing factors making this tricky, you can navigate over to the space tab to review where spaces are from the 3D view as needed.

Lots of ways to skin this cat. For future reference, I too only very rarely invest time trying to name stuff in the wizards, as very little carries forward into detailed mode (note some prefix/suffix options that are of use for shells and systems however). Naming of stuff basically happens in detailed edits, to the extent needed.

Hope this helps too!

~Nick
[cid:489575314 at 22072009-0ABB]

NICK CATON, P.E.

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In the attached you will see a simple building which is (supposed to be)
served by just two HVAC systems, each serving one-half the building. In DD
wizard, I defined only two systems accordingly, however you will see how the
four zones on one half of the building each have separate systems
(referencing model tree on left), whereas the red highlighted zone is on the
same system as the four other zones on that half of the building as
intended. How do I get the four zones on the other half of the building
assigned to the same system in DD edit (and then delete the other three HVAC
systems)?

Kent Beason

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In wizard mode - when you generate systems, make sure that you select one
system per site - so that other systems do not get generated automatically.

In detailed mode, you will have to go to individual zones and change the
parent system for them. Once all zones have been allocated appropriately to
corresponding systems, the non-required systems will not have any zones and
can be deleted.

Hope this helps
-Rohini

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Hi everyone,

The detailed mode procedure for removing and rearranging parent/child components applies to many other instances. Here's a visual guide for common reference:

To achieve your intent in the wizards:

1. First, select something other than "system per zone" in the first screen for both HVAC systems. I use "system per site" when I expressly do not a system replicated:
[cid:image002.png at 01CE68F7.051EABB0]

2. After all your systems are defined, for all shells, navigate to the "Zone Group Definitions" input screen to group your zones as intended, and also assign them to the intended system. As you're describing, you should create 2 zone groups to reflect the intended split, then remove the default zone groups, then be sure you've assigned the intended system to each zone group on this screen.
[cid:image001.png at 01CE68F7.77C6C850]
To correct in detailed edit mode:

1. Identify which systems you want to keep - I'd personally assign those systems to remain identifiable names at this point:
[cid:image004.png at 01CE68F8.563030E0]

2. Re-assign the parent system for all zones under systems you don't want to keep to the appropriate system. You can do this by either double-clicking the zones in the component tree, or also via the spreadsheet view. Upon changing this input, you'll find the component tree to the left re-arranges to slot the revised zone under the newly-assigned parent system. If needed, the "Zone Locations" graphic in the Air-Side HVAC System tab can assist with determining where any selected zone in the tree is located in the shell.
[cid:image005.png at 01CE68F8.C01FCA10] and/or[cid:image006.png at 01CE68F8.C01FCA10]
Result: [cid:image007.png at 01CE68FA.97001200]

3. Finally, right click the systems in the component tree you want to get rid of (they should have no child zones), and delete them. This is not an optional step - you'll run into errors trying to simulate if you leave them in. Note this right-click context menu from the component tree is also a means to create/copy/link systems and other components, in detailed mode. You should explore the possibilities if you haven't already before removing the unintended systems completely.
[cid:image008.png at 01CE68FA.97001200] [cid:image009.png at 01CE68FA.97001200]

Hope this helps - plenty of related discussions are available in the mailing list archives, for further reading.

Regards,

~Nick
[cid:489575314 at 22072009-0ABB]

NICK CATON, P.E.

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Proper planing of heating and ventilation is the most important thing which every home and business owner wants to set up. Following are the few tips you always has to considered. 

1. Make ventilation system simpel

2. Don't use too much large units for small space

3. Must install air conditioners with teh appropriate space.

There are several others ways too.   

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James Mark you mentioned some worth mentioning points which above users didn't write. So make sure you make simple ventilation system and If you have to Install Air Conditioner then do consult with Air Conditioning Repair Phoenix company

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