3.1.2 Baseline HVAC System Exceptions

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What 90.1 PRM Section(s) are relevant to this issue?
3.1.2 Baseline HVAC System Map, Systems 9 & 10

Explanation of issue:
Looking for some clarification on the application of the exception e) for 
Systems 90 and 10.

1) Is this exception only applicable to zones that are comprised solely of the 
following space functions listed in App 3.4A?
  Storage
  Stairway
  Electrical/Mechanical
  Restrooms
  Corridor/Transition?

2) CBECC does not explicitly model airflow networks/transfer air. With this in 
mind, did you have an alternate criteria for ensuring that it is only applied 
to zones that do not exhaust or transfer air from mechanically-cooled zones, or 
should it be based only on the proposed design heating source and space 
function? 

On a separate topic, baseline HVAC system exceptions c) and d) are not included 
in scope of Phase 1.  However, as they are currently described, the criteria is 
too vague to be implemented in software. If this is desired in future phases, 
please add specific criteria in the context of the SDD data model so the rules 
can be applied as intended by the PRM authors.

Proposed resolution:

Original issue reported on code.google.com by da...@360-analytics.com on 16 Sep 2014 at 12:03

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1)Regarding the space types that qualify for Sys 9 and 10- 
The user’s guide specifies that if a ‘other qualifying spaces’ exist in a 
building, they’re modeled as heated and cooled. i.e. if a space type 
doesn’t fall in the list ‘storage, stairwells, vestibules, 
electrical/mechanical rooms, restrooms’, then despite being heated only- it 
would be modeled as heated and cooled. 
2)Transfer air was decided to be moved to Phase II (as a part of the 
laboratory, kitchen exhaust effort)
Option 1-
Add a check box in the UI (for heated only spaces meeting the space type 
criteria listed above) to identify spaces served by transfer air- and also ask 
the space it received transfer air from for Phase II
If this can be done, then we can use all 3- i.e. heating source, space function 
and whether served by transfer air.
Option 2-
If this cannot be done, then we can document this as a task for Phase II and 
base the decision only on heating source and space function.

3)We've elaborated on laboratory and kitchen exhaust  in a separate section. 
That explanation is quite detailed-3.6.5.3 - Zone Exhaust for Kitchen and 
Laboratories. Is this not what you're referring to?

Original comment by supriya....@pnnl.gov on 17 Sep 2014 at 6:23

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1/2) 
Currently CBECC only looks at the SpaceFunction and that the proposed system 
serving the ThermalZone is heating-only, so that is what I will work with in 
the near-term.

The transfer air checks/space network you describe is an interesting idea, but 
this is a new feature and could be complex since transfer air can come from 
multiple spaces.  That said, I agree it would be best to support flow 
networks/transfer air more explicitly in the program.

So, just to summarize, for phase 1, systems 9/10 will only be applicable to 
zones made up of the the following SpaceFunctions that have heating-only 
systems:
  Storage
  Stairway
  Electrical/Mechanical
  Restrooms
  Corridor/Transition

Please let me know if I am mistaken.

3)
I only was going by what was described in 3.1.2, and did not look to 
cross-reference with other sections; thanks for pointing me to them. I'll 
review when the time comes.

Original comment by da...@360-analytics.com on 18 Sep 2014 at 12:58

• Changed state: Resolved

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1) Thats correct
2) ok

Original comment by supriya....@pnnl.gov on 18 Sep 2014 at 4:35

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Rules have been updated to only allow the space functions listed in comment #2 
to be eligible for systems 9/10. Closing issue.

Original comment by da...@360-analytics.com on 9 Dec 2014 at 10:06

• Changed state: DoneVerified