Commercial Kitchen rules

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What NACM Section(s) are relevant to this issue?
5.6.5.3
5.6.5.4
5.7 Table 26

A couple clarifications requested for commercial kitchen systems:
1) Under no circumstance should System 13 have an economizer?
2) Table 26 for System #13 indicates 'No return fans', should this say 'No 
relief fans'?
3) How is it intended that baseline designs with >5000cfm Type I/II kitchen 
exhaust airflow comply with 140.9(b)2B?  A short paragraph of the intended 
operation assumptions would be very helpful.

Proposed resolution:

Please provide any additional information below.

Original issue reported on code.google.com by da...@360-analytics.com on 30 Nov 2014 at 6:27

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As we discussed on our call, the primary assumption for the baseline design is 
that the kitchen exhaust make-up air is provided by transfer of ventilation air 
from other zones.  This is a reasonable assumption for designs that have 
transfer air available.  However, for buildings that are primarily driven by 
this process, and the proposed design used DCV to control make-up air, the 
baseline rules break down and provide a large compliance margin. This is best 
illustrated by a test model we have, OffSml-CommKit_SZVAV, where the whole 
building is basically a giant kitchen.  In this case, there >5000cfm exhaust in 
the building, but o transfer air from other zones.  This results in the 
baseline OA flow stuck at the design make-up air flow rate during all hours, 
despite the fact the kitchen exhaust system only runs intermittently.

Therefore, I suggest we make the baseline rules be dependent on the amount of 
available transfer air used. If the baseline design does not reflect using at 
least 50% of the BuildingStory ventilation air as make-up, the baseline design 
uses DCV control of make-up air.  Thoughts?

Original comment by da...@360-analytics.com on 12 Dec 2014 at 6:41

• Changed state: Discussion

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One other item I'd like to point out is the weekend Restaurant Ltg/Plug 
schedules don't seem to line up with the occupancy, HVAC availability, and 
exhaust schedules.  This could lead to issues with UMLHs in the proposed and/or 
baseline designs. I can post an updated schedule, but basically I propose we 
shift the Ltg/Plug weekend schedule forward to match the occupancy.  This would 
have impact on sensitivity tests that use the 'Restaurant schedule, so this is 
perhaps a lower priority.

Original comment by da...@360-analytics.com on 12 Dec 2014 at 6:50

Attachments:

• [Restaurant Ltg-Plug Schedule.PNG](https://storage.googleapis.com/google-code-attachments/cbecc/issue-861/comment-2/Restaurant Ltg-Plug Schedule.PNG)