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NC-v4 EAp2:Minimum energy performance

For proposed case with spot cooling only, how to model baseline and satisfy unmet for both propsoed and baseline

Hi,

A proposed case with spot cooling in kitchen/food prep area is mechanically ventilated aswell. The spot cooling is served by PAHU units connected to ODU. 

For baseline model, ideally it should be sys4 considering climate. 

Following are few queries:

  1. Does DCS have to be part of the model if the MV flow is more than 5000CFM. 
  2. The proposed model should it satisfy unmet hours for the entire zone. 
  3. Is there any alternate approach where the zone can be out of the scope for energy modelling.
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Thu, 09/24/2026 - 12:23

If the total kitchen exhaust hood airflow is greater than 5,000 cfm then G3.1.1 exception d applies. In this case the Baseline system should be modeled based on the requirements of this exception (System 5 or 7 with demand control ventilation on 75% of the exhaust air, reducing airflow rates by 50% for half of the kitchen occupied hours, etc.). 
  1. Yes since G3.1.1 exception d applies
  2. Yes both models must still meet the unmet load hour requirements of G3.1.2.3, including the kitchen area. Note that the temperature settings should reflect the design intent of the kitchen space, and may differ from the other spaces in the building. 
  3. No

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