FAQs about EAp2 :

Can the Passive House Planning Package (PHPP) be used to energy model for LEED?

Is it acceptable to model a split-type AC with inverter technology compressor as a heat pump, like modeling VRF?

Can the Trace 700 'LEED Energy Performance Summary Report' by uploaded to LEED Online in lieu of the Section 1.4 tables spreadsheet?

A portion of our building envelope is historic. Can we exclude it from our model?

Which baseline HVAC system do I use if my building has no heating or air conditioning?

For an existing building, do I need to rotate the model?

Our project has a diesel backup generator. Should we include it in our energy model?

Our project has a large process load—75%. Despite our efforts to make an efficient HVAC design, the cost savings are minimal. What can we do to earn this prerequisite and be eligible for LEED certification? Is there any flexibility in how we model the p

Can SHGC be higher in the proposed than in the baseline model?

Our process load is higher than 25%. Do we have to justify that?

Do I need to justify the electrical and fuel rates I am using in my model?

Our local code references ASHRAE 90.1-2010. Should I use that for my documentation, or 90.1-2007?

Can I claim exterior lighting savings for canopy lighting even though a baseline model cannot include shading elements?

The project is built on a site with existing exterior lighting installed. How should this be accounted for?

Can mezzanines open to floors below be excluded from the energy model?

How do I provide a zip code for an international location?

For a project outside the U.S., how do I determine the climate zone?

For a project outside the U.S., how do I determine the Target Finder score?

Do hotel rooms need automatic light shut-off control?

How commonly are the 90.1 mandatory compliance forms submitted as part of EAp2/EAc1?

View answers »

Forum discussion

NC-2009 EAp2:Minimum Energy Performance

Proposed case outside airflow rates

Hi, Our office building is ventilated with a constant volume AHU and conditioned by VRF system. AHU supplies 100% fresh air to the spaces, while VRF system provides heating and cooling. AHU has heating and cooling coils, however the system is not designed to control the room temperature, it only supplies fresh air with constant temperature. Because of the modeling software's limited ability, we had to model two separate systems for the same zone; one system for AHU and another for VRF. And we entered the same amount of outdoor airflow rate for both of these separate systems. Therefore, total outdoor airflow rate is actually double-counted in the proposed model. Recently, we received this review comment: "It is unclear whether the minimum outside air rates (in CFM) were modeled identically in the Baseline and Proposed Case for all zones not having Demand Control Ventilation in the Proposed Case. Confirm that the minimum outside airflow (in units of cfm) was modeled identically in the Baseline and Proposed case using the proposed case rates." How should we approach this? Should we model the VRF system with zero outside air flow, since it works separately from the ventilation system? Any help would be appreciated. Thanks.

0

You rely on LEEDuser. Can we rely on you?

LEEDuser is supported by our premium members, not by advertisers.

Go premium for $15.95  »

Tue, 07/11/2017 - 15:54

How you model this could vary depending on the software you are using. In some software you need to create a dummy zone. For software specific questions usually the best place to try is either customer support (if it exists) or one of the discussion groups. There are several at onebuilding.org and http://energy-models.com/forum

Add new comment

To post a comment, you need to register for a LEEDuser Basic membership (free) or login to your existing profile.