See all forum discussions about NC-2009 EAp2

Subscribe to new posts about NC-2009 EAp2 Post a new question aboutNC-2009 EAp2

See LEEDuser’s guidance on NC-2009 EAp2»

FAQs about EAp2 :

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?

The Section 9 space-by-space method does not include residential space types. What should I use?

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?

View answers »

Forum discussion

NC-2009 EAp2:Minimum Energy Performance

Off-hours control, automatic shutdown

Ricardo Sá

Director of Sustainability

Edifícios Saudáveis Consultores (503 910 767)

LEEDuser Basic Member

79 thumbs up

May 12, 2015

According to ASHRAE 90.1 (section 6.4.3.3.1), all HVAC systems shall be equipped with a control systems that turns the HVAC off on a time basis (timeclock control) or when the spaces are not in use (occupancy sensor). Hotel rooms are not exempt from this requirement. However, in these zones, timeclock control is not possible and occupancy sensor control can lead to malfunctions’ (e.g., during nightime the system will probably shutdown even if temperature control is desirable). How can this problem be solved? Interlock with a common keycard system (HVAC off when keycard is not in slot) complies with this requirement? If not, which are the alternatives? Regards, Pedro

Post a reply

Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Tue, 05/12/2015 - 13:48

I frequently see occupancy sensor controls, keycard, or some sort of central control system in hotels.

Ricardo Sá

Director of Sustainability

Edifícios Saudáveis Consultores (503 910 767)

LEEDuser Basic Member

79 thumbs up

Tue, 05/12/2015 - 15:00

Thanks for your quick reply. The question is: can common keycard systems (HVAC off when keycard is not in slot) be considered valid for ASHRAE 90.1 compliance?

Marcus Sheffer

LEED Fellow

7group / Energy Opportunities

LEEDuser Expert

4454 thumbs up

Tue, 05/12/2015 - 15:19

Yes

Add new comment

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