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 :

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

MPR for adjacent buildings

LEED project boundary lines that “slice” through party walls must not pass through any MEP service infrastructure. Exceptions include buildings served by a common or shared chiller plant or heating water, or steam supply pipes (i.e., not air ducts), and only if the thermal energy serving the structure to be separated is sub-metered. (p. 42 of “LEED 2009 MPR - SUPPLEMENTAL GUIDANCE”). The building that we want to certificate is being renovated and it is divided in two parts, one (offices) is going to be certificated LEED, the other one (factory) isn’t, although both are being altered. Would the use of a reversible heat pump that transfers heat from a building to the other one be possible? The goal is the conditioning of the offices, i.e. the heat pump heats them during winter and cools them during summer. An advantage is that in the industrial building there is a large thermal inertia.

0
Post a reply

You rely on LEEDuser. Can we rely on you?

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

Go premium for $15.95  »

Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Fri, 03/01/2013 - 18:54

If the flow is only one way - factory to office - then is seems like you could isolate it and associate it with the office only. Hard to say for sure without knowing more about the systems and buildings.

Mon, 03/04/2013 - 14:55

Thank you, Marcus When you write "flow" do you mean "heat flow"? It isn't only one way, because it is supplied to offices during winter season and it is removed from offices during summer season. The reversible heat pump exchanges heat directly with the air of the factory and it exchanges heat with the offices thorough a water loop. Then the water loop serves radiant floors and the water coils in the AHUs of the offices. Regards
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Mon, 03/04/2013 - 14:35

We have the same understanding of flow. So it sounds like an air to water heat pump but instead of the condensing unit being located outside it is inside the factory. If that is correct the question becomes - can you simulate the affect on the heat pumps of this location instead of the outside?

Mon, 03/04/2013 - 15:08

It is correct, Marcus. Thank you. Now I have to understand how I could do with the simulation software.
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Mon, 03/04/2013 - 15:57

As usual it depends on the software. The condensing unit will operate at a narrower range than if it was outside. This could possibly be simulated with a custom curve and/or some post-processing of the modeling results examining the hourly data. Sounds like a work-around is needed. I would consult the software vendor and discussion groups for the particular software for ideas on how to simulate this situation.

Mon, 03/04/2013 - 16:50

I have discovered that in EnergyPlus among the inputs of the object WaterHeater:HeatPump there is "Inlet Air Temperature Schedule Name". I think I'm going to use as schedule the setpoint temperatures of the factory. Thank you for the help, Marcus. I feared that such a system was not compatible with the concept of "party wall". Best Regards
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Mon, 03/04/2013 - 16:43

I think you can make the case but this is a grey area. For me since there is not a direct exchange of air or water crossing the boundary I think it is cleaner and more straight forward. The conditioning systems are really separate it sounds like to me even though the condensing unit will potentially impact energy use in the factory as well.

Add new comment

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