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

Mandatory provisions for a heat pump

I have to model a heat pump that outside the building exchanges heat with the external air and it exchanges heat with the building, i.e. with the internal part of the HVAC plant, thorough water. The heat pump works both in heating mode (winter season) and in cooling mode (summer season). Now I am interested in understanding what mandatory provisions shall be respected for the cooling mode. The building is in Italy and the heat pump was produced in Italy, therefore no certification according to ASHRAE standards exists. I think that I have to consider Table 6.8.1C “air cooled, with condenser, electrically operated”, therefore Minimum Efficiency: 2.80 COP, 3.05 IPLV. Test procedure is presented in ANSI/AHRI standard 550/590. I would like to contact the producer of the heat pump and to request the COP for a particular condition. The problem is that in Table 2 of ANSI/AHRI standard 550/590 very broad ranges are used: for leaving temperature 36.0 to 60.0 °F, for entering air dry bulb 55.0 to 125.0 °F (air cooled). For what temperatures shall the comparison with the minimum efficiency be made? In such broad ranges the performance can change a lot. Best Regards

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, 02/15/2013 - 14:27

I have run into these systems before internationally and I do not think that an air to water heat pump is directly covered in the 6.8.1 tables. If the equipment type is not explicitly listed in the 6.8.1 tables then it is not covered by the standard and has no minimum performance requirement. This issue is covered in the User's Manual page 6-12. An air cooled chiller is not the same as a heat pump so I do not think 6.8.1C applies. The only component that may be covered is the air cooled condenser in Table 6.8.1G. If that applies just make sure your system complies.

Mon, 04/08/2013 - 13:39

I’m sorry to take up this topic after many weeks, but Table 6.8.1G refers to ARI 460 (the new version is ANSI/AHRI Standard 460) and an engineer of manufacturer has observed that ANSI/AHRI Standard 460 is relative to “Remote Mechanical-Draft Air-Cooled Refrigerant Condenser (Air-Cooled Condenser). A factory-made encased unit which is intended for connection in the field by means of refrigerant piping, and which includes a means for forced-air circulation and elements by which heat is transferred from refrigerant to air. The purpose of this unit is to condense refrigerant vapor by rejecting heat to the air” while the reversible heat pump that I’m considering is not a remote condenser. In fact in an unique equipment there is the whole vapor-compression refrigeration cycle. Does it mean that for such an equipment no mandatory provisions shall be met? Regards
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Mon, 04/08/2013 - 14:05

If the equipment type is not explicitly listed in the 6.8.1 tables then it is not covered by the standard and has no minimum performance requirement. Just make the case in a narrative that the equipment is not covered.

Add new comment

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