See all forum discussions about CS-2009 EAp2
 Subscribe to new posts about CS-2009 EAp2 Post a new question aboutCS-2009 EAp2
See LEEDuser’s guidance on CS-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

CS-2009 EAp2:Minimum Energy Performance

number of secondary CHW pumps and cooling towers

Dear Sir/Madam, Per the revised section 1.4 table, the number of secondary CHW pumps and cooling towers should be one. i do not understand it and not find the corresponding item in ashare 90.1-2007 appendix G. the number of secondary CHW pumps is same to the desgin case, is not it? the number of cooling towers should be same to the number of chillers? why should they be one? Thanks in advance regards, tiantian beijing,china.

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

Mon, 07/08/2013 - 14:26

It is not the same as the design (proposed) case. There should be just one secondary CHW loop serving the building in the baseline. G3.1.3.11 does not state that there should be more than one tower. It does so for the pumps and if more than one tower was required we would assume that it would say so.

Tue, 07/09/2013 - 04:27

Dear Marcus, I really appreciate your reply , but I have trouble to understand you. G3.1.3.11 does not state that there should be more than one tower you think it means there should not be more than one tower. There should be just one secondary CHW loop serving the building in the baseline. it is right. But does it mean that there should be one secondary pump serving the secondary CHW loop?
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Tue, 07/09/2013 - 13:40

There are many instances in 90.1 and Appendix G where you are not directly told what to do. So if it does not directly tell you what to do, the language must be interpreted. Our interpretation is what I stated in my previous post. Based on the language in the section Table 1.4 our opinion aligns with the guidance provided by GBCI. So yes one secondary pump serving one secondary pump loop. G3.1.3.11 states that there should be more than one pump if applicable. If the intention was to have more than one tower our interpretation is that they authors would have said so. To do otherwise would be inconsistent. Nowhere does it state that there should be more than one tower. So a literal interpretation is that you only have one tower no matter how many chillers in the baseline. One thing to keep in mind - the Appendix G baseline never gets built and does not have to fully function in the physical world. Sometimes folks get hung up on trying to design the baseline system.

Add new comment

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