See all forum discussions about NC-v4 EAp2
 Subscribe to new posts about NC-v4 EAp2 Post a new question aboutNC-v4 EAp2
See LEEDuser’s guidance on NC-v4 EAp2»
FAQs about EAp2 :

Do the required savings for this prerequisite (and credit) need to come only from building energy, or also process loads?

Our project doesn't have enough energy savings to earn the prerequisite. Can we get there by incorporating onsite renewables?

Our proposed design has insulation R-values that are below those prescribed by ASHRAE 90.1-2010. Can we still meet the prerequisite?

View answers »

Forum discussion

NC-v4 EAp2:Minimum energy performance

Baseline case system selection- Exception

Hi All,

We are working in a pharmaceutical industry project which has a conditioned area of 78000sq.ft; as per ASHRAE 90.1 2010 the baseline case system is System 6 – Packaged VAV with PFP Boxes.

Since it is pharmaceutical industry we have a zones having special pressurization relationships, cross contamination requirements and code required circulation rates. So can we use System 4- PSZ-HP?

Whether this type of exception is possible in ASHRAE 90.1 2010 G3.1.1 Baseline HVAC system type and description.

Thanks in Advance

 

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 ignaciofurnies
ignacio furniés
LEED BD+C Energy modeling / sustainability consulting
Revitaliza Consultores
LEEDuser Basic Member
0 thumbs up

Wed, 06/20/2018 - 13:35

Yes, you have to use System 4- PSZ-HP.
Profile picture for user sheffer
Marcus Sheffer
LEED Fellow
7group / Energy Opportunities
LEEDuser Expert
4454 thumbs up

Wed, 06/20/2018 - 13:46

Check out the exceptions under G3.1.1. You must use the ones that apply to your project.
Profile picture for user cory.duggin
Cory Duggin
Senior Energy Wizard
TLC Engineering Solutions
LEEDuser Premium Member
44 thumbs up

Thu, 06/21/2018 - 16:09

If the project was v2009, it would be pretty cut and dry.  In 90.1-2010 the exception for spaces with code-required air change rates or special pressurization requirements has been removed.  The only way you can use Sys4 rather than Sys6 is if G3.1.1 exception b applies, which is for spaces with loads that differ by more the 10 Btu/h/ft2 or schedules that differ by more than 40 equivalent full load  hours per week.

Add new comment

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