Hello there,
In a 5A climate zone, I am working with a Proposed model with a RTU (30,000
CFM, 100% OA) with exhaust air ER wheel in it. I am kinda sure that I've to
create a ER wheel for the 90.1 Baseline (as per G3.1.2.10). Just want to
make sure if I am correct?
Help please. Thanks
Best,
Aru Sau
*Architectural Sustainability | Energy Analyst*
*analyzing the ROI of your sustainable initiatives...
*
*c: 678-467-7934, **Ann Arbor, MI*
Hi Aru,
Yes you are correct - you have to create an exhaust air heat recovery with
at least 50% effectiveness in your baseline bldg. Check out section
6.5.6.1 of ASHRAE 90.1 for further guidance.
Darryl Kasun, P. Eng,
Interior Engineering
Hi ,
@Arunabha: Yes, It would be correct o model a Heat Recovery Wheel with 50% effectiveness in the baseline building.
(For a Building that uses 100% Fresh Air with an ER wheel)
Though I was trying to figure out how the logic fits into the G3.1.2.10 in this case?.
Because it says, The design supply air capacity of Individual fan system must be 5000cfm or greater AND have a min outdoor air supply of 70% or greater of the design supply air quantity then shall have an Energy Recovery wheel with 50% effectiveness?
Best Regards
Kumar
Aru,
I may be reading the question wrong but the proposed case system does NOT dictate baseline case ERV requirements. If the autosized baseline case systems meet the characteristics outlined in 90.1-2007(?) Section G3.1.2.10, then an ERV must be included on that system unless one of the exceptions apply.
Anthony Hardman, PE, BEAP, LEED AP BD+C
Senior Building Performance Analyst
The Green Engineer, Inc.
(978) 610-2801
Hey Anthony,
I believe you're absolutely right. Because of this confusion I posted in
the forum!
In my case, this is climate zone 5A. Supply Air is more than 5000 cfm per
fan. And the proposed system is on 100% OA with HR wheel. It's for a
car-repair bay/garage.
So you think the Baseline won't need an Heat Recovery Wheel? Should I be
modeling it as even 100% OA?
Best,
Aru Sau
*Architectural Sustainability | Energy Analyst*
*analyzing the ROI of your sustainable initiatives...
*
*c: 678-467-7934, **Ann Arbor, MI*