[Bldg-sim] rintveld at ptrenergy.com

Tue Aug 25 10:47:00 PDT 2020

Hi Syed,

The baseline system types are only applicable to conditioned portions of the building (hence why exception a) to Section G3.1.1 uses the term conditioned floor area). Therefore, since you indicate that the Proposed design is semiheated for freeze protection only (you should double check the definition of semiheated space in the Section 3.2 definitions though), the Baseline System would be modeled as heating only of the same type as the proposed, but you can take credit for any efficiency improvements if applicable.

Alex

Alex Chapin EIT, BEMP, LEED AP BD+C, O+M
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From: Syed Safiuddin Hussaini [mailto:safi.hussaini91 at gmail.com]
Sent: Tuesday, August 25, 2020 12:50 PM
To: Jim Dirkes <Jim at fsmgmt.co>
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] rintveld at ptrenergy.com

Jim,

Thank for sending this info. Actually ASHRAE 90.1-2007 code did not have this option for semi heated spaces which I was using for a 179d  project. This makes sense.

Thank You

Syed Hussaini, PE, LEED GA

Energy Engineer II

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On Tue, Aug 25, 2020 at 4:34 AM Jim Dirkes <Jim at fsmgmt.co<mailto:Jim at fsmgmt.co>> wrote:
I think your Baseline HVAC system should be System #9 or #10

>From 90.1-2013
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From: Bldg-sim <bldg-sim-bounces at lists.onebuilding.org<mailto:bldg-sim-bounces at lists.onebuilding.org>> on behalf of Syed Safiuddin Hussaini via Bldg-sim <bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>>
Sent: Monday, August 24, 2020 9:10 PM
To: bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org> <bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>>
Subject: [Bldg-sim] rintveld at ptrenergy.com<mailto:rintveld at ptrenergy.com>

Hello All,

I am doing an Appendix G model for a warehouse building that has a semi-heated space for freeze protection only by using infrared heaters. But it is a 35,000 SFT warehouse building and if I go by Table G3.1.1A the system type to be used will be System 5 Packaged VAV with Reheat in the Baseline 90.1 model and I would have infrared radiant heaters in the proposed model. Should I use the same system type in both Baseline and Proposed model i.e. infrared radiant heaters with same efficiencies and temperature setpoints or can the Baseline system be Packaged VAV with Reheat and infrared radaint heaters in the proposed model ?

Thank You

Syed Hussaini, PE, LEED GA

Energy Engineer II

________________________________

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