[Bldg-sim] 90.1-2010 Appendix G heat source question

Jones, Christopher cjones at halsall.com
Mon Nov 17 05:44:35 PST 2014


Cheney,
A previous post from 2011 stated that the LEED reviewer provided the following comment:


“Section 1.1.A of the form indicates that the primary heating source is fossil
fuel. However, the electric heating energy use reported in Table EAp2-5 for the
Proposed Case exceeds the fossil fuel heating energy use. Please verify that the
correct heating source has been selected. If electric heating is the primary
heating source, please change the Baseline system type accordingly. Provide
updated simulation results and a revised Prerequisite Form as necessary.”

That is why I selected System 7 with an electric boiler (the predominate heating source is electric).

Should I not also selecte System 3 with electric heat for the special spaces even though the User Manual suggests fossil furnace?

Christopher Jones, P.Eng.
Tel: 416.644.4226 • Toll Free: 1.888.425.7255 x 527

From: Cheney [mailto:chenyu73 at gmail.com]
Sent: Friday, November 14, 2014 5:10 PM
To: Jones, Christopher
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] 90.1-2010 Appendix G heat source question

Hi Chris,

1. >5 floors should be system 7 with hybrid heating source?
2. The selection of system for those special spaces in the building is based on the heating source for the main building (Please see user's manual p. G-28 for details). That's why you pick up system 3 which should be fossil fuel furnace. You can not use predominate heating source here.

Best Regards,
Cheney
Connect with me and view my  [http://press.linkedin.com/display-media/209/4]  http://lnkd.in/bqQf52i

On Fri, Nov 14, 2014 at 1:01 PM, Jones, Christopher <cjones at halsall.com<mailto:cjones at halsall.com>> wrote:
The proposed design has 9 floors and has heat recovery chillers, air-to-water heat pumps and natural gas boilers for the heating plant.  Based on Table G3.1.1A, I selected System 5.  Based on G3.1.3.2, I selected electric boiler as the predominate heat source is electric.

Based on G3.1.1 exception b.  I have some spaces that require a single zone system.  As the building has Fossil/Electric Hybrid heating, I select System 3 – PSZ-AC.  My question is: should the heat source of these systems be gas furnace as per Table G3.1.1A or should I select electric resistance as the predominate heat source is electric?

Thanks for any insights!


Christopher Jones, P.Eng.
Halsall Associates
Tel: 416.644.4226<tel:416.644.4226> • Toll Free: 1.888.425.7255 x 527<tel:1.888.425.7255%20x%20527> •  www.halsall.com<http://www.halsall.com/>
Vancouver • Calgary • Sudbury  • Burlington • Toronto • Ottawa
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