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

[Nicholas Blanton]

Chris - Here is some insight from a comparable situation, although the system types are different:

Three C&S office buildings that I've modeled have energy recovery ventilators (ERV-located on the roof) that use gas for heating. The terminal units throughout the building contain electric heating coils. The gas heating coil in the ERV is intended to be used in the following scenarios:


1)      The energy wheel goes down

2)      To keep the ERV discharge air temperature above 32F (heat air so the discharge is a minimum of 40F for freeze protection purposes)

For simulation purposes, I have found that, given the high efficiencies of the energy wheel and given the TMY3 weather data, the gas energy consumption is either not engaged at all or is sufficiently small compared to the electric energy consumption (<10% of total heating energy consumption).

For this reason, I have been able to justify going with System 4 or System 8. The energy savings of the proposed building when compared to the gas/electric hybrid baseline building is much less than the all-electric baseline building.

Regards,

Nicholas E Blanton LEED AP BD+C
Mechanical Engineer

Arup
1120 Connecticut Avenue NW  Suite 1110  Washington DC 20036  USA
t +1 202 729 8220    d +1 202 729 8241
m +1 505 228 4154
www.arup.com<http://www.arup.com/>

From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Jones, Christopher
Sent: Friday, November 14, 2014 4:01 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] 90.1-2010 Appendix G heat source question

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 * Toll Free: 1.888.425.7255 x 527 *  www.halsall.com<http://www.halsall.com/>
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