[Bldg-sim] ASHRAE 90.1-2013 Appendix G - Baseline Fuel Source Mapping

[David Eldridge]

Not sure if I missed a response to this or not...sorry this got lost in my draft folder for a few days.

What you've stated as the problem is exactly why the standard takes the other approach - if the baseline system costs less to operate (and may also have lower source energy) then why shouldn't it be the baseline system?

The standard is looking to establish the minimum requirements, which shouldn't be "Best Practice" necessarily but reflect a constantly advancing minimum threshold.

Choosing to use a system that's less cost efficient is certainly allowable and, but requires making other improvements in the building to offset what is traded off by using the electric resistance heating system.

Note that while the requirements of the standard do change based on climate, it isn't based on geography directly, I have understood in the past that the approach is for national average utility rates to set the requirements. I can think of several reasons why NYSERDA specifically would take a different approach, but in general for country-wide adoption I would expect gas heat to be the reasonable baseline in climate zones that need more heating. Is it debatable for zones 3b and 3c, perhaps. I'm pretty comfortable with fossil fuel baseline in CZ 4-8.

Separate topic: you are seeing GSHP and VRF systems use (much) more energy cost than the baselines?

David



David S. Eldridge, Jr., P.E., LEED AP BD+C, BEMP, BEAP, HBDP
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From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Madhav Munshi via Bldg-sim
Sent: Thursday, November 01, 2018 4:08 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] ASHRAE 90.1-2013 Appendix G - Baseline Fuel Source Mapping

Hello Everyone,

Does anyone know why the AHSRAE 90.1-2013 Appendix G Table G3.1.1-3 requires a Baseline HVAC system that is fossil fuel based for climate zones 3b,3c and 4-8? If my Proposed Design has an electric GSHP or VRF system, there is very little chance that the energy cost of this Proposed Design is going to be lower than a Baseline with a gas furnace/ boiler. Why does it matter for ASHRAE where the building is located and type of heating system selected for a project?

For folks in the New York, NYSERDA has amended this map to avoid this fuel switch which makes total sense.

[cid:image006.jpg at 01D471FF.EBC60790]

Thank you

Madhav

MADHAV MUNSHI | LEED AP BD+C | BEMP
Associate - Senior Energy Analyst
mmunshi at kohlerronan.com<mailto:mmunshi at kohlerronan.com>

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