[Bldg-sim] Selection of System 9 or 10 for heated only spaces

[Javed Iqbal]

Hi,

In scenarios where both gas and electricity are used as a heating source
for the proposed system—for example, in the case of water loop heat pumps,
which might be served by a gas-fired boiler, or a specific building with
gas-fired dedicated outdoor air systems (DOAS) and all electric terminal
units for heating—both electric and gas are counted toward the area served
by the respective fuel type. Proposed building designs with systems like
these are considered “hybrid” systems and map to the *fossil-fuel baseline*.

Hope this helps!!

On Tue, Jul 17, 2018 at 4:24 PM Mayank Bhatnagar via Bldg-sim <
bldg-sim at lists.onebuilding.org> wrote:

> Dear All,
>
> We have a residential project with hybrid heating source (gas+electric)
> to condition the dwelling and corridor spaces. There are few electric
> heaters serving stairwells and storage spaces. As per exception 'e' of
> section G3.1.1, ASHRAE 90.1-2010, the thermal zones designed for heating
> only systems in the proposed design, serving storage rooms, stairwells etc.
> and not exhausting or transferring air from mechanically cooled thermal
> zones in the proposed design shall use system 9 or 10 in the baseline
> building design.
>
> The query is whether the selection of system 9 or 10 is based on building
> heating source (hybrid in this case) or as per unit heater's heating source
> (electric).
>
> Thank you.
>
> Regards,
>
> Mayank Bhatnagar
>
> Senior Project Manager
> *Environmental Design Solutions Pvt. Ltd. [EDS]*
> D - 1/25
> Vasant Vihar
> New Delhi - 110057
> India
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-- 

Javed Iqbal, LEED AP, CEA
Sr. Energy Analyst
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