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

Mayank Bhatnagar mayank.23aug at gmail.com
Wed Jul 18 21:30:59 PDT 2018

Thank you Sheila and Javed. However, there is still a gap in understanding
the exceptions. The question is whether the exception should be combined as:

1. Exception "a" says about dominant and non-dominant space type; and
source of heating for more than 20,000 sqft area.
2. Exception "b" says about use of system 3 and 4 for different cooling
load and/or different schedule based on building heating source type
(explicitly written).

However, for exception "e" should it be combined with exception "b" or "a"?

Thanks again!


On Tue, Jul 17, 2018 at 8:27 PM, Javed Iqbal <javedvit at gmail.com> wrote:

> 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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