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

Sheila Sagerer ssagerer at comcast.net
Tue Jul 17 06:11:01 PDT 2018

Good morning Mayank,

There are 3 ASHRAE 90.1 interpretations I know of that identify various scenarios pertaining to Baseline system types in residential buildings. They are: 
IC 90.1-2010-26
IC 90.1-2007-11

My understanding is that the heating only spaces would have to use System 9 since the primary system is hybrid. If the electric consuming heating only spaces total 20,000 sqft or more, only then could System 10 be used. 

Sheila Sagerer
Senior Engineer, EIT, BEMP, LEED AP
Heapy Engineering
Ph: 937-224-0881
smsagerer at heapy.com

Sent from my iPhone

On Jul 17, 2018, at 6:54 AM, 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.


Mayank Bhatnagar

Senior Project Manager
Environmental Design Solutions Pvt. Ltd. [EDS]
D - 1/25 
Vasant Vihar
New Delhi - 110057
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