[Bldg-sim] Modeling zones that are conditioned but not controlled

Jones, Christopher Christopher.r.Jones at wsp.com
Fri Feb 23 08:20:39 PST 2018


Thanks Jim,
Your suggested approaches are in line with how I have been handing the issue.


Christopher R. Jones, P.Eng.
Technical Specialist
Sustainability & Energy

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Please consider the environment before printing...


From: Jim Dirkes [mailto:jim at buildingperformanceteam.com]
Sent: Friday, February 23, 2018 11:18 AM
To: Jones, Christopher <Christopher.r.Jones at wsp.com>
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Modeling zones that are conditioned but not controlled

My opinion:
If there is no thermostat, the design essentially says that a wide temperature variation is acceptable. You might consider arguing that those zones cannot have unmet load hours because the design does not attempt to control temperature.

For your own peace of mind (if your software allows it), you might also report hourly temperatures in the zone to confirm that temps don't go crazy unexpectedly during occupied hours.


On Fri, Feb 23, 2018 at 10:47 AM, Jones, Christopher via Bldg-sim <bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>> wrote:
I am wondering what others do for building zones that are conditioned but have no direct HVAC control. For example, a typical school will have a DOAS with perimeter radiation in exterior zones. There will be temperature and CO2 DCV in these occupied zones. The corridor will have transfer air and may have a couple of small supply diffusers from the DOAS but there is no thermostat to control the temperature in that corridor.

If there is no thermostat, there is no setpoint so how does one determine if the corridor has unmet loads? How would one model the corridor zone in the baseline case for Appendix G?


Christopher R. Jones, P.Eng.
Technical Specialist
Sustainability & Energy

[cid:image001.png at 01D3AC98.5477A510]
T +1 416-644-0252<tel:(416)%20644-0252>

2300 Yonge Street, Suite 2300
Toronto, ON M4P 1E4 Canada
wsp.com<http://wsp.com>


Please consider the environment before printing...



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