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
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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.
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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Christopher,
I agree with Jim.
I typically model all conditioned spaces including semiheated spaces with heating and cooling thermostat schedules, except for heating-only zones that meet the criteria for Systems 9/10 in Appendix G, for which I leave the cooling thermostat schedule undefined. I may enter relaxed design conditions for zones that aren?t intended to have tight temperature control (using DESIGN-COOL-T and DESIGN-HEAT-T in DOE-2/eQUEST), and use correspondingly relaxed thermostat schedules for those zones. If there are unmet hours in the proposed design that I can?t address by relaxing the thermostat schedules even further, than I might leave the heating and/or cooling thermostat schedules undefined to represent floating with no thermostat control (which results in no reported unmet loads to have to explain). I keep all design conditions and thermostat schedules identical in the baseline as required by Appendix G.
Regards,
~Bill
William Bishop, PE, BEMP, BEAP, CEM, LEED AP | Pathfinder Engineers & Architects LLP
Senior Energy Engineer
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One should also point out that a corridor is a transient space and is
therefore not critical.
Peter Simmonds, Ph.D., FASHRAE, FIBPSA, FFTI
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