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How can I set the unmethours range in OS?

asked 2016-10-21 08:57:06 -0500

poppo92's avatar

updated 2016-10-21 10:32:34 -0500

In openstudio I run the simulation and I see the unmethours. But what is the range of the software? Where can I see and define the range?

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answered 2016-10-21 09:29:18 -0500

gokul's avatar

updated 2016-10-21 09:30:27 -0500

image descriptionHi, I don't think there is a way to specify if the simulation should terminate if the number of unmet hours goes beyond a specified value.(If that was your question?) Since the simulation is performed annually, the number of unmet hours can range from 0 to 8760, on both the cooling and heating side. You can, however, specify a tolerance limit for the temperature difference above and below the zone setpoint temperatures, which OpenStudio uses for calculating unmet hours. This is done in the Output Control Reporting Tolerances sub-tab under the Simulation tab (shown in figure.) If you are interested in reducing unmet hours, the first step would be to figure out which of your zones have unmet hours and whether these occur during cooling or heating. The Time Setpoint Not Met report under the System summary in the energyplus output file would give you the unmet hours by zone. You would then go about reducing unmet hours. There are numerous posts on how to do this depending on the issue on unmet hours. maybe a good place to start. Hope this answers your question.

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sorry, my question wasn't totally correct. I was meaning the range of temperature of the unmethours. I would like to see and change the range of temperature, for excample 20-26 C°, or 22-26 C° it possible? thank you

poppo92's avatar poppo92  ( 2016-10-21 11:10:08 -0500 )edit

You can assign different heating and cooling setpoint schedules using the thermal zones tab. If you would rather alter the existing schedules, then use the Schedules tab.

David Goldwasser's avatar David Goldwasser  ( 2016-10-21 11:16:29 -0500 )edit

ok..anyway my building has no HVAC system, because thickness of walls is very high. Is it possible to have unmethours output even if I don't have HVAC?

poppo92's avatar poppo92  ( 2016-10-21 15:31:59 -0500 )edit

@poppo92, you can still have thermostats even if you don't have an HVAC system serving it. I believe in that case unmet hours will still be reported.

David Goldwasser's avatar David Goldwasser  ( 2016-10-21 15:50:12 -0500 )edit

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Asked: 2016-10-21 08:57:06 -0500

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Last updated: Oct 21 '16