We collected information about Cooling Unmet Hours for you. Follow the liks to find out everything about Cooling Unmet Hours.
https://www.iesve.com/support/faq/pdf/unmet-load-hours.pdf#:~:text=Unmet%20load%20hours%20are%20any%20hours%20of%20operation,system%20serving%20a%20space%20cannot%20maintain%20space%20setpoint.
https://www.iesve.com/discoveries/article/16769/unmet-load-hours-part-1
Any hour with one or more zones with an unmet cooling load or unmet heating load is defined as an unmet load hour. There are further specific rules for ECB vs. PRM, as described below. Energy Cost Budget method (ECB): Unmet load hours for the proposed design or baseline building designs shall not exceed 300 hours.
https://www.iesve.com/support/faq/pdf/unmet-load-hours.pdf
outside the control ranges for both heating and cooling are collectively the Unmet Load Hours. A space temperature is considered out of range (under-heated or under-cooled) for any hour when the average temperature for that hour is below the heating setpoint less the control band tolerance or above the cooling setpoint plus the control band tolerance. The shared hours
http://www.energysoft.com/faqs/how-do-i-fix-my-unmet-load-hours/
Unmet Load Hours that are reported basically indicate how many hours the Zone will be outside of the thermostat setpoint. You cannot adjust that setpoint, Title 24 restricts the input. There are a number of causes for this message, but the net result is the zone either has too little heating, too little cooling, or inadequate airflow to maintain comfort conditions in the space, as reported by …
http://tranecds.custhelp.com/app/answers/detail/a_id/708/~/resolving-unmet-load-hours
When the HVAC System Minimum Timestep was set to the most detailed setting (1 minute), the change in unmet hours for this specific scenario was dramatic, with only 36 unmet hours occuring. Using 1 minute is extreme and may not be suitable for your situation. Using 1 minute could adversely impact the performance and calculation time of your model.
http://tranecds.custhelp.com/app/answers/detail/a_id/2/~/how-to-reduce-unmet-hours-in-your-trace-700-project-files.
Unmet hours can occur for a very wide variety of reasons and are restricted to hours when the excess load on a coil is at least 1% greater than the design coil capacity, and at least one room attached to that coil is in excess of +/- 1.5°F of the thermostat setpoint for that hour. Both criteria are required for an unmet hour to occur.
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