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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/support/faq/pdf/unmet-load-hours.pdf
Unmet load hours are any hours of operation when conditioned spaces are outside the throttling range for heating or cooling controls. That is, they are the hours in a year that the HVAC system serving a space cannot maintain space setpoint. If unmet load hours for multiple spaces coincide (occur in the same hour), they are
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 …
https://www.iesve.com/discoveries/article/16769/unmet-load-hours-part-1
An unmet load hour is any hour of any day of the year when one or more zones in the building are outside of their temperature control range. Typically, this translates to an hour in which one or more zones is outside of the thermostat setpoints plus or minus one half of the temperature control throttling range.
https://comnet.org/23-unmet-load-hours
Unmet load hours can occur because fans, air flows, coils, furnaces, air conditioners or other equipment is undersized. Unmet load hours can also occur due to user errors including mismatches between the thermostat setpoint schedules and HVAC operating schedules or from other input errors, for instance, high internal gains or occupant loads. The term, as used in this …
http://tranecds.custhelp.com/app/answers/detail/a_id/708/~/resolving-unmet-load-hours
Unmet load hours occur for numerous reasons. Some of these unmet hours are generated due to simulation settings. Others are generated due to user inputs that limit the ability of the system in question to control the given space, whether intentional or unintentional.
https://energy-models.com/blog/6-tips-reducing-unmet-load-hours
An unmet load hour occurs when the HVAC system lacks the capacity to keep the design setpoint within the throttling range for the duration of an hour. The other caveats are that the space must be conditioned, and in operating mode (occupied). Why do unmet load hours affect you? Unmet hours will stop a “completed model” from reaching completion.
https://unmethours.com/questions/
A question-and-answer resource for the building energy modeling community.
https://unmethours.com/question/525/tolerance-for-unmet-load-hours-for-leed/
unmet load hour: an hour in which one or more zones is outside of the thermostat setpoint plus or minus one half of the temperature control throttling range. Any hour with one or more zones with an unmet cooling load or unmet heating load is defined as an unmet load hour.
http://tranecds.custhelp.com/app/answers/detail/a_id/2/~/how-to-reduce-unmet-hours-in-your-trace-700-project-files.
Unmet load hours are triggered in TRACE when space conditions are outside of the thermostat setpoints. 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 …
https://energy-models.com/forum/ashrae-901-unmet-hours
performed (not just the occupied hours) * As per ASHRAE 90.1-2004, the unmet hours of the total building. should be less than or equal to 300 hours and the difference in the base. case and proposed case should be less than or equal to 50 hours. * If unmet load hours in the proposed building exceed the unmet load.
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