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https://www.iesve.com/support/faq/pdf/unmet-load-hours.pdf#:~:text=1.0%20Definition%20Unmet%20load%20hours%20are%20any%20hours,system%20serving%20a%20space%20cannot%20maintain%20space%20setpoint.
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A question-and-answer resource for the building energy modeling community.
https://bigladdersoftware.com/projects/unmet-hours/
Unmet Hours is a resource for the building energy modeling community, built by the community. We are counting on your support and participation to continue its success. Unmet Hours was developed by Big Ladder Software with the generous support and collaboration of IBPSA-USA. Further Reading. Features Acknowledgments. Features
https://www.iesve.com/discoveries/article/16769/unmet-load-hours-part-1
Unmet load hours for the proposed design or baseline building design shall not exceed 300 (of the 8760 hours simulated). Unmet load hours exceeding these limits shall be permitted only by approval of the rating authority, provided that sufficient evidence is provided to demonstrate that the accuracy of the simulation is not significantly compromised by these unmet loads. IECC 2018. The …
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 the CBECC engine.
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://proxy.unmethours.com/help.html
Unmet Hours is a question-and-answer site for building energy modelers and others interested in building performance simulation and analysis. It is built and run by you, the building energy modeling community. Unmet Hours is different from the traditional mailing lists and …
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