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https://energy-models.com/blog/6-tips-reducing-unmet-load-hours
Mar 20, 2015 · 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.
http://tranecds.custhelp.com/app/answers/detail/a_id/2/~/how-to-reduce-unmet-hours-in-your-trace-700-project-files.
Aug 03, 2015 · 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 hour.
https://www.iesve.com/support/ve/knowledgebase_faq/faq/1668
See the Unmet Load Hour Troubleshooting Guide.. This guide is designed to help reduce or eliminate unmet load hours in a model. You should begin by understanding what an unmet load hour is, using the “Definition” section of this document.Next, you should identify when and where unmet load hours occur in your model.
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 …
https://www.iesve.com/support/faq/pdf/unmet-load-hours.pdf
unmet load hours of the proposed design. If unmet load hours for the proposed design or baseline building design exceed 300, simulated capacities shall be increased incrementally and the building with unmet loads resimulated until unmet load hours are reduced to 300 or less. Alternatively, unmet load hours
http://tranecds.custhelp.com/app/answers/detail/a_id/708/~/resolving-unmet-load-hours
Jul 23, 2019 · When the control setpoint or driftpoint is not maintained, the given space setpoint is deemed "unmet" for that interval of time. Energy plus outputs "hours not met" and will give 0.25 hours to a 15 minute timestep, for example. Unmet load hours occur for numerous reasons. Some of these unmet hours are generated due to simulation settings.
https://www.shareddocs.com/hvac/docs/1004/public/0e/hap_ehelp_021.pdf
Proposed unmet load hours cannot exceed the Baseline by more than 50 hours. When either of these limits is exceeded, the energy model must be adjusted to reduce unmet load hours to bring them within the required limits. Often excessive unmet load
https://www.eng-tips.com/viewthread.cfm?qid=268022
Apr 22, 2010 · RE: Carrier HAP unmet load hours. marcoh (Mechanical) 24 Mar 10 07:53. Probably need to look at the your thermostat setpoints and more importantly the thermostat throttling range which needs to be realist and not too small. I normally set the cooling setpoint 23oC …
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