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NC-2009 EAp2:Minimum Energy Performance

Unmet hours

Dear All, I am working on a project where the base case is packaged single zone and proposed case has split units. The unmet hours in proposed case is less than 300hours in each zone. But the total works out to be 500 hours. Is the appendix G unmet criteria for whole building or for individual spaces?. I am working on Visual Doe software. Does my project comply with the mandatory requirement of EA P2? Regards, Sundararaj

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Fri, 11/11/2011 - 19:22

An unmet load hour is an hour where at least 1 zone has loads not met. If 10 zones can't meet their loads at 8AM Monday January 14, that is 1 unmet load hour. You'll have to look at the model output to see how many unique unmet load hours you have. I would also verify that your thermostat schedules are compatible with your equipment schedules. Often unmet loads occur when the thermostat schedule calls for heating or cooling, but the equipment is scheduled off.

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