Hi all,
We are using EnergyPro v6 for our LEED modeling. Per the Advanced Energy Modeling for LEED Technical Manual v2.0 p.16, the DOE2 reports show the unmet load hours as a throttling range that needs to be under 3.4%. The % is the equivalent of <300h for compliance with the ASHRAE and LEED requirements. The guide does not clarify if the requirement applies to both system and plant throttling range. Per the word selection it seems that it focuses on the system %.
My question is whether for the LEED submission using a DOE2 report, both system and plant need to be under 3.4% as a throttling range?
Reason being that in LEED submissions with other software, the unmet load hours are approached differently showing an overall discrepancy between baseline and proposed for heating and cooling, and are not broken down at both a system and plant level.
Please advise.
Regards,
Maria
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5907 thumbs up
October 26, 2017 - 3:20 pm
The overall system should not exceed 300 hours including both the plant and the system levels. Sometimes with DOE2 software you need to dig a bit deeper than the BEPS/BEPU reporting. Many of those system and plants hours could be coincident and therefore are double counted. I can't remember the name of the DOE2 report you will need to find but I do recall seeing one that was used when the throttling range percentage was too high. If you can't find it ask again and I will dig it out.