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https://leeduser.buildinggreen.com/forum/ashrae-901-2010-unmet-hours
Sep 07, 2017 · In LEED 2009 in accordance to ASHRAE 90.1-2007 the Unmet load hours for the Proposed Design shall not differ from unmet load hours for the Baseline Building Design by more than 50 hours. It is not so clear if now in the new version v4 this rate is canceled and if it is mandatory that the unmet load hours for the Proposed Design shall not exceed the unmet load hours for the Baseline …Estimated Reading Time: 40 secs
https://energy-models.com/forum/ashrae-901-unmet-hours
Oct 01, 2011 · * 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 hours in the baseline building by more than 50, then the size of equipment
https://www.iesve.com/support/faq/pdf/unmet-load-hours.pdf
ASHRAE Standard 90.1-2007 Appendix G imposes limits on unmet load hours when using the Performance Rating Method in section G3.1.2.2 Equipment Capacities. Unmet load hours for the proposed design or baseline building designs shall not exceed 300 (of the 8760 hours simulated), and unmet load hours for the
https://unmethours.com/question/22504/part-load-performance-for-ashrae-901/
This is a very common dilemma for modeling against ASHRAE 90.1 as they don't provide default curve coefficients. Full load efficiency at rated conditions is easy to define but it's true there are an infinite combination of part-load curve possibilities that may equate to the same IEER/IPLV/NPLV.
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