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CBECC Title 24 Part Load Curves Appendix 5.7

asked 2023-03-13 18:21:29 -0500

updated 2023-03-17 09:06:31 -0500

In the California Title 24 alternate calculation manual, several part-load efficiency criteria for fans, pumps, chillers, etc. all reference they are included in Appendix 5.7 though I am having trouble finding where this document lives in the compliance software, CBECC. I can install CBECC, and I can see the documents with Appendix (or App) in the name, and 5.7 is not one of them. This information use to be in an excel file, which I have from 2016, though it would be great to have an updated version.

Does anyone know if the part-load information is buried in one of the library text files of CBECC 2022?

C:\fakepath\2016 ACM Excel File App 5-7.png

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answered 2023-03-14 12:01:29 -0500

Neil, Here is the path to the most current version associated with the 2022 release.

I can't think of much that has changed since 2016, and it does not contain curves for some of the newer E+ equipment, like A2WHPs. Also, this only summarizes curves used for the E+ sim engine, and currently does not include curves that are hard-coded or used in the CSE sim engine. Also, small (<65KBtu/hr) AC/HP cooling EIRfT performance curves are now curve maps based on input SEER/EER, as described in the NACM.

The spreadsheet is ultimately used to generate the text for the Library_PerformanceCurves-T24N.rule file, and the .rule file is what is used in the program, so ultimately the text file is the "final" reference.

Hope this helps, David

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answered 2023-03-14 09:17:34 -0500

Neil, It looks like the curve data from the spreadsheets is included in the .rule text file at: CBECC 2022 Data/Documents/RulesetSource/T24N/Rules/Library/Library_PerformanceCurves-T24N.rule

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Asked: 2023-03-13 18:21:29 -0500

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Last updated: Mar 14 '23