BEopt heating retention fraction in minisplit

asked 2019-12-05 18:51:00 -0600

anfa5917's avatar

updated 2020-01-03 09:08:20 -0600


I am trying to model our cold-climate spec'ed minisplit system for a house in Fraser, Colorado but I wanted to ask some questions about the custom input fields within the BEopt minisplit option.

I am specifically confused about the effect of the "Heating Retention Fraction" in respect to the performance of my chosen minisplit system. Since my chosen system is designed to have high efficiencies at low temperatures, as I understand it that should decrease our heating load since it can be more efficient. However, when I implement a value of "one" in my model, the annual heating load jumps considerably. I was wondering if anyone would be able to offer some insight on what I might be doing wrong, or misunderstanding about the software.

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What mfgr/model minisplit are you trying to model?

Heating Retention Fraction can be derived from NEEP spreadsheet data. Heating Retention Fraction of 1.0 is not realistic.

Eric Wilson's avatar Eric Wilson  ( 2019-12-09 10:27:09 -0600 )edit