Question-and-Answer Resource for the Building Energy Modeling Community
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I'm not familiar with what Appendix G requires for sizing runs, but I've always seen the ideal loads air system used for them, which conceptually makes a lot more sense than computing the COP recursively from some assumed COP.
With the ideal loads system, the sizing run Q is simply the peak thermal energy demand from the system's zones, and issues like the fan energy or COP simply don't exist. Is there a reason why using the ideal loads air system Q wouldn't work here?
Note: I realize this is an old question, but I think resolving this would still be helpful.
