Question-and-Answer Resource for the Building Energy Modeling Community
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Keigo, As usual, you are giving thoughtful consideration to the problem - I appreciate that very much. I think there are two choices:
1) EnergyPlus normally has curves which are based on real equipment and thus are reasonable for use. So... feel confident to use them.
2) As you note, the E+ curves may be out of date for equipment which has seen ongoing improvement. In that case, you can justify and use your "best understanding" for a new curve - much like you are doing already.
Daikin (or other manufacturer) may be able to give you better information than what is published, so it's worth asking for it. On the other hand, the impact of greater accuracy for one curve among many - plus the MANY other variables in your simulation - is probably small. ie, it's probably not worth spending a lot of time trying to get it "perfect".
