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Dear forum, My past practice has been to derive the COP need to produce a specific EER (e.g., the EER specified as minimum for ASHRAE 90.1)

I was "cleaning house" recently and revised the spreadsheet where that COP is derived. Now it doesn't work :( The derivation is shown below.

Using Eqn #3c for this example, the derived COP is 3.497 to produce an EER of 10.0, but E+ thinks the EER is 8.7. Something in my derivation must be off, but after reviewing it about 100 times, I can't see it.

If any of you has an equation that works properly, that would be a great help. If you can point out my reasoning flaw, that would be even better.

Thanks in advance.

Dear forum, My past practice has been to derive the COP need to produce a specific EER (e.g., the EER specified as minimum for ASHRAE 90.1)

I was "cleaning house" recently and revised the spreadsheet where that COP is derived. Now it doesn't work :( The derivation is shown below.

Using Eqn #3c for this example, the derived COP is 3.497 to produce an EER of 10.0, but E+ thinks the EER is 8.7. Something in my derivation must be off, but after reviewing it about 100 times, I can't see it.

If any of you has an equation that works properly, that would be a great help. If you can point out my reasoning flaw, that would be even better.

Thanks in advance.