High cop

[mad-dawg]

This is beyond my brain today!
If you have a room heating load of say 8kW and install a 12kW inverter heat pump system will the COP be higher than a 8kW system installed for the same heating load.
The thinking is this, the evaporator and condenser coils are oversized and the compressor will never need to run at full speed so power consumption will be less for the given capacity than the correctly sized system.
Am I missing something here?
Thanks

[sterl]

The larger heat exchangers and slow speed of the compressor will make for a more efficient heat pump until the controls or the limitations of the compressor get in the way of you taking advantage of those bigger heat exchangers....And at nominal 66% loading it won't be an issue. But if your control arrangement lets this system drop to (say) 20% speed when the actual requirement is only 30% of the nominal: almost any type of compressor and at least a few inverters are going to give you issues.

[chilliwilly]

Twas on the day of salstice winter, that solitude in the retarded form, beggatted a poster of motor terminals name. One more time a key did he use, to twist the mood of forum folk, "like the power of time on the mantle peice, replenishment not at this moment needed." But still persistent in his quest, which may include potential discipline maybe yet, or even attention from moderator senses, along with vendetta of forum folk.

[MikeHolm]

ah, you speaketh the truth, chilly