ctscasemod
02-10-2022, 11:47 PM
Hey everyone,
For educational purposes I am trying to understand efficiency figures in variable speed units.
I understand that, with lower compressor speeds there is a lower energy consumption overall. But I don't fully understand why efficiency increases at part load. I'm guessing now both the evaporator and condenser are oversized, since there is less refrigerant for a given surface area, which would presume heat can be transferred with a lower differential pressure - hence less strain on the compressor - But if this was all, why wouldn't manufacturers just offer variants with larger coils?
Also, with a lower differential pressure / head pressure - what would be the performance where the inside unit is expected to release heat, such as a heat pump in the winter?
What about the fans?
Is it best to throttle the fans back together with the compressor, or have them run full speed to make better use of the available coil surface area?
Thanks for any clarifications :-)
For educational purposes I am trying to understand efficiency figures in variable speed units.
I understand that, with lower compressor speeds there is a lower energy consumption overall. But I don't fully understand why efficiency increases at part load. I'm guessing now both the evaporator and condenser are oversized, since there is less refrigerant for a given surface area, which would presume heat can be transferred with a lower differential pressure - hence less strain on the compressor - But if this was all, why wouldn't manufacturers just offer variants with larger coils?
Also, with a lower differential pressure / head pressure - what would be the performance where the inside unit is expected to release heat, such as a heat pump in the winter?
What about the fans?
Is it best to throttle the fans back together with the compressor, or have them run full speed to make better use of the available coil surface area?
Thanks for any clarifications :-)