Air cooled Heat pump Fan behaviour
Air cooled Heat pump Fan behaviour
(OP)
I have measured air flow in an air cooled heat pump in summer season and winter season, and I have found that air flow is much greater in winter than in summer (2200 m3/h in summer vs 3700 m3/h in winter), when I've always thought it was the opposite.
I believed it was much higher in summer, because in winter the coils acts as an evaporator, then there is water reducing the air flow surface and air density and viscosity is higher and the pressure drop increases. But in fact, as air density is much higher in winter, maybe that's the reason in my experiments I have found that actual heating season flow is higher than summer season.
But does anybody know if this is the actual reason?
Thanks everybody, and best regards
I believed it was much higher in summer, because in winter the coils acts as an evaporator, then there is water reducing the air flow surface and air density and viscosity is higher and the pressure drop increases. But in fact, as air density is much higher in winter, maybe that's the reason in my experiments I have found that actual heating season flow is higher than summer season.
But does anybody know if this is the actual reason?
Thanks everybody, and best regards





RE: Air cooled Heat pump Fan behaviour
RE: Air cooled Heat pump Fan behaviour
It may be that you have a 2 speed or a VFD condenser fan motor. The capacity and the efficiency of a heat pump depend upon adequate airflow. There should be about 400 to 500 cubic feet per minute (cfm) airflow for each ton of the heat pump's air-conditioning capacity. Efficiency and performance deteriorate if airflow is much less than 350 cfm per ton.
RE: Air cooled Heat pump Fan behaviour
Actual M3/Hr =
(Nm3/Hr x (273 + measured temp. deg. C)) / 273
considering that there is not much pressure difference.
The pressure difference is basiclayy due to the altitude.
Or the standrad formula is
(P1V1)/T1 = (P2V2)/T2