I neglect the consumption of the regulation (1 to 2W).
statements
Measured on August 20, 2007: 357h and 226 kWh, average consumption: 633,1W.
Measurement on August 23, 2008: 1073h and 680 kWh, average consumption: 633,7W
So already, we can say that the measurements are fairly reliable and precise because the average consumption over the 2 periods is identical.
The pump power is given for 660W (this is what PM indicates when the pump is in steady state). The "missing" 27W correspond to the start-up period: the power progressively increases until reaching 660W.
Calculs
a) Average pumping hours per day: (1073 - 357) / (365 -3) = 1,97h or 1h58minutes
b) Average consumption per day: 1,24 kWh.
c) Estimated average COPA is 50 (for information, the COPA of a heat pump does not exceed 4 !!) therefore energy recovered per day on average: 62 kWh thermal or the gross energy equivalent of 6 liters of fuel oil per day.
Details:
Flow rate (according to P) 4000L / h
Cp 4,18
T ° entry 19,6
T ° 30,5 output
Delta 10,9
Power 50,62 kW
Pump power 0,66 kW
COP 76,7
Like on this forum we are honest we will speak in COPA and not in instant COP because what matters is the annual performance and not laboratory COP as all heat pump manufacturers give it.
So I estimate (pessimistically) at 35% the various losses in the storage buffer (I remind you that it is a concrete tank of approximately 70L), ie a "usable" COPA of approximately 000.
d) Finally and this is what counts: fuel oil savings achieved thanks to this installation: 6 * 365 = 2190 XNUMX L per year.
It is consistent with the needs of the house ...
