ᐅ Air-to-Water Heat Pump: Current Consumption and Data

Created on: 29 Sep 2020 11:06
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Bookstar
Hello!
I'll start.
Heated area 200m2 (2,153 sq ft)
KfW 55 standard
Mechanical ventilation with heat recovery
Current outdoor temperature 6°C (43°F)
Heating energy consumption including hot water 35 kWh
Electricity consumption 9 kWh
COP 3.88
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Bookstar
10 Feb 2021 15:50
I have a modulating machine, where the flow rate is usually around 900 to 1,000 liters per hour (l/h).

During defrosting, however, it requires more—reportedly up to 1,400 liters per hour (l/h) according to the manufacturer.
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Zaba12
10 Feb 2021 15:51
tomtom79 schrieb:

1400 is the operating flow rate, defrosting should be sufficient around 1100. However, if you lower the heating curve, a hydraulic issue becomes apparent, so it’s important to find a balanced solution.

Since January 31st, I have consumed 196 kWh of electricity, averaging about 19 kW, which is excellent, especially considering that last week temperatures were plus 10–12°C (50–54°F).

How do you read your electricity meters? I would like daily accurate data with a logfile, preferably standalone or via Somfy or EnOcean.

Up to just now, the total house consumption is 203 kWh. I read it from the inverter.
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Bookstar
10 Feb 2021 16:03
I am at 200 kWh for heating; household electricity is accounted for separately.
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Alessandro
10 Feb 2021 16:10
Bookstar schrieb:

I have a modulating unit, and the flow rate is usually around 900 to 1000 liters per hour (240 to 260 gallons per hour).

However, during defrosting, it requires more, allegedly up to 1,400 liters per hour (370 gallons per hour) according to the manufacturer.


Mine defrosts with 2,220 liters per hour (590 gallons per hour).
@tomtom79: A 28°C (82°F) supply temperature is already very, very low and, in my opinion, rather the exception.
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Zaba12
10 Feb 2021 16:11
Bookstar schrieb:

I’m at 200 kWh for heating, household electricity is additional.
Earlier, when you mentioned a 1.5 hysteresis, I thought the "short" breaks would make sense, but the disproportionately long runtime doesn’t fit with that.
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Bookstar
10 Feb 2021 16:27
In the last 8 hours, the system had a heat demand of 50 kWh and required 13 kWh of electricity.

The system is running very efficiently so far, but the heat demand is obviously very high.