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
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
Wonderful news on this freezing cold, sunny Monday morning (-10°C (14°F)). The heat pump took a 5-hour break yesterday and used only 95 kWh of heat in total. It consumed 33 kWh of electricity during that time. And this was with an average temperature of -9°C (16°F). That’s quite impressive, considering what is possible. If only it were always like this 🙂. Absolutely positive: It’s running completely trouble-free after the last technician visit *toitoitoi*
What did I change? I measured the return temperatures on the upper floor with an IR thermometer and noticed a large temperature difference. I adjusted the valves (Tacos). I also lowered the hysteresis from 2 to 1.5.
But I think a large part of the savings came from the sun, especially during the 5-hour heating break...
What did I change? I measured the return temperatures on the upper floor with an IR thermometer and noticed a large temperature difference. I adjusted the valves (Tacos). I also lowered the hysteresis from 2 to 1.5.
But I think a large part of the savings came from the sun, especially during the 5-hour heating break...
halmi schrieb:
Good to hear, but I have to point out an issue again. You have a modulating heat pump; something isn’t right, otherwise it wouldn’t shut down at an average temperature of -9°C (15°F).However, you shouldn’t forget that the heating system is somewhat oversized. It can’t modulate down that far because the sun was really shining yesterday.A
Alessandro15 Feb 2021 09:10As you may know, I have integrated a buffer tank and activated the ERR.
On Friday, I increased the heat pump’s heating curve (for loading the buffer) by 5K and reactivated the mixing valve.
So, the heating curves from the heat pump to the mixing valve differ by +5K.
The heat pump basically runs continuously and only stops briefly for defrosting and the grid operator lockout.
The shut-off return temperature is never reached, even though the ERR has been frequently opening and closing due to the sunny weather inside the rooms.
The heat pump modulates perfectly, and my electricity consumption on Saturday was 40kWh at -9°C (15°F), including two times hot water production.
I’m curious to see if it will work just as well at milder temperatures...
On Friday, I increased the heat pump’s heating curve (for loading the buffer) by 5K and reactivated the mixing valve.
So, the heating curves from the heat pump to the mixing valve differ by +5K.
The heat pump basically runs continuously and only stops briefly for defrosting and the grid operator lockout.
The shut-off return temperature is never reached, even though the ERR has been frequently opening and closing due to the sunny weather inside the rooms.
The heat pump modulates perfectly, and my electricity consumption on Saturday was 40kWh at -9°C (15°F), including two times hot water production.
I’m curious to see if it will work just as well at milder temperatures...
Total house energy consumption yesterday: 30.2 kWh
- Lots of hot water, heating only ran one cycle again
- Oven on for 4 hours
- Car charged for 30 km (19 miles)
- Dishwasher
- Washing machine
From tomorrow, temperatures will finally be above 0°C (32°F), so the snow will melt, the photovoltaic system will produce electricity, and the battery storage will be fully charged.
Then the ordeal with full grid supply will finally come to an end.
- Lots of hot water, heating only ran one cycle again
- Oven on for 4 hours
- Car charged for 30 km (19 miles)
- Dishwasher
- Washing machine
From tomorrow, temperatures will finally be above 0°C (32°F), so the snow will melt, the photovoltaic system will produce electricity, and the battery storage will be fully charged.
Then the ordeal with full grid supply will finally come to an end.
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