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

4lpha0ne schrieb:

How much photovoltaic power is generated under cloudy conditions? I have measured between 0.5-2 kW here.

We are not talking about photovoltaic systems here, but rather energy gains through the windows.

Bookstar schrieb:

We haven’t had a single day of sun in the past two weeks, so no solar gains either. If we didn’t heat for a few hours every day, the indoor temperature would be around 18°C (64°F). That’s no longer comfortable and not acceptable.

Bookstar schrieb:

We are not talking about photovoltaic here, but about solar gains through the windows.

Just because the sun isn’t shining brightly from a clear blue sky like in summer doesn’t mean it’s not shining at all or that no solar gains occur.
@4lpha0ne illustrated this by referring to the photovoltaic output. Sometimes you’re surprised that even when you look up and see an overcast sky, the photovoltaic system still runs at 30% capacity.

Anyway, if it doesn’t work for you, then it just doesn’t work. For us, it does.
There are no losses in comfort because the heating comes on if the indoor temperature deviates too much from the setpoint.

guckuck2 schrieb:

Just because the sun isn’t shining brightly from a clear blue sky doesn’t mean it isn’t shining or that there’s no solar gain.
@4lpha0ne made this clear when referring to the photovoltaic output.
Sometimes you’re surprised as a person looking up at a cloudy sky, yet the photovoltaic system is still running at 30% capacity.

Anyway, if it doesn’t work for you, then it simply doesn’t work. For us, it does.
There are no comfort losses, because the heating turns on if the indoor temperature deviates too far from the target.

That may be true for your photovoltaic system, but with windows it hardly helps at all.

We already have such wide eaves on the bungalow that the sun never shines in directly.

Out of curiosity, I calculated whether a gas system, air-to-water heat pump, or ground-source (brine-to-water) heat pump would be more cost-effective for my situation.

Parameters:
Air-to-water heat pump annual performance factor 4.0
Ground-source (brine-to-water) heat pump annual performance factor 5.5
Current energy prices (electricity 23 cents, gas 5 cents)
Investment based on my quotes from a few years ago
Subsidies included
Heated area 220 m² (KFW55 standard, energy consumption 4500 kWh heat output)
Consideration period 15 years

1st place: Gas approx. 1300 euros
2nd place: Air-to-water heat pump approx. 1800 euros
3rd place: Ground-source heat pump approx. 2200 euros

This confirms that gas is still by far the cheapest option. What really shocked me was that the ground-source heat pump would have cost nearly twice as much in my case.

Am I correct in assuming that the comparable calculation for a smaller area (let’s say 120-150 m² (1300-1600 ft²)) would look different or shift more in favor of the heat pump? After all, the fixed costs for gas (meter, chimney sweep, etc.) would have a greater impact here, wouldn’t they?