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

Zaba12 schrieb:

It’s stated above. The heat pump has been off since 1:30 AM because the house hasn’t been able to cool down since sunrise. This is already the third day in a row where I only have one heating cycle. Meanwhile, I’m sitting here in a T-shirt and shorts. The ground floor is at 25.3°C (77.5°F).

Well, the screed still needs to reach 27°C (81°F), and the sun only provides power for a few hours. The rest of the time, everything should be cooling down. For example, we also have 26°C (79°F) on the ground floor now, but the heat pump is running. The basement and north side of the upper floor still need heating. Plus, hot water is required. And at night, too, since the indoor temperature certainly drops by about 3°C (5°F) after a few hours. I’ll observe this today after sunset.

Take a look at my post from yesterday at 7:53 PM. Why should the heat pump turn on at those temperatures? At the top, the large unit is currently at 22.4°C (72.3°F) and the smaller one at 21.6°C (70.9°F). As I said, the heat pump has been off since 1:30 AM. Better try not to block any sunlight. This is how the last 50 hours looked.

We do not use shading. But as you can see, the screed temperature is 28°C (82°F). Even at an indoor temperature of 25°C (77°F), heating is actually necessary because the screed setpoint is so high due to the low outdoor temperature. The room temperature does not control your heating demand. And as mentioned, you only get sun on the south side for an extended period...

I believe you, but others here have a heating demand that is significantly higher—at least double, and I have almost triple!!!

Where would that heat come from in your case, or how well insulated would the house have to be to have a heating demand below 50 kWh at -10°C (14°F) with that size including a basement? That seems too good to be true.

Bookstar schrieb:

We don’t use shading. But as you can see, the screed is at 28°C (82°F). Even with an indoor temperature of 25°C (77°F), heating is actually necessary because the screed’s setpoint temperature is that high due to the low outside temperature. The room temperature does not determine your heating demand. And as mentioned, sunlight is only on the south side for an extended period...

I do believe you, but others here also have a significantly higher heating demand, at least double mine, and mine is almost triple!!!

Where would it come from in your case, or how extremely well insulated would the house have to be to have a heating demand below 50 kWh at -10°C (14°F) for that size with a basement? That sounds too good to be true.

All I can show you are my heat pump data and temperature readings.

You don’t have to run that experiment this winter anymore, but what do you do in your basement that you heat it 24/7? Is it worth it for you? Are you currently working from home there? Of course, I also heat my basement, but only passively. Maybe, and this actually seems more likely to me, some of the expensively produced 100 kWh of heat is partially lost to the ground.

Zaba12 schrieb:

I can’t really show you more than my heat pump and temperature data.

You don’t have to do this experiment again this winter, but why do you heat your basement 24/7? Is it worth it for you? Are you currently working from home down there? Of course, I heat my basement too, but only passively. Perhaps, and this seems more likely to me, some of the costly 100 kWh of heat produced is lost into the ground.

If I don’t heat the basement, cold air rises into the ground floor and upper floor. Also, I have two living spaces down there which should be kept at around 19 to 20°C (66 to 68°F).

Bookstar schrieb:

If I don’t heat the basement, cold air rises up to the ground floor and the upper floor.

I’m starting to think that your heat pump is working quite well, but the house itself is the problem. Something like this really shouldn’t happen—it shouldn’t get that cold upstairs.