ᐅ Underfloor heating with an air-to-water heat pump. House gets too warm when the sun is shining.
Created on: 4 Dec 2019 14:18
C
chewbacca123
Hello everyone,
I have a general question.
We moved into our new build four months ago. The living area on the ground floor has three large floor-to-ceiling windows facing south. We have underfloor heating and an air-to-water heat pump.
It provides a really comfortable temperature inside the house, but we have a problem – whenever the sun is shining in winter, even if it’s -2°C (28°F) outside, the temperature suddenly rises to 24°C (75°F) in the living room. It gets uncomfortably warm in here, and the underfloor heating can’t be turned down quickly.
Should we assume that the large floor-to-ceiling windows are responsible for the heat gain? A photo of the south-facing side of the house is attached.
What would you do – always lower all the blinds as soon as sunlight is forecast? That seems quite annoying...
We have motorized blinds controlled by Somfy. Would you consider buying a sensor that automatically lowers the blinds at a certain temperature?
Thanks in advance for your replies.
I have a general question.
We moved into our new build four months ago. The living area on the ground floor has three large floor-to-ceiling windows facing south. We have underfloor heating and an air-to-water heat pump.
It provides a really comfortable temperature inside the house, but we have a problem – whenever the sun is shining in winter, even if it’s -2°C (28°F) outside, the temperature suddenly rises to 24°C (75°F) in the living room. It gets uncomfortably warm in here, and the underfloor heating can’t be turned down quickly.
Should we assume that the large floor-to-ceiling windows are responsible for the heat gain? A photo of the south-facing side of the house is attached.
What would you do – always lower all the blinds as soon as sunlight is forecast? That seems quite annoying...
We have motorized blinds controlled by Somfy. Would you consider buying a sensor that automatically lowers the blinds at a certain temperature?
Thanks in advance for your replies.
Ötzi Ötztaler3 Oct 2020 10:15
Zaba12 schrieb:
The heating system was definitely not optimized. Well, you probably have a significantly higher energy consumption compared to a properly adjusted system. And then you prefer to cut back on comfort, which likely doesn’t even come close to compensating for the extra consumption caused by the poor settings. On top of that, the heat pump wears out faster...
A somewhat odd but fitting comparison: it’s like driving a car with the handbrake partially engaged, repeatedly accelerating full throttle in second gear. Instead of releasing the brake, shifting up two gears, and driving more smoothly, you’d rather complain about high fuel costs and drive at 30 km/h (20 mph) outside town to save fuel. And after a few years, you’re frustrated because the car ends up with costly repairs.
Ötzi Ötztaler schrieb:
Well, you probably have a significant increase in energy consumption compared to a proper setting. And then you prefer to save on comfort, so you likely don’t even come close to compensating for the increased consumption caused by the poor setting. Besides, the heat pump will break down faster...
A somewhat odd, but not entirely inappropriate comparison: It’s like driving a car with the handbrake half engaged, constantly accelerating hard in second gear. But instead of releasing the brake and shifting up two gears, you’d rather complain about high fuel costs and only drive 30 km/h (about 20 mph) outside of town to save fuel. And after a few years, you get upset because the car has high repair costs.At least this year stillÖtzi Ötztaler3 Oct 2020 10:18
Zaba12 schrieb:
At least still this yearRosa Forum
chewbacca1233 Oct 2020 12:09I also had much higher consumption with the "factory settings" from our heating technician. After optimization with the help of the forum, it became 10,000 times more efficient.
Ötzi Ötztaler schrieb:
Actually pointless, especially now with the high outside temperatures, a well-adjusted heat pump runs with performance factors beyond 6.
Have you considered the usual tips, like disabling ERRs, lowering the heating curve, closing the bypass valve, and so on?
My approach: Optimize the heat pump for maximum efficiency. Then I enjoy comfortably warm conditions at a low cost in the well-insulated house. If it doesn’t save at least 15 euros more per month, I’d rather just heat less... Ours is really meticulously set up, but this Novelan nonsense currently only delivers a performance factor of 3 to 4. And yes, the ground loops are tightly and carefully installed, etc....
D
Daniel-Sp3 Oct 2020 13:45Bookstar schrieb:
Ours is really precisely adjusted, but this Novelan nonsense currently yields no more than a coefficient of performance of 3 to 4. And yes, the loops in the floor are also laid closely and carefully, etc....That’s surprising, which model do you have? Currently, with still mild temperatures, the heating operation should easily achieve a coefficient above 4.