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.
D
Daniel-Sp9 Oct 2020 15:31First, you need to have your heating system optimally adjusted and balanced. As seen in the pink forum, you are already working on that. Only then should you try one year without heating and one year with daytime temperature increase. Then hope that the winters are comparable. After that, you can compare the annual performance factor and make a decision...
Ötzi Ötztaler9 Oct 2020 15:34
Did you set it with or without tag elevation? If it’s so unclear whether it makes a difference, I would rather leave it out just in case... But I am curious whether it actually makes sense.
D
Daniel-Sp9 Oct 2020 15:39I’m still experimenting. Is it really useful? At least now my daily heating cycle no longer occurs at 2:00 AM. Whether this will make a difference during the winter remains to be seen. For the transitional period, we’ll see.
Ötzi Ötztaler9 Oct 2020 15:51
Currently, I mostly have a cycle of 8 to 12 hours at night, while the pump is completely off during the day. I’ll experiment a bit once the hydraulic balancing is perfect. You should be able to script the Luxtronic for these kinds of adjustments.
D
Daniel-Sp9 Oct 2020 16:32Ötzi Ötztaler schrieb:
I currently mostly have an 8 to 12-hour cycle at night, with the pump completely off during the day. I’ll experiment a bit once the hydraulic balancing is perfect. You should be able to script the Luxtronic for such tweaks. You don’t need scripts for that. Simply use a positive “night setback” and set the switching time not at night, but during midday instead. Then the Luxtronic increases the return temperature setpoint by the configured number of degrees Celsius at midday. Additionally, you have to lower the base point of the heating curve to keep the produced heat amount constant over 24 hours. It’s very simple, without scripts…