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
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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.
chewbacca12316 Dec 2019 11:03Daniel-Sp schrieb:
Then the temperature difference between the supply and return flow becomes too small, and the heat pump does not operate as efficiently. What do you think about the hallway being so extremely warm now, over 23°C (73°F)? Something must be set completely wrong, right? Regarding the flow rate settings.
It was almost like a sauna, really uncomfortably hot.
chewbacca12316 Dec 2019 11:05Musketier schrieb:
I need to step in here. Isn’t it actually the other way around? With the small area, where the shower is probably excluded, you have to heat the entire room. Now you’re also reducing the flow rate. That means the average temperature will be lower. As a result, you probably won’t reach a comfortable room temperature and will have to raise the temperature curve. This causes the other rooms to become too warm again, so you turn their flow rate down. The result: different return water temperatures again.
Do you have a temperature sensor on every return line? Otherwise, the water in the heating circuit valve (HKV) will mix anyway.
In my case, the rooms that should be warmest (bathrooms and living room) are fully open.
It probably also depends on the heating system. For my heating, the return temperature doesn’t play a role at all. My system is controlled only by the supply temperature. The shower is excluded, correct
D
Daniel-Sp16 Dec 2019 12:37That feels nicely warm, so lower the heating curve!
Important: what are the current temperatures in the other rooms and the flow rates?
You need these now to balance the heating circuits with each other.
Please adjust them, and then we can continue. What is the current heating curve setting? Total flow rate?
Be patient. We don’t yet know your underfloor heating well due to missing documentation. But it will work out.
Important: what are the current temperatures in the other rooms and the flow rates?
You need these now to balance the heating circuits with each other.
Please adjust them, and then we can continue. What is the current heating curve setting? Total flow rate?
Be patient. We don’t yet know your underfloor heating well due to missing documentation. But it will work out.
D
Daniel-Sp16 Dec 2019 12:56Do you now have significantly more flow in the hallway than in the large bathroom? If so, you can reduce the flow in the hallway, but not completely to zero. Before the changes made yesterday, was the heating circuit in the large bathroom fully open?
chewbacca12316 Dec 2019 14:28Daniel-Sp schrieb:
Do you now have significantly more flow in the hallway than in the large bathroom? If so, you can reduce the flow in the hallway, but not to zero. Before yesterday’s changes, was the heating circuit in the large bathroom fully open?I posted a picture showing the temperatures from this morning in all the rooms, did you see that? You can definitely take some volume flow away from the hallway, for sure. Likewise, you can reduce it in the bedroom as well. I’ll take another look at the valves once the baby is asleep and let you know their current settings.chewbacca12316 Dec 2019 15:16Daniel-Sp schrieb:
It's quite warm, so lower the heating curve!
Important: what are the current room temperatures and flow rates?
You need these now to balance the heating circuits with each other.
Please set them and then we can continue. What is the heating curve currently set to? Total flow rate?
Be patient. We don’t know your underfloor heating system yet due to missing documentation. But it will work out. Please take a quick look at the attached picture, how much volume is that?
2?
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