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 16:02Daniel-Sp schrieb:
It’s nice and warm now, so lower the heating curve!
Important: what are the current room temperatures and flow rates?
You need these to balance the heating circuits with each other.
Please set them and then we can continue. What is the heating curve set to at the moment? Total flow rate?
Be patient. We don’t know your underfloor heating system yet due to missing documentation. But it will work out. Here are the data from 3 PM (at 7 AM I lowered the radiators to 29-22-0)
chewbacca12316 Dec 2019 17:35Musketier schrieb:
What I noticed is that I don’t think you’ll achieve a 4° temperature difference between the hallway and the living room/kitchen. It might depend on the floor plan and habits, but the air exchange between the rooms is probably too high. But it’s only 2.5 degrees between the hallway and living area, so maybe that’s doable. Around 19.5°C (67°F) in the hallway and 22.0°C (72°F) in the living area would be ideal.
D
Daniel-Sp16 Dec 2019 17:38Ok,
Reduce the hallway wardrobe to 1
Hallway downstairs to 0.8
Parents’ bedroom to 0.8 and 1
The main bathroom will be a problem as expected. It should get a bit more flow once the other heating circuits are reduced, let’s see. I’ll report back this evening.
What outdoor temperature do you have right now?
Reduce the hallway wardrobe to 1
Hallway downstairs to 0.8
Parents’ bedroom to 0.8 and 1
The main bathroom will be a problem as expected. It should get a bit more flow once the other heating circuits are reduced, let’s see. I’ll report back this evening.
What outdoor temperature do you have right now?
D
Daniel-Sp16 Dec 2019 17:53Musketier schrieb:
I have 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. This means that on average you have a lower temperature. As a result, you probably won’t reach a comfortable room temperature and will have to raise the temperature curve. Then the other rooms get too warm again, and you reduce the flow there. The consequence: different return temperatures again.
Do you have a temperature sensor on every return line? Otherwise, the water in the heating circuit would mix anyway.
In my case, the rooms that need to be warmest (bathrooms and living room) are fully opened.
This probably also depends on the heating system. In my system, the return temperature doesn’t matter at all. My heating is only controlled by the supply temperature. It is a small bathroom with a desired temperature below 20°C (68°F). Is there even a shower in the 4 m² (43 sq ft)? If so, it is probably not used.
Even if the mixed return temperature should not be raised significantly, the small heating circuit, due to low resistance, takes flow from the other heating circuits. At least my first suggestion for this heating circuit was not that bad.
D
Daniel-Sp16 Dec 2019 17:55chewbacca123 schrieb:
Please take a quick look at the attached picture. How much volume is that? 2?
It's hard to tell from the photo since it's taken at an angle, but it looks more like over 2.5. My floats look a bit different; I would use the red "plate" as a reference...Similar topics