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.
chewbacca12319 Dec 2019 21:26Daniel-Sp schrieb:
Could it be that the heating was off at the time of reading?
What matters is the flow and return temperature just before the end of a heating cycle.
How long does the pump run per heating cycle now? Where can I see how long, on average, the pump runs per cycle?
D
Daniel-Sp19 Dec 2019 21:29Download the data log via USB and view the graph in Opendta (google it).
Usually the VD1 curve.
Usually the VD1 curve.
chewbacca12320 Dec 2019 09:53Okay, here are the data from this morning. The heat pump was just finishing its cycle, so I was only able to read the basement values. When I went upstairs, it had already stopped. The flow volume is now only 1059 per hour in total—is that too low for LAD9? The temperatures now seem to be fine. However, I adjusted the heating curve again late yesterday evening to: 29-22-0. Because, for some reason, the living area and the large bathroom were only at 20.6°C (69°F).
D
Daniel-Sp20 Dec 2019 11:14The temperature difference of almost 10K in the bedroom is good, and the temperature has already dropped by 1.5K.
The high temperatures in the hallway are surprising despite a large temperature difference and low flow rate. Maybe the screed still needs one or two days to adjust. I would wait until tomorrow for now. I remain concerned about the main bathroom, which seems to be undersupplied by the underfloor heating. You might need to supplement heating there if necessary.
Have you downloaded "Opendta" yet?
What is your house’s heating load, just for heating without hot water?
The high temperatures in the hallway are surprising despite a large temperature difference and low flow rate. Maybe the screed still needs one or two days to adjust. I would wait until tomorrow for now. I remain concerned about the main bathroom, which seems to be undersupplied by the underfloor heating. You might need to supplement heating there if necessary.
Have you downloaded "Opendta" yet?
What is your house’s heating load, just for heating without hot water?
chewbacca12320 Dec 2019 12:52Daniel-Sp schrieb:
The spread of almost 10K (about 18°F) in the bedroom is good, and the temperature has already dropped by 1.5K (about 2.7°F).
The high temperatures in the hallway are surprising despite the large spread and low flow. Maybe the screed still needs one or two days to adjust its temperature. I would wait until tomorrow for now. I remain concerned about the main bathroom; it appears to be undersupplied by the underfloor heating. You might need to use additional heating there if necessary.
Have you downloaded "Opendta" yet?
What is the heating load of your house, heating only without domestic hot water? I was also surprised about the hallway, but yes, I will wait and see over the next 24 hours.
Where can I find out the heating load of our house?
I am downloading opendta now.
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