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.
Since I don’t have a mechanical ventilation system with heat recovery installed, just a quick question. The supply air is in the bedroom and the exhaust air is in the bathroom, right? And are they connected the correct way around? I just want to make sure that fresh air isn’t entering the bathroom, then being warmed up in the hallway before being transferred into the bedroom.
I think we had a reversed mechanical ventilation system with heat recovery here a few years ago.
I think we had a reversed mechanical ventilation system with heat recovery here a few years ago.
chewbacca12319 Dec 2019 12:32Musketier schrieb:
Since I don't have a mechanical ventilation system in my home, just a quick question. The supply air is in the bedroom and the exhaust air is in the bathroom, right? And are they connected the right way around?
I just want to make sure that fresh air isn't coming into the bathroom, then being heated in the hallway, and finally flowing into the bedroom?
I think we already had a mechanical ventilation system installed incorrectly a few years ago here. I’m pretty sure it’s definitely connected the right way because I can feel the fresh air; the vent is located right above our bed. But the technician is coming later, so I will ask him about everything again.
chewbacca12319 Dec 2019 12:33Daniel-Sp schrieb:
Lower hallway and bedroom by 0.4 meters (1 foot 4.9 inches) each, small bathroom set to 2. I’m headed to Denmark now, will check back in this evening. Please also provide supply and return temperatures for the small bathroom. The pump is currently stopped again, I’ve been out until now. As soon as the pump is running and I catch it, I’ll measure directly.
chewbacca12319 Dec 2019 12:52Daniel-Sp schrieb:
The room temperatures are still good.
You can reduce the flow rate to 0.75. Tomorrow, while heating, measure the return temperature. Then adjust the return flow to the dressing room accordingly. Both heating circuits should have roughly the same return temperature.
Please also measure the supply and return temperatures of the small bathroom, then check the current supply and return temperatures in the heat pump controller and set both values here.
The return temperature in the living area should also be approximately the same.
If you have bought the recommended thermometer, you can place it directly on the pipe and take three measurements for cross-checking.
The base temperature of 21°C (70°F) might be too low, we will see.
Show the heating technician the flow meter tube that cannot be read; it should ideally be replaced... Attached are the supply and return temperatures.
D
Daniel-Sp19 Dec 2019 17:11Could it be that the heating was off at the time of reading?
Of interest are the flow and return temperatures shortly before the end of a heating cycle.
How long does the pump run per heating cycle now?
Of interest are the flow and return temperatures shortly before the end of a heating cycle.
How long does the pump run per heating cycle now?
chewbacca12319 Dec 2019 19:27Daniel-Sp schrieb:
Could it be that the heating was off at the time of the reading?
Of interest are the supply and return temperatures just before the end of a heating cycle.
How long is the pump running per heating cycle now? Yes, that could be the case that I was too slow.
The cycling is much better now, but the average is still poor since it is taken from the overall period and not a snapshot.
I’m monitoring it, and the heat pump is now off for about 4-5 hours, standing idle.
The technician was here, provided me with the pipe length, and adjusted everything again. I will report back tomorrow.
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