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.
tomtom79 schrieb:
Turn off the circulation, then you always have hot water. Hot water set to 48 degrees with a 6 K hysteresis.Well no, then you heat up to 54 degrees, which is not very efficient. It simply depends on demand (time, amount) and how large the storage tank is.
chewbacca1238 Jan 2021 18:07tomtom79 schrieb:
Turn off the circulation, then you will always have warm water. Hot water set to 48°C (118°F) with a 6 K hysteresis. But then you have to run the water for about a minute before it gets warm, right? Our experience. Actually, that is a total waste of water.
chewbacca1238 Jan 2021 18:09guckuck2 schrieb:
Phew no, then you heat up to 54°C (129°F). That’s not very efficient.
It simply depends on demand (time of day, amount) and how big the storage tank is.We have a 180-liter (47.5-gallon) tank, hot water from 6 a.m. to 7 p.m. Circulation permanently on
tomtom79 schrieb:
No, you are mistaken.Correct.
Setting the target temperature to 48 degrees Celsius (118°F) with a hysteresis of 6 K results in heating starting at 45 degrees Celsius (113°F) and stopping at 51 degrees Celsius (124°F).
That should work properly.
Really?
I thought heating would continue up to 48°C (118°F) and only start again when it drops below 42°C (108°F). That’s how I understood it so far.
How quickly the water heats up without circulation depends on the length of the pipe from the buffer tank to the point of use.
All my hot water outlets are located very close to the utility room. None should be more than 4 meters (13 feet) away. That should take only about 10 seconds, I think... Of course, it could be different for you.
I thought heating would continue up to 48°C (118°F) and only start again when it drops below 42°C (108°F). That’s how I understood it so far.
How quickly the water heats up without circulation depends on the length of the pipe from the buffer tank to the point of use.
All my hot water outlets are located very close to the utility room. None should be more than 4 meters (13 feet) away. That should take only about 10 seconds, I think... Of course, it could be different for you.
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