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

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.

Neues zweistöckiges Haus auf Baustelle mit weißer Blockfassade, pinker Dämmung und großen Fenstern

guckuck224 Jan 2020 13:09

#463

Bookstar schrieb:

Then you probably installed significantly more piping; we stuck to about 10cm (5 inches). That likely results in a higher flow temperature, otherwise the house gets too cold.

The alternative would be to increase the flow rate. Ten centimeters (5 inches) is not too bad when you consider that some heating contractors still install 15 or even 20cm (6 or 8 inches).

If necessary, you could also make some adjustments by reducing the hysteresis. This leads to less fluctuation in the flow temperature but causes the heat pump to cycle more frequently. So, more cycles but a more stable flow temperature. In return, you would then lower the end point of the heating curve.

Lumpi_LE24 Jan 2020 13:36

#464

Just as important as the spacing, if not more so, is the diameter. With a spacing of 10 and 14mm (0.55 inches) tubes, you haven’t achieved much.

Bookstar24 Jan 2020 13:52

#465

guckuck2 schrieb:

The alternative would be to increase the flow rate. 10cm (4 inches) isn’t too bad considering some heating contractors still install 15cm (6 inches) or even 20cm (8 inches).

Potentially, you could also improve things by reducing the hysteresis. That would result in less fluctuation in the supply temperature, but the heat pump would run more often. So, a few more cycles, but a more stable supply temperature. At the same time, you would lower the endpoint of the heating curve.

Yes, there’s probably still room for improvement, but I’m not in the mood right now. Everything runs smoothly; maybe I’ll tackle it again next winter.

The pipes were 18mm (3/4 inch), I checked...

boxandroof24 Jan 2020 16:03

#466

Bookstar schrieb:

Then you probably installed significantly more piping; we stuck to about 10cm (4 inches). That likely results in a higher flow temperature, otherwise the house gets too cold.

The type of floor covering also has a considerable impact.

chewbacca12319 Mar 2020 14:36

#467

Hello everyone,
I hope you are all healthy despite these difficult times.

I have something strange today:
The compressor has been heating up for over 7 hours.
Can someone take a look at this? What could it be?

Best regards

Display shows compressor heating, temperature 41.9°C (107.4°F) to 43.4°C (110.1°F), link to standard menu.

tomtom7919 Mar 2020 16:55

#468

Restart, it might have just frozen.

ᐅ Underfloor heating with an air-to-water heat pump. House gets too warm when the sun is shining.

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