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.
Hans-Maulwurf schrieb:
The house is a new build, 170 sqm (1,830 sq ft) with underfloor heating.For a standard energy-saving regulation building with a buffer, this should be normal. Ours is return flow controlled, so it’s not directly comparable. I believe at 12°C (54°F) the return flow is 22°C (72°F) (supply 25–27°C (77–81°F)), and at -12°C (10°F) the return flow is 25 or 26°C (77–79°F) (so about 30°C (86°F) supply).S
Schambeck23 Jan 2020 11:06blackm88 schrieb:
No, a Tecalor THZ504 air-to-water heat pump (integrated unit with controlled ventilation and heat recovery)Are you familiar with a Tecalor THD 400 AL?D
Daniel-Sp23 Jan 2020 11:15halmi schrieb:
I correct myself: the data should be included in the documents/calculations from your energy consultant. It is advisable to carry out a room-by-room heating load calculation and design the underfloor heating based on the appropriate supply and return temperatures. After that, the heat pump is selected. Unfortunately, this is rarely done. Usually, a heating load per square meter for the whole house is assumed and applied to all rooms, regardless of how many exterior walls each room has. When the underfloor heating is then designed based on this, it doesn’t match properly in some rooms (usually bathrooms). The heat pump is then chosen based on guesswork and is often hopelessly oversized.
In the documents from our energy consultant, there was no room-by-room heating load calculation. The company contracted by the heating installer also did not perform a room-by-room heating load calculation but simply assumed a general heating demand per square meter. So it meant doing it yourself or hiring an external service.
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Hans-Maulwurf23 Jan 2020 11:44Daniel-Sp schrieb:
It is sensible to carry out a heating load calculation for each room individually It appears that this was not done.
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