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.

Neues zweistöckiges Haus auf Baustelle mit weißer Blockfassade, pinker Dämmung und großen Fenstern
J
Joedreck
8 Jan 2021 14:41
Way, way, way too much!
You urgently need to adjust the basic settings!
D
Daniel-Sp
8 Jan 2021 15:22
Then please send an up-to-date DTA and CSV. Have you changed anything? It was running quite well last winter.
D
Daniel-Sp
8 Jan 2021 15:24
Ah, received it already. I’ll take a look this evening.
tomtom798 Jan 2021 15:28
On Off heat pump with hot water about 12 times in 48 hours


Data logger diagram with temperature curves: supply red, return blue, actual hot water purple, room thermostat brown.


Current average operating time about 2-3 hours
chewbacca1238 Jan 2021 17:13
The problem is, we have the hot water set continuously from 6 a.m. to 7 p.m. My husband prefers it this way because, as a teacher, he sometimes gets home early and wants to shower with warm water.

How do you manage your hot water? You always need it at different times, and if you shower and the water isn’t warm, it’s really annoying.
tomtom798 Jan 2021 17:30
Set up a circulation system so you always have warm water. Domestic hot water temperature at 48°C (118°F) with a 6 K hysteresis.