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.
D
Daniel-Sp30 Dec 2019 11:48Good system performance even with a reduced heating circuit hysteresis of 1.5K. Only 3 heating cycles.
Try reducing the heating circuit hysteresis further to 1.0K.
I would reduce the hallway temperature by half. Set the living area to full heat. Use the room as the reference room and then adjust the heating curve accordingly. I’m afraid the bathroom has too little heating surface to reach 22°C (72°F) with floor heating alone, so you’ll need supplementary heating with the towel radiator when necessary.
The pump optimization will only become active at a temperature difference (ΔT) greater than 1°C (1.8°F), so you can’t see any effects yet.
Does your heat pump have a heat meter?
Try reducing the heating circuit hysteresis further to 1.0K.
I would reduce the hallway temperature by half. Set the living area to full heat. Use the room as the reference room and then adjust the heating curve accordingly. I’m afraid the bathroom has too little heating surface to reach 22°C (72°F) with floor heating alone, so you’ll need supplementary heating with the towel radiator when necessary.
The pump optimization will only become active at a temperature difference (ΔT) greater than 1°C (1.8°F), so you can’t see any effects yet.
Does your heat pump have a heat meter?
guckuck2 schrieb:
The bathroom will then have reached the limit of what’s possible. There is too little heated surface area. You can only increase the supply temperature and reduce the flow to the other rooms again to avoid overheating there. Of course, this increases energy consumption.
@ivenh0
If applicable, close the existing bypass valve, fully open the ERR, or remove the actuators, and turn up the Taco setters. If there is still insufficient flow in the system, increase the circulation pump speed. Everything has already been done except increasing the circulation pump speed. How can I turn it up?
D
Daniel-Sp30 Dec 2019 12:50ivenh0 schrieb:
Everything is done except the circulation pump. How can I increase its speed? What kind of system do you have? Maybe start a separate thread...
chewbacca12330 Dec 2019 13:02Daniel-Sp schrieb:
Good cycling behavior even with a reduced heating circuit hysteresis of 1.5K (2.7°F). Only 3 heating cycles.
Please try further reducing the heating circuit hysteresis to 1.0K (1.8°F).
I would halve the hallway zone again. Fully open the living area. Use the room as the leading room and then adjust the heating curve accordingly. I’m afraid the bathroom has too little heating surface to reach 22°C (72°F) with just the underfloor heating, so supplement with the towel radiator if needed.
Pump optimization only activates at a temperature difference (delta T) above 1°C (1.8°F), so no effect can be seen yet.
Does your heat pump have a heat meter?
[ATTACH alt="29-30-December.jpg"]41317[/ATTACH] I will definitely halve the hallway again now; the living area is already fully open.
Hopefully, when I get the documentation next year, I will know how many meters of pipe are installed where. They say the bathroom has the most, but it’s strange that not enough heat is reaching it. :-/
H
hausbauer30 Dec 2019 14:01Perhaps using an infrared heater or an electric towel warmer in the bathroom as an additional heat source might be worth considering. If you reduce heating elsewhere now, all other rooms except the bathroom will be heated less efficiently than possible. In the bathroom, you could use a timer to increase the temperature by about two degrees if needed.
chewbacca12330 Dec 2019 14:15Hausbauer schrieb:
Maybe consider an infrared heater or an electric towel warmer in the bathroom as additional heating. If you reduce the heating elsewhere, all rooms except the bathroom will be less efficiently heated than possible. And in the bathroom, you could use a timer to raise the temperature by a couple of degrees if needed. I have an electric towel warmer in the bathroom, but I don’t really want to use it to heat the bathroom since it consumes electricity. The underfloor heating is supposed to handle that. I’m still giving it my all and trying to optimize wherever I can. But as a last resort, the towel warmer will do. What really bothers me, though, is that we’ve been using 30 kWh per day for four days, and yesterday to today even 35. And the sun has been shining strongly. I just don’t understand this. We barely have heating cycles anymore, and we no longer run hot water 24 hours a day.
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