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
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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.
chewbacca12329 Dec 2019 10:49tomtom79 schrieb:
I would also like to take a look at the csv.Hey, here are today’s data. The compressor barely switches on anymore, great. But unfortunately, the bathroom is still too cold. Today, with outdoor temperature at -4°C (25°F), it’s only 20.7°C (69°F) in the bathroom. The overheating protection is almost triggered at 5.5 out of 6. :D
Daniel-Sp29 Dec 2019 10:55Please close the bypass valve, thanks.
I have to join the discussion here as well. After this thread sparked my curiosity, I checked the power consumption of our heat pump. I was more than shocked. It amounts to roughly 560€ for 1.5 months.
So, I adjusted the temperature settings to 31/21/0 and switched all electronic thermostats to manual mode, fully open. The consumption and cycling have already decreased significantly. The temperatures are quite good as well.
What puzzles me, however, is that only a few valves show a flow rate around 2 liters (0.5 gallons), while the rest are closer to 1 liter (0.26 gallons), and unfortunately, the last valves on the underfloor heating manifold are almost at zero. One affected room is the bathroom on the upper floor. The tiles there are ice cold. How can I increase the flow here?
So, I adjusted the temperature settings to 31/21/0 and switched all electronic thermostats to manual mode, fully open. The consumption and cycling have already decreased significantly. The temperatures are quite good as well.
What puzzles me, however, is that only a few valves show a flow rate around 2 liters (0.5 gallons), while the rest are closer to 1 liter (0.26 gallons), and unfortunately, the last valves on the underfloor heating manifold are almost at zero. One affected room is the bathroom on the upper floor. The tiles there are ice cold. How can I increase the flow here?
chewbacca12330 Dec 2019 11:23ivenh0 schrieb:
I have to join in here as well. After this thread piqued my curiosity, I checked the electricity consumption of our heat pump. I was more than shocked. It amounts to €560 for 1.5 months.
So, I adjusted the temperature settings to 31/21/0 and set all electronic thermostats to manual and fully open. The consumption and cycling decreased significantly. The temperatures are also quite good.
What puzzles me, though, is that only a few valves show a flow rate around 2L, while the rest are closer to 1L, and unfortunately, the last valves on the underfloor heating manifold are almost at zero. One of the affected rooms is the bathroom on the upper floor. The tiles there are ice cold. How can I increase the flow here? That’s really intense. After all the modifications, I now have excellent cycling of the heat pump, thanks to the great help here. Before, I had 200 impulses per day, now maybe five. Still, I used 35 kWh within 24 hours, even though the sun was shining heavily for 9 hours. My bathroom is our trouble spot at 20.9°C (69.6°F); I even managed to get 3 l/min flow there, but it still doesn’t get warmer. I can’t believe it.
Try increasing the flow rate for the rooms that feel too cold on your system. Maybe this small adjustment will solve the problem. In my bathroom, I can’t increase it any further; 3 l is the max. It just doesn’t get warmer. Our heating curve is set to 27.5-22-0. All other rooms are fine! Actually, our hallway is quite warm at 23°C (73.4°F) — there, I have set the flow to 0.5 l.
The bathroom will then reach the limit of what is possible. There is too little heated surface area. You can only increase the flow temperature and reduce the flow to other rooms again to avoid overheating there. Of course, this increases energy consumption.
@ivenh0
If applicable, close any existing bypass valve, fully open the ERR, or remove actuators, and open the Taco setters. If there is still insufficient flow in the system, increase the circulation pump speed.
@ivenh0
If applicable, close any existing bypass valve, fully open the ERR, or remove actuators, and open the Taco setters. If there is still insufficient flow in the system, increase the circulation pump speed.
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