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.
The feeling of being "left alone" is unfortunately true. However, this is mainly because the heating contractor usually has no access to the energy consultant’s documents during the quotation and installation phase—99% of the time—since the energy certificate is prepared much later, or the heat pump is operated without a buffer tank, as was the case for me. Nobody dares to omit the ERRs (energy reference values), so one issue leads to another. The thermal balancing, including setting the comfort temperature, can realistically only be done by the homeowner.
Basically, everything can be corrected except for an oversized heat pump and heating circuits that are too few or incorrectly installed.
Basically, everything can be corrected except for an oversized heat pump and heating circuits that are too few or incorrectly installed.
tomtom79 schrieb:
It’s crazy how heat pumps are being marketed as a cure-all for CO2 reduction, but users are left alone with the settings and the high energy consumption remains the same. No problem, though—after 10 years they can just buy a new one or pay a lot to replace the compressor.This really frustrates me too. People are forced to build highly insulated houses but still end up consuming a huge amount of electricity from coal. Our politicians are currently showing disastrous mismanagement across the board—I’m just thinking of the pandemic...
chewbacca12311 Jan 2021 07:06tomtom79 schrieb:
It’s crazy that people are sold a heat pump as a cure-all for CO2 emissions, but then they’re left on their own with the settings and the high energy consumption. But no problem, after 10 years they can just buy a new one—or pay a lot to replace the compressor. That’s exactly right. I was also shocked at how little our heating engineer informed us. Without this forum, we would be completely lost.
chewbacca12311 Jan 2021 07:34A brief update on the behavior of my heat pump: after readjusting the settings with help from Daniel-SP, I was able to reduce the compressor starts by half, from 40 to 20 within 48 hours, about 10 per day.
This is quite satisfactory, especially since the weather is much colder now than a few days ago. Last night it was -7°C (19°F). The pump now runs for much longer periods at a time. Great!
My heating curve is set to 29-22-0 and keeps the rooms comfortably warm; we even managed to reach 21°C (70°F) in the bathroom. We have to be content with that.
This is quite satisfactory, especially since the weather is much colder now than a few days ago. Last night it was -7°C (19°F). The pump now runs for much longer periods at a time. Great!
My heating curve is set to 29-22-0 and keeps the rooms comfortably warm; we even managed to reach 21°C (70°F) in the bathroom. We have to be content with that.
A
Alessandro11 Jan 2021 08:18I managed to control the short cycling by reducing the compressor output. I have about 3-6 cycles per day. I am working with a 100L (26 gallon) buffer tank and ERR :p 😱 What I can’t really understand is the daily consumption. At an outdoor temperature of -4°C (25°F) and a heat pump output of 4.8-5.2 kW for a 200 m² (2,150 ft²) house, it’s around 25-30 kWh. Is that normal?
So, our situation is escalating completely right now. At minus 8°C (17.6°F), we need 38 kWh of electricity daily. The system has automatically lowered the hot water temperature from 48°C to 44°C (118.4°F to 111.2°F). It can’t manage any more with the ambient temperature.
Sometimes I really long for the gas heating back, especially in winter 🙁
Sometimes I really long for the gas heating back, especially in winter 🙁
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