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.
B
boxandroof22 Jan 2020 11:53Yes, the electricity meters built into the devices are often very inaccurate, in my heat pump they are completely unreliable.
If you don’t have a separate meter for electricity consumption, you can statistically compare the data in the heat pump with the electricity consumption recorded by the utility meter. Large discrepancies will become apparent: "Household electricity = total electricity consumption – electricity consumption of the heat pump." If on cold days the household electricity usage is consistently higher or lower than on warm days, meaning it correlates with the supposed electricity consumption of the heating system, then something is wrong.
If you don’t have a separate meter for electricity consumption, you can statistically compare the data in the heat pump with the electricity consumption recorded by the utility meter. Large discrepancies will become apparent: "Household electricity = total electricity consumption – electricity consumption of the heat pump." If on cold days the household electricity usage is consistently higher or lower than on warm days, meaning it correlates with the supposed electricity consumption of the heating system, then something is wrong.
Our HomeManager logged data during the recent cold days:
January 19: Total 26 kWh – of which 13.9 kWh were used by our heat pump
January 20: Total 27 kWh – of which 14.4 kWh were used by our heat pump
January 21: Total 23 kWh – of which 13.4 kWh were used by our heat pump
Inside the house, the temperature ranges from about 22-24 °C (72-75 °F) in all rooms from the basement to the upper floor.
Domestic hot water set to 44 °C (111 °F) with a 3 °C (5 °F) hysteresis.
We still have snow here. The outdoor temperature is still below 0 °C (32 °F). Altitude is 940 m (3,084 ft) above sea level. House size approximately 180 m² (1,938 sq ft) plus basement.
January 19: Total 26 kWh – of which 13.9 kWh were used by our heat pump
January 20: Total 27 kWh – of which 14.4 kWh were used by our heat pump
January 21: Total 23 kWh – of which 13.4 kWh were used by our heat pump
Inside the house, the temperature ranges from about 22-24 °C (72-75 °F) in all rooms from the basement to the upper floor.
Domestic hot water set to 44 °C (111 °F) with a 3 °C (5 °F) hysteresis.
We still have snow here. The outdoor temperature is still below 0 °C (32 °F). Altitude is 940 m (3,084 ft) above sea level. House size approximately 180 m² (1,938 sq ft) plus basement.
Altai schrieb:
That interests me as well; I also monitor my consumption, and it doesn’t seem very low to me. I’d like to join in here. I’m interested too. Over 24 hours, depending on the outside weather and whether the fireplace is on or not, we use between 1.5 and 3.5 cubic meters.
Heated area is 125 sqm (1350 sq ft), consistently kept between 22.5 and 23 degrees Celsius (72.5 and 73.5°F) everywhere except the bedroom.
Domestic hot water is set to 50 degrees Celsius (122°F).
P
pffreestyler22 Jan 2020 14:04Just to be sure, for someone like me who’s not very knowledgeable: do I calculate the amount of heat from gas by multiplying consumption by the calorific value?
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