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.
Daniel-Sp schrieb:
That's surprising, which model do you have? Currently, with still mild temperatures, you should easily get over 4 in heating mode. LAV 12HV with 9 kW (12 hp). Modulating, I think it might be oversized? But it was sized according to the heating load calculation.
Ötzi Ötztaler3 Oct 2020 14:20
Bookstar schrieb:
LAV 12HV with 9 kW.Well, you ended up with the inefficient pump that has a great cooling feature but uses outdated refrigerant, instead of the efficient and modern LADV without cooling.M
mambo19883 Oct 2020 14:56Ötzi Ötztaler schrieb:
Well, you got talked into the inefficient pump with a great cooling function but outdated refrigerant, instead of the efficient and modern LADV without cooling We were offered the Novelan LAV 8. The cooling function is important to us. Is there a better model with a cooling function and BAFA funding?Ötzi Ötztaler schrieb:
Well, you ended up with the inefficient pump that has great cooling but uses an outdated refrigerant, instead of the efficient and modern LADV without cooling. Yes, but the reason was that the LADV had significant technical issues at the time and was even briefly unavailable from the manufacturer. According to the performance data, it would have a COP about 0.7 higher. That’s pretty good, but not earth-shattering, right? According to my calculations, about 12% more efficient...
I have one more possible explanation when I look at the consumption over the past 7 days:
Heat energy for domestic hot water: 35 kWh
Heat energy for heating: 61 kWh
Electricity consumption was 31 kWh. By my calculations, the COP comes to 3.2. However, a lot of hot water is involved here, which might lower the COP since the heat pump has to heat up to 50°C (122°F), right?
Heat energy for domestic hot water: 35 kWh
Heat energy for heating: 61 kWh
Electricity consumption was 31 kWh. By my calculations, the COP comes to 3.2. However, a lot of hot water is involved here, which might lower the COP since the heat pump has to heat up to 50°C (122°F), right?
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