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.
chewbacca123 schrieb:
Being economical is good, but not at the expense of quality of life. If we’re too cold, or if we spend the whole day wondering whether it’s too cold, we just turn on the heating.
Have you ever considered a photovoltaic system with a battery storage? Despite bad weather, it currently covers almost our entire daily electricity needs. I never said we are freezing right now. I only meant that the heating season shouldn’t be started too early, or should be started as late as possible. No one here is stingy (not even as a hobby ), otherwise there wouldn’t be a fireplace, thermal storage, and photovoltaic system. Last year, the additional payment (still without storage) was still surprising because we were too careless with the house’s consumption in an area of 140 m² (1,507 sq ft) plus 70 m² (753 sq ft) basement. We came from a 108 m² (1,163 sq ft) ground floor apartment, so it’s no surprise that electricity consumption (mostly just comfort electricity) was significantly lower there.
Ötzi Ötztaler3 Oct 2020 09:28
Zaba12 schrieb:
I’m cured of turning on the heating so early in the year now.It’s actually pointless, especially now with the high outdoor temperatures, a well-configured heat pump runs with coefficients of performance above 6. Have you considered the usual tips: disabling ERRs, lowering the heating curve, closing the bypass valve, and so on?
My approach: optimize the heat pump for maximum efficiency. Then I enjoy comfortable warmth at a low cost in the well-insulated house. If it doesn’t save at least 15 euros per month, I’d rather heat only halfway...
Yes, that’s true. We also have significantly higher consumption compared to our first house. A second freezer, a small night light in the hallway for the children, a CD player here and there, and so on. It all adds up. The children also shower and bathe more often. We will notice this with the water and gas bills as well.
chewbacca1233 Oct 2020 09:43Zaba12 schrieb:
I never said we are currently freezing. I just wrote that the heating period shouldn’t be started too early, or rather as late as possible. No one here is being stingy (not even as a hobby), otherwise there wouldn’t be a fireplace, battery storage, and solar panels. The extra bill last year (still without the battery) was surprising, though, because the household consumption for 140m² (1500 sq ft) plus 70m² (750 sq ft) basement was treated too carelessly. We came from a 108m² (1160 sq ft) ground floor apartment, so it’s not surprising that the electricity consumption was significantly lower there, as it was just for comfort use. I also think, like others are saying, that your heating system is not well adjusted. There’s definitely room for optimization; ideally, it should run almost independently and you wouldn’t need to adjust it at all.
I’ve been working on optimizing ours since last winter, doing a little more each time. It’s getting better and better.
The heating is definitely not optimized. Basically, 10 kWh (35.8 kBtu) of the 35 kWh (119.4 kBtu) per day from last winter goes to the car, and the rest is for heating, hot water, and other household electricity.
So, I will take a look at what charging the car at work brings, the battery storage will be out anyway, and then I will decide whether to take action after the heating season.
It is not representative due to being 2/3 daylight saving time since April, but this is our household consumption exactly day by day for the last 5 months. The nearly 6.1 MWh (20.8 million Btu) is the photovoltaic production since the beginning of May.
So, I will take a look at what charging the car at work brings, the battery storage will be out anyway, and then I will decide whether to take action after the heating season.
It is not representative due to being 2/3 daylight saving time since April, but this is our household consumption exactly day by day for the last 5 months. The nearly 6.1 MWh (20.8 million Btu) is the photovoltaic production since the beginning of May.
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