ᐅ Setting up a mechanical ventilation system with heat recovery for an energy-efficient home (KfW 70 standard) combined with underfloor heating
Created on: 30 Nov 2014 12:03
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PhoenixDH
Hello everyone,
after living in our new house for a few days now, I’m wondering if our heating system is set up optimally.
It consists of a gas boiler with a 100-liter (26-gallon) hot water tank and a mechanical ventilation system with heat recovery.
The entire ground floor has underfloor heating, while upstairs only the bathroom does.
The other rooms are equipped with panel radiators.
My friends and I both work and leave the house early, around 7:00 a.m., returning only around 6:00 p.m.
Currently, we have the system programmed so that the heating/ventilation system/pump/hot water start about one hour before we’re home and turn off when we leave, or at 10:00 p.m. in the evening, except on weekends.
Does it make sense to set the system up this way?
Considering that underfloor heating is quite slow to react.
The question is, what is more efficient: generating energy only when needed, taking into account that the system cools down in between, or maintaining a constant temperature and using just one time window per day.
Some practical experience would be helpful, thanks!
after living in our new house for a few days now, I’m wondering if our heating system is set up optimally.
It consists of a gas boiler with a 100-liter (26-gallon) hot water tank and a mechanical ventilation system with heat recovery.
The entire ground floor has underfloor heating, while upstairs only the bathroom does.
The other rooms are equipped with panel radiators.
My friends and I both work and leave the house early, around 7:00 a.m., returning only around 6:00 p.m.
Currently, we have the system programmed so that the heating/ventilation system/pump/hot water start about one hour before we’re home and turn off when we leave, or at 10:00 p.m. in the evening, except on weekends.
Does it make sense to set the system up this way?
Considering that underfloor heating is quite slow to react.
The question is, what is more efficient: generating energy only when needed, taking into account that the system cools down in between, or maintaining a constant temperature and using just one time window per day.
Some practical experience would be helpful, thanks!
PhoenixDH schrieb:
You also have to consider that the house was built in August.Exactly, that’s why it’s important to dry heat properly—just don’t be stingy.
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PhoenixDH29 Dec 2014 20:17No, it should definitely be warm...
But what’s not necessary doesn’t have to be.
No need to waste hammer blows either, unfortunately.
But what’s not necessary doesn’t have to be.
No need to waste hammer blows either, unfortunately.
In general, where underfloor heating is installed, a traditional nighttime temperature setback has little effect because the floor acts as a heat storage mass. This means it doesn’t actually cool down during the night, but only starts to cool towards the morning. At that point, the heating system has to work to reheat the slow-responding heat storage (the floor). If you want to implement a setback, it should be done earlier in the evening so that the floor cools down by bedtime, but then heating should also start earlier again to ensure it’s warm enough by the time you wake up. Of course, this can also be adjusted differently for workdays and weekends. For example, in our case, no one is home during the weekdays, so it only needs to be warm from the late afternoon onwards.
But as you already mentioned, new buildings don’t cool down very quickly anyway.
How this works with radiators is probably a different matter altogether.
But as you already mentioned, new buildings don’t cool down very quickly anyway.
How this works with radiators is probably a different matter altogether.
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PhoenixDH2 Jan 2015 09:36It makes sense that this doesn’t bring any benefit compared to panel radiators due to inertia and heat storage.
But especially when nobody is home all day and the windows are well insulated, I think it is more economical than if it runs continuously.
But I will do the test when I have a day at home.
But especially when nobody is home all day and the windows are well insulated, I think it is more economical than if it runs continuously.
But I will do the test when I have a day at home.
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PhoenixDH13 Jan 2015 07:44So, our stove is arriving today, I’m curious to see how it performs.
It is a storage heater designed for supplementary heating and for aesthetic purposes.
I don’t plan to make any changes to the heating controls, as that would mean fiddling with settings on days when the stove is off.
We are hoping to save energy by turning off the thermostats when the warm air circulates throughout the house.
Let’s see how it goes...
It is a storage heater designed for supplementary heating and for aesthetic purposes.
I don’t plan to make any changes to the heating controls, as that would mean fiddling with settings on days when the stove is off.
We are hoping to save energy by turning off the thermostats when the warm air circulates throughout the house.
Let’s see how it goes...
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DerBjoern13 Jan 2015 08:53In December, we used 100m³ (3,531 cubic feet) of gas. The ground floor was fully heated to 21-22°C (70-72°F). The upper floor was left unheated except for the bathroom, but the rooms still stayed around 20°C (68°F).
Overall, since moving in on February 15th last year, we have used 480m³ (16,952 cubic feet) of gas.
Overall, since moving in on February 15th last year, we have used 480m³ (16,952 cubic feet) of gas.
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