ᐅ 1 Year with the Ventilation System: Clarity, Facts, and Energy Costs
Created on: 27 Aug 2013 23:56
B
Bastelwastel
Hello, this is my first post here in the forum,
this post is meant to provide practical facts for those who are still undecided!
We have been living in our new build for 2.5 years now, and since August of last year I have been diligently recording the gas meter readings and entering them into a spreadsheet. I compared the actual consumption values with the forecasted values from the energy certificate, resulting in a nice consumption statistic for the billing period 2012/2013.
About the house:
Single-family house, two stories, with 220 sqm (2370 sq ft) plus a full basement.
Basement: waterproof concrete, insulation?
Ground floor and first floor: cavity brickwork, insulation 0.35 from Knauf, 15 cm (6 inches) (the black one)
Windows: triple-glazed with external blinds, large window front facing southwest
Heating: underfloor heating, gas condensing boiler with solar hot water and heating support
Ventilation: Paul Novus 300 (with touchscreen display)
Back when planning, we had to insist quite strongly on the ventilation system since it was new territory even for our architect. And today I can say YES, the money was worth it.
In our energy certificate prepared by the structural engineer, the ventilation system was not included. We arrived at a value of 69 kWh/sqm per year (kWh/sqm a).
Now the E.On billing year has "finally" ended and I was able to do the evaluation.
Despite the rather long winter (in April and May we consumed much more than in the energy certificate forecast), we ended up with a consumption value of 56 kWh/sqm per year (kWh/sqm a). Since domestic hot water energy is included in this figure, the number of occupants is also important. We live in the house with two adults and two small children.
Because I installed two small electricity meters (about the size of a circuit breaker) during the electrical installation, I know exactly how much the ventilation system and how much the heating and solar system including all pumps etc. consumed.
Ventilation: 323 kWh
Heating: 383 kWh
Regarding ventilation in general: simply brilliant!
The Novus 300 at our place is set to the normal load of 60% and it runs every day. At night on level 1 (power 20%) and when necessary on level 3 (which I set to 100%).
The comfort gain is mainly noticeable in winter.
One example:
In the evening after showering or bathing, everything is wet. What do you do when you're done? Open the window and let in the -10°C (14°F) cold air or just tilt it and then forget to close it, and in the morning you freeze on the toilet seat and the radiator thermostat runs full power because of frost protection.
BUT! Not in our house, because we keep the windows closed and the ventilation system takes care of the rest (then on level 2). In the morning it's not musty and everything is dry.
Second example:
We have a utility room on the ground floor with an exhaust vent where we dry laundry, and this works very quickly thanks to the constant air exchange while the windows remain closed (great for anyone with pollen allergies).
What I have often heard is that some are afraid there might be drafts at the doors or whistling noises. We don’t have that problem, even at full power. For the glass doors, the frames were simply installed slightly higher to allow an air gap. The best way to demonstrate the airflow is with a lighter flame or standing barefoot directly at the bathroom door—that’s when you realize what’s happening.
One negative issue:
I made the supply and exhaust air ducts through the basement light wells to the outside ("special basement windows"). Normally no problem, but at the exhaust air shaft the air noise is clearly audible and that is also where the terrace is, which is a little annoying. But when we sit there in summer, we just turn the system off or set it to level 1.
I could list many more positive examples.
If anyone has questions, feel free to contact me! I’m happy if I can help.
P.S.: I am not a salesperson and have absolutely NOTHING to do with the mentioned companies!
this post is meant to provide practical facts for those who are still undecided!
We have been living in our new build for 2.5 years now, and since August of last year I have been diligently recording the gas meter readings and entering them into a spreadsheet. I compared the actual consumption values with the forecasted values from the energy certificate, resulting in a nice consumption statistic for the billing period 2012/2013.
About the house:
Single-family house, two stories, with 220 sqm (2370 sq ft) plus a full basement.
Basement: waterproof concrete, insulation?
Ground floor and first floor: cavity brickwork, insulation 0.35 from Knauf, 15 cm (6 inches) (the black one)
Windows: triple-glazed with external blinds, large window front facing southwest
Heating: underfloor heating, gas condensing boiler with solar hot water and heating support
Ventilation: Paul Novus 300 (with touchscreen display)
Back when planning, we had to insist quite strongly on the ventilation system since it was new territory even for our architect. And today I can say YES, the money was worth it.
In our energy certificate prepared by the structural engineer, the ventilation system was not included. We arrived at a value of 69 kWh/sqm per year (kWh/sqm a).
Now the E.On billing year has "finally" ended and I was able to do the evaluation.
Despite the rather long winter (in April and May we consumed much more than in the energy certificate forecast), we ended up with a consumption value of 56 kWh/sqm per year (kWh/sqm a). Since domestic hot water energy is included in this figure, the number of occupants is also important. We live in the house with two adults and two small children.
Because I installed two small electricity meters (about the size of a circuit breaker) during the electrical installation, I know exactly how much the ventilation system and how much the heating and solar system including all pumps etc. consumed.
Ventilation: 323 kWh
Heating: 383 kWh
Regarding ventilation in general: simply brilliant!
The Novus 300 at our place is set to the normal load of 60% and it runs every day. At night on level 1 (power 20%) and when necessary on level 3 (which I set to 100%).
The comfort gain is mainly noticeable in winter.
One example:
In the evening after showering or bathing, everything is wet. What do you do when you're done? Open the window and let in the -10°C (14°F) cold air or just tilt it and then forget to close it, and in the morning you freeze on the toilet seat and the radiator thermostat runs full power because of frost protection.
BUT! Not in our house, because we keep the windows closed and the ventilation system takes care of the rest (then on level 2). In the morning it's not musty and everything is dry.
Second example:
We have a utility room on the ground floor with an exhaust vent where we dry laundry, and this works very quickly thanks to the constant air exchange while the windows remain closed (great for anyone with pollen allergies).
What I have often heard is that some are afraid there might be drafts at the doors or whistling noises. We don’t have that problem, even at full power. For the glass doors, the frames were simply installed slightly higher to allow an air gap. The best way to demonstrate the airflow is with a lighter flame or standing barefoot directly at the bathroom door—that’s when you realize what’s happening.
One negative issue:
I made the supply and exhaust air ducts through the basement light wells to the outside ("special basement windows"). Normally no problem, but at the exhaust air shaft the air noise is clearly audible and that is also where the terrace is, which is a little annoying. But when we sit there in summer, we just turn the system off or set it to level 1.
I could list many more positive examples.
If anyone has questions, feel free to contact me! I’m happy if I can help.
P.S.: I am not a salesperson and have absolutely NOTHING to do with the mentioned companies!
@Steusel 13,750 kWh for 10 months (KfW 70). I think that’s a bit high, but you have to keep in mind that this also includes the drying heating time for the screed and excessively high settings during the period before moving in, so the entire drying heating process is included.
Additionally, we have an open space above the stairwell, which increases the cubic meters of our house.
Where are you building in Hamburg? asks Yvonne
Additionally, we have an open space above the stairwell, which increases the cubic meters of our house.
Where are you building in Hamburg? asks Yvonne
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Sebastian7917 Feb 2015 15:58More important would be what type of heating system you (ypg) have.
Screed drying consumes a lot of energy, so the consumption during the first year should not be used as a reference – it is usually drastically reduced afterward.
What are the dimensions of your air space? I’ve read about it from you several times and I’m increasingly interested.
Screed drying consumes a lot of energy, so the consumption during the first year should not be used as a reference – it is usually drastically reduced afterward.
What are the dimensions of your air space? I’ve read about it from you several times and I’m increasingly interested.
ypg schrieb:
@Steusel 13,750 kWh for 10 months (KfW 70). I think that’s a bit high, but you have to consider that this also includes the drying heating period for the screed and a much too high setting during the time before moving in, so the entire drying heating is included.
Also, we have an open space between floors – which increases the cubic meters of our house.
Where exactly are you building in Hamburg? asks YvonneHey, and thanks again...
No, we don’t want to build in Hamburg but in Halstenbek. It’s near Hamburg.
Lexmaul79 schrieb:
It would be more important to know what type of heating system you (ypg) have.Yes, I hadn’t thought about that since the first year is not important to me anyway, so it’s not a reference.
Still, here is the information: we have a conventional gas heating system that has proven reliable for us, supported by solar thermal for hot water. There is also a controlled ventilation system with heat recovery.
Lexmaul79 schrieb:
What are the dimensions of your open space? I have read about it several times from you and I’m increasingly interested.It is as large as our living area.
I don’t remember the exact measurements, roughly 5.5 x 4.5 meters (18 x 15 feet), so about 30 cubic meters (1,060 cubic feet), plus the gallery on the upper floor up to the roof adds around 6 cubic meters (210 cubic feet). So compared to a ceiling height of 3 meters (10 feet), which many imagine for the ground floor, it is equivalent.
My avatar shows the view from the sofa looking upwards.
We have a staggered shed roof, and the lower roof is not intended for living space—just right if you need less room on the upper floor.
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