ᐅ Decentralized Mechanical Ventilation – Yes or No? Pros and Cons?
Created on: 26 Feb 2016 13:15
N
nils1985
Dear Forum,
We are currently planning our new build, and I have now received the scope of work from our builder. First of all: one thing is certain, a central heat recovery ventilation system is out of the question because it is too expensive.
The basic data for our single-family house:
130 sqm (1,400 sq ft), underfloor heating on the ground floor and in the bathroom (upper floor), radiators everywhere else, all windows with roller shutters (thermally insulated roller shutter boxes with half-shells).
[U]According to our scope of work, the following is to be installed:[/U]
"Decentralized ventilation system Lunos e² with heat recovery (up to 90%), very low power consumption (only 0.09 watts / sqm (0.008 watts / sq ft) thanks to direct current), and a 10-year warranty on the ceramic heat exchanger. Fully integrated into the exterior wall. Exhaust fans as AB 30/60."
[U]Our wall construction is as follows:[/U]
- Double-shell facing masonry – total thickness of 45 cm (18 inches).
- Inner leaf – 17.5 cm (7 inches) thick aerated concrete blocks as plan bricks, WLZ 0.10, compressive strength PP2, brand Ytong.
- 14 cm (5.5 inches) hydrophobic (water-repellent) core insulation boards KDII with staggered joints, WLG 035.
- 2 cm (0.8 inches) air gap.
- 11.5 cm (4.5 inches) facing brick.
- U-value is approx. 0.16 W/m²K.
- Triple-glazed insulating glass as thermal insulation glass (Ug value 0.7 W/m²K).
Is it really necessary to install a heat recovery ventilation system? I know it prevents mold and ensures controlled air exchange. But is it really required? I am rather skeptical about it. I have already been in several houses (built from 2013 onwards) without heat recovery ventilation and haven’t noticed anything negative.
So far, the disadvantages outweigh the benefits for me (just my own opinion):
- Increased energy use (electricity, heat loss).
- Holes in the wall.
- Noise from external influences and the ventilation system itself.
- Energy loss during winter.
- Higher temperatures in the bedrooms during summer.
If we decide to go with a decentralized heat recovery ventilation system, how many fans would be needed? Where would it be advisable to install them?
Thank you in advance for your effort and opinions!!!
We are currently planning our new build, and I have now received the scope of work from our builder. First of all: one thing is certain, a central heat recovery ventilation system is out of the question because it is too expensive.
The basic data for our single-family house:
130 sqm (1,400 sq ft), underfloor heating on the ground floor and in the bathroom (upper floor), radiators everywhere else, all windows with roller shutters (thermally insulated roller shutter boxes with half-shells).
[U]According to our scope of work, the following is to be installed:[/U]
"Decentralized ventilation system Lunos e² with heat recovery (up to 90%), very low power consumption (only 0.09 watts / sqm (0.008 watts / sq ft) thanks to direct current), and a 10-year warranty on the ceramic heat exchanger. Fully integrated into the exterior wall. Exhaust fans as AB 30/60."
[U]Our wall construction is as follows:[/U]
- Double-shell facing masonry – total thickness of 45 cm (18 inches).
- Inner leaf – 17.5 cm (7 inches) thick aerated concrete blocks as plan bricks, WLZ 0.10, compressive strength PP2, brand Ytong.
- 14 cm (5.5 inches) hydrophobic (water-repellent) core insulation boards KDII with staggered joints, WLG 035.
- 2 cm (0.8 inches) air gap.
- 11.5 cm (4.5 inches) facing brick.
- U-value is approx. 0.16 W/m²K.
- Triple-glazed insulating glass as thermal insulation glass (Ug value 0.7 W/m²K).
Is it really necessary to install a heat recovery ventilation system? I know it prevents mold and ensures controlled air exchange. But is it really required? I am rather skeptical about it. I have already been in several houses (built from 2013 onwards) without heat recovery ventilation and haven’t noticed anything negative.
So far, the disadvantages outweigh the benefits for me (just my own opinion):
- Increased energy use (electricity, heat loss).
- Holes in the wall.
- Noise from external influences and the ventilation system itself.
- Energy loss during winter.
- Higher temperatures in the bedrooms during summer.
If we decide to go with a decentralized heat recovery ventilation system, how many fans would be needed? Where would it be advisable to install them?
Thank you in advance for your effort and opinions!!!
