ᐅ Decentralized residential ventilation, exhaust air heat pump – any experience?
Created on: 17 Jan 2014 08:02
C
Chris1984
Hello everyone,
My wife and I plan to start building our single-family house near Bonn later this year. After numerous consultations (both in the area of prefabricated and solid construction), the company V***Haus is currently one of our top choices as a developer. Unlike many other developers, V***Haus installs a decentralized ventilation system instead of a centralized one. Fresh air is supplied directly through sound-insulated vents in the walls, rather than being drawn in at a single point like in central systems, warmed via a heat exchanger using exhaust air, and then distributed through ductwork; however, the heat stored in the exhaust air is still recovered efficiently through an exhaust air heat pump from Nibe that feeds the underfloor heating system. From my perspective, this system (like many others) has several advantages and disadvantages:
Pros:
+ Air does not need to be supplied through a maintenance-intensive duct system
+ Higher air quality as a result
+ Growth of germs and mold inside ductwork is not a factor
+ Waste heat can be utilized more efficiently in the exhaust air heat pump than in the heat exchanger of a central ventilation system
Cons:
- Air supplied to the rooms is at outside temperature (warm in summer, cold in winter)
- If the vents do not seal properly, drafts can occur
- Possibly similar to the effects of "tilt window ventilation"
Overall, I really like the concept, and I also prefer the operation of the exhaust air heat pump compared to a conventional air-water heat pump. My concern (or fear) is that during the deep winter, I might find myself sitting there while (exaggerating intentionally) -20°C (-4°F) cold outside air flows in through the vents, and the underfloor heating below at 50°C (122°F) struggles desperately to keep the room warm. It is generally agreed nowadays that permanent tilt window ventilation is harmful to the building fabric. So what is the difference here? Is it the air volume flow, which in this kind of ventilation is simply much lower (and above all, controlled)???
My question is therefore: Has anyone here had experience with this type of decentralized ventilation system? What do you think about it? Where do YOU see advantages and disadvantages??? I would appreciate hearing some of your thoughts on the topic.
Best regards,
Chris
My wife and I plan to start building our single-family house near Bonn later this year. After numerous consultations (both in the area of prefabricated and solid construction), the company V***Haus is currently one of our top choices as a developer. Unlike many other developers, V***Haus installs a decentralized ventilation system instead of a centralized one. Fresh air is supplied directly through sound-insulated vents in the walls, rather than being drawn in at a single point like in central systems, warmed via a heat exchanger using exhaust air, and then distributed through ductwork; however, the heat stored in the exhaust air is still recovered efficiently through an exhaust air heat pump from Nibe that feeds the underfloor heating system. From my perspective, this system (like many others) has several advantages and disadvantages:
Pros:
+ Air does not need to be supplied through a maintenance-intensive duct system
+ Higher air quality as a result
+ Growth of germs and mold inside ductwork is not a factor
+ Waste heat can be utilized more efficiently in the exhaust air heat pump than in the heat exchanger of a central ventilation system
Cons:
- Air supplied to the rooms is at outside temperature (warm in summer, cold in winter)
- If the vents do not seal properly, drafts can occur
- Possibly similar to the effects of "tilt window ventilation"
Overall, I really like the concept, and I also prefer the operation of the exhaust air heat pump compared to a conventional air-water heat pump. My concern (or fear) is that during the deep winter, I might find myself sitting there while (exaggerating intentionally) -20°C (-4°F) cold outside air flows in through the vents, and the underfloor heating below at 50°C (122°F) struggles desperately to keep the room warm. It is generally agreed nowadays that permanent tilt window ventilation is harmful to the building fabric. So what is the difference here? Is it the air volume flow, which in this kind of ventilation is simply much lower (and above all, controlled)???
My question is therefore: Has anyone here had experience with this type of decentralized ventilation system? What do you think about it? Where do YOU see advantages and disadvantages??? I would appreciate hearing some of your thoughts on the topic.
Best regards,
Chris
€uro – that sounds a bit paranoid. What the building expert says is the most accurate.
We also built with them. The only issue is the energy consumption of the heat pump. None of your cons really apply:
- Supply temperature is a maximum of 35°C (95°F)
- All filters are standard cheap G2 filter mats
- There is no noticeable draft
- During tilt ventilation, air also escapes to the outside.
In the end, a separate mechanical ventilation system with heat recovery costs between 10,000 and 15,000 euros, which is something you shouldn’t forget.
DaveS
We also built with them. The only issue is the energy consumption of the heat pump. None of your cons really apply:
- Supply temperature is a maximum of 35°C (95°F)
- All filters are standard cheap G2 filter mats
- There is no noticeable draft
- During tilt ventilation, air also escapes to the outside.
In the end, a separate mechanical ventilation system with heat recovery costs between 10,000 and 15,000 euros, which is something you shouldn’t forget.
DaveS
Chris1984 schrieb:
Pros:
+ Air does not have to be routed through a maintenance-intensive duct system
+ Higher air quality as a result
+ Germ and mold growth in the duct system is not an issue
+ Waste heat can be utilized more efficiently in the exhaust air heat pump than in the heat exchanger of a central mechanical ventilation systemSales arguments from V***brock?
Bauexperte schrieb:
... You should be able to recognize its houses even without any signs. ...That’s a bit harsh now
B
Bauexperte25 Aug 2014 00:22Good evening young lady,
Regards, Bauexperte
ypg schrieb:Why mean? The respected colleague is easily recognized by the red tents everywhere
That’s really mean now
Regards, Bauexperte
Bauexperte schrieb:
...
Why mean? The respected colleague is widely recognized by the red tents Oh, up here in the north the tents are white. In our new development, 7 out of 6 houses were built without tents – but unfortunately, they all look uniform. I thought your comment was referring to that characteristic.
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