Ventilation Made Easy
mpg.de
mpg.de
Here's a blog post with illustrations:
https://blog.hoffman-hoffman.com/blog/the-basics-of-displace...
I have not heard that Germany's winters have become particularly mild. In fact Mainz, where this was developed, often has high temperatures below freezing during the winter months. Having significant airflow without an HRV might make people a bit chilly in the morning.
Or would this still require the expensive filtration system in the winter?
You just saved 9kW of continuous power for the building during the winter with an ERV.
This is a neat idea that seems penny smart and pound foolish. For one, the article does not address overall system reliability and maintenance tempo. Given a low material to install cost ratio this is an important factor since repeated re-installation or rework will moot any cost savings from materials.
For two, ejecting the gases that have been expensively conditioned for thermal and humidity properties will drive up operating costs since replacement gasses will be required.
For three, hopefully they carefully plan for where the system exhausts since they have made something that concentrates contaminants as well as it evacuates them. To the extent that it uses tragedy of the commons to get better odds for people indoors by worsening odds for people outside that building, the primary innovation of the system is statistical arbitrage based on a larger outdoor volume.
This application optimizes exhaust in rooms with operable, high mounted windows for exhaust. Most rooms with expensive conditioning don't have operable windows, so it's not really an option to use this design for those anyway. In a heavily conditioned space, the expectation would be external air ventilation would be managed near the centralized air handlers. Plenty of options there, like HRV/ERV depending on climate specifics.
It might be possible to use a similar design to augment air returns from a conditioning system, but it's going to depends on the system if it would be useful or reasonable.
Really glad it is over and that it never got the point of me ever seeing such a thing.
I don’t see how this couldn’t possible be anything but beneficial in public places.
Is there actually any evidence of a positive effect?
Genuinely no idea what you are thinking with this or what the point of that PDF is.
is it? I think you may want to do some research of your own.
If you have zero evidence of a claim being true, stop making it.
>Pleasant, healthy air to breathe is the most important food for human beings.
To your point, the original post requested information specific to European standards where AC is not common. I don't care to spend time solving internet stranger’s problems but Minergie would be a good place to start because they presumably didn’t fabricate their standards. A curious, motivated person could track down whatever they’ve published, which is most likely in German.
“Our system also solves the long-standing problem of CO2 in classrooms, because it not only transports aerosols outside. It also cuts CO2 accumulation, helping students to concentrate better on their lessons.”Of course when I was in school we opened the windows to solve this massive issue, but times change I guess. Hopefully they also have an app, for the kids.
Can't say I have ever done that.
>To me it seems very logical that we should also treat the air to protect our health from diseases carried in the air.
There is an absolutely great feature of air, which makes it totally distinct from water. If you open the window inside and outside air will mix. I know this is kind of miraculous and might just be a very big deal, but I think it could allow us to replace the stale air in the inside with fresh air from the outside.
I think there are a few challenges to this:
1) It's mostly manual, compared to an automatic ventilation system. Perhaps if it were more automated, I'd agree with you.
2) If it's very hot or cold or humid outside, I think doing this can impact indoor conditions and I'm not sure how much that energy cost compares to other forms of ventilation.
3) Not every part of an indoor space is very close to a window. Large indoor spaces, underground indoor spaces, small ebclosed areas such as bathrooms in the middle of homes, etc., may make it hard to just open a window and flush out the "bad" air.
On the other hand, following the principle of “train high, play low” it might be better to educate in lower oxygen and then add oxygen to workplaces.
Anything which circulates the air will remove it.
>and opening the windows is not always feasible. For example, if the outside air is hot or humid.
I can tell you with 100% certainty that hot or humid air does not prevent you from opening a window. I myself have done this multiple times.
If your bio is up to date, I wish you the best in whatever your life situation.
Thankfully it isn't. And I escaped from writing software.
> Anything which circulates the air will remove [CO2]
Circulation does not remove CO2, only displace it from one place to another. To remove it, you need a scrubber [0].
Plus in Germany there are quite a few schools located directly at heavily used streets, so just opening windows will not exactly give you really fresh air (I mean, it will lower the CO2, but otherwise its going from one bad state into another), plus it increases the noise levels considerably.
And yes, ACs are still uncommon in Germany. In return, most buildings, including suburb style homes, are not just made from cardboard. This means the buildings have a lot of thermal inertia which can be used to manage heat during hotter phases.