open_erv2

7 ms·

1.
by open_erv2 2y ago
Well this was fun and thanks for the discussion, everyone. People are surprisingly nice and sensible and positive here! I used to have another account but lost the password. Perhaps I'll be a reader here in the future. Anyway, I&#x2
2.
by open_erv2 2y ago
Yeah that would probably work, it's just a matter of cost. A lot of people balk at $700 CAD, the eventual price is supposed to be $1300 for a pair, you do that and you are looking at a lot of $ for the flow and energy recovered. The n
3.
by open_erv2 2y ago
I have a spreadsheet where I track all inputs, and unfortunately it's just the cost of everything. The filament really doesn't help, but it also takes a lot of labor, and paying off the dev cost is also an important factor. Most
4.
by open_erv2 2y ago
thanks will do
5.
by open_erv2 2y ago
I have traced the air with a smoke generator, there is a youtube video of me doing this on my youtube channel. There is not significant re-inhalation (short circuiting) of the air. The reason for the window mount is that a lot of people r
6.
by open_erv2 2y ago
That is half correct. The TW4 units operate in synchronized pairs. When one is exhausting (egressing), the other is ingressing (bringing air in). This always happens. They even have quite nice pressure sensors that precisely regulate th
7.
by open_erv2 2y ago
You have to look closely at the actual test protocol, which they rarely share. And in reality noise is hard to measure and hard to understand. There is also SPL and SWL, which are not the same. The marketing department has no clue and co
8.
by open_erv2 2y ago
There is some stuff in the other projects page on the website, that project went really well too, I spend most of my time on that these days, the ERV is a longer term thing, the fan has a finish line but in a way is more epic/important
9.
by open_erv2 2y ago
I invented a process using some environmentally friendly solvents, grinding the sorbent and so on. It is not diy friendly unfortunately so there is little point in sharing the recipe.
10.
by open_erv2 2y ago
My price is for a pair, remember, not one. And those pioneer things don't work very well, poor flow and efficiency unfortunately. They claim high efficiency but it's only at the lowest flow rates and not the average for the cycl
11.
by open_erv2 2y ago
The MPLA (not pla) does not absorb the water vapor, but it condenses on the plastic and then evaporates. There is also the option of sorbent, which grabs the water vapor and then releases it with each cycle, before condensation occurs, get
12.
by open_erv2 2y ago
The step files are also there, which is the best common denominator for CAD files. Again, it's open source for the purpose of maintenance and repair, not cloning, and frankly earlier on I did make it more community oriented and nobod
13.
by open_erv2 2y ago
There is the tw4, which is made to be put in a wall, and there is the WM12, which goes in the window. The main focus is the TW4. There are instructions in the manual for making an ERV core. It is not trivial.
14.
by open_erv2 2y ago
I'm planning to just putter along selling units, making about 50% of my living like that, and if a company comes along and wants to buy the design/company that's good. If not, I get some stuff done, earn a living. This isn&
15.
by open_erv2 2y ago
That's an amazing project! I'm blessed to be in such company. Seriously, I use open source stuff and I prefer to do business with such relatively wise people. If you want a beta unit, email me and I'll put you at the top o
16.
by open_erv2 2y ago
You can add a filter to the TW4, there is an adapter/kit. It's a hepa filter from a car cabin filter system design. You rarely need both anti pollen and also ERV, so you would take the heat exchanger out and just use the filter
17.
by open_erv2 2y ago
It condenses on the heat exchanger, then it evaporates when the airflow reverses direction. That's if you don't have sorbent. If you have sorbent, it gets grabbed out of the air before it can condense.
18.
by open_erv2 2y ago
The filter is a bit messed up right now, you can put one on the TW4 but not the WM12.
19.
by open_erv2 2y ago
It's better compared to a blauberg vento or lunos e2. That product probably gets poor efficiency, I have not checked the technical sheet but if they say 80% that means at the minimal flow levels, which are only 10 cfm or something. T
20.
by open_erv2 2y ago
As a community we need to do some thinking on how open source may sensibly be applied to hardware. Unfortunately Prusa, who used to be a real champion, has departed from the assumed True Path, and they have discussed their reasons, which a
21.
by open_erv2 2y ago
The file limit sizes on github are a problem, there is some workaround but I haven't gotten around to dealing with it yet.
22.
by open_erv2 2y ago
My basic understanding is that the thermal energy also costs a lot more over there than it does in north america, like 4x as much.
23.
by open_erv2 2y ago
Thank you, this is correct. Using my class 2 sound meter, if I stand in my house in nowhereland cornwall with power shut off to the whole house, it's 38 dBa. 37 dBa is audible in that environment but nearly inaudible in a normal envi
24.
by open_erv2 2y ago
The TW4 is light years ahead. Higher flow, better efficiency, much quieter, wind compensation, Internet of things functionality. It's not just yet another machine of the same kind. The heat exchanger is very different, the whole des
25.
by open_erv2 2y ago
It's actually a regenerative heat exchanger: https://en.wikipedia.org/wiki/Regenerative_heat_exchanger .
26.
by open_erv2 2y ago
Look up the price of a blauberg Vento or a Lunos e2. They are ~$1800 CAD, and they get a fraction of the airflow. Computers have a large ecosystem behind them and have been in development for a very long time. This is still at the start
27.
by open_erv2 2y ago
Hey guys, I am the guy behind the OpenERV company, who designed the TW4 and WM12 ERV units. I'm sorry I don't have a bunch of units ready to ship out, as the site says it's still in beta, I am to be honest kind of taking my t