DIY Heat Recovery Ventilators for 50$. How HRV Works.
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- Опубликовано: 27 май 2021
- This video is about Heat Recovery Ventilators (or Recuperator) and to improve your indoor air quality efficient way. It’s not difficult to do your own homemade HRVs. I explain how air heat exchanger works, what’s the main parts, what to pay attention to when choosing parts for DIY recuperator. Here I use my own heat exchanger design made from PCV and aluminium tubes.
I made two types of recuperator with my own hands. Comparison of noise and temperature indicators. Temperature measurements using a thermal imager. Experiments are carried out at home.
In next videos I’ll show improved version of Heat Recovery Ventilator - a bit more expensive, but more efficient.
#diyyari #diy #diycraft #diyideas #homeventilation #homeimprovement #recuperator #heatexchanger #ventilation
Fans - Deepcool Gammaxx 200 s.click.aliexpress.com/e/pm8p8pDq
Timer Relay Module - S08 s.click.aliexpress.com/e/BtFhuu16
Thermal Camera - HT-102 s.click.aliexpress.com/e/NfAVYA4s
3D Printing Model STL File - yadi.sk/d/GJjsmuqF6R8JAQ
3D Model of the Recuperator for Compas 3D - yadi.sk/d/Mqo0RXwWixz1Tg
Write your opinions, questions, ideas in the comments.
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Хобби
Use solid state switching: triac or mosfet or transistor (reduces relay noise). Use a polarity reverse on both fans instead of switching between one or the other (to use 2 fans always instead of just one or the other at once). Add a pause at the switch event so the fans dont fight each other during free coaster transition (to reduce transitive state inneficiency )
you cant polarity reverse these fans. they have circuitry to limit spin in one direction. plus the blades arent design for that.
i do agree he should use an SSR instead of a mechanical relay. they can be quite compact. i have some that are 4-DIP single relay and 8-DIP double relay.
I build a comparable system 10 years ago. But used a self-made conventional heat exchanger (the square box with a diagonal orientated square radiator in it type). All you need to build it is a cheap roll of aluminium sheet. Installed a strong fan to blow the air in on one side of the celing of the balcony, added a stainless mesh, carbon and HEPA air filter in front of it, and cut an outlet vent oopening on the other side of the balcony.
next just cut an inlet and an outlet with a bathroom exhaust vent in every room, connect it all of it with duct pipes in the celing and its done.
Has cost me less than 50$ per room.. and you get a constant airflow.
the only problem is regularly changing the hepa filter and water accumulating in the pipes.
Thanks for this english version! Like your work!
Brilliant. I was looking at the price of these online and thought it was an excellent 3D printing challenge. I was thinking of something along similar lines to yours, but you answered some of the thoughts I was having.
What a great idea. Keep up the great work
Thanks! I was planning something similar but with peltier / thermoelectric device to act as a heat pump between the outgoing hot air and incoming cold air. Oh, I agree with the other comment that commercial units seem incredibly expensive for what they are!
TEC's are also wildly inefficient. 10-15% great way to waste power. in other words 85-90% of the power used is wasted.
you would be better off getting a mini split AC/heat pump. unless you just love wasting electricity.
SERIOUSLY DUDE - YOUR A DAMN GENIUS
An excellent little video, very clever.
Cheers from Oz
Brilliant. Thanks for sharing 👍
Brilliant, thanks for the video. How do you wire the Timer Realy Module? I'm looking for a (slient, non clicking relay), but not sure how to wire two fans like you do in the video.
Thanks you for sharing. Low energy can cooling room or heating room
one-way-Heat-Recovery-Ventilators work by storing heat. You did the opposite, by using aluminium (or any metal for that matter, but aluminium is surely the worst bet of all cheap metals). Spend additional 150$ and get the real deal with a ceramic core. If your wall is thick enough, get 2 ceramic cores, and set them up in series. That will raise efficiency from 90% to over 98%, like in the big centralized Heat Recovery Ventilation systems (for a fraction of the material/installation-cost, and space-demand). And if your wall isn´t as thick as 2-core-lengths, let the tube stick out of the wall, cause it´s still 100% worth it...
Well done! You've motivated me so much that I'm trying to make it myself. I just have a question: which program number to set on the relay module?
Only 7 minutes? Please do more! It was very interesting to watch, and even motivates to do something likewise. Nice job! :)
Is there any update video?
70 seconds
@@markthomasson5077 he means the duration of the video not the fan cycle 😁
Waaaaay above my pay grade. Love it.
This is probably the cheapest you’re going to get. If you cannot afford this, get a job.
@@petergoestohollywood382 The expression "above my pay grade" refers to skill level not wage level.
this is a neat idea
Very interesting. Thank you for sharing. I'm in need of continuous fresh air in my basement and I'll try to print your version. All the best.
Thank you. This version is more efficient ruclips.net/video/FUhvuhItX30/видео.html
Hi there
What is the name of that priting device creating the the white model?
Thanks
Brilliant
Nice video, thanks :)
Need to have 2 of these tubes. What goes out, has to come in from somewhere.
Underrated comment.
The first design is less than 50% efficient.
Need two units running in opposite phase.
While one is blowing air out, the other must blow in.
Then, let that run for a minute or so, and then reverse the flow. Repeat.
I am very interested and on how you set up the fans to switch back-and-forth, how do you get both fans to work with one outlet can you do a video on this just the switching alone is very powerful Thank you.
what about if the inside and outside air has different humidity? is there a way for water to escape?
Once saw a suggestion that one could make a heat recovery ventilator from disposable aluminum turkey pans. Stack them with spacers that block every other side to create the two separate airflow paths. Those pans are very inexpensive.
Just Amazing !!!
Coolest thing I learned Hyundai makes TV's
The noise is usually measured at a certain distance. Usually 1 meter.
Please what are the full elemen require to construct this device?
Nice video, could you also make one about the cooler :D
Is the point of this device to reduce temperature difference from inside to outside while a brief ventilation takes place?
whats keeps it from sucking bugs into your room?
also looks like a nice spot for bees to nest and clog it up. i didnt see an actual air filter despite you saying it has one.
Hello, Where can I buy this blue round fan. Link please. Thank you and greetings from Slovenia
What Im missing, what is the purpose? I dont really understand that, because the aluminium pipes dont really can store the heat, sure, hot air goes through and cold air gets out, makes sense to me, but the heat doesnt stays there for long, so how often does it will switch and well, why? Just to have clean air? in Germany we just open the window for few minutes and close it, so we have fresh air and the room doenst cool down too much.
Whats the difference between this and a real vmc?
How thick is the sheet metal?
I have an Idea to make similar device but for the heat exchanger I am planning to use a core from car DPF. This will act as 1. heat exchanger, 2. Air filter, 3. sound insulation.
Important note: if your fan says it moves 100 units od air per unit of timer, it's possible that it will move just 10, if you coinstrain the airflow.
yeah, sometimes fans have a diagram showing air flow vs the resistance they're pushing against, that can help a lot with picking the right fan
Well done on your development - keep it up! Love the video
Can anybody suggest to me where I can find ready-made units like this, desperately need 2 pcs???
Might be fun to try to make this with aluminum cans, and other junk from the recycling bin.
Hi, where can we buy your machine? Thank you
I liked the way you build the heat recovery ventilators, can you help me to build a project that I am working on?
To measure noise, u should put your phone 1 meter from the source. This is the standard distance used to measure noise in a laboratory. Using other distances gives you results that you can't compare to the data presented by fan manufacturers.
Hi can somebody tell me how he wired the control module and how he programmed it? I cannot see exactly how he did it in the video?
If somebody could guide me, I would really appreciate it, thanks! :)
Dame nice, its easy to see that the store version is a "bit" overpriced.
As i want 2 for roof, 4 basment, 1 floor level. Store 2-5k🤣, diy 0.6-1k "part dependant". Will check later videos to as alot can happen in a year of testing.
Hi, how many wires do the fans have and how did you connect them? How did you detect which is the plus to the fan, which is the minus and which are the other wires?
Your limit is the thermal capacity of your heat exchanger. A 2-way / cross-flow design is more complex but should let you go for a constant low flow rate being quite and economic.
Fkn awesome kid. Well done.
After seeing this video...one thing is clear:))....recuperators are extremely overpriced.
This version might have issues with freezing but is a very nice simple solution.
Some copper blades would work better - or even copper pipes.
Maybe a circular heating resistance from a hairdrier or something similar on the incoming air port - or a wiere like in the other video?
I like this version better because it uses less space and it is easyer to integrate in the wall.
One-way-Recuperator-cores aren´t overpriced at all (200$?), since they are made of heat-storing-ceramic, that was invented just recently... A recup-core of aluminium or copper defeats the purpose, since such metals (or any metal for that matter) cannot store heat at all (good heat inductors, the opposite of what a recup-core is). Use 2 ceramic-cores in series, to raise recup-efficiency from 90% to 98%, like the efficiency of big and expensive centralized recup-systems (contain expensive 2-way-recuperators of aluminium, but different working-principle).
@@klausbrinck2137 as far as I understand in this video is a 2 way recuperator. I paid almost 800dolars for prana - 2 way recuperator with almost the same principle but it has copper middle.
2 way recuperators are far superior to single way and ceramic.
@@titusm9837 But it is obviously an 1way, dirty/hot-air-out or cold/fresh-air-in... As said, those are used in pairs, on opposite wals of your house, and when one sucks, the other blows, subsequently the 1st one blows, and the 2nd sucks (recycling). In Germany, they claim 90% efficiency, while the 2-way-cental-ones claim 98% (these are the maximum-performances, for the sweet-spot-air-speed, which might be too low/high for u in several circumstances). But by using 2 ceramic-cores in series, you can greatly raise 1way-efficiency !!! 2-way-ones may have a plastic-recuperator, in Germany, that is as good a heat-inductor, as the expencive aluminium-recuperator would be, but much cheaper... (kunststoff-gegenstrom-wärmetauscher)
I wonder if you could get greater surface area of the recooperator if you were to use something like a bunch of fine aluminium swarf from a lathe?
Just use copper dish scrubbers?
as your design is restricting the the airflow, you wont get the 60 m3/h of air displaced, but far less. if you build 2 of your first design, each whit only one fan blowing outside, and change the relay to 2 transistors, you will get the 60m3/h flow you advertised, whit far cheaper material and less time to build. you need to sync them so when one is on the other is off. that way while one is pushing air out, the other is off and will let the air in. also, you need to add a delay timer so that both the fan stop rotating before switching direction, or you doors are gonna open/slam
3D metal printed intertwined heat exchanger opposing flows is the way to go. but too expensive for now. Good try the radial aluminum solution!
If you sharp the edges of the solid parts of the intake, you'll get a lesser loss of pressure
That doesn't make any sense. The air going out the fan is compensated by air entering the ambient from somewhere, unless the room (or whole house) is air-tight, and you're reducing the ambient's air pressure.
And that is not how a heat recuperator works.
It should have two "air circuits": one with the exhaust air going out, and one with the outside air coming in. They exchange heat on their way (inside air on it's way out, and outside air on it's way in), and then you have a working system.
I was thinking the same thing. I just assumed I wasn't paying enough attention and I missed the discussion of the air traveling in the other direction.
This was also my first thought watching the first attempt, but the second version resolves this with separated input and output paths with a fan blowing inwards on each end. The 3D printed end lets every second segment through, and each end is offset by one.
But I expect it'll suffer icing issues for sub-zero temperatures since one end of the device is always the cold end. To resolve that you'd need baffles in ducting so it could be switched to operate in in alternating directions.
Hello it would be very helpful if you posted the wiring. A close up photo is better.
Thank you for the video, It's a great idea.
Looks heavy. But great work.
I think if the fans were in a small pipe and the large pipe had your aluminum heat accumulators and then same way coming in that it would exchange heat better because the slow air going through their heating the aluminum up would have more time to eat it as it went through and when the cold air came in it would have more time to suck that heat back off of it does it came back in the house The center of the pipe needs to be large not the end of it
Change the timer circuit to use a mosfet instead of a colicky relay
You could make the heat exchanger with the 3d printer too. Less manual work. Use bigger surface area to compensate for plastics lower thermal conductivity, it will work :)
excellent job! I would just use copper sheet - far better thermal conductivity, antibacterial function of copper, does not corrode. Is it possible to update the electronics links? They are already broken. - Or give a name under which they can be searched. Thank you.
I'd imagine the power of the fans supply is more than heat recuperated?.
It's possible that glass tubes would be better for the regenerator.
The first version was less than 50% efficient. Probably between 30-40.
The problem here is that while the air is going out, there will need to be leaking the same amount of cold air in other places in the house.
And while the air is going in, you will expel warm air in other places in the house.
To get a higher efficiency, you need two units working in opposite phase. Like while one blows out - the other must blow in.
Cool idea, but having a 100 meter diameter hole in the wall seems like a too big drawback for me :/
the problem is dust and humidity, you would need a much bigger device.
So that design will not function like a commercial HRV. The design built doesn’t exchange the heat. The heat in a heat exchanger need to move the heat away from the tubes and into the space around the tubes. That generally requires a fan or pump moving air or liquid over the outside of the smaller tubes. The air or fluid on outside of the small tubes needs to be moved away from the tubes and that heat needs to be transferred to a different location then the air moving through the inside of the small tubes. Otherwise it is just a way to bring in unfiltered air slowly.
@5:17..why there is a 10Rupee Indian currency note there...Did you went to India..! :)
~ñamaste from an Indian~
The first design is horribly inefficient with it only working optimally for the short period when it starts drawing in outside air and the aluminum hasn't given up all it's thermal energy. The second design is far better as heat exchange is continuous. As you noted the compact size puts some significant restrictions on how well it will exchange the air in the room. Putting ducts for intake and exhaust that go to the floor and ceiling respectively would already improve the design significantly, giving you room to add sound absorption and air filtration media too.
The concept is good but aluminum tubes is not as good as one might think.
I'd like to introduce the concept of volumetric heat capacity.
Where as One cm³ of sainless steel has a volumetric heat cacacity of about 3.84 J/cm³°K, aluminum has a lower volumetric heat capacity at 2.43 J/cm³°K. Joules per cm³ per degree rise in kelvin.
In other words, a stainless steel straw can hold more energy than an equally sized aluminum straw.
But that's not the only problem with aluminum. Aluminum conducts heat too good. One does not want heat traveling down the aluminum pipe from inside the house to outside the house. On thermal conductivity
Aluminum: 236 - 431 W/m°K
304 Stainless Steel: 16 - 21 W/m°K
If one is ok with aluminum's volumetric heat capacity, plastic straws might be an interesting alternative.
Polypropylene: 1.6 - 2.1 J/cm³°K
Polyethylene: 1.8 - 2.3 J/cm³°K
Polypropylene (PP): 0.20 - 0.35 W/m°K
Polyethylene (PE): 0.3 - 0.5 W/m°K
Plastic straws might very well be an attractive for their low cost and low thermal conductivity, despit their lower volumetric heat capacity.
My initial comment applied to cycling air through straws. If one does counter flow heat exchanger as the later half of the video, the thermal conductivity of aluminum is perfect.
A hole 100 meters in diameter would indeed be problematic XD
Use copper instead of aluminum
Mine's English too but my computer doesn't seem to understand me anymore it makes its own words up
Don't see this working, the airflows should be separated, not switched. The aluminium has very little heat capacity and cannot store that much heat energy.
5:19 10₹ rupee note
100m in diameter? That's quite a large hole 😂
20 dB of background noise?? Are you kidding??....that is lower than many recording studios......
Interesting, but your vid is very confusing. I have no Effing clue what you are trying to accomplish. What is the point????
$50 to build. First buy $10,000 in printers and tooling
Slava Ukraini comrade 😘
Indian 10 Rupee note in video.... r u Indian
ai voice or the narrator has the wierdest vocal i flections (or lack thereof) ever. Honestly, it was distracting. Would prefer human voice even if it's accented.
This is smi truck heater fan not ur project copy cat 😑
Thanks for sharing your project. Is there a specific reason you chose aluminum instead of copper?
Price probably. Sheet copper is crazy expensive
Laminar flow is great, but not related to heat exchanging.