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Old 06-30-17, 03:33 AM   #521
kostas
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Quote:
Originally Posted by Zwerius View Post
Looks good.
Did you do any temperature measurements in/out and in/out?
So what's the efficiency?
Yes, over 90% with 20 C Δt

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Old 07-04-17, 04:45 AM   #522
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I watched all the videos and that was an hour of my life well spent!

You impress me with how thought through the design is with all the controlls of the various valves and airpathways and the amount of electronic controlls and sensors in the HRV you built. And on top of that the efford you put in filming -every- stage of building it, from multiple angles. I approve
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Old 07-04-17, 04:50 AM   #523
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Thanks, Fornax. It was a promise I made to the whole community of tinkerers out there, I hope it helps!
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Old 07-04-17, 06:10 PM   #524
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Wow that's very impressive Kostas, those valves are exactly what I was worrying about, I will take some time to figure out everything you did.

I have a question about the heat exchangers, here people are talking about 20dT efficiency. To qualify for the subsidy my heat exchanger needs to be at least 90% efficient, it is not said at what thermal difference that efficiency should hold, but the commercial ones all list a single efficiency as conforming to the EPN (Energy Performance Directive) norm.

Does anyone have an idea how this norm might be established? It seems all commercial exchangers perform well in excess of 90% (some even 95%) even though 20dT is not very common at all (in The Netherlands I think the average would be closer to 10dT).
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Old 07-27-17, 08:00 AM   #525
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Tinco, as you can see here the calculation is on a 21 dT basis.
Maybe you should consult the ASHRAE requirements for more details.
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Old 09-19-17, 08:09 AM   #526
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Glad to help!
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Old 09-19-17, 09:10 PM   #527
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First time poster, so hope I am asking this question in the best thread. If not, your advice on the most appropriate thread is appreciated.

I am currently building a HRV/ERV, but with a twist, in that it will be used to cool a small computer room in my home i.e. the external 'cooler' air will lower the temperature of the heat exchanger, which in turn will lower the temperature of the internal air.

I've noticed some of you building your own ERV/HRV units have been lining the enclosure with what looks like an adhesive product with a silver (aluminium) looking backing. I assume this is being used as a noise deadener/insulation or condensation protection.

I have also noted some of you using a silver tape to join everything together, and I suspect to water/air proof some sections of the ERV/HRV.

Is one of you able to give me advice on the lining and tape products you have used?

Thanks, Mark
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Old 09-21-17, 08:17 PM   #528
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Quote:
Originally Posted by kostas View Post
Hi guys, what goes around comes around, so here I am with the latest news: I finally finished my diy HRV system!To be honest I completed and installed it last February but only now I managed to make the video tutorial, as promised.
It is in Italian, as well as my blog, but I added some english subtitles so everyone can understand. I hope you enjoy!
Hi Kostas, awesome videos. What was the silver adhesive tape you were using in the video?
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Old 09-22-17, 03:29 AM   #529
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Thanks mate!
It is aluminium tape, used for insulating heat pipes and stuff like that. You can find it the hardware shop.
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Old 09-22-17, 09:05 PM   #530
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i like you

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