DIY ventilation heat exchanger - Page 53

kostas · 06-30-17, 03:33 AM

Quote:

Originally Posted by Zwerius

Looks good.
Did you do any temperature measurements in/out and in/out?
So what's the efficiency?

Yes, over 90% with 20º C Δt

Fornax · 07-04-17, 04:45 AM

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

kostas · 07-04-17, 04:50 AM

Thanks, Fornax. It was a promise I made to the whole community of tinkerers out there, I hope it helps!

tinco · 07-04-17, 06:10 PM

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).

kostas · 07-27-17, 08:00 AM

Tinco, as you can see here the calculation is on a 21° dT basis.
Maybe you should consult the ASHRAE requirements for more details.

kostas · 09-19-17, 08:09 AM

Glad to help!

gregoinc · 09-19-17, 09:10 PM

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

gregoinc · 09-21-17, 08:17 PM

Quote:

Originally Posted by kostas

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?

kostas · 09-22-17, 03:29 AM

Thanks mate!

It is aluminium tape, used for insulating heat pipes and stuff like that. You can find it the hardware shop.

t1mtnntgn · 09-22-17, 09:05 PM

i like you

07-04-17, 04:45 AM	#522
Fornax Helper EcoRenovator Join Date: Oct 2012 Location: Beuningen (Gld), the Netherlands Posts: 64 Thanks: 4 Thanked 19 Times in 16 Posts	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

07-04-17, 04:50 AM	#523
kostas Helper EcoRenovator Join Date: Dec 2012 Location: Venice, Italy Posts: 89 Thanks: 15 Thanked 41 Times in 19 Posts	Thanks, Fornax. It was a promise I made to the whole community of tinkerers out there, I hope it helps!

07-04-17, 06:10 PM	#524
tinco Lurking Renovator Join Date: Jan 2016 Location: The Netherlands Posts: 11 Thanks: 5 Thanked 0 Times in 0 Posts	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).

07-27-17, 08:00 AM	#525
kostas Helper EcoRenovator Join Date: Dec 2012 Location: Venice, Italy Posts: 89 Thanks: 15 Thanked 41 Times in 19 Posts	Tinco, as you can see here the calculation is on a 21° dT basis. Maybe you should consult the ASHRAE requirements for more details.

09-19-17, 08:09 AM	#526
kostas Helper EcoRenovator Join Date: Dec 2012 Location: Venice, Italy Posts: 89 Thanks: 15 Thanked 41 Times in 19 Posts	Glad to help!

09-19-17, 09:10 PM	#527
gregoinc Lurking Renovator Join Date: Sep 2017 Location: Australia Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts	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

09-22-17, 03:29 AM	#529
kostas Helper EcoRenovator Join Date: Dec 2012 Location: Venice, Italy Posts: 89 Thanks: 15 Thanked 41 Times in 19 Posts	Thanks mate! It is aluminium tape, used for insulating heat pipes and stuff like that. You can find it the hardware shop.

09-22-17, 09:05 PM	#530
t1mtnntgn Lurking Renovator Join Date: Sep 2017 Location: t1mtnntgn Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts	i like you