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Old 12-01-11, 07:24 AM   #141
Viking House
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Hi, I was checking links to my website and found this forum, its been interesting reading!
I build Passive Houses in Ireland and the UK and we make our own HRV units that fit completly into the external wall. We fitted close to 50 units this year and they seem to be working well with higher return air temperatures than some of the PH Certified Paul units. We use Copper fine-wire heat exchangers that have 20km of wire in each heat exchanger.

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Old 12-01-11, 07:32 AM   #142
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Welcome to the site Viking House. You make what we dream of! Would it be possible for you to share plans of your HRV units with us? Do you have any idea how efficient they are?
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Old 12-01-11, 08:01 AM   #143
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I have some data from a data logger but the file is too big to upload. I remember last January when it was -13 degrees C the return air temperature was +17 degrees C, and the house temperature was 19 degrees.
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Old 12-01-11, 10:13 AM   #144
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Quote:
Originally Posted by Viking House View Post
I have some data from a data logger but the file is too big to upload. I remember last January when it was -13 degrees C the return air temperature was +17 degrees C, and the house temperature was 19 degrees.
That sounds very hi-performance to me! But, that fine-wire hardware
might not be something that a DIYer could duplicate in a home shop..

If it turns out that I have to install an HRV unit in my basement,
I hope it won't turn out to be too expensive.
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Old 12-01-11, 01:55 PM   #145
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Well, I suppose I could sell you some heat exchangers at cost (€150 each plus transport) if you want to try them out?

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Old 12-01-11, 02:43 PM   #146
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Quote:
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Well, I suppose I could sell you some heat exchangers at cost (€150 each plus transport) if you want to try them out?
You certainly have my attention.

Will there be issues with US electricity?

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Old 12-01-11, 03:11 PM   #147
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That €150 is just for the FiWi heat exchanger, not the box, motors or electronics! You can use US fans and control them with a potentiometer and make your own box, have you looked at EC fans?

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Old 12-01-11, 05:31 PM   #148
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Quote:
Originally Posted by Viking House View Post
That €150 is just for the FiWi heat exchanger, not the box, motors or electronics! You can use US fans and control them with a potentiometer and make your own box, have you looked at EC fans?
OK, according to today's exchange rate, that would be $202 US. So how much do you suppose shipping might be?

Also, how does someone clean one of these units to remove fine dust, etc?

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Old 12-01-11, 06:25 PM   #149
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Viking House,

I just noticed that on your Viking House page, you said,

Quote:
"Water Vapour and CO2 levels equalise rapidly in air at speeds of + - 500m/sec so they don’t need to be chased around the house with ducts..."
I just looked it up and the speed of sound is 343.2 metres per second, so your Heat Exchange Ventilator appears to be Super-Sonic.

Do you have problems with the sonic boom when the unit is operating?

Concerned,

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Old 12-02-11, 02:25 AM   #150
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Quote:
Originally Posted by AC_Hacker View Post
"Water Vapour and CO2 levels equalise rapidly in air at speeds of + - 500m/sec so they don’t need to be chased around the house with ducts..."
I got the vapor equalization speed figures from one of the science guys on the UK Green Builders Forum who is usually pretty reliable, I tried to verify the by doing some Google searches but failed so I'll probably reword it and leave out the "at speeds of + - 500m/sec" bit!


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