Sun, 28 Jun 2026 10:30:22 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136284#Comment_136284 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136284#Comment_136284 Wed, 22 Feb 2012 18:15:55 +0000 SteamyTea It currently has no control over the incoming air (cold), the outgoing air (hot) is on a timer on the bathroom fan. You can see exactly when the bathroom is used on this chart and work out how much tea I drink if you are so minded.
Between 10:10 and 11:15 I kept the fan on constantly. The two spike before hand were shower times, guess who has the smaller spike?

The unit is pretty basic, just some plates in a box, a couple of fans and some pipe. Lots of room for improvement, tomorrow I shall go and get another fan with a timer on it.
Comments and suggestions welcome.

Efficiency has been calculated this way:
μt = (t2 - t1) / (t3 - t1)
where
μt = temperature transfer efficiency
t1 = temperature outside air before the heat exchanger (ºC)
t2 = temperature outside air after the heat exchanger (ºC)
t3 = temperature inside air before the heat exchanger (ºC)
 
 ]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136293#Comment_136293 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136293#Comment_136293 Wed, 22 Feb 2012 18:52:14 +0000 Ed Davies
Sorry, it was very mild here yesterday but I've no idea what temperatures were like at the other end of the island so it's difficult to be sure if that makes sense.

Still, 60 to 70% efficiency on a first attempt seems pretty encouraging. Look forward to more and piccies.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136305#Comment_136305 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136305#Comment_136305 Wed, 22 Feb 2012 19:36:17 +0000 SteamyTea
Just used http://www.engineeringtoolbox.com/heat-recovery-efficiency-d_201.html for the efficiency calculations.
Think that should be the classic 'up to' on the efficiency, you do get the greater efficiency with the lowest energy recovery by the looks of it.

This is the real outside temperature.
 
 ]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136311#Comment_136311 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136311#Comment_136311 Wed, 22 Feb 2012 19:46:57 +0000 joe90 ]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136312#Comment_136312 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136312#Comment_136312 Wed, 22 Feb 2012 19:49:13 +0000 SteamyTea https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136322#Comment_136322 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136322#Comment_136322 Wed, 22 Feb 2012 20:22:16 +0000 RobL Our MVHR unit (vent axia sentinel kinetic plus) uses thin plastic as the heat exchanger. From memory the heat exchanger's about 25*25*25cm in size & looks like it's made of a million straws. What material and construction are you using?]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136329#Comment_136329 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136329#Comment_136329 Wed, 22 Feb 2012 21:59:12 +0000 SteamyTea MkII will be a lot better.
I have drawn it up in Turbocad 17 but shall post it up here as a sketchup file (if I can zip it enough).
But here is a picture to be going on with.
 
 
 ]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136330#Comment_136330 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136330#Comment_136330 Wed, 22 Feb 2012 22:02:38 +0000 Cav8andrew https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136332#Comment_136332 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136332#Comment_136332 Wed, 22 Feb 2012 22:07:05 +0000 Citrus Posted By: joe90I love it, I am a real build it yourself fan and love what you are doing, I may not understand all the "numbers" but I will leave that to you and others as long as you post you're design for the unit and how you built it." alt="" src="https:///forum114/extensions/Vanillacons/smilies/standard/bigsmile.gif" >

Totally what he said.

I never understand all the maths, but show me a diagram and I'm away. Thank heavens there are people as awesome as the OP to work these things out. Thank you :D]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136333#Comment_136333 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136333#Comment_136333 Wed, 22 Feb 2012 22:08:09 +0000 SteamyTea ]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136334#Comment_136334 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136334#Comment_136334 Wed, 22 Feb 2012 22:10:54 +0000 SteamyTea Posted By: Cav8andrewyou weren't set designer on early Doctor Who series by any chance
Funny you should mention that, I have done some film work in the past and made a Dalek once. Did the helmets for Krull and some reindeer parts for Santa Klaus the Movie. That brings back memories.
Give me an 8 by 4 sheet and I can make anything ]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136335#Comment_136335 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136335#Comment_136335 Wed, 22 Feb 2012 22:12:46 +0000 SteamyTea ]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136336#Comment_136336 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136336#Comment_136336 Wed, 22 Feb 2012 22:13:32 +0000 Cav8andrew https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136337#Comment_136337 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136337#Comment_136337 Wed, 22 Feb 2012 22:18:00 +0000 SteamyTea https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136338#Comment_136338 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136338#Comment_136338 Wed, 22 Feb 2012 22:18:48 +0000 SteamyTea Posted By: Cav8andrewAlien V ST MVHR I see a franchise !
I see another cut finger]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136344#Comment_136344 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136344#Comment_136344 Wed, 22 Feb 2012 22:29:20 +0000 Citrus https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136346#Comment_136346 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136346#Comment_136346 Wed, 22 Feb 2012 22:32:01 +0000 joe90 ]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136347#Comment_136347 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136347#Comment_136347 Wed, 22 Feb 2012 22:32:55 +0000 SteamyTea I have a windows live account, shall see if I can get the files up there.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136348#Comment_136348 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136348#Comment_136348 Wed, 22 Feb 2012 22:34:09 +0000 Beau https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136352#Comment_136352 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136352#Comment_136352 Wed, 22 Feb 2012 22:39:13 +0000 SteamyTea https://skydrive.live.com/?cid=698CC0950B10CCBD&id=698CC0950B10CCBD%21120]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136356#Comment_136356 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136356#Comment_136356 Wed, 22 Feb 2012 22:49:57 +0000 Ed Davies
http://www.greenbuildingforum.co.uk/newforum/?PostBackAction=Download&AttachmentID=2741

but not this:

http://www.greenbuildingforum.co.uk/forum114/?PostBackAction=Download&AttachmentID=2741

ST: “is it a similar problem that we had with Jeremy's zipped files?”

Yes. “forum114” version has the same line-feed character stuck on the beginning which upset the archive manager for me. Downloading the “newforum” version opened in the archive manager then double clicking on the .skp file opened it in SketchUp just fine.

I'd strongly recommend the use of layers in SketchUp to allow showing cutaway drawings easily.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136377#Comment_136377 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136377#Comment_136377 Thu, 23 Feb 2012 07:36:43 +0000 Cav8andrew https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136378#Comment_136378 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136378#Comment_136378 Thu, 23 Feb 2012 07:39:13 +0000 Beau https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136379#Comment_136379 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136379#Comment_136379 Thu, 23 Feb 2012 07:40:33 +0000 Cav8andrew https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136381#Comment_136381 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136381#Comment_136381 Thu, 23 Feb 2012 07:45:53 +0000 Beau https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136382#Comment_136382 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136382#Comment_136382 Thu, 23 Feb 2012 07:50:30 +0000 SteamyTea https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136383#Comment_136383 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136383#Comment_136383 Thu, 23 Feb 2012 07:52:57 +0000 Beau ]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136384#Comment_136384 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136384#Comment_136384 Thu, 23 Feb 2012 07:55:48 +0000 Cav8andrew ST, will try again but did not appear to be opening but could well be me.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136385#Comment_136385 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136385#Comment_136385 Thu, 23 Feb 2012 08:20:38 +0000 rvb99
http://vmc-double-flux-auto-construction.blogspot.com/

there's another at http://www.autoconstruction.info/techniques/energie-chauffage-isolation/la-fabrication-d-un-recuperateur , which is built using honeycombe plastic pannels, rather than aluminimum.

There's plenty of pictures, and if your French is not up to it, just use Chrome browser and click to translate it.

regs

Richard]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136395#Comment_136395 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=8681&Focus=136395#Comment_136395 Thu, 23 Feb 2012 09:14:16 +0000 SteamyTea Off to get second fan soon.]]>