Mon, 25 May 2026 21:24:20 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=5701#Comment_5701 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=5701#Comment_5701 Wed, 15 Aug 2007 12:56:16 +0100 fostertom http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=538&page=1#Item_9

Posted By: biffvernonnegative U-value, i.e. they gain more heat than they lose

Indeed - the principle can be applied to whole walls, slight internal vacuum drawing air through the pores of the wall and bringing all the escaping heat back in with it.

Here's the reference I was looking for: http://www.forevergreen.org.uk/articles/articlesthebreat.html - the bit about Dynamic Insulation.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=5718#Comment_5718 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=5718#Comment_5718 Wed, 15 Aug 2007 14:43:51 +0100 tony https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=5736#Comment_5736 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=5736#Comment_5736 Wed, 15 Aug 2007 20:38:11 +0100 biffvernon https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=35188#Comment_35188 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=35188#Comment_35188 Sun, 12 Oct 2008 15:05:14 +0100 Mike George http://www.housebuildersupdate.co.uk/labels/Insulation.html Some good links to a system being developed. Anyone have an opinion?]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=35191#Comment_35191 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=35191#Comment_35191 Sun, 12 Oct 2008 15:21:05 +0100 tony
This system has no hope -- living in a collander is never going to be thermally efficient.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=35196#Comment_35196 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=35196#Comment_35196 Sun, 12 Oct 2008 17:39:31 +0100 joe.e And am I right in thinking that the relative flow rates are the wrong way round for good efficiency in the heat exchanger? If it's drawing in a lot less air than it's expelling, it won't be as efficient at getting the heat out of the departing air - is that right?]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=35199#Comment_35199 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=35199#Comment_35199 Sun, 12 Oct 2008 17:53:28 +0100 fostertom https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=35201#Comment_35201 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=35201#Comment_35201 Sun, 12 Oct 2008 18:03:44 +0100 caliwag
" target="_self" rel="nofollow">http://web.mac.com/markbrinkley/Mark_Brinkley.net/Home.html]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=35202#Comment_35202 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=35202#Comment_35202 Sun, 12 Oct 2008 18:05:02 +0100 caliwag
http://web.mac.com/markbrinkley/Mark_Brinkley.net/Home.html]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=35206#Comment_35206 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=35206#Comment_35206 Sun, 12 Oct 2008 18:18:55 +0100 Mike George http://www.environmental-building.co.uk/dbb.shtml#energy.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=35207#Comment_35207 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=35207#Comment_35207 Sun, 12 Oct 2008 18:34:44 +0100 Ed Davies https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=35217#Comment_35217 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=35217#Comment_35217 Sun, 12 Oct 2008 20:04:13 +0100 Mike George http://www.environmental-building.co.uk/documents/4578PS1i1_web.pdf

" Dynamic insulation
6.6 It should be noted that ventilation air drawn through the dynamic cells will recover some of the heat which would
otherwise be lost by conduction(1).
(1) At the time of issue of this Certificate, a formal codified method for quantifying or using ‘dynamic U-values’ is not available, but the Certificate
holder is currently undergoing such an assessment, in accordance with SAP 2005, Appendix Q, to enable this mechanism of heat recovery to
be formalised and used in heat-loss calculations."

'Some of the heat' being the interesting part]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=35220#Comment_35220 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=35220#Comment_35220 Sun, 12 Oct 2008 20:12:25 +0100 fostertom https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=35230#Comment_35230 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=35230#Comment_35230 Sun, 12 Oct 2008 22:03:25 +0100 Mike George https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=35261#Comment_35261 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=35261#Comment_35261 Mon, 13 Oct 2008 11:33:42 +0100 sinnerboy
this is amusing - from the BBA cert

"8 Behaviour in relation to fire
8.1 The product is classified as ‘combustible’.
8.2 When installed, the product will be contained by a suitable lining (eg 12.5 mm thick, Type F plasterboard), with
all joints fully sealed and supported by timber rafters/studs/joists. Therefore, it will not contribute to the development
stages of a fire or present a smoke or toxic hazard until the lining is compromised.
8.3 The use of the products in pitched roofs will not affect the external fire rating of a slated or tiled roof when
evaluated by assessment or test to BS 476-3 : 2004. The products must not be carried over junctions between those
roofs and walls required to provide a minimum period of fire resistance."

The single lining in item 8.2 will be punctured by elec points and vent openings . An outbreak of fire will quickly spread to the wall cavity causing flashover temperatures to be reached all over the house . Don't look to intumescents to provide an answer - they act too slowly to solve this problem

http://uk.youtube.com/watch?v=jQV_MJwYQ3k&feature=related

http://uk.youtube.com/watch?v=TKPfkrGDv7U]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=35268#Comment_35268 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=564&Focus=35268#Comment_35268 Mon, 13 Oct 2008 13:13:24 +0100 fostertom