Navitron Renewable Energy and Sustainability Forum

Green Building and Design => Energy Efficiency & Insulation => Topic started by: breadandbuttertome on May 02, 2019, 04:51:21 PM



Title: Passive solar collector
Post by: breadandbuttertome on May 02, 2019, 04:51:21 PM
Hi; I have a south-east facing gable end built with 1960's porous bricks. A couple of times a year I get water ingress into the (insulated) cavity. I've checked the verge, the pointing and the window surround mastic and they seem OK. I waterproofed (silicone) the outside which only worked for a year.

Rendering would probably sort it, and I am currently thinking of cladding it (timber is trendy), but it is an opportunity to do something innovative with passive solar collectors (Or even PV, if I could prevent the reflection dazzling the neighbours). It's about 12sq.m., and is in the sun from dawn until 3pm. A few years ago I visited a terraced house refurb showhouse in Sheffield which had a shallow glazed cladding passive collector attached to a 9" solid (no cavity) wall.

Anybody have any thoughts? I'm willing to DIY but will need scaffolding. Will I need Planning Permission?



Title: Re: Passive solar collector
Post by: Iain on May 02, 2019, 08:12:38 PM
Hi

Quote
.Hi; I have a south-east facing gable end built with 1960's porous bricks. A couple of times a year I get water ingress into the (insulated) cavity. 

Have you thought of External Wall Insulation and render system.
The gable end on my house needed rerendering. In the end I went with EWI with a 3 coat reinforced coating system on top. Fantastic difference.
That would sort out the water ingress, and provide a vast improvement on the insulation.
fixings could be added during installation if you did go down the PV or solar thermal panel route as well.

Iain


Title: Re: Passive solar collector
Post by: billi on May 02, 2019, 09:39:42 PM
Well ,  if its a cavity insulated brick wall , i guess you hardly need more insulation on those 12 m2  bricks , if its nice terracotta bricks,  i would place a glass panel in a 2-4 inch distance to the wall and   a ventilation idea to pump the hot air into the house ( but that depends on the heating demand  in winter and needs perhaps cooling in summer -reverse flow ?)

But its hard to say  , when not knowing the look of it , sure some types  of timber cladding can uplift the style of the house a lot

Billi






Title: Re: Passive solar collector
Post by: breadandbuttertome on June 08, 2019, 10:47:20 AM
Thanks for your help; I'm still researching. I have a relative with external insulation but am looking for solar gain from outside if possible (here we are, nearly at the summer solstice and a cheery 10 degrees outside in this bit of Derbyshire}. A non-insulating cladding with stand-off fixings and a fan and ducting controlled by temperature sensors would work, and I could maybe couple it to the ASHP inlet.  It'll have to be vermin proof - I am hosting two Jackdaw families under the solar PV panels, they are quite amusing and keep me in twigs for fire-starting but they litter the place up something shocking.


Title: Re: Passive solar collector
Post by: kristen on June 08, 2019, 11:24:13 AM
if its a cavity insulated brick wall , i guess you hardly need more insulation on those 12 m2  bricks

I'm surprised you think that. I have cavity (filled) and brick and I would love to wrap the outside in insulation. Not done the u-value sums (but I know it is sufficiently expensive that I won't be doing it ... yet), but isn't wrapping regarded as an ideal when improving insulation of a building? (compared to insulating the inside of the eternal walls)


Title: Re: Passive solar collector
Post by: Warble on June 08, 2019, 03:05:32 PM
A Trombe wall is not a new idea. Normally it consists of a glass screen in front of a solid wall. I think you would need planning permission for it.


Title: Re: Passive solar collector
Post by: billi on June 08, 2019, 05:40:19 PM
Quote
I'm surprised you think that
, well Kristen ,  the following up  of my words where to place a glass panel over the brick wall and built a  solar air collector  or maybe go for timber cladding 

12 m2 of  solar air collector can do a lot  for warming up a old house and dry it out too , i would expect the heat  benefit of that , would be greater  than  insulate and render it

Regards Billi


Title: Re: Passive solar collector
Post by: todthedog on June 09, 2019, 06:18:07 AM
We had a piece of kit called solarventi a solar powered de humidification system. a metal frame with a plastic face a thermostatic computer fan pushing solar warmed air into the house. Imagine a big tv for size. The idea being that the warmed air would displace the damp air inside the house. I can see it working well in cold alpine conditions sun and clear skies, not a success for us in Finisterre. It worked well enough in summer (not needed the door was open much of the time) a complete waste of time in winter damp grey skies and not sunny.  It might work for a shed or boat but the panel would need to be wall sized to be effective on a house if then.

It is the only bit of renewable energy kit we installed that I consider a waste of money.