[Malvern] FW: [mlvrnfreecycle] Offered - Glass tubing

[Ian Pascoe]

Hi Chris

I think I'll give this guy a call and see what these tubes can do.

Ian

PS Those of you not on Freecycle missed the opportunity to get a chimney
stack this week together with a revolving cowl!

Ian

-----Original Message-----
Subject: Re: [mlvrnfreecycle] Offered - Glass tubing


Hi Ian,

These tubes are like a thermos flask, in fact two tubes with a vacuum
between.  The broken ones have no vacuum.  The upside is that the inner tube
has a high tech selective coating which absorbs sunlight but radiates very
little energy (>93%, <7%).  You could use an inner tube alone, with water
running through it, or slide an outer tube over to act as double glazing.
You would have to figure out a way to cut the end off to create a tube,
probably by scoring.  You could make manifolds for the ends by cutting
suitable sized holes in waterproof containers and sealing with silicone.
Call me on xxxxx xxxxxx during office hours and we can arrange a time for
you to come and have a look.  There is a map of my office location in Upton
upon Severn at eco-nomical.co.uk.

On the other hand, a brand new tube with heat pipe is only £15 + VAT, which
might prove more successful and would certainly be easier.  You would have
to orient your trough between 15 degrees and vertical though.  The heat pipe
avoids having water in the tube, and thereby reduces sealing issues.

Kind regards

Simon Watts



----- Original Message -----
Subject: RE: [mlvrnfreecycle] Offered - Glass tubing


> Hi
>
> Not sure if these tubes will suffice but I am in the process of
> constructing
> a solar trough for the purposes of experimentation.  Originally I was
> going
> to use a copper tube of about 12 mm diameter, with water runing through
> it -
> do you thing these tubes would be up to it?
>
> How would you be able to "seal" the tube ends etc
>
> Ian
>
> -----Original Message-----
> From: malvernhillsfreecycle at yahoogroups.com
> [mailto:malvernhillsfreecycle at yahoogroups.com]On Behalf Of sgw100559
> Sent: 12 September 2006 19:14
> To: malvernhillsfreecycle at yahoogroups.com
> Subject: [mlvrnfreecycle] Offered - Glass tubing
>
>
> I have a quantity of borosilicate (pyrex) glass tubing, 58mm & 47mm
> diameter, 1.5mm thick.  They are from evacuated tube solar panels I
> import, and I get a regular supply of broken ones!  They might be
> suitable for hobby or art use.  Lengths up to 1800mm, most have sharp
> ends!  It seems a shame to break them up and throw them for landfill.
>
>
>
>
>
>
>
>
> Please use the following *subject line* format when posting messages:
> OFFER: Piano (Great Malvern)
> WANTED: Paving slabs (Ledbury)
> TAKEN: Swingball (Cradley)
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