[Stoves] Black radiating surfaces

[andrew]

On Sunday 25 May 2008 12:47:39 andrew wrote:
> I can see this will be unduly complicated but a closed circuit
> Thermosyphon  could take heat from the insulated boiler at as low
> as 50C and pass it down an insulated pipe to under the floor to,
> say, a buried car radiator over which people are seated and then
> back to the boiler. It would need large bore pipes and F&E tank
> though. I'm assuming no power for pumping being available.

I was thinking ahead of my typing, the caveat being that the boiler 
has to be below the seating position.

We have some old kitchen gardens on some old Victorian country houses 
in UK, typically about 1/4 acre (0.1ha) surrounded by a 8' (2.4m) 
plus high brick wall with raised beds covered by sloping glass 
panels and a greenhouse set lean-to on the northern wall, to catch 
the maximum sunlight. Often there will have been be a coal fired 
boiler set below ground level under the green house to provide 
hydronic heating for it and the beds. From what I have seen the 
pipes were >3" (>75mm) diameter.

AJH