It was OK but I was asking too much of it. I think the bearings just
got knacked from all the backpressure. If they weren't already shot,
it would be burbling away happily now that I've split the coil into 4
I'm not sure... maybe with the polythene on. It's just that when I
first measured it, I got 5 litres in 35 seconds with 7degrees rise.
When I split the coil into 4 circuits, I got the same temp rise but
with 5 litres in only 15 seconds. Admittedly the first measurements
were taken in less good conditions but I reckon that the black pipe
will only work efficiently up to a certain temperature - ie: not much
above ambient. So perhaps when I get my slower pump, I won't be seeing
10kw any more (although probably getting a better efficiency in terms
of electricity used / heat output).
I'll try the polythene at the weekend and post the before/after
This is effectively increasing the collector size so I would imagine I
would get a large improvement.
I should imagine you'd definately need much better insulation
underneath, say polystyrene and maybe polycarbonate sheets over the
top (3m x 0.6m sheets can be had for about a tenner). I don't even
know if you'd be able to get DHW temperatures with MDPE pipe though.
I just bought 50m x 10mm copper oil pipe for about 60 quid (not for a
solar project!). You could use this on a black corrugated metal
collector surface - it could be well spaced out due to the high
conductance of metal.
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