Quote:
Originally Posted by pinballlooking
How efficient do you think this would be?
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Should work well and I'm not convinced that the fan will be needed.
Will you mount the rad horizontally or vertically? I suggest you mount it almost horizontally - but with enough slope that you can easily bleed all air out of it. That will promote more air flow through the rad than a vertical arrangement, since any air flow in your greenhouse will be vertical.
I think your water flow rate is more important than using the fan. If you have a reasonable flow rate - it doesn't have to be a torrent - you should harvest significant heat even without the fan. You don't need a huge temperature rise on each pass through the rad, you just need a constant flow and some temperature rise.