raytaylor: Right now, I have a the heat transfer fan in the halfway end, and a 12v computer case fan at the other end so i am trying to offset the heat absorption with air speed. but i think that springy pipe slows it down alot.
I think if i replace the pipe with smooth PVC, and wrap it in pink batts, with large cable ties around the batts then it should work?
I have seen that the foam around our hot water piping is held on with fancy electrical looking tape, but a super long cable ties should be more permanent.
I have never purchased pink batts before but i would be looking at getting the oblong sheets?
We had the sheeps wool stuff blown in our attic a couple of years ago which is supposedly better than pink bats but i cant coat a pipe with it. But i see in new houses they have cut pink (yellow?) batts to fit into the rafters so I would use that
Purpose made heat transfer duct is spiral wound with a metallic finish surrounded with polyester insulation about 2cm thick. The outer plastic covering needs to be airtight end to end because the inner duct has tiny holes in it that allows the entire duct to pressurise, maintaining an insulating air barrier as well as the polyester insulation which seems to be there just to maintain the inner pipes central position. I believe that the majority of the insulating is the air barrier, just like a double glazed window.
If your heat transfer system does not have this double layer insulated duct, get some. Regular single layer spiral duct is for expelling smells and water vapour from kitchens and bathrooms, not for heat transfer. I scored tens of meters of the stuff from the dumpster outside a ventilation place, I guess they cannot be bothered with joining shorter lengths.
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