Mike Phillipps wrote:I'm reading this book at the moment:
Mike Phillipps wrote:Mike J,
Blowing air between 2 layers of poly film probably reduces it from R-2 to near R-1.
Mike Jay wrote:
My hunch is that a 200' run of 3/4" black irrigation pipe would also heat up a circulating fluid fairly efficiently.
Mike Jay wrote:
If you're blowing air across the device, a radiator would be much much more effective than a bunch of pipe.
If you're also collecting direct solar radiation gain, the large surface area of the pipe exposed to the sun may make it much more effective.
I suspect that if I need to heat the greenhouse air from the thermal mass I'd try a radiator and fan.
You're right, if the compost works at the upper range of the numbers I listed, I shouldn't need any thermal storage. Here's to hoping for that outcome
Mike Jay wrote:Hmm, I think we need input from someone who's done the blower trick. I think the blower only fills up the air gap. Once the proper pressure has been reached a check valve holds the air in and there's no air movement. If you don't have the check valve type and the blower blows the whole time it still wouldn't be going anywhere (just building/holding pressure) so I don't think it would be like a blower under your parka. Maybe like a blower in your parka if you have a bungee cord holding the parka tight around your waist, wrists and neck to trap the air...
Anderson gave himself the promotion. So I gave myself this tiny ad:
Permaculture Playing Cards by Paul Wheaton and Alexander Ojedahttps://permies.com/wiki/57503/Permaculture-Playing-Cards-Paul-Wheaton