Subterranean Heating Cooling System

Hi there,

Looking to size a climate battery / SHCS (subterranean heating and cooling system) but noticed that the calculator from Sunny John has gone missing (numsum no longer exists).

Does anyone have a copy? Or another sizing tool?

Thanks!

I wont profess to know anything about what you are doing but I did find your calculator http://archive.org works good sometimes.

https://web.archive.org/web/20120103180312/http://numsum.com/spreadsheet/show_plain/4681

I would think you could copy and paste that info into a spreadsheet from http://openoffice.org

That's awesome! Thanks! I'm so happy to find this - I thought it was lost to the world

This appears to be a more up to date site that has this calculator: http://www.ecosystems-design.com/climate-battery-calculator.html

Kevin Swanson wrote:This appears to be a more up to date site that has this calculator: http://www.ecosystems-design.com/climate-battery-calculator.html

Thank you Kevin so much for this! I plan to use it to build a geo-air-thermal greenhouse. But the look will be much better. This is what I plan to use:

Very cool looking, but I am concerned about its structural integrity. It gets 100% of its strength from the end walls, and depends on the lateral stiffness of the long facets to keep from collapsing in the middle. I think the original building the concept came from supports the roof facets at many internal points, so that it does not need to span much aside from the overhanging end.

If the greenhouse profile is a catenary arch, it would not have internal stresses, but a snow load would change that; you can't have it be stable both with and without snow. The vertical back wall would need to be braced to the ground to support the thrust if it does use any arch design.

Glenn Herbert wrote:Very cool looking, but I am concerned about its structural integrity. It gets 100% of its strength from the end walls, and depends on the lateral stiffness of the long facets to keep from collapsing in the middle. I think the original building the concept came from supports the roof facets at many internal points, so that it does not need to span much aside from the overhanging end.

If the greenhouse profile is a catenary arch, it would not have internal stresses, but a snow load would change that; you can't have it be stable both with and without snow. The vertical back wall would need to be braced to the ground to support the thrust if it does use any arch design.

Glenn, good point and I have thought about it for quite a while. I plan to solve it two ways. (1) Use two batches of long and continued PVC tubes from end to end in two directions with holes drilled to accommodate the sectioned pieces in the remaining direction. (2) Build internal supports inside as I need some internal structure to hang my vertical grow towers anyway.