I am in process of building my greenhouse using a "hybrid" climate battery. A combination of many ideas
Paradise
Am in zone 7a in Maryland with 55 deg average temp, 59% sun and a 47" average rainfall.
Greenhouse is ~160 square feet with insulated walls on the north, east and west with a half wall on the south. The glazing is Solex.
They say the amount of underground tubing (4" perf drain tile) should be 10% 0f the total cu ft if directly under the greenhouse, or 25% if outside of the greenhouse. This is according to
https://www.youtube.com/user/LDSPrepper/featured
It would seem to me (perhaps in my ignorance) that these climate batteries would, like all batteries, need to be recharged from time to time. This could be done on a daily basis by using the heat at the peak of the greenhouse being pumped into the ground tubes, the use of a compost heating system, solar heating tubes, RMH, water storage for mass. use of aquaponic water for mass etc.
The climate battery will be a portion of my overall system to be modified as need be, but only a part of the whole.
The experiment continues...
