That’s funny, I was just reading this article last night- https://www.lowtechmagazine.com/2015/12/reinventing-the-greenhouse.html
Looks like the cover is automated now, and has gone from straw to synthetic so it doesn’t get heavier when it’s wet.
A couple interesting quotes-
“The correlation between inside temperature and sunlight is almost four times greater than the correlation between inside temperature and outside temperature.”
It seems the wofati should negate that with an earth mass instead of just a thick rear wall.
“From the sixteenth to the twentieth century, urban farmers grew Mediterranean fruits and vegetables as far north as England and the Netherlands, using only renewable energy. These crops were grown surrounded by massive "fruit walls", which stored the heat from the sun and released it at night, creating a microclimate that could increase the temperature by more than 10°C (18°F).
Later, greenhouses built against the fruit walls further improved yields from solar energy alone. It was only at the very end of the nineteenth century that the greenhouse turned into a fully glazed and artificially heated building where heat is lost almost instantaneously -- the complete opposite of the technology it evolved from.“ Ironic huh??
So here we are with this wofati project, coming full circle to the past!
Lowtechmagazine is a great website to explore, by the way!