The current system is good for stabilising the cellar temperature during the summer (diurnal range is less than a degree or two) but the water tanks arent evaporating/cooling enough during extended warm spells to keep the cellar temp down low enough.
So Im going to change from an open water mass system, to a chilled closed loop one.
This lot will still run on the 25kWp of PV panels I have. Hopefully over extended periods the cellar temp can be kept a few extra degrees below ambient.
Always fun to experiment 🙂
Red is outside diurnal range throughout the summer, blue is inside the cellar diurnal range:
Similar data, but here you can see how the cellar temp rises during the summer above 20degrees at times (red/blue lines). Orange band is outdoor diurnal range.
Old system
Will connect the closed loop system to the pipes in the cellar