Electronics > Power/Renewable Energy/EV's

Ridiculous 'blue sky' ideas

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coppice:

--- Quote from: hayatepilot on March 21, 2016, 06:55:00 am ---daveatol's calculation is correct.

--- Quote from: HAL-42b on February 19, 2016, 01:18:02 pm ---So we need to generate  0.78kWh/m2 * 10 floors / 24 hours  = 325W / m2 roof area

So we have 0.325 = Flow * 35m * 9.8n/s2
Flow = 0.94 liters/second
= 56.4 liters/hour
= 1353.6 liters/day

We only have 60% efficiency so better make this 2250 liters/day for every m2 of roof area.
--- End quote ---

You forgot the minutes in your calculation:  ;)
Flow = 0.94 liters/second
= 56.4 liter/minute
= 3384 liters/hour
= 81216 liters/day

This would equal a pillar of water 81m high above the building!
Absolutely unpractical.

--- End quote ---
I ran some numbers recently for how big a pair of pools it would take at the top and bottom of a local hill, to store enough from rooftop PV in the day, to meet the overnight needs of just our house. Its an awful lot of water. Even if you live at the top of a really big cliff the pools need to be huge by domestic construction standards.