Revision as of 19:47, 19 December 2018

Cement takes 5 MJ/kg - [1]
A 200kW panel produces 4300 MJ per day. [2]
(1 kHwr = 3.6 MJ)
Solar array can produce 860 kG of cement per day. That is 43kg. 20 sacks of portland cement per day. That is $10 per bag - or $200/day
The value of electricity only is $120 - so that is value added electricity right there.
With 200kW at $100k installed - that is 500 days to payback time.
Molecular weight of lime - CaCO3 - 40+12+48 = 100. MW of lime - CaO - is 56% of the original. So about half gone.

Conclusion

The open source microfactory with 200kW solar power yields about 20 sacks of cement per day starting from limestone. Cost of delivered gravel is $10/ton.
Cost per day in lime - $20. 10% costs of materials.

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 *The value of electricity only is $120 - so that is value added electricity right there.
 *With 200kW at $100k installed - that is 500 days to payback time.
+*Molecular weight of lime - CaCO3 - 40+12+48 = 100. MW of lime - CaO - is 56% of the original. So about half gone.
+=Conclusion=
+*The open source microfactory with 200kW solar power yields about 20 sacks of cement per day starting from limestone. Cost of delivered gravel is $10/ton.
+*Cost per day in lime - $20. 10% costs of materials.