Solar Cement: Difference between revisions
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*The value of electricity only is $120 - so that is value added electricity right there. | *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. | *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. [https://en.wikipedia.org/wiki/Lime_(material)] | |||
=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. | |||
[[Category: Solar Cement]] | |||
Latest revision as of 04:46, 6 September 2022
- 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. [3]
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.