Solar Cement

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  • 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.