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Energy Ref

Example Model:  Ethanol Production

Step #1:  Corn Farm
Inputs
constraints
Land
3.08
acres
Deisel Fuel
3.69
gallons
Electricity
62
kilowatt-hours
Fertilizer
0.21
tons
Water
21,538
gallons
CO2
9,333
pounds
Corn Farm
Outputs
constraints
Corn
400
bushels
O2
6,222
pounds
Step #2:  Ethanol Factory
Inputs
constraints
Corn
400
bushels
Natural Gas
28,000
cubic feet
Electricity
55
kilowatt-hours
Water
18
gallons
Ethanol Factory
Outputs
constraints
Ethanol
1,000
gallons
DDS
1,000
gallons
CO2
3,360
pounds
Balance Sheet - Financial
Step #1:  Corn Farm
Inputs
Land
  --  
Deisel Fuel
@ $3.00/gal
$11.08
Electricity
@ $0.15/kWhr
$9.23
Fertilizer
@ $2,000.00/ton
$410.26
Water
@ $0.01/gal
$215.38
CO2
  --  
 
Total
$645.95
Outputs
Corn
@ $2.75/bushel
$1,100.00
O2
  --  
 
Total
$1,100.00
Step #2:  Ethanol Factory
Inputs
Corn
@ $2.75/bushel
$1,100.00
Natural Gas
@ $0.012/ft3
$336.00
Electricity
@ $0.15/kWhr
$8.31
Water
@ $0.01/gal
$0.18
 
Total
$1,444.49
Outputs
Ethanol
@ $1.20/gal
$1,200.00
DDS
@ $0.20/gal
$200.00
CO2
  --  
 
Total
$1,400.00
Balance Sheet - Mass
Step #1:  Corn Farm
Inputs
Land
  --  
Deisel Fuel
@ 5 lbs/gal
18 lbs
Electricity
  --  
Fertilizer
410 lbs
Water
@ 8.33 lbs/gal
179,415 lbs
CO2
9,333 lbs
 
Total
189,177 lbs
Outputs
Corn
@ 56 lbs/bushel
22,400 lbs
O2
6,222 lbs
 
Total
28,622 lbs
Step #2:  Ethanol Factory
Inputs
Corn
@ 56 lbs/bushel
22,400 lbs
Natural Gas
@ 0.001 lbs/ft3
28 lbs
Electricity
  --  
Water
@ 8.33 lbs/gal
154 lbs
 
Total
22,582 lbs
Outputs
Ethanol
@ 5 lbs/gal
5,000 lbs
DDS
@ 6 lbs/gal
6,000 lbs
CO2
3,360 lbs
 
Total
14,360 lbs
Balance Sheet - Energy
Step #1:  Corn Farm
Inputs
Land
  --  
Deisel Fuel
@ 139,000 BTU/gal
513,231 BTU
Electricity
@ 3,414 BTU/kWhr
210,092 BTU
Fertilizer
  --  
Water
  --  
CO2
  --  
 
Total
723,323 BTU
Outputs
Corn
@ 8,500 BTU/bushel
3,400,000 BTU
O2
  --  
 
Total
3,400,000 BTU
Step #2:  Ethanol Factory
Inputs
Corn
@ 8,500 BTU/bushel
3,400,000 BTU
Natural Gas
@ 1,027 BTU/ft3
28,756,000 BTU
Electricity
@ 3,414 BTU/kWhr
189,083 BTU
Water
  --  
 
Total
32,345,083 BTU
Outputs
Ethanol
@ 75,700 BTU/gal
75,700,000 BTU
DDS
@ 5 BTU/gal
5,000 BTU
CO2
  --  
 
Total
75,705,000 BTU