CalculatorForLocalCarbon-Rev4
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Calculating CO2e Impacts in the Local Carbon Network project
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Using Combined Heat, Power and Carbon (CHPc-) equipment from All Power Labs
ENTER VALUES ONLY IN YELLOW BOXES
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This calculator relates a unit of green-waste biomass input to various power and product output amounts. Conversion results are provided in absolute output quantities,
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carbon emissions in CO2e equivalents (positive or negative), and simple economic values for each product stream.
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All conversion rates and values are user defined, using the the yellow entry cells in blocks at bottom of page. Links to reference literature and conversion standards
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are provided where possible. All entered values are of course open for interpretation, with their final accuracy dependent on specific context and use scenario. The goal
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is for the calculation framework to be mature, with debates and variable outcomes open for exploration via different entered values.
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In contrast with previous APL calculators (which relate all flows to the core metric of kWh electricity generated) this calculator is organized around the core metric of
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green-waste biomass input kg to the project. All other project flows and outcomes are related to this core metric to enable comparison and integrated calculation.
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Calculating "All-in" Impact Ratios per unit green-waste input
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1.0
kg biomass green-waste produces:
CO2e Impacts by Type (in kg)Value of Power and Products separate of CO2e Impacts
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2.2lbsOffsetAvoidedCapturedSequestered$ ValueEnter ratetypical range
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1.0kWhElectricity grid0.500$0.20$0.20/kWh electric$0.15-0.30/kWh
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off-grid diesel0.880$0.40$0.40/kWh elecric$0.30-0.60/kWh
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2.0kW thHeat via CHP grid natural gas 0.200$0.068$0.034/kWh thermal$10.00/1000cuft
$4-15/1000cuft ~ 1,000,000 BTU
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6,824BTUheating fuel0.270$0.195$0.098/kWh thermal$4.00/gal
$2-5/gal diesel or kero ~ 140,000 BTU
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0.05kgBiochar to soil0.184
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Biochar yield rate from raw biomass=5%
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Increased Plant Productivity0.459
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Growth acceleration from biochar =25%
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Reduced GHG emissions from soil (CH4, NO2)
0.050
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Emission reduction from biochar =x%
Financials are more difficult to define for these contributions. For now left blank.
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Water Reduction / Conservation0.046
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Water reduction from biochar =x%
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Land Restoration, Reforestation, New landscaping
0.184
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New planting on unproductive land
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Other CO2e Impact Adders
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Prevention of biomass anaerobic decomposition
0.150
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Post engine CO2 capture and sequestration
0.000
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Misc adder #1
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Misc adder #2
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Total CO2e Impact (in kg)
1.7710.7460.2000.6420.184on-grid
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2.2211.1960.2000.6420.184off-grid
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Average of on-grid and off-grid total impact
2.00
(at entered biomass input amount)
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"All-in" Impact Ratio per unit green-waste input
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1kg Green-waste input produces2.00
kg CO2e Total Impact
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1kg Biochar represents39.93
kgCO2e Total Impact
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Quantity and Rate definitions for above calculations
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ENTER VALUES ONLY IN YELLOW BOXES
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Biomass to Electricity, Heat and Biochar conversion valuesPlant, Soil and Water conversion valuesother CO2e Impact adders
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Biomass to electricity, heat and biochar
Increased CO2 capture via plant productivity with biochar
Avoided CH4 emissions from biomass anaerobic decomposition
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Inputs
Pecentage increase in plant growth due to biochar addition*
25%
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Biomass feedstock in kg
(enter in chart)
CO2e kg per kg dry biomass**
1.835
Expressed as kg CO2e / kg green-waste input to project*
0.150
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(dry basis)
Net CO2e kg increase standing biomass per kg green-waste input
0.459
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Outputs*Explanatory note
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Electricity generated in kWh per kg dry biomass
1.0
* Biochar benefits plant productivity (thus CO2 capture) on existing growth/crops or new biomass
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Heat available via CHP( kWt/kWe)
2.0
enabled on previousliy unproductive soils. The net increase is expressed as percentage increase
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Biochar yield from raw biomass
5%
in standing biomass over base of biomass production rate in area without intervention. Biomass
Post engine CO2 capture & sequestration
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converted is already green-waste so not contributing to new biomass removal.
CO2 kg engine exhaust / kg dry biomass input
1.835
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Percentage of potential engaged
0%
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CO2 emissions offset values Electricity
** Biomass is ~ 50 carbon by dry mass. To convert C to CO2e, multiply by 3.67.
Net CO2e kg per kg green-waste input
0.0000
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Reference CO2 kg / kWh for grid electricity
0.520
Therefore each kg dry biomass =~ 3.67/2 or 1.835kg CO2e
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Reference CO2 kg / kWh for off-grid electricity
0.900
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CO2 kg / kWh loading for biomass powergen
0.020
Avoided soil/biomass GHG emissions (CH4, N2O)
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(Enter above values from chart to right or other source)
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Net CO2 kg / kWh offset with biomass powergen vs grid
0.500
Expressed as kg CO2e / kg biochar added to soil*
1.000
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Net CO2 kg / kWh offset with biomass powergen vs off-grid
0.880
*Explanatory note
Other avoidance, offset, capture or sequestration adder #2
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Emissions factor for scheme: CO2e kg / kg dry biomass input
-1.00
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Percentage of potential engaged
10%
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CO2 emissions offset values Heat
Net CO2e kg per kg green-waste input
-0.100
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CO2 kg / kWh thermal for natural gas
0.200
Water use reduction/conservation
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CO2 kg / kWh thermal for heating oil / diesel
0.270
Reduction in water use due to improved soil water holding capacity with biochar
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CO2 kg / kWh loading from electricity
0.520Other avoidance, offset, capture or sequestration adder #2
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(Enter above values from chart to right or other source)
kg CO2e of water / gal
0.001824
Emissions factor for scheme: CO2e kg / kg dry biomass input
-1.00
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Pecentage utilization of CHP avilable heat
50%
typical gal used / kg dry biomass grown
100.000
Percentage of potential engaged
10%
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Percentage water reduction with biochar application
25%
Net CO2e kg per kg green-waste input
-0.100
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Heat via biomass CHPC adds no extra CO2 post electricity prodution
Expressed as kg CO2e / kg green-waste input from site*
0.0456
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*Explanatory note
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other possibilities
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Reduced fertilizer use
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https://www.csu.edu/cerc/researchreports/documents/CarbonFootprintofWater-RiverNetwork-2009.pdf
Water use in powergen
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New CO2 capture via land restoration/reforestry/landscaping
100
Project created new biomass vs total green-waste engaged*
10%
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