1. Select the portion of your fleet, on which you plan to implement clean diesel technologies.

Green School District
Total fleet: 100 vehicles
25 1989 Cummins@350 bhp = A
50 1996 Caterpillar@250 bhp = B
25 2000 Volvo@200 bhp= C

2. Baseline Emissions

• Determine the baseline particulate matter and hydrocarbon emissions for the selected vehicles in tons/yr. The baseline is the total emissions calculated prior to retrofit modifications.
• The below referenced certification numbers are taken from the EPA Retrofit Calculator.
  

PM = particulate matter
HC = hydrocarbons
G/bhp h= grams/brake horsepower hour
Selected diesel engines operate 250 days/yr*6h/day

(A) 0.43 g/bhp h PM, 0.43 g/bhp h HC
(B) 0.08 g/bhp h PM, 0.50 g/bhp h HC
(C) 0.32 g/bhp h PM, 0.48 g/bhp h HC

A = 0.43 g/bhp h PM*350 bhp=150.5 g/h PM
150.5 g/h* 1kg/1000g*2.2lb/1kg*1ton/2000lb*1500h/yr*25=6.19 tons/yr PM

B = 0.08 g/bhp h PM*250 bhp=20.0 g/h PM
20.0 g/h*1kg/1000g*2.2lb/1kg*1ton/2000lb*1500h/yr*50=1.65 tons/yr PM

C = 0.32 g/bhp h PM*200 bhp=64.0 g/h PM
64.0 g/h*1kg/1000g*2.2lb/1kg*1ton/2000lb*1500h/yr*25=2.64 tons/yr PM

TOTAL baseline PM emissions: 6.19+1.65+2.64= 10.48 tons/yr PM

A = 0.43 g/bhp h HC*350 bhp=150.5 g/h HC
150.5 g/h* 1kg/1000g*2.2lb/1kg*1ton/2000lb*1500h/yr*25=6.19 tons/yr HC

B = 0.50 g/bhp h HC*250 bhp=125.0 g/h HC
125.0 g/h*1kg/1000g*2.2lb/1kg*1ton/2000lb*1500h/yr*50=10.31 tons/yr HC

C = 0.48 g/bhp h HC*200 bhp=96.0 g/h HC
96.0 g/h*1kg/1000g* 2.2lb/1kg*1ton/2000lb*1500h/yr*25=3.96 tons/yr HC

TOTAL baseline HC emissions: 6.19+10.31+3.96= 20.46 tons/yr HC

3. Post-modification Emissions

• Determine the particulate matter and hydrocarbon emissions with the implementation of clean diesel technologies for the selected vehicles in tons/yr.
• The below referenced percentages are averages taken from reductions caused by specific types of products found on the EPA Verification website.

(A) ultra low sulfur diesel
(B) oxidation catalysts and ultra low sulfur diesel
(C) particulate filters and ultra low sulfur diesel

(A) 20% PM, 50% HC
(B) 35% PM, 60% HC
(C) 90% PM, 95% HC

A = 6.19 tons/yr PM- 1.24 tons/yr PM= 4.95 tons/yr PM
B = 1.65 tons/yr PM- 0.58 tons/yr PM= 1.07 tons/yr PM
C = 2.64 tons/yr PM- 2.38 tons/yr PM= 0.26 tons/yr PM

TOTAL PM emissions: 6.28 tons/yr PM

A = 6.19 tons/yr HC- 3.10 tons/yr HC= 3.09 tons/yr HC
B = 10.31 tons/yr HC- 6.19 tons/yr HC= 4.12 tons/yr HC
C =3.96 tons/yr HC- 3.56 tons/yr HC= 0.4 tons/yr HC

TOTAL HC emissions: 7.61 tons/yr HC

4. Percent Emission Reductions

• Calculate the percent difference between the baseline and post-modification particulate matter and hydrocarbon emissions.
  

[10.48 tons/yr PM + 20.46 tons/yr HC] - [6.28 tons/yr PM + 7.61 tons/yr HC]/
[10.48 tons/yr PM + 20.46 tons/yr HC]* 100=55.1% reduction=platinum!