Table 5 Summary of Results from NREL Hybrid and Natural Gas Bus Evaluations
Table 5 Summary of Results from NREL Hybrid and Natural Gas Bus Evaluations
| Unit | DART 6/98 - 1/00 40-ft LNG 40-ft Diesel |
WMATA 9/01 - 9/04 40-ft CNG 40-ft Diesel |
KC METRO 4/05 - 3/06 60-ft Diesel Hybrid 60-ft Diesel |
NYCT 10/04 - 8/05 40-ft Diesel Hybrid 40-ft CNG |
|
|---|---|---|---|---|---|
| Capital ($ mill) | |||||
| Diesel Fuel Station | total | not reported | not reported | not reported | not reported |
| NG Fuel Station | total | $ 7.50 | $ 4.00 | NA | $ 7.40 |
| Hybrid Depot Modifications | total | NA | NA | None | $0.14/depot - 2 battery conditioners |
| NG Depot Modifications | total | incl in NG fuel station | $ 11.60 | NA | not reported |
| Hybrid Bus Purchase | ea | NA | NA | $ 0.645 | not reported |
| NG Bus Purchase | ea | not reported | $ 0.34 | NA | not reported |
| Fuel Economy | |||||
| Duty Cycle | MPH | 13.7 - 14.4 | 11.6 | 11.6 - 12.4 | 6.2 - 6.5 |
| Hybrid Fuel Economy | MPG | NA | NA | 3.17 | 3.2 |
| NG Fuel Economy | MPDEG | 2.70 | 2.32 - 2.39 | NA | 1.7 |
| Diesel Fuel Economy | MPG | 3.80 | 2.84 | 2.50 | 2.30 - 2.40 |
| Fuel Cost | |||||
| NG Cost | $/DEG | $ 0.82 | $ 1.50 | NA | $ 1.74 |
| Diesel Cost | $/gal | $ 0.90 | $ 1.33 | $ 1.98 | $ 1.78 |
| Unit | DART 6/98 - 1/00 40-ft LNG 40-ft Diesel |
WMATA 9/01 - 9/04 40-ft CNG 40-ft Diesel |
KC METRO 4/05 - 3/06 60-ft Diesel Hybrid 60-ft Diesel |
NYCT 10/04 - 8/05 40-ft Diesel Hybrid 40-ft CNG |
|||||
|---|---|---|---|---|---|---|---|---|---|
| Maintenance Cost | LNG | Diesel | CNG | Diesel | Hybrid | Diesel | Hybrid | CNG | |
| PMI | $/mi | $ 0.07 | $ 0.07 | $0.12-$0.14 | $ 0.17 | $ 0.05 | $ 0.05 | $ 0.17 | $ 0.12 |
| Powerplant | $/mi | $ 0.08 | $ 0.06 | $0.11-$0.12 | $ 0.11 | $ 0.11 | $ 0.12 | $ 0.17 | $ 0.25 |
| Drive System | $/mi | $ 0.02 | $ 0.01 | $0.01-$0.03 | $ 0.04 | $ 0.01 | $ - | $ 0.18 | $ 0.04 |
| Fuel System | $/mi | $ 0.01 | $ 0.01 | $0.01-$0.02 | $ 0.01 | $ 0.01 | $ - | $ 0.02 | $ 0.06 |
| TOTAL PROPULSION | $/mi | $ 0.11 | $ 0.08 | $0.13-$0.17 | $ 0.16 | $ 0.13 | $ 0.12 | $ 0.37 | $ 0.35 |
| NON-PROPULSION | $/mi | $ 0.29 | $ 0.45 | $0.39-$0.41 | $ 0.43 | $ 0.31 | $ 0.34 | $ 0.86 | $ 0.94 |
| TOTAL | $/mi | $ 0.40 | $ 0.53 | $0.52-$0.58 | $ 0.59 | $ 0.44 | $ 0.46 | $ 1.23 | $ 1.29 |
NOTES
DART: Capital
costs are for two LNG fuel stations and modifications at two depots
Warranty costs not included
WMATA: CNG cost
includes $0.14/DEG for compression (electricity) and $0.17/DEG for fuel
station O&M ($360,000/yr)
Warranty costs not
included
KC METRO: All buses 60' New
Flyer D60LF. Hybrids included Allison EP50 system
Warranty costs of $0.17 - $0.20/mi for both diesel and hybrid
buses
Diesel
and hybrid buses operated from different depots. A direct route comparison
showed a 21-22% increase in FE for hybrids
NYCT: CNG fuel station
is 6,600 scfm. Cost includes $2 mill for NG line extension to depot
CNG cost
includes $0.35/DEG for compression and fuel station maintenance
All buses were 40'
Orion VII. Hybrids included BAE
HybriDrive system
Warranty costs not
included
For all agencies maintenance costs calculated using $50/hr mechanic labor rate
SOURCES
DART: NREL, Dart's LNG Bus Fleet Final Results, October 2000
WMATA: NREL/TP-540-37626 April 2006
KC Metro: NREL/TP-540-40585 December 2006
NYCT: NREL/TP-540-40125 November 2006