Table 5 Summary of
Results from NREL Hybrid and Natural Gas Bus Evaluations
Excel | CSV
| 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 |
| 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
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