SAE TIR J2601/2 Hydrogen Transit Bus FuelingSAE TIR J2601/2 Hydrogen Transit Bus Fueling#201#201
Nico Bouwkamp, Technology AnalystNico Bouwkamp, Technology Analyst
California Fuel Cell Partnership California Fuel Cell Partnership ([email protected])([email protected])
Figure 2: Operating window for pressure and temperature
Context
Globally, over 80 hydrogen fuel cell transit buses are operational in daily public revenue service, with more planned for operation. These buses are fueled daily with up to 40 kilograms of H35 . Currently, no published standard for fueling these buses that establishes safety limits or performance requirements is in place.
Application Heavy duty hydrogen transit buses with a tank storage
capacity >10 kilograms of 35 MPa hydrogen Fueling buses to a full fill or ≤100% State of Charge
Preliminary fueling rates
Option A – Fast Fueling
For fast fueling of buses, up to 7.2 kilograms per minute or 120 grams per second
Option B – Normal Fueling
For normal fueling of buses, up to 3.6 kilograms per minute or 60 grams per second
Option C – Slow Fueling
For slow fueling of buses, up to 1.8 kilograms per minute or 30 grams per second
Boundary conditions (Figure 2)
Max P within vehicle tank system: 125% NWP
Bulk hydrogen gas T within vehicle fuel tanks: ≤ 85°C
T fuel at dispenser nozzle: ≥ - 40°C
State of charge ≤ 100%
Project participants
SAE TIR J2601/2 task force participants
Scope
The scope of this effort is to provide boundary performance requirements for dispensing systems used for fueling 35 MPa heavy duty hydrogen transit buses. These can be used as guidance to those building fueling systems and hydrogen fuel cell buses, and transit bus operators.
Figure 1: AC Transit fueling station (Photo courtesy of L. Eudy, NREL) Figure 3: SunLine FCEB Figure 4: AC Transit FCEB
Communication for fueling
In-advance communication
between bus OEM and station implementer
Active communication
between station & vehicle, using SAE J2799 or J1939
Recommended actions
Implement a verification process for faulty tank valves