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 (nbouwkamp@cafcp.org)(nbouwkamp@cafcp.org)

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