The National Academies Press

Currently Skimming:

Pages 33-53

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.

From page 33... ... 33 PHASE 2 TECHNOLOGY SELECTION AND SPECIFICATIONS 2.1 Overview Your ZEB technology selection should be based on assumed performance on your routes, under your service constraints. The efficiency and range of ZEBs can vary significantly between different bus models and types of routes. Read the entire page →
From page 34... ... 34 Guidebook for Deploying Zero-Emission Transit Buses 2.2 Key Stakeholder Considerations Project Managers • Base technology selection on modeling results and specific transit agency requirements, as bus performance can vary greatly based on temperature, topography, and driving habits. • Ensure route modeling efforts do not simply rely on OEM-provided range or energy efficiency estimates as those are typically based on ideal operating conditions and may not reflect your transit service demands. Read the entire page →
From page 35... ... Technology Selection and Specifications 35 2.3 Bus Performance Evaluation Comprehensive analysis that evaluates potential bus performance under a range of conditions is one of the only ways to predict success of your deployment in your service area. Transit agencies have used the following approaches to evaluate bus performance in advance of ZEB deployments: • Bus modeling and route simulation, • Evaluating data from a test bus demonstration by an OEM or nearby transit agency, and • Analyzing data from other ZEB deployments. Read the entire page →
From page 36... ... 36 Guidebook for Deploying Zero-Emission Transit Buses • Ambient air temperature. Heating and cooling energy required to maintain passenger comfort. Read the entire page →
From page 37... ... Technology Selection and Specifications 37 2. Collect data from route(s) Read the entire page →
From page 38... ... 38 Guidebook for Deploying Zero-Emission Transit Buses Varying road conditions, traffic, HVAC usage, highway driving, and hill climbs will drive routes toward either a nominal or strenuous condition. The following parameters may help define a "strenuous" efficiency: • Vehicle weight: At or close to the gross vehicle weight rating (GVWR) Read the entire page →
From page 39... ... Technology Selection and Specifications 39 4. Model impacts from battery degradation. Read the entire page →
From page 40... ... 40 Guidebook for Deploying Zero-Emission Transit Buses schedule adherence or route completion at risk. For on-route charging scenarios make sure to account not just for charge time, but also for time to dock to the charger and disengage from the charger. Read the entire page →
From page 41... ... Technology Selection and Specifications 41 2.5 Procurement Considerations Some states have FTA-compliant bus procurement contracts that include ZEBs. Procuring ZEBs from an existing state contract can save time and money; however, developing technical specifications specific to your requirements is critical even with this approach. Read the entire page →
From page 42... ... 42 Guidebook for Deploying Zero-Emission Transit Buses The sections below provide additional guidance for developing technical specifications for the bus and fueling infrastructure. As an emerging industry, standardized, well-vetted procurement guidelines for ZEBs do not yet exist. Read the entire page →
From page 43... ... Technology Selection and Specifications 43 4. Fire safety and hydrogen gas detection. Read the entire page →
From page 44... ... 44 Guidebook for Deploying Zero-Emission Transit Buses Require that the bus must be able to complete the operating profile described in the specifications for the entire service life of the bus. Read the entire page →
From page 45... ... Technology Selection and Specifications 45 The sections below outline areas of focus for charging and hydrogen fueling infrastructure technical specifications. The specifications may vary based on the services that are being procured (e.g., design, construction) Read the entire page →
From page 46... ... 46 Guidebook for Deploying Zero-Emission Transit Buses corresponding energy consumption of each trip when the bus is away from the charger, or describe the performance requirements of the charging equipment based on your planned service for all of the buses using the fast charge. On-route charging that utilizes overhead or inductive technology requires proper bus-charger alignment for optimal charging. Read the entire page →
From page 47... ... Technology Selection and Specifications 47 Regardless of the preferred configuration, specify the location for the charger port(s) for plug-in chargers (i.e., front or rear, curbside or streetside) Read the entire page →
From page 48... ... 48 Guidebook for Deploying Zero-Emission Transit Buses between the charger data monitoring systems and your transit agency's existing data monitoring systems and access to the necessary data. 2.5.1.2.2 FCEB Hydrogen Fueling Infrastructure Detailed specifications for hydrogen fueling stations are complex and appropriately licensed third parties should be consulted for assistance. Read the entire page →
From page 49... ... Technology Selection and Specifications 49 of the site, the location of electrical utility tie -ins, and available locations for equipment staging. Read the entire page →
From page 50... ... 50 Guidebook for Deploying Zero-Emission Transit Buses • Performance standards.Service demonstration criteria could require the OEM, upon bus delivery, to demonstrate performance standards based on the OEM's modeling efforts . • Extreme weather operation. Read the entire page →
From page 51... ... Technology Selection and Specifications 51 compared to the gross or nameplate capacity) determined as the point at which the batteries can no longer provide the energy or power required to meet the design operating profile. Read the entire page →
From page 52... ... 52 Guidebook for Deploying Zero-Emission Transit Buses • Spare parts, • Final parts, • Component repair, • Operator instructions, • Bus schematics, and • Training materials. Ensure adequate OEM-provided operations, maintenance, and safety training is included in the contract. Read the entire page →
From page 53... ... Technology Selection and Specifications 53 • Appropriate plans for operations, maintenance, and safety training, with clear requirements for training hours, aids, materials, tools and diagnostic equipment. 2.6 Additional Resources • Alternative Fuel Safety, National Highway Traffic Safety Administration • Autonomie, Argonne National Laboratory, U.S. Read the entire page →

From page 33...

... 33 PHASE 2 TECHNOLOGY SELECTION AND SPECIFICATIONS 2.1 Overview Your ZEB technology selection should be based on assumed performance on your routes, under your service constraints. The efficiency and range of ZEBs can vary significantly between different bus models and types of routes.