Liquid fuels offer superior energy density for decarbonizing heavy transport and aviation.

Why It Matters

Designers and engineers in the transport sector must consider the physical constraints of energy storage when developing sustainable solutions. Prioritizing energy-dense fuels allows for greater payload and range, crucial for heavy-duty applications and long-haul flights, thereby accelerating the transition away from fossil fuels.

Key Finding

Liquid low-carbon fuels like methanol and power-to-liquid fuels are more practical for heavy transport and aviation than current battery technology due to their higher energy density, though infrastructure and cost remain significant challenges.

Key Findings

• Current battery technology limits payload and range for heavy haulage compared to diesel.
• Methanol is a suitable liquid fuel for shipping due to its energy density and compatibility with existing designs.
• Power-to-liquid fuels are the most appropriate for commercial aviation due to scale and regulatory requirements.
• Fuel cost and infrastructure are major barriers to low-carbon fuel adoption.

Research Evidence

Aim: What are the most suitable low-carbon energy carriers for decarbonizing the maritime, aviation, and haulage sectors, considering factors like energy density, cost, and lifecycle emissions?

Method: Literature Review

Procedure: The study reviewed existing literature on various low-carbon energy carriers (electricity, biofuels, hydrogen, electrofuels) and assessed their suitability for the shipping, aviation, and haulage sectors based on key performance indicators.

Context: Transportation sector decarbonization

Design Principle

Energy density is a critical design parameter for sustainable heavy transport and aviation solutions.

How to Apply

When specifying powertrains for trucks, ships, or aircraft, evaluate the energy density of available low-carbon fuels against the required operational range and payload capacity.

Limitations

The analysis relies on existing literature and may not capture the very latest technological advancements or specific regional infrastructure developments.

Student Guide (IB Design Technology)

Simple Explanation: For big vehicles like ships and planes, batteries are too heavy and don't last long enough. Liquid fuels like methanol or special 'power-to-liquid' fuels are better because they pack more energy into a smaller, lighter package.

Why This Matters: This research helps you understand why certain energy sources are better for different types of vehicles, especially for larger ones that need a lot of power.

Critical Thinking: While liquid fuels offer advantages in energy density, what are the potential environmental and safety trade-offs compared to electrification, and how might these be mitigated in future designs?

IA-Ready Paragraph: The selection of an appropriate energy carrier is paramount for the successful decarbonization of heavy transport and aviation. Research indicates that for applications demanding high energy density, such as shipping and commercial aviation, liquid fuels like methanol and power-to-liquid electrofuels present a more viable solution compared to current battery electric technologies due to limitations in battery specific energy and range. This is crucial for maintaining payload capacity and operational efficiency in these sectors.

Project Tips

• When choosing an energy source for a vehicle design, research its energy density (how much energy per unit of weight or volume).
• Consider if your design needs to be retrofitted or if it's a completely new design, as this impacts fuel choice.

How to Use in IA

• Use this research to justify your choice of energy source for a vehicle design, especially if you are designing for heavy transport or aviation.

Examiner Tips

• Demonstrate an understanding of the trade-offs between different energy carriers, particularly concerning energy density and its impact on vehicle design.

Independent Variable: Type of low-carbon energy carrier (e.g., battery, biofuel, hydrogen, electrofuel)

Dependent Variable: Suitability for transport sector (measured by energy density, cost, lifecycle emissions, land-use)

Controlled Variables: Transport sector (maritime, aviation, haulage)

Strengths

• Comprehensive review of multiple low-carbon fuel options.
• Analysis across three major transport sectors.

Critical Questions

• How will the cost and infrastructure for hydrogen and electrofuels evolve in the next decade?
• What are the specific challenges and opportunities for retrofitting existing vessels and aircraft with new fuel systems?

Extended Essay Application

• Investigate the lifecycle environmental impact of producing and distributing a specific low-carbon fuel (e.g., green methanol) for a chosen transport sector.
• Develop a comparative analysis of different energy storage solutions for a hypothetical long-haul electric truck, considering battery vs. hydrogen fuel cell options.

Source

Decarbonising ships, planes and trucks: An analysis of suitable low-carbon fuels for the maritime, aviation and haulage sectors · Advances in Applied Energy · 2021 · 10.1016/j.adapen.2021.100008