Emerging Energy Engineering
The global transition towards low carbon energy is accelerating the development of innovative technologies that require specialised emerging energy engineering. At jimmylea, we combine conventional chemical engineering with advanced engineering simulation to help technology developers, research organisations, start-ups and industrial companies transform innovative concepts into practical, scalable and commercially viable engineering solutions.
Our engineers support clients throughout the entire innovation lifecycle, from laboratory research and proof of concept through product development, pilot plants and commercial deployment. By integrating engineering judgement with advanced simulation, we help reduce technical risk, optimise process performance and accelerate the pathway from research to commercial success.
Emerging Energy Engineering Consultants
As experienced emerging energy engineering consultants, we provide practical emerging energy engineering solutions for first-of-a-kind technologies where established design methods, operating experience and industry standards may not yet exist. Our emerging energy engineering expertise helps technology developers, research organisations, start-ups and industrial companies overcome technical uncertainty and transform innovative concepts into commercially viable engineering solutions.
We work closely with clients throughout energy technology development to evaluate new technologies, develop scalable process concepts and establish the engineering foundation required for successful product development and commercial implementation. Our emerging energy engineering consultants apply conventional chemical engineering, mechanical engineering and advanced engineering simulation to reduce technical risk, optimise process performance and support confident engineering decision-making.
Our emerging energy engineering services include technology feasibility studies, conceptual engineering, process development, Front-End Engineering Design (FEED), detailed engineering design, process simulation, reactor design, equipment sizing and process optimisation, providing comprehensive engineering support throughout the entire energy technology development lifecycle.
Pilot Plant Engineering & Technology Commercialisation Engineering
Successful commercial deployment requires more than scientific innovation. It requires specialist pilot plant engineering and technology commercialisation engineering to bridge the gap between laboratory research and industrial implementation.
Our pilot plant engineering services support the transition from laboratory-scale research to commercial production by generating reliable engineering data, validating process performance and reducing scale-up risk before significant capital investment. We prepare process flow diagrams, heat and material balances, equipment specifications, process simulations and preliminary plant layouts that provide the engineering foundation for future commercial facilities.
Our technology commercialisation engineering capability combines conventional engineering with advanced Computational Fluid Dynamics (CFD), multiphase flow modelling, heat transfer, mass transfer, reaction engineering and process simulation to optimise reactor performance, improve process efficiency and accelerate energy technology development. Through integrated pilot plant engineering and technology commercialisation engineering, we help clients reduce development costs, minimise technical risk and bring innovative energy technologies to market more efficiently.
Thermochemical Water Splitting
Thermochemical water splitting is a high-temperature, cyclic redox process that decomposes water (H₂O) into hydrogen (H₂) and oxygen (O₂) using thermal energy rather than electricity. This energy is typically supplied by:
- Concentrated solar power
- High-temperature nuclear reactors
- Industrial waste heat or biomass combustion
Operating temperatures generally exceed 500°C and may reach beyond 1500°C depending on the chemical cycle. The most widely studied cycles include the ZnO/Zn, CeO₂/Ce₂O₃, and sulphur–iodine cycles.
Process Overview
Thermochemical cycles consist of at least two key steps:
Reduction
A metal oxide is heated to release oxygen and form a reduced metal oxide:
MOₓ → MOₓ₋₁ + ½O₂
Oxidation
The reduced oxide reacts with steam at a lower temperature to regenerate the metal oxide and produce hydrogen:
MOₓ₋₁ + H₂O → MOₓ + H₂
As the chemical agent is regenerated, the system operates in a closed loop. The only input is water, and the net outputs are hydrogen and oxygen.
Overall Reaction: H₂O → H₂ + ½O₂
This inherently sustainable approach enables long-term continuous operation and is well suited to integration with renewable thermal energy systems.
Engineering Design Considerations
Designing a commercial thermochemical water splitting system requires careful coordination across the reactor, heat recovery, separation and material handling subsystems. jimmylea supports the following aspects:
Reactor Design and Materials Selection
- Reactor must withstand sustained operation at ≥1200°C
- Materials must exhibit high thermal shock resistance, chemical stability and low hydrogen permeability
- Options include high-grade ceramics, nickel alloys or coated refractory metals
Heat Integration and Recovery
- High thermal efficiency is critical for overall viability
- Recuperators and heat exchangers are required to preheat feedwater and reduce energy losses. jimmylea conducts pinch analysis to recover significant thermal energy from the system.
- Thermal energy storage may be needed to maintain cycle stability
Reaction Kinetics and Cycle Control
- Multistep reaction kinetics require precise temperature and flow control
- Reactor residence time, surface area, and contact geometry must be tuned for redox completeness
- Real-time monitoring of oxygen and hydrogen evolution helps optimise switching between redox stages
Separation and Safety Systems
- High-temperature H₂/O₂ separation must prevent cross-contamination
- Inert gas purging or membranes may be used for gas separation
- Safety systems are designed to manage pressure spikes, thermal runaway or gas leaks
Improving the overall waste-to-hydrogen (WTH) efficiency involves:
- Prioritise redox pairs with high reversibility and lower temperature thresholds
- Use transient simulation tools to optimise thermal profiles and dynamic operation
- Model full cycle performance using process dynamics simulation software to identify energy bottlenecks
Balance of Plant
- Process integration studies to maximise waste heat recovery
- CFD modelling for reactor thermal gradients and gas flow uniformity
- Dynamic simulation to evaluate control strategies, ramp-up behaviour and start–stop cycles
- Advanced instrumentation specification to ensure accurate monitoring and control at elevated temperatures
Photocatalytic Water Splitting
Photocatalysis water splitting technology for hydrogen production involves using light energy to drive a chemical reaction that splits water (H₂O) into hydrogen (H₂) and oxygen (O₂). The key components and steps involved in this process are:
Photocatalyst Material: A semiconductor material, such as titanium dioxide (TiO₂), is used as the photocatalyst. This material has the ability to absorb light energy and generate electron-hole pairs.
Light Absorption: When the photocatalyst is exposed to light, typically ultraviolet (UV) light with wavelength between 282-400nm, it absorbs photons. This absorption excites electrons from the valence band to the conduction band, leaving behind positively charged holes in the valence band.
Charge Separation: The excited electrons and holes must be effectively separated to prevent their recombination. The photocatalyst material’s structure and surface properties are crucial for efficient charge separation.
Redox Reactions: The separated electrons and holes participate in redox reactions. The electrons reduce water molecules at the surface of the photocatalyst to produce hydrogen gas whilst the holes oxidise water molecules to produce oxygen gas.
Hydrogen and Oxygen Evolution: The hydrogen and oxygen gases produced in the redox reactions are collected separately. This can be facilitated by designing the photocatalytic system with appropriate compartments or membranes to prevent mixing.
Enhancing the efficiency of photocatalysis technology involves optimising the setup of the photoreactor system. Variables that can be studied include:
Optimising Reactor Design: Enhancing reactor design significantly improves the reaction rate and overall efficiency. In 1997, Dr Jimmy Lea conducted a Master of Engineering research project on the photocatalytic splitting of water into hydrogen and oxygen, which laid the groundwork for understanding the variables that affected photoreactor efficiency. In his research, he used commercial titanium dioxide (TiO₂) and light with photon wavelengths in the range of 254-310 nm. His experimental work, which focused on reactor engineering, identified four critical factors affecting the reaction rate and reactor efficiency, among other variables. The four variables were:
- Reactor Geometry: He discovered that the design and geometry of the reactor had a significant effect on the reaction rate. Designs that maximised light penetration increased the reaction rate. In addition, reactors with effective mixing and mass transfer prevented the formation of dead zones and kept the TiO₂ continually suspended, ensuring that TiO₂ particles were evenly distributed. This maximised contact time between the photocatalyst surface, light and water, thereby further increasing the reaction rate.
- Catalyst Loading: TiO₂ served to generate electron-hole pairs that drove the reaction. Increasing photocatalyst loading elevated the number of electron-hole pairs, thereby boosting the reaction rate. However, he discovered an optimal catalyst loading beyond which the reaction rate declined rapidly. This decrease was attributed to particle light-shielding, which resulted in poor light-harvesting efficiency.
- Light Intensity: The reaction rate was directly proportional to the applied UV intensity. Increasing UV intensity meant more photons struck the TiO₂ surface within a given timeframe, generating electron-hole pairs more rapidly. Using lenses or mirrors to concentrate sunlight onto the photocatalyst enhanced effective solar irradiance.
- Water Temperature: The reaction rate was directly proportional to water temperature. Higher temperatures provided reacting particles with more energy, increasing their movement and accelerating the reaction rate. He attributed this phenomenon to the enhanced kinetic energy of particles at elevated temperatures.
Increase Photocatalyst Efficiency: Develop or adopt more efficient photocatalysts than original TiO₂. Materials with higher solar-to-hydrogen efficiencies can generate more hydrogen from the same amount of sunlight. Doping TiO₂ with elements such as nitrogen, carbon or transition metals can enhance its photocatalytic activity by improving light absorption and charge carrier separation. In addition, increasing the surface area of the photocatalyst exposed to sunlight, potentially through nanostructuring or using porous materials, can provide more active sites for the reaction.
Enhance Light Absorption: Employ advanced photonic designs that enhance light absorption and reduce energy losses, such as photonic crystals or plasmonic structures. Integrate light-trapping features that increase the time light spends within the catalytic material, thus improving absorption and reaction rates.
Balance of Plant: Optimise the balance of plant performance by designing an efficient system from the outset through effective process engineering, assisted by process dynamics simulation. On the other hand, the reactor geometry can be optimised using computational fluid dynamics (CFD). This approach improves overall solar-to-hydrogen (STH) plant efficiency.
Our emerging energy engineering activities are led by Dr Jimmy Lea PhD FIEAust CPEng RPEQ, who has extensive experience in chemical engineering, process engineering, reactor design and advanced simulation of complex industrial systems. Dr Lea is a Fellow and Chartered Professional Engineer with Engineers Australia.