Thermal Systems Optimization for Power Generation

Thermal systems for power generation harness heat energy through cycles such as Rankine, Brayton and their variants to convert thermal gradients into electricity. Optimisation in this domain encompasses thermodynamic cycle design, heat integration, material selection and control strategies to maximise efficiency, reliability and flexibility under variable load conditions. Recent advances focus on high-performance working fluids, such as supercritical carbon dioxide, compact turbomachinery and integrated thermal storage to reduce system footprints and capital costs. Combined heat and power configurations extend energy utilisation by delivering both electricity and process heat, while digital twins and model-based control enable predictive operation and fault detection. Multidisciplinary approaches draw on computational fluid dynamics, exergy analysis and artificial intelligence to refine component geometries, optimise heat exchanger networks and balance thermal inertia in energy storage. At a global scale, optimised thermal systems support decarbonisation by enabling high-efficiency operation of both fossil-fired and renewable heat sources, facilitating waste-heat recovery and integrating low-carbon fuels such as hydrogen and biogas. Practical applications range from micro-scale installations for buildings to utility-scale plants, with modular designs enhancing adaptability to emerging distributed energy systems.

Research from Nature Portfolio

A micro-combined heat and power unit driven by an opposed-piston engine has been developed for residential and light commercial use. The prototype achieves an electrical efficiency of 35.2%, surpassing typical limits for sub-10 kW units, and delivers combined electrical and thermal efficiencies above 93%. Optimised for natural gas, the system can also operate on renewable biogas or hydrogen, offering a pathway to zero-carbon fuel integration. Design features include compact engine packaging and advanced thermal management to support simultaneous heat provision and power generation in constrained spaces, supporting decarbonisation and cost-saving potential in diverse climate zones.

Research from all publishers

Small-scale power generation using a supercritical CO₂ cycle has been demonstrated with a partial-admission axial turbine rated at 40 000 rpm. Tested in a transcritical CO₂ loop, the system produced up to 11.55 kW of electric power at 29 369 rpm and achieved a maximum turbo-generator efficiency of 58.98%, highlighting the viability of sCO₂ technology at reduced scales for decentralised applications.

A theoretical and experimental framework for nonideal compressible fluid dynamics (NICFD) has been advanced to characterise dense vapours and supercritical fluids in power cycles. The work elucidates unconventional gas-dynamic phenomena near critical points and provides numerical and experimental methods for predicting performance in sCO₂ and organic Rankine systems. Insights into rarefaction shock structures and nonmonotonic Mach number trends inform the design of turbomachinery and heat exchangers, improving cycle efficiency and stability under transcritical conditions.

Thermal Systems Optimization for Power Generation publication trend

The graph below shows the total number of articles in thermal systems optimization for power generation across all publications each year (not limited to Nature Index journals).

Technical terms

Supercritical CO₂ (sCO₂): Carbon dioxide above its critical temperature and pressure, used as a working fluid for high-efficiency, compact power cycles.

Organic Rankine Cycle (ORC): A thermodynamic cycle using organic fluids to generate power from low-grade heat sources such as solar thermal or waste heat.

Combined Heat and Power (CHP): A system that simultaneously produces electricity and useful thermal energy from a single fuel source, enhancing overall energy utilisation.

Turbomachinery: Rotary mechanical devices, including turbines and compressors, that convert fluid energy into mechanical work or vice versa in power cycles.

Exergy Analysis: A method to quantify the maximum useful work obtainable from a system, identifying irreversibilities and guiding optimisation.

Thermal Energy Storage: Technologies that retain heat or cold for later use, improving flexibility and enabling load shifting in thermal power systems.

References

1. Demonstration of a small‐scale power generator using supercritical CO2. Carbon Energy (2024).
2. Nonideal Compressible Fluid Dynamics of Dense Vapors and Supercritical Fluids. Annual Review of Fluid Mechanics (2024).
3. Development of a micro-combined heat and power powered by an opposed-piston engine in building applications. Nature Communications (2024).