Staff profile

Conference Paper

• A preliminary experimental study on a free-piston engine generator prototype
  
  Zhu, S., Vijayalakshmi, S., Ngwaka, U., Roy, S., Williams, R., Smallbone, A., & Roskilly, A. P. (2025, January 1). A preliminary experimental study on a free-piston engine generator prototype. Presented at Energy Proceedings, Niigata, Japan. https://doi.org/10.46855/energy-proceedings-11548

Journal Article

• Cryogenic closed-cycle linear engine integration for cold energy recovery in fuel cell trucks
  
  Ngwaka, U., Zhu, S., Ling-Chin, J., Shivaprasad, K. V., Hu, S., Smallbone, A., & Roskilly, A. P. (2026). Cryogenic closed-cycle linear engine integration for cold energy recovery in fuel cell trucks. Applied Energy, 410, Article 127551. https://doi.org/10.1016/j.apenergy.2026.127551
• Techno-economic assessment of a fuel flexible free piston engine generator based energy system for cold ironing application
  
  Roy, D., Ngwaka, U., Shivaprasad, K. V., Zhu, S., Taghavifar, H., Williams, R., Smallbone, A., & Roskilly, A. P. (2025). Techno-economic assessment of a fuel flexible free piston engine generator based energy system for cold ironing application. Energy, 332, Article 136954. https://doi.org/10.1016/j.energy.2025.136954
• Decarbonisation pathways for industrial clusters through multi-energy systems
  
  Ngwaka, U., Khalid, Y., Ling-Chin, J., Counsell, J., Pinedo-Cuenca, R., Dawood, H., Smallbone, A. J., Dawood, N., & Roskilly, A. P. (2025). Decarbonisation pathways for industrial clusters through multi-energy systems. Sustainable Futures, 9, Article 100656. https://doi.org/10.1016/j.sftr.2025.100656
• Investigation of the operating characteristics of a free-piston closed-cycle Joule engine generator with helium as working fluid
  
  Wang, B., Zhu, S., Ngwaka, U., Jia, B., Vijayalakshmi Shivaprasad, K., Wang, Y., Smallbone, A., Paul Roskilly, A., & Luo, E. (2025). Investigation of the operating characteristics of a free-piston closed-cycle Joule engine generator with helium as working fluid. Energy Conversion and Management: X, 26, Article 100909. https://doi.org/10.1016/j.ecmx.2025.100909
• Performance and Emission Optimisation of an Ammonia/Hydrogen Fuelled Linear Joule Engine Generator
  
  Chen, G., Ngwaka, U., Wu, D., & Li, M. (2024). Performance and Emission Optimisation of an Ammonia/Hydrogen Fuelled Linear Joule Engine Generator. Energies, 17(6), Article 1490. https://doi.org/10.3390/en17061490
• Industrial cluster energy systems integration and management tool
  
  Ngwaka, U., Khalid, Y., Ling-Chin, J., Counsell, J., Siddiqui, F., Pinedo-Cuenca, R., Dawood, H., Smallbone, A., Dawood, N., & Roskilly, A. P. (2023). Industrial cluster energy systems integration and management tool. Energy Conversion and Management, 297, 117731. https://doi.org/10.1016/j.enconman.2023.117731
• Evaluation of decarbonisation options for heritage church buildings
  
  Khalid, Y., Ngwaka, U., Papworth, J., Ling-Chin, J., & Smallbone, A. (2023). Evaluation of decarbonisation options for heritage church buildings. Journal of Building Engineering, 77, Article 107462. https://doi.org/10.1016/j.jobe.2023.107462

Report

• Industrial Decarbonisation Frontiers Report: Industrial Heat and Energy Efficiency
  
  Ling Chin, J., & Roskilly, A. (2025). Industrial Decarbonisation Frontiers Report: Industrial Heat and Energy Efficiency. Industrial Decarbonisation Research and Innovation Centre.