1. Academic experts
  2. Research students
  3. Students
  4. Alumni
  5. Senior people at City
  6. Non-academic staff
  7. Honorary graduates

Contact Information


Postal Address

City, University of London
Northampton Square
United Kingdom



Dr Martin White obtained a MEng in Mechanical Engineering from the University of Southampton in 2011, and a PhD in Mechanical Engineering from City, University of London in October 2015. His PhD investigated the design and analysis of small-scale turbines for low-temperature organic Rankine cycles. After a year working as a Research Associate at Imperial College London within the Clean Energy Processes Laboratory, he returned to City and is currently working on the EPSRC funded project NextORC.

As a researcher his focus is on the development of small-scale energy systems suitable for the power generation from low and medium temperature heat sources, such as solar, biomass, geothermal and waste heat. This encompasses system design and optimisation, working-fluid selection and component, with significant focus on turbomachinery components.


  1. PhD in Mechanical Engineering, City, University of London, UK, Apr 2012 – Oct 2015
  2. MEng in Mechanical Engineering, University of Southampton, UK, Oct 2007 – Jul 2011


  1. Research Fellow, City, University of London, May 2018 – present
  2. Postdoctoral Research Associate, City, University of London, May 2017 – Apr 2018
  3. Postdoctoral Research Associate, Imperial College London, May 2016 – Apr 2017


  1. White, M.T. and Sayma, A.I. (2019). Simultaneous cycle optimization and fluid selection for ORC systems accounting for the effect of the operating conditions on turbine efficiency. Frontiers in Energy Research, 7(JUN). doi:10.3389/fenrg.2019.00050.
  2. White, M.T., Oyewunmi, O.A., Chatzopoulou, M.A., Pantaleo, A.M., Haslam, A.J. and Markides, C.N. (2018). Computer-aided working-fluid design, thermodynamic optimisation and thermoeconomic assessment of ORC systems for waste-heat recovery. Energy, 161, pp. 1181–1198. doi:10.1016/
  3. White, M.T., Markides, C.N. and Sayma, A.I. (2018). Working-fluid replacement in supersonic organic rankine cycle turbines. Journal of Engineering for Gas Turbines and Power, 140(9). doi:10.1115/1.4038754.
  4. White, M.T. and Sayma, A.I. (2018). A generalised assessment of working fluids and radial turbines for non-recuperated subcritical organic rankine cycles. Energies, 11(4). doi:10.3390/en11040800.
  5. White, M.T., Oyewunmi, O.A., Haslam, A.J. and Markides, C.N. (2017). Industrial waste-heat recovery through integrated computer-aided working-fluid and ORC system optimisation using SAFT-Γ Mie. Energy Conversion and Management, 150, pp. 851–869. doi:10.1016/j.enconman.2017.03.048.
  6. White, M. and Sayma, A.I. (2016). Improving the economy-of-scale of small organic rankine cycle systems through appropriate working fluid selection. Applied Energy, 183, pp. 1227–1239. doi:10.1016/j.apenergy.2016.09.055.
  7. White, M. and Sayma, A.I. (2015). The Application of Similitude Theory for the Performance Prediction of Radial Turbines Within Small-Scale Low-Temperature Organic Rankine Cycles. Journal of Engineering for Gas Turbines and Power, 137(12). doi:10.1115/1.4030836.


  1. Alzaili, J., White, M. and Sayma, A. (2020). Developments in Solar Powered Micro Gas Turbines and Waste Heat Recovery Organic Rankine Cycles. Lecture Notes in Networks and Systems (pp. 439–452).

Conference papers and proceedings (8)

  1. White, M., Read, M. and Sayma, A. (2018). Using a cubic equation of state to identify optimal working fluids for an ORC operating with two-phase expansion using a twin-screw expander. 17th International Refrigeration and Air Conditioning Conference 9-12 July, Purdue, USA.
  2. White, M. and Sayma, A. (2018). A preliminary comparison of different turbine architectures for a 100 kW supercritical CO2 Rankine cycle turbine. The 6th International Supercritical CO2 Power Cycles Symposium 27-29 March, Pittsburgh, Pennsylvania.
  3. White, M.T., Read, M.G. and Sayma, A.I. (2018). Optimisation of cascaded organic Rankine cycle systems for high-temperature waste-heat recovery.
  4. White, M.T. and Sayma, A.I. (2018). Design of a Closed-Loop Optical-Access Supersonic Test Facility for Organic Vapours. ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition.
  5. White, M.T. and Sayma, A.I. (2018). Design of a closed-loop optical-access supersonic test facility for organic vapours.
  6. Oyewunmi, O.A., White, M.T., Chatzopoulou, M.A., Haslam, A.J. and Markides, C.N. (2017). Integrated computer-aided working-fluid design and power system optimisation: Beyond thermodynamic modelling.
  7. White, M. and Sayma, A.I. (2016). Investigating the effect of changing the working fluid on the three-dimensional flow within organic rankine cycle turbines.
  8. Arroyo, A., McLorn, M., Fabian, M., White, M. and Sayma, A.I. (2016). Rotor-dynamics of different shaft configurations for a 6 KW micro gas turbine for concentrated solar power.

Journal articles (6)

  1. White, M.T., Oyewunmi, O.A., Chatzopoulou, M.A., Pantaleo, A.M., Haslam, A.J. and Markides, C.N. (2017). Integrated computer-aided working-fluid design and thermoeconomic ORC system optimisation. Energy Procedia, 129, pp. 152–159. doi:10.1016/j.egypro.2017.09.095.
  2. Unamba, C.K., White, M., Sapin, P., Freeman, J., Lecompte, S., Oyewunmi, O.A. … Markides, C.N. (2017). Experimental Investigation of the Operating Point of a 1-kW ORC System. Energy Procedia, 129, pp. 875–882. doi:10.1016/j.egypro.2017.09.211.
  3. White, M., Sayma, A.I. and Markides, C.N. (2017). Supersonic flow of non-ideal fluids in nozzles: An application of similitude theory and lessons for ORC turbine design and flexible use considering system performance. Journal of Physics: Conference Series, 821(1). doi:10.1088/1742-6596/821/1/012002.
  4. White, M. and Sayma, A.I. (2015). The impact of component performance on the overall cycle performance of small-scale low temperature organic Rankine cycles. IOP Conference Series: Materials Science and Engineering, 90, pp. 12063–12063. doi:10.1088/1757-899x/90/1/012063.
  5. White, M. and Sayma, A.I. (2015). The one-dimensional meanline design of radial turbines for small scale low temperature organic rankine cycles. Proceedings of the ASME Turbo Expo, 2C. doi:10.1115/GT2015-42466.
  6. White, M. and Sayma, A.I. (2015). System and component modelling and optimisation for an efficient 10 kWe low-temperature organic Rankine cycle utilising a radial inflow expander. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 229(7), pp. 795–809. doi:10.1177/0957650915574211.