Imperial College London

Dr James Freeman

Faculty of EngineeringDepartment of Chemical Engineering

Academic Visitor



+44 (0)20 7594 1442j.freeman12




425Bone BuildingSouth Kensington Campus





I am a post-doctoral research associate in the Clean Energy Processes (CEP) laboratory in the Department of Chemical Engineering. My research involves solar-thermal technologies for heating, power, cooling and desalination.

My PhD was a study of small-scale solar organic Rankine cycle (Solar-ORC) systems under the supervision of Dr Christos Markides and Prof Klaus Hellgardt. The project was closely linked with other research topics in the CEP group, including the design of expanders and working fluids for small-scale ORC applications. In 2015 I undertook an experimental effort to build and test a 1 kW ORC engine in the CEP lab. This system was designed primarily for use with low-temperature (non-concentrating) solar thermal collectors, although more recently it has been adapted for use with exhaust gas flows in waste heat recovery applications. You can find out more about my PhD project here. I also have an interest in solar cooling technologies, in particular the diffusion absorption refrigeration (DAR) cycle. Within the CEP group I am currently collaborating on research to adapt a DAR system to operate with low-cost heat pipe solar-thermal collectors.

I received my undergraduate degree in Environmental Sciences from the University of East Anglia in 2005, followed by a Masters degree in Renewable Energy from the University of Reading. I then spent two years with UCL working on a Knowledge Transfer Partnership (KTP) project and a further two years as an engineer with the KTP industry partner Max Fordham LLP. I joined Imperial College London in October 2012 to begin my doctoral studies.



Najjaran Kheirabadi A, Freeman J, Ramos Cabal A, et al., 2019, Experimental investigation of an ammonia-water-hydrogen diffusion absorption refrigerator, Applied Energy, Vol:256, ISSN:0306-2619

Guarracino I, Freeman J, Ramos A, et al., 2019, Systematic testing of hybrid PV-thermal (PVT) solar collectors in steady-state and dynamic outdoor conditions, Applied Energy, Vol:240, ISSN:0306-2619, Pages:1014-1030

Harraz AA, Freeman J, Wang K, et al., 2019, Diffusion-absorption refrigeration cycle simulations in gPROMS using SAFT-γ Mie, Energy Procedia, Vol:158, ISSN:1876-6102, Pages:2360-2365

Herrando M, Ramos A, Freeman J, et al., 2018, Technoeconomic modelling and optimisation of solar combined heat and power systems based on flat-box PVT collectors for domestic applications, Energy Conversion and Management, Vol:175, ISSN:0196-8904, Pages:67-85


Harraz AA, Najjaran A, Sacks R, et al., 2019, Experimentally validated simulations of a diffusion absorption refrigeration system, Pages:1045-1056

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