University of Hertfordshire

Performance investigation of a power generation system with CO2 transcritical rankine cycle

Research output: Chapter in Book/Report/Conference proceedingConference contribution

  • Yunting Ge
  • Liang Li
  • Xiang Luo
  • Savvas A. Tassou
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Original languageEnglish
Title of host publication12th IIR Gustav Lorentzen Natural Working Fluids Conference, GL 2016
PublisherInternational Institute of Refrigeration
Number of pages8
ISBN (Electronic)9782362150180
Publication statusPublished - 1 Jan 2016
Externally publishedYes
Event12th IIR Gustav Lorentzen Natural Working Fluids Conference, GL 2016 - Edinburgh, United Kingdom
Duration: 21 Aug 201624 Aug 2016


Conference12th IIR Gustav Lorentzen Natural Working Fluids Conference, GL 2016
CountryUnited Kingdom


As a natural working fluid, CO2 has been widely used in refrigeration and heat pump systems due to its good thermophycical properties such as higher values of density, latent heat, specific heat and thermal conductivity etc. It can also be employed for power generation from low temperature heat resources including renewables and industry waste heat. However, the low temperature CO2 power generation system and its associated thermodynamic power cycles need to be well designed, evaluated and optimised. A research project has been carried out on low temperature power generation and heat recovery with CO2 transcritical (T-CO2) Rankine cycles. A small scale test rig was developed for the experimental investigations consisting of: A CO2 turbine, CO2 plate recuperator, air cooled condenser, liquid receiver, CO2 liquid pump and CO2 gas generator. The CO2 power generation system was heated by a thermal oil rig with the oil heated by the exhaust gas of an 80 kWe CHP unit. Preliminary experimental results show that the T-CO2 Rankine Cycle is applicable for the low temperature heat to power generation although more efficiency improvements are needed. To further evaluate the system performance, a detailed model of the tested CO2 power generation system was developed and used to simulate the system performance at different operating conditions such as heat source and sink temperatures to establish optimisation parameters.

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