Background: The organic Rankine cycle (ORC) has been proved as a potential technique for
internal combustion engine waste heat recovery (ICE-WHR), which efficiently increase the ICE conversion
Objective: This paper presents an overview of five advanced novel ORC architectures that are most
commonly discussed in the recent decades. Based on the recent patent list, some novel ORC components
are also overviewed by the authors.
Methods: The five advanced ORC architectures are briefly introduced compared with the architecture
of basic ORC. The mentioned architectures are categorized into two types: The first four, such as the
ORC with recuperator and the supercritical ORC, aim at improving system performance, while the last
enhances the ICE aftertreatment performance. Besides, their thermodynamic characters are analyzed
based on the efficiency-oriented or output-power oriented evaluation criteria. According to the recent
patent list, some novel ORC components, such as a high-efficiency ensuring variable expansion ratio
rotary vane expander, an integrated function reciprocating single work shaft element, are also overviewed
by the authors. The typical patents of novel ORC components are overviewed by concisely
introducing their mechanical structure and working principle.
Results: An overview of five advanced novel ORC architectures are presented. Besides, on the basis of
the recent patent list, several novel ORC components are introduced.
Conclusion: The first type of the advanced ORC systems improves ORC performance, while the second
type also enhances the automotive after treatment system performance. Furthermore, the novel
ORC components are recommended to be installed in the ORC system for future use.