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This research aims to evaluate the performance of a dual-function scroll machine for HTHP-ORC systems, focusing on fluid dynamics.

Profile and performance study of a compression and expansion dual-function scroll machine for a reversible high-temperature heat pump-organic Rankine cycle system

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Randomized trial evaluates efficiency of a scroll machine for heat recovery in HTHP-ORC systems, suggesting enhanced performance characteristics.

This research aims to evaluate the performance of a dual-function scroll machine for HTHP-ORC systems, focusing on fluid dynamics.
Developed three scroll machine models with varying base circle radii (3.4, 3.7, and 4.0 mm).
Analyzed internal flow behavior under compression and expansion using computational fluid dynamics.
Measured leakage rate, filling factor, and efficiencies across different operating conditions.
Maximum gap leakage velocities were 340 m/s in compression and 186 m/s in expansion at specified angles.
Each 0.3 mm increase in base circle radius reduced compression leakage velocity by 35 m/s and expansion by 15 m/s.
At a base circle radius of 3.7 mm, the exergy efficiency peaked at 52% with a maximum filling factor of 0.97.

Kong et al. (2026) studied this question.

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Randomized trial evaluates efficiency of a scroll machine for heat recovery in HTHP-ORC systems, suggesting enhanced performance characteristics.