Influence of sealing cavity geometries on flank clearance leakage and pressure imbalance of micro-scale transcritical CO2 scroll expander by CFD modelling

Article Thermodynamics

CFD analysis of flank clearance sizes on micro-scale transcritical CO2 scroll expander

Yuheng Du et al.

Summary: The scroll-type expander is a promising candidate for micro-scale transcritical CO2 waste heat recovery power system. The performance of the expander relies heavily on the flank clearance design. This paper presents a transient CFD analysis of transcritical CO2 scroll expander with varying flank clearance sizes, revealing the optimal range of 100 to 150 μm for efficient operation.

APPLIED THERMAL ENGINEERING (2023)

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Article Thermodynamics

Unsteady and three-dimensional computational fluid dynamics modelling of scroll expander for low-grade waste heat recovery transcritical carbon dioxide micro-scale power system

Yuheng Du et al.

Summary: Recent developments in renewable energy have sparked interest in utilizing low-grade heat (< 500 K), which is often wasted due to inefficient recovery technologies. The limited system size for low-grade heat recovery (< 50 kW) has prompted the exploration of CO2-based units as a potentially more efficient alternative to ORC. This study presents a thermodynamic and CFD analysis of a scroll expander in a micro-scale T-CO2 recovery system (< 10 kW), demonstrating its superior performance compared to traditional R123 ORC expanders.

ENERGY CONVERSION AND MANAGEMENT (2023)

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Article Thermodynamics

Tangential leakage flow control with seal-grooves on the static scroll of a CO2 scroll compressor

Siyu Zheng et al.

Summary: This paper proposes a passive flow control method for tangential leakage in scroll compressors using continuous seal-grooves. Numerical methods were used to investigate the flow characteristics and the impacts of seal-groove parameters on compressor performance. The results suggest that appropriate seal-groove parameters can improve volumetric efficiency and isentropic efficiency.

APPLIED THERMAL ENGINEERING (2022)

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Review Thermodynamics

Review of supercritical CO2 technologies and systems for power generation

Martin T. White et al.

Summary: sCO(2) offers high thermal efficiencies and compact physical footprint, but faces technical challenges and operational issues related to ambient conditions and heat availability.

APPLIED THERMAL ENGINEERING (2021)

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Article Thermodynamics