Thermodynamic and Exergetic Analyses of Power and Cooling Systems
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Abstract
Abstract
Organic Rankine cycle (ORC) has gained increasing attention in thermal power generation, but with a relatively low efficiency due to the irreversible loss of the evaporation process. In order to improve the performance of ORC, dual-stage ORC (DORC) and organic Rankine flash cycle (ORFC) were proposed. Previous numerical studies have demonstrated that DORC and ORFC can indeed enhance the system performance. However, experimental verification is lacking. This study designed and established an experimental setup to achieve the switching of the DORC and ORFC systems via valve start-stop operation, using R245fa as the working fluid. The power generation performance of ORFC is tested and compared with that of the DORC. Experimental results reveal that the working fluid of ORFC undergoes incomplete evaporation before entering the scroll expander, which can effectively reduce the irreversible loss of between the heat source and the working fluid. Compared with DORC, ORFC achieves a higher specific power output due to the further reduction the injection temperature. The thermal efficiency of ORFC is almost the same as that of DORC. Nevertheless, ORFC exhibits lower net power generation and exergy efficiency due to higher power consumption of the working fluid pumps.
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@article{Wang2026Experimental,
title = {Experimental comparison of dual-stage organic Rankine cycle and organic Rankine flash cycle for low-temperature geothermal power generation},
author = {Tianren Wang and Zhenye Tian and Hao Li and Zizhang Wang and Tailu Li},
journal = {Unconventional Resources},
year = {2026},
doi = {10.1016/j.uncres.2026.100515},
url = {https://doi.org/10.1016/j.uncres.2026.100515}
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