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ISSN Druckformat: 1940-2503
ISSN Online: 1940-2554
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TRANSCRITICAL CARBON DIOXIDE FLOW IN A TUBULAR HEAT EXCHANGER: APPLICATIONS IN WASTE HEAT RECOVERY
ABSTRAKT
Nonlinear thermophysical property variations in near-critical fluids give rise to large heat transfer coefficients, thus making them an ideal fluid for harnessing waste heat. Heat recovery from a power plant steam condenser by utilizing a transcritical flow of carbon dioxide in a bottoming cycle is considered. Thermal transport characteristic of transcritical carbon dioxide flowing in a tubular heat exchanger is numerically investigated. Transcritical carbon dioxide flowing in a circular cross-section tube with the outer wall heated by condensing steam (an isothermal wall) is considered for both horizontal and vertical configurations. The thermal transport characteristics for both configurations are examined. Due to the rapid and large variations of thermophysical properties with small temperature changes, transcritical fluid flows are usually characterized by the development of mixed convection and buoyancy plays a significant role in the flow dynamics. The effect of buoyancy on the thermal transport characteristics is also investigated. The predicted results from the present study can be used in designing waste-heat-driven organic Rankin cycles for power generation.
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Li Xiaoya, Tian Hua, Shu Gequn, Zhao Mingru, Markides Christos N., Hu Chen, Potential of carbon dioxide transcritical power cycle waste-heat recovery systems for heavy-duty truck engines, Applied Energy, 250, 2019. Crossref