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Review on Applications of zeotropic mixtures

Journal of Thermal Science 2022年第2期31卷 285-307页

作者： BAI Mengjie ZHAO Li ZHAO Ruikai Key Laboratory of Efficient Utilization of Low and Medium Grade Energy (Tianjin University)MOETianjin 300072China

Compared with the pure fluids,the zeotropic mixtures can balance the requirements of environmental protection,heat source matching and system safety,and exhibit excellent thermodynamic performance.However,compared to the widespread applications of pure fluids,zeotropic mixtures are rarely exploited in thermodynamic cycles,and there is a lack of targeted summary on refrigeration systems,organic Rankine cycle systems and combined power and refrigeration systems.In the recent years,zeotropic mixtures are developing at an unprecedented pace,while the working fluids components are inevitably explored in the process.In this paper,the research progress of zeotropic mixtures in the field of refrigeration systems,organic Rankine cycle systems and combined power and refrigeration systems are reviewed.Based on the review of zeotropic working mixtures,the reasonable predictions can be proposed.In the future,environmental problems will still be one of the most important concerned issues.Therefore,the zeotropic mixtures consisting of natural hydrocarbons and carbon dioxide,which are environmentally friendly,have great potential for development.Furthermore,zeotropic mixtures of natural working fluids can improve comprehensive energy efficiency of combined systems and will play an important role in future carbon emission reduction technologies.

关键词： combined power and refrigeration systems heat pump natural working fluids organic Rankine cycle refrigeration zeotropic mixtures

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Exergy Analysis of Organic Rankine Cycles with zeotropic Working Fluids

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Fluid Dynamics & Materials Processing 2023年第3期19卷 593-601页

作者： Antonio Mariani Davide Laiso Biagio Morrone Andrea Unich Department of Engineering DI Universitàdella Campania“Luigi Vanvitelli”Aversa(CE)Caserta81031Italy

Waste heat recovery is one of the possible solutions to improve the efficiency of internal combustion engines.Instead of wasting the exhaust stream of an energy conversion system into the environment,its residual energy content can be usefully recovered,for example in Organic Rankine Cycles(ORC).This technology has been largely consolidated in stationary power plants but not yet for mobile applications,such as road transport,due to the limitations in the layout and to the constraints on the size and weight of the ORC system.An ORC system installed on the exhaust line of a bus powered by a natural gas spark ignition engine has been investigated.The thermal power available at engine exhaust has been evaluated by measuring gas temperature and mass flow rate during real driving operation.The waste thermal power has been considered as heat input for the ORC plant simulation.A detailed heat exchanger model has been developed because it is a crucial component for the ORC performance.The exergy analysis of the ORC was performed comparing different working fluids:R601,R1233zd(E)and two zeotropic blends of the two organic pure fluids.The model allowed the evaluation of the ORC produced energy over the driving cycle and the potential benefit on the engine efficiency.

关键词： Organic Rankine Cycle zeotropic mixtures exergy analysis waste heat recovery engine efficiency internal combustion engine

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