NDLI: Optimizing Energy Conversion Using Organic Rankine Cycles and Supercritical Rankine Cycles

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Chen, Huijuan Goswami, D. Yogi Muhammad, M. Rahman Elias, K. Stefanakos
Copyright Year	2011
Abstract	The optimization of energy conversion systems is of great significance in the utilization of low-grade heat. This paper presents an analysis of 6 working fluids in 12 thermodynamic cycles to optimize the energy conversion systems. The optimal exergy efficiency of the system is dependent on the type of the thermodynamic cycle, the choice of appropriate working fluid, and the working conditions. A zeotropic mixture of R134a and R245fa shows advantages in energy conversion process, as well as its heat exchange with the heat source and heat sink. The exergy efficiency of a 0.5R134a/0.5R245fa-based supercritical Rankine cycle system is 0.643–0.689 for a turbine inlet temperature of 415–445K, which is about 30% improvement over the exergy efficiency of 0.491–0.521 for a pure R32-based organic Rankine cycle under the same temperature limits. Furthermore, the 0.5R134a/0.5R245fa mixture saves more than 60% of the cooling water during the condensation process than the pure R32, R134a and R245fa.
Sponsorship	Advanced Energy Systems Division and Solar Energy Division
Starting Page	1265
Ending Page	1272
Page Count	8
File Format	PDF
ISBN	9780791854686
DOI	10.1115/ES2011-54608
Volume Number	ASME 2011 5th International Conference on Energy Sustainability, Parts A, B, and C
Conference Proceedings	ASME 2011 5th International Conference on Energy Sustainability
Language	English
Publisher Date	2011-08-07
Publisher Place	Washington, DC, USA
Access Restriction	Subscribed
Subject Keyword	Water Temperature Cooling Organic rankine cycle Condensation Optimization Fluids Heat Energy conversion Rankine cycle Thermodynamic cycles Exergy Waste heat Heat sinks Turbines
Content Type	Text
Resource Type	Article

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