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http://dx.doi.org/10.6110/KJACR.2011.23.10.662

Thermodynamic Efficiencies of Organic Rankine Cycles with a Feed Liquid Heater or Regenerator  

Park, Chang-Yong (Department of Mechanical Design and Automation Engineering, Seoul National University of Science and Technology)
Hong, Woong-Ki (Department of Mechanical Design and Automation Engineering, Seoul National University of Science and Technology)
Kim, Jung-Min (Department of Mechanical Design and Automation Engineering, Seoul National University of Science and Technology)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.23, no.10, 2011 , pp. 662-669 More about this Journal
Abstract
A numerical study was performed for thermodynamic efficiencies of a basic ORC (Organic Rankine Cycle), ORC with a FLH (Feed Liquid Heater), and ORC with a regenerator. The efficiencies of the basic ORC were higher in the order of R113, R123, R245ca, and R245fa for its working fluids. It was confirmed that an optimal FLH pressure existed to maximize efficiency of the ORC with a FLH. A correlation was developed to predict the optimal FLH pressure as a function of evaporation and condensation pressure and its average absolute deviation was 0.505%. The efficiency enhancement of the basic ORC with a FLH was higher than that with a regenerator. It was presented that the basic ORC efficiency could be improved more than 10% by a FLH with $30^{\circ}C$ condensation and over $110^{\circ}C$ evaporation temperatures.
Keywords
Organic Rankine Cycle(ORC); Feed Liquid Heater(FLH); Regenerator; Thermodynamic efficiency;
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