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http://dx.doi.org/10.3795/KSME-B.2011.35.1.053

Power Optimization of Organic Rankine-cycle System with Low-Temperature Heat Source Using HFC-134a  

Baik, Young-Jin (New and Renewable Energy Department, Korea Institute of Energy Research)
Kim, Min-Sung (New and Renewable Energy Department, Korea Institute of Energy Research)
Chang, Ki-Chang (New and Renewable Energy Department, Korea Institute of Energy Research)
Lee, Young-Soo (New and Renewable Energy Department, Korea Institute of Energy Research)
Ra, Ho-Sang (New and Renewable Energy Department, Korea Institute of Energy Research)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.35, no.1, 2011 , pp. 53-60 More about this Journal
Abstract
In this study, an organic Rankine-cycle system using HFC-134a, which is a power cycle corresponding to a low-temperature heat source, such as that for geothermal power generation, was investigated from the view point of power optimization. In contrast to conventional approaches, the heat transfer and pressure drop characteristics of the working fluid within the heat exchangers were taken into account by using a discretized heat exchanger model. The inlet flow rates and temperatures of both the heat source and the heat sink were fixed. The total heat transfer area was fixed, whereas the heat-exchanger areas of the evaporator and the condenser were allocated to maximize the power output. The power was optimized on the basis of three design parameters. The optimal combination of parameters that can maximize power output was determined on the basis of the results of the study. The results also indicate that the evaporation process has to be optimized to increase the power output.
Keywords
Organic Rankine Cycle; Low-Temperature Heat Source; HFC-134a;
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