Advances in New and Renewable Energy >
Optimization of an Organic Rankine Cycle System with Turbo-Expander
Received date: 2016-12-08
Revised date: 2017-02-06
Online published: 2017-02-28
Using R245fa as working fluid, a mathematic model for subcritical organic Rankine cycle (ORC) system with turbo-expander driven by low-temperature heat source was built based on Engineering Equation Solver software. Under specific working conditions, with total heat transfer area per unit net power output and thermal efficiency as objective functions, the ORC system was multi-objectively optimized by the conjugate directions method. Based on the optimization, the influence of hot and cooling water parameters on the objective functions was also investigated. The result shows that there is an optimum pinch point temperature difference in the heat exchangers and an optimum turbo-expander rotational speed that can minimize the combined objective function of ORC system. Under the optimum pinch point temperature difference and turbine rotational speed, the increase in the hot water inlet temperature will reduce the ORC system’s combined objective function, but the rise in the cooling water temperature and the temperature difference between the inlet and outlet of hot water as well as cooling water will enlarge the combined objective function.
LIU Xi , LIU Li-na , WANG Ling-bao , Bu Xian-biao , LI Hua-shan . Optimization of an Organic Rankine Cycle System with Turbo-Expander[J]. Advances in New and Renewable Energy, 2017 , 5(1) : 23 -31 . DOI: 10.3969/j.issn.2095-560X.2017.01.004
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