کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
300106 512470 2014 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Analysis of optimization in an OTEC plant using organic Rankine cycle
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
پیش نمایش صفحه اول مقاله
Analysis of optimization in an OTEC plant using organic Rankine cycle
چکیده انگلیسی


• The optimal operating temperatures are obtained for an OTEC system using ORC.
• In objective parameter evaluation, R717 performs best, followed by R152a and R600a, and R134a and 245fa perform the worst.
• Cold seawater temperature affects optimal condensing temperature more strongly than optimal evaporating temperature in an ORC.
• The optimal temperature difference of seawater is affected strongly by cold-seawater inlet temperature.

This study quantified the effects of evaporation temperature, condensation temperature, and the inlet- and outlet-temperature differences of deep cold seawater and warm seawater on the performance of an ocean thermal energy conversion (OTEC) plant using an organic Rankine cycle (ORC), and also investigated the optimal operations required for the performance. A finite-temperature-difference heat transfer method is developed to evaluate the objective parameter, which is the ratio of net power output to the total heat transfer area of heat exchanger in the system, and R717, R600a, R245fa, R152a, and R134a were used as the working fluids. The optimal evaporation and condensation temperatures were obtained under various conditions for maximal objective parameters in an OTEC system.The results show that R717 performed optimally in objective parameter evaluation among the five working fluids, and that R600a performed better than other fluids in thermal efficiency analysis. The optimal seawater temperature differences between the inlet and outlet of the evaporator and condenser are proposed. Furthermore, the influences of inlet temperatures of warm and cold seawater in the ORC are presented for an OTEC plant. The simulation results should enable the performance of an ORC system to be compared when using various organic working fluids.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Renewable Energy - Volume 68, August 2014, Pages 25–34
نویسندگان
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