Exergy Analysis of a Double-Stage Organic Rankine Cycle Using Renewable Energy

Öz

Engineering Equation Solver program (EES). For certain temperature limits in the first and second stages (S-I and S-II) R245fa + R245fa was used as refrigerant pair. This study aims to determine the effect of working temperature on system efficiency, exergy efficiency and the most suitable working temperature. The results showed that at 425K, 14.11kW exergy destruction is obtained in Pump-1 higher than other components. The smallest exergy destruction is 0.133kW is observed in Turbine-2 at 400K temperature. The highest thermal and exergy efficiencies of the whole system were obtained at 400K temperature as 8.85% and 48.55%, respectively.

Anahtar Kelimeler

• Organic Rankine cycle
• Exergy analysis
• Double stage cycle
• Solar power

Yenilenebilir Enerji Kullanan İki Aşamalı Bir Organik Rankine Çevriminin Ekserji Analizi

Öz

Bu çalışmada, Mühendislik Denklem Çözücü programı (EES) kullanılarak çift aşamalı bir Organik Rankine Çevriminin (ORC) ekserji analizi yapılmıştır. Birinci ve ikinci kademelerde (S-I ve S-II) belirli sıcaklık limitleri için R245fa + R245fa akışkan çifti olarak kullanılmıştır. Bu çalışma, çalışma sıcaklığının sistem verimliliğine, ekserji verimliliğine etkisini belirlemeyi ve en uygun çalışma sıcaklığını bulmayı amaçlamaktadır. Sonuçlar, 425K'da Pompa-1’de diğer bileşenlerden daha yüksek 14.11kW ekserji tahribatının elde edildiğini göstermiştir. En küçük ekserji tahribatı 0.133kW olup, Türbin-2’de 400K sıcaklıkta gözlenmektedir. Tüm sistemin en yüksek termal ve ekserji verimleri sırasıyla %8,85 ve %48,55 ile 400K sıcaklıkta elde edilmiştir.

Anahtar Kelimeler

• Organik Rankine çevrimi
• Ekserji analizi
• İki aşamalı çevrim
• Güneş enerjisi

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