Jeotermal Enerji Kaynaklı Ara Isıtmalı Organik Rankine Çevriminin Konvansiyonel ve İleri Ekserji Analizi

Bu çalışmada, iş akışkanı olarak R152a kullanan jeotermal destekli ara ısıtmalı organik Rankine çevriminin konvansiyonel ve ileri ekserji analizleri yapılmıştır. Sistemin geliştirme potansiyelini belirlemek için ekserji yıkımının önlenebilir/kaçınılamaz kısımları, komponentler arasındaki etkileşim hakkında detaylıca bir analiz yapabilmek için de içsel/dışsal kısımları belirlenmiştir. Ayrıca yoğuşturucu ve buharlaştırıcı basınçlarının sistem performansı üzerindeki etkisi incelenmiştir. Ekserji ve enerji verimleri sırasıyla %50.69 ve %14.04 olarak hesaplanmıştır. İleri analiz sonuçlarına göre sistem çok büyük oranda kaçınılmaz (%95.04) ve içsel (%86.6) ekserji yıkımlarına sahiptir. Buradan sistemin sadece %5’lik bir geliştirme potansiyeli olduğu görülmektedir. Türbinlerdeki tersinmezliklerin tamamı dışsal iken, pompa ve buharlaştırıcıdaki tersinmezliklerin hepsi kendilerinden kaynaklanmaktadır. Toplam içsel ekserjikısmının en yüksek yüzdesi yaklaşık %93 ile buharlaştırıcıda meydana gelmiştir. En yüksek ekserji yıkımı buharlaştırıcıda olmakla birlikte bu bileşendeki geliştirme potansiyeli sıfırdır. Türbinlerdeki önlebilir ekserji yıkımı, toplam önlenebilir kısmın %85.34’üne eşittir. Sonuçlar, sistemin performansını geliştirmek için öncelikle odaklanılması gereken komponetlerin alçak ve yüksek basınç türbinleri olduğu göstermektedir.

Anahtar Kelimeler:

Jeothermal, Enerji, Ekserji, İleri Ekserji, Organik Rankine Çevrimi, Ara ısıtmalı

Conventiaonal and Advanced Exergy Analysis of Geothermal Energy Powered Reheat Organic Rankine Cycle

In this study, conventional and advanced exergy analysis have been carried out on a geothermal powered reheat organic Rankine cycle using R152a as a working fluids. The avoidable/unavoidable parts of the exergy destraction rate was obtained to decide the imporvement potential of the system and endogeious/exogenious parts of the exergy destruction rate was decided for carring out a detail analysis on the interaction among the components. Moreover, the effects of the condenser and evaporator pressures on the system performance were invesitigated. The exergy and energy efficiencies were calculated to be 50.69% and 14.04%, respectively. According to the advanced exergy analysis results, system has a large share of unavoidable (95.04%) and endogenious (86.6%) exergy destruction rates. It is seen that only a 5% of an improvement potential of the system exists. While whole exergy destruction rate in the turbines is falling into the part of exogenious part, the exergy destruction rates of the pump and evaporator results from the components’ themselves. The largest share of the endogenious exergy destrucation rate occurs in the evaporator with 93%. In conjunction with that the largest exergy decstruction occuring in the evaporator, its improvement potential is zero. The exergy destruction rates in the turbines is equal to 85.34% of the total avoidable part of the destruction. The results show that the low and high pressure turbines are the primary components to focus on to improve the system performances.

Keywords:

Geothermal, Energy, Exergy, Advanced Exergy, Reheat, Organic Ranike Cycle,

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