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

Year 2020, Volume: 8 Issue: 1, 783 - 800, 31.01.2020

Abid Ustaoğlu

https://doi.org/10.29130/dubited.570330

Cited By: 1

Abstract

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

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

Abstract

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.

Keywords

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

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