THERMODYNAMIC ANALYSIS OF A NOVEL COMBINED SUPERCRITICAL CO2 AND ORGANIC RANKINE CYCLE

Year 2023, , 33 - 47, 20.01.2023

Ahmet Elbir , Mehmet Erhan Şahin , Arif Emre Özgür , Hilmi Cenk Bayrakçı

https://doi.org/10.47933/ijeir.1187448

Cited By: 2

Abstract

Sustainable and innovative technologies offer us the inevitable opportunity to use the last drop of energy. In this study, gradual compression and gradual expansion were carried out with intermediate heat exchangers in single and double stage S-CO2 brayton cycles operating at the same operating temperature ranges. The ORC (Organic Rankine Cycle) is integrated from the system's waste heat source. The performance characteristics of the S-CO2 power systems and the combined ORC system, as well as the energy and energy analysis results of the system components for each component, are presented in tables. The performance of the gradual compression and gradual expansion systems, the operating conditions of the stepless system operating under the same operating conditions, were examined. It has been reported that there is an increase in electricity generation of 136% and an increase in thermal efficiency of 22% when switching from single-stage to double-stage. The addition of the ORC system to the single-stage and double-stage systems increased the thermal efficiency by 10.2% and the net work by 39.75KW. When switching from single stage to double stage, energy destruction increased by 86% and energy efficiency decreased by 1%. The addition of the ORC system to the single-stage and double-stage systems increased the energy efficiency by 15% and the energy destruction by 44.27KW. As a result, nature-friendly CO2 shows us that it is an alternative, innovative, and sustainable source in low temperature applications.

Keywords

Brayton cycle, S_CO2, ORC, Enegy analysis, Exergy analysis.

YENİ BİR KOMBİNE SÜPERKRİTİK CO2 VE ORGANİK RANKİNE DÖNGÜSÜNÜN TERMODİNAMİK ANALİZİ

Abstract

Sürdürülebilir ve yenilikçi teknolojiler, bize enerjinin son damlasını kullanmak için kaçınılmaz bir fırsat sunuyor. Bu çalışmada, aynı çalışma sıcaklık aralıklarında çalışan tek ve çift kademeli S-CO2 brayton çevrimlerinde ara ısı eşanjörleri ile kademeli sıkıştırma ve kademeli genleşme gerçekleştirilmiştir. ORC (Organik Rankine Döngüsü), sistemin atık ısı kaynağından entegre edilmiştir. S-CO2 güç sistemlerinin ve birleşik ORC sisteminin performans özellikleri ile her bir bileşen için sistem bileşenlerinin enerji ve enerji analizi sonuçları tablolarda sunulmaktadır. Kademeli sıkıştırma ve kademeli genleşme sistemlerinin performansı, aynı çalışma koşullarında çalışan kademesiz sistemin çalışma koşulları incelenmiştir. Tek kademeliden çift kademeliye geçildiğinde elektrik üretiminde %136, ısıl verimde ise %22 artış olduğu bildirildi. Tek kademeli ve çift kademeli sistemlere ORC sisteminin eklenmesi, termal verimliliği %10,2 ve net çalışmayı 39,75KW artırdı. Tek kademeden çift kademeye geçildiğinde enerji tahribatı %86 arttı ve enerji verimliliği %1 azaldı. Tek kademeli ve çift kademeli sistemlere ORC sisteminin eklenmesi, enerji verimliliğini %15, enerji tahribatını ise 44,27KW artırmıştır. Sonuç olarak doğa dostu CO2 düşük sıcaklık uygulamalarında alternatif, yenilikçi ve sürdürülebilir bir kaynak olduğunu bize göstermektedir.

Keywords

Brayton Çevrimi, S_CO2, ORC, Enerji analizi, Ekserji analizi

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