Güneş Enerjisi Kaynaklı Farklı Transkritik CO2 Rankine Çevrimlerinin Karşılaştırılması

Abstract

Bu çalışmada, vakum tüplü güneş kollektörlü farklı transkritik CO2 Rankine çevrimleri incelenmiştir. Bu kapsamda literatürde yaygın olarak kullanılan basit, rejeneratör, yeniden ısıtmalı, rejeneratör ve yeniden ısıtmalı transkritik CO2 Rankine çevrimleri seçilmiştir. İlk olarak, belirli çalışma parametreleri altında dört farklı transkritik CO2 Rankine çevriminin termodinamik analizleri yapılarak sistemlerin enerji ve ekserji verimleri hesaplanmıştır. Ayrıca türbin giriş sıcaklığı ve türbin giriş basıncı gibi sistem performansını etkileyen faktörlere göre parametrik çalışmalar yapılmıştır. Hem analizler hem de parametrik çalışmalar EES bilgisayar programı kullanılarak yapılmıştır. Termodinamik analizler sonucunda en yüksek enerji verimi % 11.8 ile yeniden ısıtmalı ve rejeneratörlü transkritik CO2 Rankine çevrimi için, en düşük enerji verimi ise % 6.6 ile basit transkritik CO2 Rankine çevrimi ve yeniden ısıtmalı transkritik CO2 Rankine çevrimi için hesaplanmıştır. Tüm transkritik CO2 Rankine çevrimlerinin enerji ve ekserji verimleri türbin giriş basıncının artmasıyla artarken, tüm transkritik CO2 Rankine çevrimlerinin enerji ve ekserji verimi pompa giriş basıncının artmasıyla azalmıştır.

Keywords

• Vakum tüplü U borulu güneş kollektörü
• Transkritik CO2 Rankine çevrimi
• Enerji
• Ekserji

Comparative Assessment of Solar Energy Based Transcritical CO2 Rankine Cycles for Different Layouts

Abstract

In this study, different transcritical CO2 Rankine (tCO2-RC) cycles with vacuum tube solar collectors are examined. In this context, the transcritical CO2 Rankine cycle in different configurations, such as simple, regenerator, reheat, regenerator, and reheat, which is widely used in the literature, has been chosen. First, the energy and exergy efficiencies of the cycles were founded by performing thermodynamic analyzes of four various tCO2-RCs under certain operating parameters. Moreover, parametric studies were carried out according to the factors affecting the system performance, like turbine input temperature and input pressure of the turbine. Both analyzes and parametric studies were conducted utilizing the Engineering Equation Solver (EES) computer program. As outcomes of analyzes, the highest thermal efficiency was founded for the tCO2-RC with reheat and regenerator by 11.8%, and the lowest energy efficiency was calculated for the simple tCO2-RC and tCO2-RC with reheat by approximately 6.6%. While all tCO2-RCs' energy and exergy efficiencies increased with the rise of the turbine’s input pressure, the energy and exergy efficiency of all tCO2-RCs decreased with the rise of the pump’s input pressure.

Keywords

• Evacuated U-tube solar collector
• Transcritical CO2 Rankine cycle
• Energy
• Exergy

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