ISI GERİ KAZANIM EŞANJÖRLÜ ORGANİK RANKİNE ÇEVRİMİNİN PARAMETRİK ANALİZİ VE İSTATİKSEL DEĞERLENDİRMESİ

Öz

Bu çalışmada farklı çalışma akışkanları için ısı geri kazanımlı eşanjör kullanan örnek bir organik Rankine çevriminin performans analizi gerçekleştirilmiştir. Akışkan olarak yaygın kullanılan R134a, R236fa, R245fa, R600a, R717 ve R718 akışkanları tercih edilmiştir. Seçilen bu akışkanlar için, 80°C ile 109°C sıcaklıkları arasında değişen atık ısı kaynak sıcaklığına ve eşanjör etkenliğine bağlı olarak sistem performansları karşılaştırılmıştır. Ayrıca sistemin performansını etkileyen parametrelerin etki oranları ve önem sırası Taguchi istatiksel metodu kullanılarak değerlendirilmiştir. Sonuç olarak, atık ısı kaynak sıcaklığının sistem performansı üzerindeki etkisinin incelenen diğer parametrelere göre daha fazla olduğu ve bu parametrenin etki oranının %59,80 olduğu belirlenmiştir. Bununla birlikte eşanjör etkenliğinin sistem performansı üzerindeki etkisinin diğer parametrelere göre çok daha az olduğu bulunmuş ve etki oranı %2.8 olarak hesaplanmıştır. Ayrıca sistemin en iyi ve en kötü çalışma şartları istatiksel analiz yapılarak belirlenmiş ve bu çalışma şartlarında organik Rankine çevriminin ısıl verimi sırasıyla %15,26 ve %8,61 olarak elde edilmiştir.

Anahtar Kelimeler

• Organik Rankine çevrimi
• Çalışma akışkanları
• Performans analiz
• Isı eşanjörü
• ısıl verim
• Taguchi metodu

A PARAMETRIC ANALYSIS OF THE PERFORMANCE OF ORGANIC RANKINE CYCLE WITH HEAT RECOVERY EXCHANGER AND ITS STATISTICAL EVALUATION

Öz

In this study, the performance of a case study of Organic Rankine Cycle with heat recovery exchanger using different fluids is analyzed. As the fluids worked in the cycle, the commonly used R134a, R236fa, R245fa, R600a, R717 and R718 are preferred. Cycle performances of the selected fluids are compared based on both the heat source’s temperature that changes between 80°C and 109°C and the effectiveness of the heat exchanger. Furthermore, the contribution ratios and the order of importance of the parameters affecting the performance of the cycle are evaluated using the Taguchi statistical method. As a result, the effect of the waste-heat source temperature on the performance of the system is greater than the other parameters examined, and the contribution ratio of this parameter is determined as 59.80%. However, effectiveness of heat exchanger is found to be the least effective parameter and the effect ratio is calculated as 2.18%. In addition, the best and worst operating conditions are determined from the statistical analysis, and in these conditions, the thermal efficiencies of the Organic Rankine Cycle are obtained as 15.26% and 8.61%, respectively.

Anahtar Kelimeler

• Organic Rankine cycle
• Working fluids
• Performance analysis
• Heat exchanger
• Thermal efficiency

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