Soğutma Sistemlerinde R454C Kullanılmasının Deneysel İncelenmesi

Bu çalışmanın amacı, yüksek GWP değerine sahip R404A soğutucu akışkanı yerine hidrofloroolefin/hidroflorokarbon (HFO/HFC) karışımı düşük GWP değerine sahip R454C soğutucu akışkanın kullanılmasının incelenmesidir. Deneysel çalışmada iki farklı buharlaşma sıcaklığı (4°C ve +4°C) ve iki farklı yoğuşma sıcaklığı (30°C ve 50°C) kullanılmıştır. Her iki kondenser sıcaklığında R404A’nın elektrik tüketimi R454C’den yüksek tespit edilmiştir. Ayrıca R454C’nin COP değeri R404A’dan ortalama %10 fazla tespit edilmiştir. R454C’nin kullanılmasıyla, sistemde dolaşan kütlesel debi değerinde azalma olmuştur. R454C’nin güç tüketimi R404A’dan ortalama %15 daha düşüktür. Alternatif karışımın kompresör çıkış sıcaklıkları R404A’dan yüksek olmakla birlikte R454C’nin çalışma koşulları için uygun olduğu görülmüştür. Hesaplanan TEWI değeriyle, R454C kullanılmasıyla CO2 emisyonlarında önemli azalmalar olmuştur. R454C’nin ekserji verimi R404A’dan yaklaşık %10-%15 daha yüksek bulunmuştur. Sistemde hiçbir değişiklik yapılmadan R404A’ya alternatif olarak R454C kullanılması mümkün olabilecektir.

Anahtar Kelimeler:

HFC/HFO karışımı, R454C, düşük-GWP, TEWI, karbon ayak izi

Experimental Investigation for the Use of R454C in Refrigeration Systems

The aim of this study is investigation of using hydrofluoroolefin/hydrofluorocarbon (HFO/HFC) mixture of R454C with low-GWP as a substitute for R404A with high GWP. In the experimental study, two different evaporation temperatures (4°C, +4°C) and two different condenser temperatures (30°C, 50°C) cases were investigated. The power consumption of R404A was determined to be greater compared to R454C for both condenser temperatures. Moreover, COP of R454C was seen to be higher than R404A about by 10%. The mass flow rate of refrigerant circulating in the system was reduced using R454C. The power consumption of R454C was about 15% lower than R404A. Although the discharge temperature of compressor for the alternative refrigerant was greater than R404A, R454C is verified to be suitable for the operating conditions. TEWI computations indicates that CO2 emissions are reduced substantially using R454C. The exergy efficiency of R454C was found to be approximately 10-15% higher than R404A. It will be possible to use R454C as an alternative for R404A without performing any modification in the system.

Keywords:

HFC/HFO mixture, R454C, low-GWP, TEWI, carbon footprint,

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