Numerical Analysis of Using R449A Refrigerant Alternative to R404A in Cooling Systems: 3E-Analysis (Energetic, Exergetic, and Environmental)

Öz

The direct impact of refrigerants on the environment is largely dependent on the magnitude of global warming potential (GWP) values. In this regard, fluids with low GWP are very important for the environment. Commercial refrigeration accounts for about a third of the world's HFC use. R404A is a derived HFC near an azeotropic mixture. The refrigerant of R404A is widely used in commercial refrigeration systems, especially in supermarkets. As a result of the use of R404A in cooling systems with high GWP, both indirect and direct negative effects on the environment increase. In this study, the energy, exergy, and Life Cycle Climate Performance (LCCP) of R449A, which has a lower GWP value, which can be an alternative to R404A refrigerant, were investigated theoretically. Different evaporator temperatures (-30oC to -5oC) and a condenser temperature (30oC) were used in the analysis. According to the results obtained, while the mass flow rate of R449A is approximately 13% lower than that of R404A, its exergy efficiency is 5% higher. R449A was found to be approximately 5% lower than R404A in LCCP analysis.  

Anahtar Kelimeler

• Global warming
• R449A
• R404A
• energy
• exergy
• LCCP.

Soğutma Sistemlerinde R404A'ya Alternatif R449A Soğutucu Akışkan Kullanımının Sayısal Analizi: 3E-Analizi (Enerjetik, Ekserjetik ve Çevresel)

Öz

Soğutucu akışkanların çevre üzerindeki doğrudan etkisi, büyük ölçüde küresel ısınma potansiyeli (GWP) değerlerinin büyüklüğüne bağlıdır. Bu bakımdan GWP değeri düşük akışkanlar çevre için oldukça önemlidir. Ticari soğutma, dünyadaki HFC kullanımının yaklaşık üçte birini oluşturmaktadır. R404A, azeotropik bir karışımın yakınında türetilmiş bir HFC'dir. R404A'nın soğutucu akışkanı, ticari soğutma sistemlerinde, özellikle süpermarketlerde yaygın olarak kullanılmaktadır. R404A'nın yüksek GWP'li soğutma sistemlerinde kullanılması sonucunda çevreye hem dolaylı hem de doğrudan olumsuz etkiler artmaktadır. Bu çalışmada, R404A soğutucu akışkanına alternatif olabilecek daha düşük GWP değerine sahip R449A'nın enerji, ekserji ve Yaşam Döngüsü İklim Performansı (LCCP) teorik olarak incelenmiştir. Analizde farklı evaporatör sıcaklıkları (-30oC ile -5oC) ve kondenser sıcaklığı (30oC) kullanılmıştır. Elde edilen sonuçlara göre R449A'nın kütle akış hızı R404A'ya göre yaklaşık %13 daha düşük iken ekserji verimi %5 daha yüksektir. LCCP analizinde R449A, R404A'dan yaklaşık %5 daha düşük bulunmuştur.

Anahtar Kelimeler

• Küresel ısınma
• R449A
• R404A
• enerji
• ekserji
• LCCP.

Kaynakça

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