R134a'ya Alternatif Bir Soğutucu Akışkan (R513A) Kullanan Buhar Sıkıştırmalı Soğutma Sistemlerinin Enerji ve Çevresel Analizi

Yildiz, Abdullah; Yildirim, Ragıp

doi:10.29130/dubited.690197

Cited by 3 publications

(1 citation statement)

References 19 publications

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“…Furthermore, it was noted that R513A had a lower Direct Emission (DE) value compared to R134A. Since R513A does not possess flammable properties, it can be used in systems designed for R134A without needing any modifications [4].…”

Section: Introductionmentioning

confidence: 99%

The Analysis of Next-Generation Refrigerants in Terms of Energy, Exergy, and LCCP Perspective

ÖZER,

KARAAGAC,

ERGÜN

et al. 2023

Düzce Üniversitesi Bilim Ve Teknoloji Dergisi

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In this study, commonly used hydrofluorocarbon (HFC)-based refrigerants R404A and R410A, as well as hydrofluoroolefin (HFO)-based environmentally friendly next-generation refrigerant R1234yf with a low global warming potential (GWP), were analyzed in terms of energy, exergy, and life cycle climate performance (LCCP) in refrigeration and air conditioning systems. All three refrigerants were examined at four different evaporation temperatures (-30°C, -15°C, -5°C, 0°C) with a constant condenser temperature of 50°C using a simulation program. For different evaporation temperatures, the performance of the refrigerants was evaluated using the first and second laws of thermodynamics, and performance coefficients, exergy efficiency, and exergy destruction were calculated. Additionally, the amount of kgCO₂e equivalent was calculated using the LCCP method. In the study, it was found that the compressor energy consumption of R410A and R1234yf refrigerants was similar and approximately 7% lower than that of the R404A refrigerant. The highest coefficient of performance (COP) value was determined for R1234yf. It was observed that R1234yf refrigerant had the highest exergy efficiency starting from -15°C. The kgCO₂e equivalent emission values calculated using the LCCP method revealed that R404A had the highest CO₂ emissions, while R1234yf had the lowest. Furthermore, based on the simulation study and theoretical calculations, it was determined that R410A and R1234yf refrigerants could be considered as alternative choices to R404A refrigerants in systems where two refrigerants are used.

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Section: Introductionmentioning

confidence: 99%

The Analysis of Next-Generation Refrigerants in Terms of Energy, Exergy, and LCCP Perspective

ÖZER,

KARAAGAC,

ERGÜN

et al. 2023

Düzce Üniversitesi Bilim Ve Teknoloji Dergisi

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Numerical energy and exergy analysis of cooling systems: low GWP alternative refrigerants (R450A and R1234ze) to R134a

Yildirim

Kumaş

Akyüz

2021

International Journal of Energy Applications and Technologies

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The use of new generation refrigerants in heating and cooling systems operating according to vapor compression cycles and the preference of renewable energy sources is very important to reduce the negative effects on the environment. Here, the energy and exergy performance of refrigerant R450A and R1234ze, which are alternatives to R134a, were theoretically examined. Energy and exergy analysis of cooling system were performed under the same working conditions (source temperature is between -15 and 15 o C, and heat sink temperature is constant 30 o C). The COP values of R134a, R1234ze, and R450A were 2.00, 1.98 and 1.97, respectively, while the heat source temperature was -15 o C. The heat source temperature was 15 o C, the COP values of R134a, R1234ze, and R450A were 4.82, 4.83 and 4.79, respectively. Under the given operating conditions, the highest total exergy destruction occurred at R134a, while the lowest total Exergy destruction occurred at R1234ze. The refrigerant with the highest and lowest cooling capacity was R134a and R1234ze. According to the results obtained from the analysis, it was concluded that R450A and R1234ze can be used instead of R134a.

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Soğutma Sisteminde R404A Yerine R454C Soğutucu Akışkanın Kullanılmasının İncelenmesi: Enerji ve Çevresel Analizi

Yildirim

Kumaş

Akyüz

2021

Teknik Bilimler Dergisi

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Özet: GWP oranı düşük soğutucu akışkanlar soğutma sistemlerinin karbon ayak izinin azaltılması için önemlidir. Bu çalışmada bir soğutma sisteminde R404A ve alternatifi olan R454C soğutucu akışkanlarının enerji ve çevresel analizi yapılmıştır. Analizler 5 farklı evaporatör sıcaklığı (-15 o C ile +5 o C) ve bir kondenser sıcaklığı (35 o C) için yapılmıştır. R454C'nin COP değeri R404A'dan yaklaşık olarak %4.0 oranında daha yüksektir. R454C'nin LCCP değeri R404A'dan biraz düşüktür (yaklaşık %3.5). Soğutma sistemlerinin karbon ayak izinin azaltılmasında soğutucu akışkanların GWP oranının düşük olması tek başına çözüm değildir. Soğutma sistemlerinin toplam karbon ayak izinin azaltılması için soğutma sistemi veriminin arttırılması ve çevre dostu enerji kaynaklarının (rüzgar, güneş, jeotermal enerji kaynakları vd.) kullanılması gerekir.

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R134a'ya Alternatif Bir Soğutucu Akışkan (R513A) Kullanan Buhar Sıkıştırmalı Soğutma Sistemlerinin Enerji ve Çevresel Analizi

Cited by 3 publications

References 19 publications

The Analysis of Next-Generation Refrigerants in Terms of Energy, Exergy, and LCCP Perspective

The Analysis of Next-Generation Refrigerants in Terms of Energy, Exergy, and LCCP Perspective

Numerical energy and exergy analysis of cooling systems: low GWP alternative refrigerants (R450A and R1234ze) to R134a

Soğutma Sisteminde R404A Yerine R454C Soğutucu Akışkanın Kullanılmasının İncelenmesi: Enerji ve Çevresel Analizi

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