FARKLI BUHAR SIKIŞTIRMALI SOĞUTMA SİSTEMLERINDE R134a YERİNE DÜŞÜK GWP DEĞERLİ SOĞUTKANLARIN ENERJI PARAMATERELERİNİN TEORİK MUKAYESESİ

Bu çalışmada, R134a yerine kullanılan düşük GWP değerine sahip R1234yf, R1234ze(E), R513A, R445A ve R450A soğutucu akışkanlarının, enerji parametreleri (soğutma kapasitesi, COP vb) üç farklı buhar sıkıştırmalı soğutma sistemi ( basit çevrim, iç ısı değiştiricili basit çevrim ve iki kademeli kaskad çevrim) için teorik olarak mukayese edilmiştir. Soğutucu akışkanların termodinamik özellikleri benzer davranışlar göstermektedir. Ayrıca sistemlerin ekserji verimleri de karşılaştırılmıştır. Yapılan çalışmada enerji parametreleri, iki farklı evaporatör sıcaklığı (-30 ve 0C) ve iki farklı kondenser sıcaklığı (40 ve 55C) için mukayese edilmiştir. Hesaplanan sonuçlara göre R450A, R134a ile hemen hemen aynı COP değerindedir. R450A’nın GWP değeri R134a ile karşılaştırıldığında %58 daha düşüktür. Çalışılan soğutma çevrimleri arasında LSHEX’li çevrim, varsayılan sistem parametreleri, sıcaklıklar ve tüm soğutucu akışkanlar için yüksek COP değerleri açısından önerilebilir. İncelenen çevrimler için en yüksek ekserji verimliliğinin R445A durumunda elde edilebildiği görülmüştür.

Anahtar Kelimeler:

R450A, R513A, R1234yf, R134a, COP, Ekserji

A COMPARATIVE ENERGETIC ANALYSIS FOR SOME LOW-GWP REFRIGERANTS AS R134a REPLACEMENTS IN VARIOUS VAPOR

In this study, the energy parameters (i.e., cooling capacity and COP) were theoretically investigated for three different vapour compression refrigeration system (basic cycle, basic cycle with liquid-to-suction heat exchanger and two-stage cascade cycle) for which R1234yf, R1234ze(E), R513A, R445A and R450A alternative refrigerants with low GWP value were used instead of R134a. The studied refrigerants demonstrated similar thermodynamic behaviour. The exergetic efficiency of the systems was also compared. The comparison of the energy parameters was carried out for two different evaporation temperatures (-30 and 0C) and two condensing temperatures (40 and 55C). According to the calculation results, R450A which almost has the same COP values as R134a comes into prominence with 58% lower GWP value compared to R134a. Among the studied refrigeration cycles, system with LSHEX can be suggested for providing a better effect in terms of COP for the considered refrigerants and temperature cases as well as assumed system parameters. It was seen for the investigated cycles that the highest exergetic efficiency could be obtained in the case of R445A.

Keywords:

R450A, R513A, R1234yf, R134a, COP, Exergy,

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