Theoretical analysis on the prediction of performance coefficient of two-stage cascade refrigeration system using various alternative refrigerants

DALKILIÇ, Ahmet Selim

Theoretical analysis on the prediction of performance coefficient of two-stage cascade refrigeration system using various alternative refrigerants

Ahmet Selim DALKILIÇ (Yıldız Teknik Üniversitesi, Makine Mühendisliği Fakültesi, İstanbul, Türkiye)

Isı Bilimi ve Tekniği Dergisi

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Yıl: 2012 Cilt: 32 Sayı: 1 Sayfa Aralığı: 67 - 79 Metin Dili: Türkçe İndeks Tarihi: 29-07-2022

Theoretical analysis on the prediction of performance coefficient of two-stage cascade refrigeration system using various alternative refrigerants

Öz:

Bu çalışmada CFC-12, HCFC-22, CFC-502 soğutkanları ve HFC-134a, HFC-152a, HFC-404A, HFC-407C,HC-290, HC-600a, R717 (amonyak) gibi alternatifleri ile üç adet HFC-134a, HFC-152a, HC-600a, HC-290’danoluşan karışım soğutkanların karşılaştırılması sunulmuştur.Bir kaskad soğutma sistemi hakkındaki teorik çalışma biradet ısı değiştirici ile bağlantılı iki adet soğutma çevrimi kullanılarak yapılmıştır. Isı değiştirici yüksek basınççevriminde buharlaştırıcı olarak, düşük basınç çevriminde yoğuşturucu olarak çalışmaktadır. Yoğuşma sıcaklıkları40°Cve 60 °C, buharlaştırıcı sıcaklıkları -50 C ve -10 C arasında değişmekte olup ısı değiştirici sıcaklığı 1 Csıcaklıkta sabit tutulmuştur. Başlangıçta her iki çevrimdeki akışkanlar aynı kabul edilmiştir. Teorik analizin sonucunagore HFC-152a ve R717 alternatif soğutkanları diğer soğutkanlardan daha yüksek performans katsayısına (COP) sahipoldukları ve daha düşük şarj miktarları gerektirdikleri örnek çalışmada incelenen tüm çalışma şartlarında bulunmuştur.Bazi soğutkanların ozon tabakasının bozulmasına olan etkileri, küresel ısınmayı artıcı etkileri, alevlenme ve zehirlemekarakteristikleri göz önüne alınarak alternatif soğutkan karışımları önerilmiştir. Analizlerde azeotrop olmayanHC290/HC600a (55/45 %) karşımının, azeotrop olan HFC-152a/HFC-134a (14/86 %) ve HFC-134a/HC600a (82/18%) karışımlarının kendi baz soğutkanlarından daha düşük performans katsayıları verdikleri ve daha düşük şarjmiktarlarına gereksinim duydukları bulunmuştur. Kaskad sisteminin yüksek basınç bölgesinde R717 ve alçak basınçbölgesinde HFC-152a soğutkanlarının ayrı kullanımlarının performans katsayısı ve soğutkan şarj miktarınınbulunmasıyla ilgili olarak en iyi kombinasyon olduğu bulunmuştur. Endüstriyel sistemlerin alternatif soğutkanlardanyararlanarak çalıştırılması durumunda çalışmanın sonuçları teknolojik öneme sahiptir.

Anahtar Kelime:

Konular: Termodinamik

Çeşitli alternatif soğutkanlar kullanılarak iki kademeli kaskad soğutma sisteminin performans katsayısının tahmini hakkında teorik çalışma

Öz:

This paper presents a comparison of the refrigerants CFC-12, HCFC-22, CFC-502, and their alternatives,such as HFC-134a, HFC-152a, HFC-404A, HFC-407C, HC-290, HC-600a, R717 (ammonia), and three mixturescomposed of HFC-134a, HFC-152a, HC-600a, and HC-290. A theoretical performance study on a cascaderefrigeration system was performed using two refrigeration cycles connected through a heat exchanger in the middleworking as an evaporator for the high-pressure cycle and a condenser for the low-pressure cycle. The condensingtemperatures varied between 40 and 60 °C, the evaporating temperatures varied between -50 and -10 C, and the heatexchanger temperature was kept constant at 1 °C. The refrigerants in both cycles are assumed to be same at first. Thealternative refrigerants of HFC-152a and R717 had higher coefficients of performance (COPs) than other refrigerantsand also low refrigerant charge rates for all operating conditions in the case study, according to the results of thetheoretical analysis. The effects of the investigated refrigerants on the depletion of the ozone layer, increase in globalwarming, and flammable and toxic characteristics were considered and alternative refrigerant mixtures that may besuggested were determined. It was found that refrigerant blends of HC290/HC600a (55/45 by wt%), as a non- azeotropic mixture, and HFC-152a/HFC-134a (14/86 by wt%) and HFC-134a/HC600a (82/18 by wt%), as azeotropicmixtures, gave lower performance coefficients (COPs) and required lower refrigerant charge rates than their base purerefrigerants in the analysis. The separate usage of the refrigerants R717 and HFC-152a for the high- and low-pressuresections of the cascade system, respectively, were found to be the best combination in terms of the analysis for thedetermination of coefficients of performance (COP) and refrigerant charge rates. The results of this study are oftechnological importance for efficient design when the industrial systems are assigned to utilize various alternativerefrigerants.

Anahtar Kelime:

Konular: Termodinamik

Belge Türü: Makale Makale Türü: Araştırma Makalesi Erişim Türü: Erişime Açık

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APA	DALKILIÇ A (2012). Theoretical analysis on the prediction of performance coefficient of two-stage cascade refrigeration system using various alternative refrigerants. , 67 - 79.
Chicago	DALKILIÇ Ahmet Selim Theoretical analysis on the prediction of performance coefficient of two-stage cascade refrigeration system using various alternative refrigerants. (2012): 67 - 79.
MLA	DALKILIÇ Ahmet Selim Theoretical analysis on the prediction of performance coefficient of two-stage cascade refrigeration system using various alternative refrigerants. , 2012, ss.67 - 79.
AMA	DALKILIÇ A Theoretical analysis on the prediction of performance coefficient of two-stage cascade refrigeration system using various alternative refrigerants. . 2012; 67 - 79.
Vancouver	DALKILIÇ A Theoretical analysis on the prediction of performance coefficient of two-stage cascade refrigeration system using various alternative refrigerants. . 2012; 67 - 79.
IEEE	DALKILIÇ A "Theoretical analysis on the prediction of performance coefficient of two-stage cascade refrigeration system using various alternative refrigerants." , ss.67 - 79, 2012.
ISNAD	DALKILIÇ, Ahmet Selim. "Theoretical analysis on the prediction of performance coefficient of two-stage cascade refrigeration system using various alternative refrigerants". (2012), 67-79.

APA	DALKILIÇ A (2012). Theoretical analysis on the prediction of performance coefficient of two-stage cascade refrigeration system using various alternative refrigerants. Isı Bilimi ve Tekniği Dergisi, 32(1), 67 - 79.
Chicago	DALKILIÇ Ahmet Selim Theoretical analysis on the prediction of performance coefficient of two-stage cascade refrigeration system using various alternative refrigerants. Isı Bilimi ve Tekniği Dergisi 32, no.1 (2012): 67 - 79.
MLA	DALKILIÇ Ahmet Selim Theoretical analysis on the prediction of performance coefficient of two-stage cascade refrigeration system using various alternative refrigerants. Isı Bilimi ve Tekniği Dergisi, vol.32, no.1, 2012, ss.67 - 79.
AMA	DALKILIÇ A Theoretical analysis on the prediction of performance coefficient of two-stage cascade refrigeration system using various alternative refrigerants. Isı Bilimi ve Tekniği Dergisi. 2012; 32(1): 67 - 79.
Vancouver	DALKILIÇ A Theoretical analysis on the prediction of performance coefficient of two-stage cascade refrigeration system using various alternative refrigerants. Isı Bilimi ve Tekniği Dergisi. 2012; 32(1): 67 - 79.
IEEE	DALKILIÇ A "Theoretical analysis on the prediction of performance coefficient of two-stage cascade refrigeration system using various alternative refrigerants." Isı Bilimi ve Tekniği Dergisi, 32, ss.67 - 79, 2012.
ISNAD	DALKILIÇ, Ahmet Selim. "Theoretical analysis on the prediction of performance coefficient of two-stage cascade refrigeration system using various alternative refrigerants". Isı Bilimi ve Tekniği Dergisi 32/1 (2012), 67-79.