Barış YILMAZ
(Marmara Üniversitesi,Mühendislik Fakültesi, Makina Mühendisliği,İstanbul,Türkiye)
Ebru MANÇUHAN
(Marmara Üniversitesi,Mühendislik Fakültesi, Makina Mühendisliği,İstanbul,Türkiye)
Deniz Yılmaz KARAPINAR
(İstanbul Arel Üniversitesi,Mühendislik ve Mimarlık Fakültesi, Makina Mühendisliği,34295, İstanbul, Türkiye)
Yıl: 2020Cilt: 40Sayı: 1ISSN: 1300-3615Sayfa Aralığı: 141 - 153İngilizce

43 0
THEORETICAL ANALYSIS OF A CASCADE REFRIGERATION SYSTEM WITH NATURAL AND SYNTHETIC WORKING FLUID PAIRS FOR ULTRA LOW TEMPERATURE APPLICATIONS
In this study, a theoretical model is established usingEngineering Equation Solver (EES)software in order to investigate the effects of different design and operation parameterson the performance of the cascade systems for Ultra Low Temperature(ULT)between -50 oC and -100 oC.The analysis is performed for natural and synthetic refrigerant pairs to find an environmentallyfriendly alternative to commercial synthetic refrigerants. Effects of common parameters such as the evaporation temperature oflow temperature cycle (LTC), the condensation temperature of high temperature cycle (HTC) and the temperature difference in the cascade heat exchanger (HX)have been investigated with the proposed model.Furthermore, influence of operation parametersincluding vapor quality of the refrigerant after the expansion valve and the precooler heat exchanger(PCHX) capacity, crucial to reach ULT conditions, on the system performanceare examined. This study also contributes to the theoretical evaluation of the feasible natural refrigerant alternatives for ULT applications and the comparison of these refrigerants with synthetic ones in terms of performance and the environmental aspects.It is found that the natural refrigerant R1270/R170 pair results in about 5% better COPand almost half less CO2 emissions compared to synthetic refrigerant R404A/R508B pair.
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