SECOND LAW ANALYSIS OF DIFFERENT REFRIGERANTS IN A TWO STAGE VAPOR COMPRESSION CYCLE

Bu çalışmada soğutucu akışkan olarak R600 (bütan), R290 (propan), R152a (HFC) ve R141b (HCFC) kullanıldığı buhar sıkıştırmalı soğutma çevriminde, ikinci kanun analizi EES (EES-V9.172-3D) yazılım programı kullanılarak geliştirilen program yardımıyla yapılmıştır. Sistemde aşırı kızdırma ve aşırı soğutma olduğu varsayılmış ve buna göre hesaplamalar yapılmıştır. Buhar sıkıştırmalı soğutma sisteminin elemanlarında meydana gelen tersinmezlikler, farklı buharlaştırıcı ve yoğuşturucu sıcaklıklarına göre incelenmiştir. Yoğuşturucu sıcaklığı arttıkça sistem elemanlarında meydana gelen tersinmezlikler artarken buharlaştırıcı sıcaklığının arttırılması ile sistem elemanlarında meydana gelen tersinmezlikler azalmıştır. En düşük tersinmezlik değerleri çalışmada kullanılan bütün soğutucu akışkanlar için flash tank da meydana gelmiştir. Buharlaştırıcı ve yoğuşturucu sıcaklıklarının arttırılması durumunda sistemde en düşük toplam tersinmezlik değerleri R141b soğutucu akışkanı kullanılması ile meydana gelmiştir

İKİ KADEMELİ BUHAR SIKIŞTIRMALI ÇEVRİMLERDE FARKLI SOĞUTUCU AKIŞKANLARIN İKİNCİ KANUN ANALİZİ

In this study, the second law analysis has been made by means of the program developed using the software program EES (EES-V9.172-3D) in a two stage vapor-compression refrigeration cycle for the refrigerants such as R600 (butane), R290 (propane), R152a (HFC) and R141b (HCFC) as refrigerants. It has been assumed that superheating and subcooling occur in the system and the calculations have been made accordingly. Irreversibilities occurring in the components of the cycle including compressors, evaporator, condenser, expansion valve and flash tank have been examined for different evaporator and condenser temperatures. As the condenser temperatures were increased, the irreversibilities of the components increased while they decreased with the increase of evaporator temperatures. The minimum irreversibility values occurred in the flash tank for all the refrigerants under the study. Furthermore, at the increasing values of evaporator temperatures, the total irreversibility of the refrigeration system decreased, but it increased with the condenser temperature. The total lowest irreversibility values are obtained by using R141b as a refrigerant in the refrigeration system for the increasing values of the condenser and evaporator temperature

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