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EJEKTÖR GEOMETRİSİNİN EJEKTÖRLÜ ABSORPSİYONLU SOĞUTMA SİSTEMİ PERFORMANSINA ETKİSİ

THE EFFECT OF EJECTOR GEOMETRY ON PERFORMANCE OF EJECTOR‐ABSORPTION REFRIGERATION SYSTEM

Journal Name:

  • Gazi Journal of Engineering Science

Publication Year:

  • 2015

Key Words:

Keywords (Original Language):

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Abstract (2. Language): 
In this study, the effect of ejector geometry on performance of an ejector‐absorption refrigeration system (EARS) operating with the aqua/ammonia was investigated. By using of the ejector, the obtained absorber pressure becomes higher than the evaporator pressure and thus the system works with triple‐pressure‐level. The ejector has four functions: it (i) aided pressure recovery from the evaporator, (ii) upgraded the mixing process and the pre‐absorption by the weak solution of the ammonia coming from the evaporator, (iii) increased absorber temperature and (iv) pre‐absorption in the ejector improves the efficiency of the EARS. Performance improvement by ejector geometry under maximum COP and ECOP conditions is around 2.3% for COP and 4.7% for ECOP. CFD analysis of the geometry of the ejector also functions defined in theory has been found to fulfill visually.
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Abstract (Original Language): 
Bu çalışmada, amonyak/sui le çalışan ejektörlü absorpsiyonlu soğutma sisteminde ejector geometrisinin system performansı üzerine tkileri araştırılmıştır. Ejektör kullanılmasıyla, elde edilen absorber basıncı eveparotor basıncından daha yüksek olur ve böylece system üçlü basınçla çalışır. Ejektörün dört fonksiyonu vardır: (I) eveparotördeki basıncın iyileştirilmesine yardım eder, (ii) eveparotörden gelen amonyakça zayıf eriyiğin ön absorplanmasını sağlar ve karışım işlemini iyileştirir, (iii) absorber sıcaklığını artırır, (iv) ejektördeki ön absorplama sistemin verimini iyileştirir. Maksimum COP ve ECOP değerlerinde ejector COP değerini %2.3, ECOP değerinde de %4.7 iyileşme sağlamıştır. Ayrıca CFD analizi ile ejector geometrisinin teorik olarak tanımlanan fonksiyonlarını görsel olarak yerine getirdiği tespit edilmiştir.
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