Thermodynamic, Economic and Environmental Assessment of Vapor Compression Refrigeration System Using Mono and Binary Nanolubricants (TiO2-B)

Abstract

Nowadays, the need for energy is gaining significant importance. However, energy consumption in developed countries is quite high. Almost 40% of this energy consumption comes from heating, refrigeration, and air conditioning systems in buildings. Hence, even a minor enhancement in refrigeration systems will lead to energy savings on a global scale. Many studies are being conducted for this circumstance. One of these is the addition of nanoparticles to refrigerants and lubricants. In this study, the effects of mono and binary nanolubricants obtained from different nanoparticles (TiO2 and Boron) used at different concentrations (3.5 g/L and 7 g/L) in the vapor compression refrigeration system were evaluated in terms of energy, exergy, environment, and economy. As a result, a 16.47% increase in COP value was obtained in 7 g/L TiO2-B binary nanolubricant compared to pure POE. The energy consumption of the compressor in the system reduced by 13.06% in the 7 g/L TiO2-B binary nanolubricant compared to POE. A 35.20% decrease in total exergy destruction was detected in 7 g/L TiO2-B binary nanolubricant compared to POE. 43.44% increase in exergy efficiency occurred in 7 g/L TiO2-B binary nanolubricant compared to POE in the system. When the system was examined from an economic perspective, a 35.84% improvement was observed in the 7 g/L TiO2 binary nanolubricant compared to POE. When the system was examined environmentally, an 11.90% reduction was achieved in 7 g/L TiO2-B binary nanolubricant compared to POE. As a result, it is seen that significant improvements occur in the system as the concentration increases when mono and binary nanolubricants are used compared to POE.

Keywords

• Energy
• Environment
• Exergy
• Binary nanofluid
• Vapor compression refrigeration system

Mono ve İkili Nanoyalayıcı (TiO2-B) Kullanılan Buhar Sıkıştırmalı Soğutma Sisteminin Termodinamik, Ekonomik ve Çevresel Değerlendirmesi

Abstract

Enerji her geçen gün önemli bir hal almaktadır. Ancak, gelişmiş ülkelerdeki enerji tüketimi oldukça fazladır. Bu enerji tüketiminin neredeyse %40 binalardaki ısıtma, soğutma ve iklimlendirme sistemlerinden kaynaklıdır. Bu nedenle, bu sistemlerde yapılacak olan küçük bir iyileştirme bile küresel boyutta enerji tasarrufuna yol açacaktır. Bu durum için birçok çalışma yapılmaktadır. Bunlardan bir tanesi de soğutucu akışkanlara ve yağlayıcılara nanoparçacık ilave edilmesidir. Bu çalışmada, buhar sıkıştırmalı soğutma sisteminde farklı konsantrasyonlarda (3,5 g/L ve 7 g/L) kullanılan farklı nanoparçacıklardan (TiO2 ve Boron) elde edilen mono ve ikili nanoyağlayıcıların sistem üzerindeki etkileri enerji, ekserji, çevresel ve ekonomik açıdan değerlendirilmiştir. Sonuç olarak, COP değerinde saf POE’ye göre 7 g/L TiO2-B ikili nanoyağlayıcıda %16,47’lik artış elde edilmiştir. Sistemdeki kompresörün enerji tüketiminde saf POE’ye göre 7 g/L TiO2-B ikili nanoyağlayıcıda %13,06’lık azalma meydana gelmiştir. Toplam ekserji yıkımında saf POE’ye göre 7 g/L TiO2-B ikili nanoyağlayıcıda %35,20’lik azalma tespit edilmiştir. Sisteminde ekserji veriminde saf POE’ye göre 7 g/L TiO2-B ikili nanoyağlayıcıda %43,44’lük artış meydana gelmiştir. Sistem ekonomik açıdan incelendiğinde saf POE’ye göre 7 g/L TiO2 ikili nanoyağlayıcıda %35,84’lük iyileşme gözlenmiştir. Sistem çevresel olarak incelendiğinde saf POE’ye göre 7 g/L TiO2-B ikili nanoyağlayıcıda %11,90’lık azalma gerçekleşmiştir. Sonuç olarak, saf POE’ye göre mono ve ikili nanoyağlayıcılar kullanıldığında konsantrasyon arttıkça sistem üzerinde önemli iyileşmeler meydana geldiği görülmektedir.

Keywords

• Enerji
• Çevre
• Ekserji
• İkili nanoakışkan
• Buhar sıkıştırmalı soğutma sistemi

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