Thermo-physical evaluation of hybrid-nanofluids zeotropic mixtures in a vapor compression refrigeration system

Yıl 2024, Cilt: 14 Sayı: 4, 1021 - 1038, 15.12.2024

Aniekan Ikpe , Akanimo Udofia Ekpenyong

https://doi.org/10.17714/gumusfenbil.1224486

Öz

This research involves an experimental study of vapour compression refrigeration system (VCRS) with hybrid-nanofluids zeotropic blends of (23%-R32/25%-R125/52%-R134a) in the ratio of (0.03 - 0.15 %.Vol.) with elven samples as thus: 001, 010, 100, 011, 111, 211, 121, 112, 221, 212 and 122 gram). A morphology characterization test was conducted using scanning electron microscope (SEM) and X-ray Diffraction (XRD) amongst the selected ratios using compressor work efficiency, power consummation rate and Coefficient of performance (COP) as the core enhancement parameters. The most favorable blend produced the optimum COP in three different fraction ratios (011, 111 and112). The outcome indicated that thermo-physical and vapor compression properties of hybrid-nanofluids zeotropic (011) zero gram-TiO2, 7.5g-Al2O3/CuO; (112) 3.75 g-TiO2/Al2O3, 7.5 g-/CuO and (111) 5.0g-TiO2/Al2O3/CuO produced the best optimum performance of 3.1%, 1.41% and 1.21% respectively. The COP was found to be highest at (011) blend by about 3.1% at refrigerant temperature of -7 oC. The maximum compressor power coefficient, volumetric cooling capacity and TEGWI were found to increase by 13.51%, 5.78 % and 1.06 kg/sec CO2. The study also revealed that nanoparticles mixed in the base fluid increased the heat transfer coefficient even with a smaller particle portion of 0.003%, with optimum improvement of 0.0075 Vol % application. The calculated values of exergy destruction in each component at various % fractions are presented in Appendix I. Outcome of the study confirmed that hybrid-nanofluids zeotropic blend is energy efficient and environmentally friendly with good characteristics healthier than CFCs and HCFCs, and can offer healthier compressor/refrigerator working fluid substitute to be adopted in VCRS and air conditioning operations.

Anahtar Kelimeler

Coefficient of performance, Eco-friendly, Hybrid-nanofluids, Refrigerants, Refrigeration system

Buhar sıkıştırmalı soğutma sistemindeki hibrit-nanoakışkan zeotropik karışımların termo-fiziksel değerlendirilmesi

Öz

Bu araştırma, (0.03 - 0.15 %.Vol.) oranında (%23-R32/%25-R125/%52-R134a) hibrit-nanoakışkan zeotropik karışımlara sahip buhar sıkıştırmalı soğutma sisteminin (VCRS) deneysel bir çalışmasını içermektedir. Vol.) elf numuneleri şu şekildedir: 001, 010, 100, 011, 111, 211, 121, 112, 221, 212 ve 122 gram). Temel geliştirme parametreleri olarak kompresör iş verimliliği, güç tüketim oranı ve performans katsayısı (COP) kullanılarak seçilen oranlar arasında taramalı elektron mikroskobu (SEM) ve X-ışını Kırınımı (XRD) kullanılarak bir morfoloji karakterizasyon testi gerçekleştirildi. En uygun karışım, üç farklı fraksiyon oranında (011, 111 ve 112) optimum COP'yi üretti. Sonuç, hibrit nanoakışkanların zeotropik (011) sıfır gram-TiO2, 7.5g-Al2O3/CuO; (112) 3,75 g-TiO2/Al2O3, 7,5 g-/CuO ve (111) 5,0g-TiO2/Al2O3/CuO sırasıyla %3,1, %1,41 ve %1,21 ile en iyi optimum performansı üretti. COP'nin (011) karışımında -7 oC soğutucu akışkan sıcaklığında yaklaşık %3,1 oranında en yüksek olduğu bulunmuştur. Maksimum kompresör güç katsayısının, hacimsel soğutma kapasitesinin ve TEGWI'nin sırasıyla %13,51, %5,78 ve 1,06 kg/sn CO2 oranında arttığı bulunmuştur. Çalışma aynı zamanda baz akışkana karıştırılan nanopartiküllerin %0,003'lük daha küçük bir partikül kısmı ile bile ısı transfer katsayısını arttırdığını ve %0,0075 Hacimlik optimum uygulama iyileştirmesini ortaya çıkardı. Her bir bileşendeki ekserji yıkımının çeşitli % oranlarında hesaplanan değerleri Ek I'de sunulmaktadır. Çalışmanın sonucu, hibrit-nanoakışkan zeotropik karışımın enerji açısından verimli ve çevre dostu olduğunu, CFC'ler ve HCFC'lerden daha sağlıklı iyi özelliklere sahip olduğunu ve daha sağlıklı kompresör sunabileceğini doğruladı. /buzdolabı çalışma sıvısı ikamesi, VCRS ve iklimlendirme operasyonlarında kullanılacaktır.

Anahtar Kelimeler

Performans katsayısı, Çevre dostu, Hibrit nanoakışkanlar, Soğutucular, Soğutma sistemi

Kaynakça

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