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

Authors : Aniekan Ikpe, Akanimo Udofia Ekpenyong

Pages : 1021-1038

Doi:10.17714/gumusfenbil.1224486

View : 51 | Download : 45

Publication Date : 2024-12-15

Article Type : Research Paper

Abstract :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.
Keywords : Performans katsayısı, Çevre dostu, Hibrit nanoakışkanlar, Soğutucular, Soğutma sistemi