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Abstract

The development of industrial world 4.0 has a quite significant role. One of the main examples in industry is the heat transfer process. In the heat transfer process it is mapped into several categories, such as in cooling units which play a large role in industry. One example of a heat transfer medium that is often used in industrial development engineering is a double tube heat exchanger. In general, the working fluid used in heat exchange media is a conventional fluid (water, ethylene glycol, oil) which has basic thermal conductivity values. Hybrid nanofluids are the main solution and a new breakthrough in dealing with problems in working fluids with relatively high thermal conductivity characteristics. The initial treatment carried out in using Hybrid Nanofluids is treatment of the nanoparticles using Scanning Electron Microscopy (SEM) on the nanoparticles used. In the advanced process there is Nanoparticle Preparation treatment, Dispersion / Mixing Nanoparticles with Base Fluid treatment, Hybrid Nanofluid Sonification treatment, and Hybrid Nanofluid Testing in a double tube heat exchanger. Determining the quality and optimization scale of Hybrid Nanofluids is not only influenced by the volume concentration value but also the working temperature used. Thus, it can be concluded that the treatment of the Al2O3 - TiO2 Hybrid Nanofluid is the main factor in determining the value of the heat transfer rate and the effectiveness value of the double tube heat exchanger.

Keywords: Double Pipe Heat Exchanger, Hybrid Nanofluid, Volume Fraction, SEM (Scanning Electron Microscopy), Al₂O₃, TiO₂