Abstract
Enhancing the performance of heat transfer fluids (HTF) is a key target for improving the efficiency of many industrial processes. Employing nanofluids for this purpose, by dispersing nanoparticles into the initial HTF to improve its thermo-physical properties, is one possible way to increase its heat transfer capacity. However, testing these properties at high temperature is not always easy. An experimental setup consisting of a thermohydraulic loop for high-temperature heat transfer measurements was developed in this work. The accuracy and repeatability of the measurements taken in the heat transfer loop were ensured. A nanofluid consisting of a commercial thermal oil, doped with Sn nanoparticles at 1 wt% and olive oil surfactant used to enhance colloidal stability, was tested and compared to the results obtained for the base fluid and the base fluid/stabiliser mixture employing their experimentally measured thermo-physical properties. The nanofluid generally enhanced the convective heat transfer coefficient in relation to the base fluid with enhancements of up to 7.23% at 200 °C and 9.43% at 140 °C vs. the pure base fluid.
Highlights
The number of processes that involve heat transfer in the world today is outstanding, and range from chemical or oil/gas industries to the solar thermal energy sector, including the cooling of electronic devices, chemical and nuclear reactors, engines, etc
The differences between the experimental values measured in the loop and the theoretical ones obtained from the cor relations are higher than in the previous case Fig. 5a), which corrobo rates that using the experimental measurements of the thermo-physical properties for heat transfer determinations is recommended
The setup consists of a thermohy draulic loop that simulates the common working conditions for heat transfer fluids (HTF) based on thermal oils
Summary
The number of processes that involve heat transfer in the world today is outstanding, and range from chemical or oil/gas industries to the solar thermal energy sector, including the cooling of electronic devices, chemical and nuclear reactors, engines, etc. This is one of the reasons why the heat transfer fluids (HTFs) market is expected to continue to grow in forthcoming years [1,2]. Enhancing heat transfer by modifying HTFs can be achieved by directly replacing the working fluid with a more suitable one, which is not al ways easy, or by adding dispersed particles to the original fluid to create what is known as a nanofluid [5,6]
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