What is it about?
This study examines the design of heat exchanger made of copper tube for cooling electric vehicle car battery system and the effects of base fluid and nano-fluid (as coolants) channeling inside the heat exchanger to increase heat transfer between the compartment of the electric vehicle car and the heat exchanger and comparison between them. The nano-fluid (CuO/pure water) was prepared by dispersing a nanoparticle (CuO) in base fluid (pure water). Nano-fluid (CuO/pure water) with a nominal diameter of 50 nm at volume concentrations (0.27 Vol. %) at batteries’ compartment temperature was used for these investigations. The analysis showed that secondary cooling system by means of nano-fluid (CuO/pure water) has advantages in improving the thermal conductivity and heat transfer coefficient, better from base fluid (pure water) also in Nusselt number. This results work on reducing the electric power loss in the form of thermal energy from batteries. This led to increase in the efficiency of the electric vehicle car battery, hence also improved the performance of the EV car and battery lifetime.
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Why is it important?
This study found that the heat transfer rate improvement is attained by using 50 nm diameter of nanoparticles dispersed in pure water with volume concentrations of 0.27 % of nano-fluid (CuO/pure water) in heat exchangers, when processed under the laminar flow. Analytical results showed the following: 1- The thermal conductivity of nano-fluid (CuO/pure water) improved 6 % compared to base fluid (pure water). 2- The heat transfer coefficient of nano-fluid (CuO/pure water) improved 62% compared to base fluid (pure water). 3- The heat transfer rate of nano-fluid (CuO/pure water) improved 49.2 % compared to base fluid (pure water). These conditions are due to several reasons, including: 1. The nano-particles provide very high surface areas to heat transfer and therefore increase the heat transfer and also increase the heat removal capacity from surrounding medium. 2. The volume concentration of nanoparticles (CuO) is paramount with respect to nano-fluid thermophysical properties that lead to increase the thermal efficiency with increasing volume concentration.
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This page is a summary of: The Performance of a Heat Exchanger Designed for Cooling Electric Vehicle Car Battery System by Use Base Fluid and Nano-Fluid, Applied Mechanics and Materials, September 2015, Trans Tech Publications,
DOI: 10.4028/www.scientific.net/amm.793.573.
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