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Title:	Heat transfer characteristics of liquid cold plate with an oblique fins using nanofluids for battery thermal management
Authors:	Nur Irmawati Om (P81556)
Supervisor:	Rozli Zulkifli, Prof. Ir. Dr.
Keywords:	Universiti Kebangsaan Malaysia -- Dissertations Dissertations, Academic -- Malaysia Heat transfer Cold plate Nanofluids Battery thermal management
Issue Date:	20-Feb-2020
Description:	The effects of global climate change have opened up commercial possibilities for new and innovative green technologies. Due to the public's awareness on green mode of transportation, the electric vehicle (EV) is now rapidly growing. This EV technology would offer transportation which are more environmentally friendly as compared to internal combustion engine (ICE) vehicles. One of the key factors that could help increase the performance of EV lies in the improvements on battery systems. Through proper thermal management of batteries, the performance of the EV can thus be improved. The battery tends to generate significant amount of heat due to internal resistance occuring during operation. The heat generated during the charge and discharge processes could lead to overheating which contributes to battery failure. Therefore, the application of thermal management system is essential to dissipate the heat generated in the battery pack to ensure the battery could operate within a safe temperature range. This study aims to improve the thermal management of the battery by introducing liquid cold plate (LCP) with an oblique fin and utilizing nanofluid as a new working fluid. Firstly, experimental setup and procedures were designed and fabricated for the measurement of the surface temperature of the battery. Secondly, in order to offer an insight into the fluid flow and heat transfer characteristic of the LCP, a 3D computational model of the LCP was developed using the ANSYS-Fluent software. The objective of the study is to investigate the effects of geometrical parameter of the oblique fin such as oblique fin arrangement, oblique angle and secondary channel width. There are three different oblique fin arrangements which are inline, incline and louvered with the oblique angle of 15 , 30 and 45 and the secondary channel width of 2 mm, 4 mm and 6 mm. In addition, the effects of four different types of nanofluids such as Al2O3-EG, SiO2-EG, TiO2-EG and CuO-EG with nanoparticle volume fraction range of 1 to 4 and the nanoparticle diameter range of 30 nm to 70 nm were examined. On top of that, the effects of flow regime was also investigated. The results indicated that the louvered arrangement provided the lowest surface temperature of the battery. The louvered arrangement of oblique fin with smaller oblique angle and larger secondary channel width could reduce the surface temperature of the battery and subsequently enhanced the thermal performance of the LCP. In addition to that, it was found that the Al2O3- EG nanofluid had a lower surface temperature of the battery and highest heat transfer performance as compared to pure EG. The simulation results showed that SiO2-EG nanofluid had the lowest surface temperature of the battery and the highest Nusselt number as compared to other types of nanofluids. Furthermore, the surface temperature of the battery decreased and the Nusselt number increased as the nanoparticle volume fraction increases and the nanoparticle diameter decreases. The simulation results also showed that the turbulent flow obtained the lowest surface temperature of the battery and the highest Nusselt number as compared to laminar flow. Overall, the present novel LCP with an oblique fin could ensure that the battery operated within the permitted working temperature of 50 C.,Ph.D.
Pages:	203
Publisher:	UKM, Bangi
Appears in Collections:	Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina

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