The Experts below are selected from a list of 4104 Experts worldwide ranked by ideXlab platform
Andrew A. O. Tay - One of the best experts on this subject based on the ideXlab platform.
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numerical analyses on optimizing a heat pipe thermal management system for lithium ion batteries during fast charging
Applied Thermal Engineering, 2015Co-Authors: Lip Huat Saw, Yixiang Shi, Andrew A. O. TayAbstract:Abstract Thermal management is crucial for the operation of electric vehicles because lithium ion batteries are vulnerable to excessive heat generation during fast charging or other severe scenarios. In this work, an optimized heat pipe thermal management system (HPTMS) is proposed for fast charging lithium ion battery cell/pack. A numerical model is developed and comprehensively validated with experimental results. This model is then employed to investigate the thermal performance of the HPTMS under steady state and transient conditions. It is found that a cylinder vortex generator placed in front of the heat pipe condensers in the coolant stream improves the temperature uniformity. The uses of cooper heat spreaders and Cooling Fins greatly improve the performance of the thermal management system. Experiments and transient simulations of heat pipe thermal management system integrated with batteries prove that the improved HPTMS is capable for thermal management of batteries during fast charging. The air-cooled HPTMS is infeasible for thermal management of batteries during fast charging at the pack level due to the limitation of low specific heat capacity.
Kia Hock Tan - One of the best experts on this subject based on the ideXlab platform.
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Heat spreading and heat transfer coefficient with fin heat sink
Applied Thermal Engineering, 2017Co-Authors: K.s. Ong, C.f. Tan, Koon Chun Lai, Kia Hock TanAbstract:Abstract Compact high powered semiconductor chips require greater heat dissipation and more effective thermal Cooling systems have to be devised such as incorporating vapor chambers and thermoelectric. As a first step, the performance of two conventional fin heat sinks with flat metal base and an array of Cooling Fins on top are determined under force and natural convection air Cooling and with various heating power input. Fin temperatures and heat transfer coefficients were determined for different size heating elements producing different area aspect ratios. This paper reports on the effect of thermal heat spreading effect and determination of the thermal heat spreading resistance. Heat spreading and contact resistances are small compared to the thermal resistance of the FHS itself.
K Y Leong - One of the best experts on this subject based on the ideXlab platform.
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an experimental investigation on performance analysis of air type photovoltaic thermal collector system integrated with Cooling Fins design
Energy and Buildings, 2016Co-Authors: Juwel Chandra Mojumder, W T Chong, K Y LeongAbstract:Abstract Photovoltaic thermal (PV/T) system was introduced to meet the thermal and electrical energy. The heat removal by air or water prevents the deterioration of the PV cell efficiency due to the overheating of cells. In this study, an air type single pass PV/T collector system was proposed where a number of thin rectangular Fins were introduced for heat dissipation. The collector’s performance was analyzed with a fin system that was integrated by a thin flat metallic sheet (TFMS). Then, the temperature parameters were measured and compared to several operating conditions and configurations. Analytical expression was derived from the energy balance equations for each component of the design. Average temperatures from the top/rear PV surfaces, the collector back wall surface and the collector inlet/outlet temperatures were experimentally recorded under different fin numbers (0–4), mass flow rates (0.02 kg/s–0.14 kg/s) and solar radiations (200 W/m2–700 W/m2). These readings were used in calculating the thermal and electrical efficiency of the proposed PV/T system. The maximum thermal efficiency and PV efficiency were obtained about 56.19% and 13.75% respectively for four Fins at 0.14 kg/s of mass flow rate and 700 W/m2 of solar radiation. Besides, the root mean square percentages of deviation (e) and coefficient of correlation (r) were used to validate the result while also discussing the uncertainty values. This research will be helpful to design thermal collectors and provide valuable information regarding performance improvement methods in PV/T systems.
Simon Weingaertner - One of the best experts on this subject based on the ideXlab platform.
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numerical investigations of solar cell temperature for photovoltaic concentrator system with and without passive Cooling arrangements
International Journal of Thermal Sciences, 2011Co-Authors: Sendhil Kumar Natarajan, Tapas K Mallick, Matty Katz, Simon WeingaertnerAbstract:Abstract The numerical study of solar cell temperature for concentrating PV with concentration ratio of 10× is presented in this paper. A two dimensional thermal model has been developed to predict the temperature for PV concentrator system (solar cell and lens) with and without passive Cooling arrangements. Based on a thermal model, the result shows that maximum of four numbers of uniform Fins of 5 mm height and 1 mm thickness can be effectively used to reduce the solar cell temperature. In addition to that, the effects of ambient temperature and solar radiation intensity on the solar cell temperature have also been investigated for the system with and without Cooling Fins. Based on the influencing parameters of ambient temperature and solar radiation, two separate solar cell temperature correlations has been proposed for systems with and without Cooling Fins to predict the cell temperature for the range of given parameters. In our previous studies, the present 2-D model was extensively validated with a comprehensive unified model [8] , [9] , [10] .
Lip Huat Saw - One of the best experts on this subject based on the ideXlab platform.
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numerical analyses on optimizing a heat pipe thermal management system for lithium ion batteries during fast charging
Applied Thermal Engineering, 2015Co-Authors: Lip Huat Saw, Yixiang Shi, Andrew A. O. TayAbstract:Abstract Thermal management is crucial for the operation of electric vehicles because lithium ion batteries are vulnerable to excessive heat generation during fast charging or other severe scenarios. In this work, an optimized heat pipe thermal management system (HPTMS) is proposed for fast charging lithium ion battery cell/pack. A numerical model is developed and comprehensively validated with experimental results. This model is then employed to investigate the thermal performance of the HPTMS under steady state and transient conditions. It is found that a cylinder vortex generator placed in front of the heat pipe condensers in the coolant stream improves the temperature uniformity. The uses of cooper heat spreaders and Cooling Fins greatly improve the performance of the thermal management system. Experiments and transient simulations of heat pipe thermal management system integrated with batteries prove that the improved HPTMS is capable for thermal management of batteries during fast charging. The air-cooled HPTMS is infeasible for thermal management of batteries during fast charging at the pack level due to the limitation of low specific heat capacity.