Topic
Power density
About: Power density is a research topic. Over the lifetime, 9534 publications have been published within this topic receiving 197264 citations. The topic is also known as: volumic power & volume power density.
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TL;DR: In this article, a wide range of pulsed laser welding parameters were identified, including average peak power density (APPD), peak power, mean laser power, traverse speed, pulse repetition rate, duty cycle, pulse energy, spot size, and pulse duration.
Abstract: A wide range of pulsed laser welding parameters was identified. These include average peak power density (APPD), peak power, mean laser power, traverse speed, pulse repetition rate, duty cycle, pulse energy, spot size, and pulse duration. The type of laser beam temporal pulse shape studied was a rectangular power pulse. The effects of pulsed laser welding parameters on heat flow, weld dimension, and weldability are investigated. The study shows that weld quality is principally affected by APPD, mean power, and traverse speed, of which APPD is the most critical process parameter. A processing map containing the APPD effects is constructed as a guide for producing good welds.
79 citations
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TL;DR: In this article, an activated carbon coated membrane is designed to decrease the internal resistance of the zinc/bromine flow battery, and the energy efficiency of 75% is achieved at charge-discharge current density of 40 mA cm(-2), which means a nearly two-fold increase in power density.
79 citations
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14 Mar 1999
TL;DR: In this article, the reliability aspects of module integrated power converters (MICs) for grid-connected photovoltaic power applications are discussed, and a low profile design of a MIC has almost twice the power density and a 70% longer lifetime than commercially available MICs.
Abstract: This paper deals with reliability aspects of module integrated power converters (MIC) for grid-connected photovoltaic power applications. The presented "low profile design" of a MIC has almost twice the power density and a 70% longer lifetime than commercially available MICs. In order to miniaturise and increase the reliability of the MIC, all magnetic components have been realised using planar cores and windings integrated into the PCB. Additionally, the power converter's resonant inductor has been integrated into the transformer by using the leakage inductance as the inductor. The leakage inductance of planar transformers with integrated windings can be adjusted very precisely.
79 citations
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TL;DR: In this article, the effect of electrolyte and electrode materials, electrolyte thicknesses and operating temperatures on the performance of direct ammonia fuel cells are studied and discussed comparatively for evaluation purposes.
Abstract: In this study, we present a comparative assessment of direct ammonia fuel cells and a discussion of these from various perspectives by considering the effective criteria. The effect of electrolyte and electrode materials, electrolyte thicknesses and operating temperatures on the performance of direct ammonia fuel cells are studied and discussed comparatively for evaluation purposes. A comparison of which cell types and configurations provide the optimum performance is conducted by utilizing the experimental results reported in the literature. The results of this study are expedient to provide important inferences about the performances of direct ammonia fuel cells. Ammonia fed oxygen ion conducting Samarium doped ceria electrolyte based solid oxide fuel cells have comparatively the highest peak power density of 1190 mW/cm2 when operated at 650 °C with a 10 µm thick electrolyte. Direct ammonia proton conducting electrolyte based solid oxide fuel cells have lower cell performance than oxygen ion conducting fuel cells due to the dilution of hydrogen at the anode by undecomposed ammonia as well as formed nitrogen gas. The operating temperature of the fuel cell and electrolyte thickness affect the cell performance considerably. A 200 °C increase in operating temperature increases the peak power density by nearly three to four times for ammonia fed solid oxide fuel cells. The molten alkaline electrolyte based fuel cells can be a promising technology. Further research is required for these type of fuel cells to investigate their performance with low electrode separation distance and more conductive alkaline electrolytes.
79 citations
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TL;DR: This paper presents the constructions and some electrical and thermomechanical analyses of four 3-D packaging approaches that have been developed within the Center for Power Electronics Systems-an NSF Engineering Research Center.
Abstract: Demands for increasing power density and levels of functional integration in switch-mode power converters require power electronics manufacturers to develop innovative packaging solutions for power semiconductor devices and modules. Three-dimensional (3-D) packaging techniques offer the potential of lower resistance, higher current handling capability, smaller volume, better thermal management capability, and high reliability. In this paper, we present the constructions and some electrical and thermomechanical analyses of four 3-D packaging approaches that have been developed within the Center for Power Electronics Systems-an NSF Engineering Research Center.
79 citations