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The internal heat and water distributions are critical to performance and lifetime of proton exchange membrane fuel cell (PEMFC). Temperature, relative humidity (RH) and current distributions are investigated by a novel segmented cell based on multi-layered printed circuit board (PCB) flow field plates. The temperature difference between anode and cathode is clearly observed under co-flow and counter-flow...
This letter reports the effect of growth temperature on carrier transport characteristics in heterostructure and demonstrates that hole mobility was enhanced by eliminating a parallel conducting channel in the buffer layers. Based on optimized growth conditions, hole mobility as high as 1220 with carrier concentration...
The aim of the present study is to clarify the thermal performance of the radiant cooling system with Water Flow on Roof, which employs the evaporative cooling effect on the roof surface. In this paper, the thermal performance of this system is discussed from a point of view of the coefficient of performance, using a test house. Measurement results reveal that the indoor globe temperature of the test...
In order to ensure the safe operation of power systems, human pay attention to the diagnosis of heat fault of power system widely. When high-voltage bus bar runs overlade or the contactors of high voltage switches contact badly, the contact resistances will become larger, and it would glow if there is load current. Moreover, the phenomenon will cause insulation, aging and even breakdown; in that case,...
SiC power devices have very promising future because their ultra low conduction and switching losses and ability of working at high temperatures. SiC MOSFET not only has very low switching loss but also shows no degradation in Rdson at 150??C. In order to achieve ultra low switching loss for SiC BJT, a new drive method is proposed and implemented. These characteristics make SiC power MOSFET/BJT devices...
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