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1. An endurable watt-power Bi2Te3-based terrestrial radioisotope thermoelectric generator harvesting decay energy for IoT-based sensors in extreme environments | |||
Deng Wei,Wang Xuejian,Pan Xiaodong,Zhang Shixu,Ding Jingjie,Li Gongping | |||
Energy Science and Technology 02 February 2020 | |||
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Abstract:Radioisotope thermoelectric generator (RTG), a technology that mostly adopted in space missions, is regarded as a promising technology to power the Internet of Things-based (IoT) sensors, especially those in extreme environments, for its merits of stability, maintenance-free and long-life. This paper studied RTG\'s application on earth and fabricated an endurable watt-power Bi2Te3-based terrestrial RTG. By employing the finite element analysis, an octagonal cylinder-shaped substituted electric heater was designed to have a higher surface temperature and better temperature uniformity while the fin-shaped radiators to dissipate heat at their optimal heat-sinking capacity. In the experiment part, this terrestrial RTG was tested to have an output power of 4.64 W and an open-circuit voltage of 27.2 V. Also, an optimal electric connection instruction between each thermoelectric (TE) converter was proposed from the experiment. Whereafter, based on the structure used in the experiment part, the finite element analysis was carried out to optimize the geometry of TE converters, the terrestrial RTG possessed an enhanced output power of 10.5 W with an open-circuit voltage of 57.8 V. Ultimately, this paper proposed important guidance for the design and optimization of an endurable terrestrial RTG, which could provide some prospects for its application on IoT-based sensors. | |||
TO cite this article:Deng Wei,Wang Xuejian,Pan Xiaodong, et al. An endurable watt-power Bi2Te3-based terrestrial radioisotope thermoelectric generator harvesting decay energy for IoT-based sensors in extreme environments[OL].[ 2 February 2020] http://en.paper.edu.cn/en_releasepaper/content/4750596 |
2. Electricity and hydrogen co-production from methanol via an electrochemical cell | |||
FANG Xiaowen,CHEN Qingyun,CAI Wenfang,WANG Yunhai | |||
Energy Science and Technology 05 December 2015 | |||
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Abstract:In the present research, a new technology was developed to produce hydrogen and electricity simultaneously from methanol. The process was performed by an electrochemical cell which is composed of a Pt-Ru/C anode, a platinum foil cathode and a bipolar membrane to separate the anode and cathode chambers. In the designed electrochemical cell, hydrogen can be produced on cathode while methanol can be oxidized on anode, respectively with additional electricity production. The hydrogen and electricity production performance in the cell was evaluated. The effect of anode surface area on hydrogen production rate and power output was also investigated. With anode apparent surface area of 6.15 cm2 , hydrogen production rate can reach up to 0.76 m3H2 m-3 d-1 and the maximum power density of 0.42 W m-2 could be achieved, respectively. | |||
TO cite this article:FANG Xiaowen,CHEN Qingyun,CAI Wenfang, et al. Electricity and hydrogen co-production from methanol via an electrochemical cell[OL].[ 5 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4669418 |
3. Experimental Study of Complicated Phase Change Heat Transfer in Confined Space | |||
ZHANG Guangmeng,LIU Zhongliang | |||
Energy Science and Technology 05 March 2013 | |||
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Abstract:The experimental results of complicated phase change heat transfer characteristics in confined space are presented. The working medium used is de-ionized water, the heating and cooling surfaces are polished copper. The confined space is a closed chamber that consists of a heating copper block whose top surface is used for boiling, a cooling copper block whose bottom surface is used for condensing and a circular wall made of stainless steel. The distance between the heating and cooling surfaces of the confined chamber is 26 mm, and the water layer thickness in the chamber is set at 10 mm, 12 mm, 14 mm and 16 mm, respectively. Experimental observation and results show that boiling and condensation processes are strongly inter-related and have significant influences over each other. As the water level increases, the boiling heat transfer coefficient increases at first and then decreases. Analysis of the standard deviations of the confined space pressure shows that as the heat flux increases, the pressure fluctuation increases first and then tends to maintain a constant. The experimental results also disclose that there exists an optimum water filling amount at which both the boiling and the condensation heat transfer coefficient acquire their maximum value. | |||
TO cite this article:ZHANG Guangmeng,LIU Zhongliang. Experimental Study of Complicated Phase Change Heat Transfer in Confined Space[OL].[ 5 March 2013] http://en.paper.edu.cn/en_releasepaper/content/4524923 |
4. Effect of Froude number on entropy generation in separated flow | |||
CHEN Sheng | |||
Energy Science and Technology 04 February 2012 | |||
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Abstract:Flow over a backward facing step (BFS) has been taken as a useful prototype to investigate characteristics of separated flow. However, to date the study on the effect of Froude number on entropy generation over BFS is absent yet although the flow pattern and heat transfer characteristic both would receive significant influence caused by variation of Froude number in many practical applications, for example in microelectromechanical systems and aerocrafts. In this paper, the effect of Froude number on entropy generation in BFS flow is reported for the first time. It is found that the distributions of local entropy generation number and Bejan number are significantly influenced by the variation of Froude number. | |||
TO cite this article:CHEN Sheng. Effect of Froude number on entropy generation in separated flow[OL].[ 4 February 2012] http://en.paper.edu.cn/en_releasepaper/content/4465026 |
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