Maximal continuous power output and parametric optimum design of an electrochemical system driven by low-grade heat

2017 ◽  
Vol 138 ◽  
pp. 156-161 ◽  
Author(s):  
Yuan Wang ◽  
Ling Cai ◽  
Wanli Peng ◽  
Yinghui Zhou ◽  
Jincan Chen
2021 ◽  
Vol 33 (13) ◽  
pp. 2170096
Author(s):  
Caitian Gao ◽  
Yezhou Liu ◽  
Bingbing Chen ◽  
Jeonghun Yun ◽  
Erxi Feng ◽  
...  

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
Seok Woo Lee ◽  
Yuan Yang ◽  
Hyun-Wook Lee ◽  
Hadi Ghasemi ◽  
Daniel Kraemer ◽  
...  

2021 ◽  
Vol 33 (13) ◽  
pp. 2004717
Author(s):  
Caitian Gao ◽  
Yezhou Liu ◽  
Bingbing Chen ◽  
Jeonghun Yun ◽  
Erxi Feng ◽  
...  

Author(s):  
Matthew Read ◽  
Ian K. Smith ◽  
Nikola Stosic

To obtain the best power output in wet vapour plant used in low grade heat utilisation depends not only on the conflicting requirements of high heat recovery and high working fluid temperatures but also on the dryness fraction of the fluid entering the expander, the screw expander size, rotor profile and speed and built-in volume ratio. It is shown in this paper how the optimisation methods and associated numerical procedures can be used to obtain the best combination of the often conflicting requirements imposed upon the screw expander in order to achieve its target, the maximum power output for given flow of the heating medium and its inlet and outlet temperatures. Measurements are performed with an expander in a steam power plant to obtain experimental results to validate performance estimation used in the optimisation process.


2019 ◽  
Author(s):  
Zhao-Yang Zhang ◽  
Tao LI

Solar energy and ambient heat are two inexhaustible energy sources for addressing the global challenge of energy and sustainability. Solar thermal battery based on molecular switches that can store solar energy and release it as heat has recently attracted great interest, but its development is severely limited by both low energy density and short storage stability. On the other hand, the efficient recovery and upgrading of low-grade heat, especially that of the ambient heat, has been a great challenge. Here we report that solar energy and ambient heat can be simultaneously harvested and stored, which is enabled by room-temperature photochemical crystal-to-liquid transitions of small-molecule photoswitches. The two forms of energy are released together to produce high-temperature heat during the reverse photochemical phase change. This strategy, combined with molecular design, provides high energy density of 320-370 J/g and long-term storage stability (half-life of about 3 months). On this basis, we fabricate high-performance, flexible film devices of solar thermal battery, which can be readily recharged at room temperature with good cycling ability, show fast rate of heat release, and produce high-temperature heat that is >20<sup> o</sup>C higher than the ambient temperature. Our work opens up a new avenue to harvest ambient heat, and demonstrate a feasible strategy to develop high-performance solar thermal battery.


2019 ◽  
Author(s):  
Zhao-Yang Zhang ◽  
Tao LI

Solar energy and ambient heat are two inexhaustible energy sources for addressing the global challenge of energy and sustainability. Solar thermal battery based on molecular switches that can store solar energy and release it as heat has recently attracted great interest, but its development is severely limited by both low energy density and short storage stability. On the other hand, the efficient recovery and upgrading of low-grade heat, especially that of the ambient heat, has been a great challenge. Here we report that solar energy and ambient heat can be simultaneously harvested and stored, which is enabled by room-temperature photochemical crystal-to-liquid transitions of small-molecule photoswitches. The two forms of energy are released together to produce high-temperature heat during the reverse photochemical phase change. This strategy, combined with molecular design, provides high energy density of 320-370 J/g and long-term storage stability (half-life of about 3 months). On this basis, we fabricate high-performance, flexible film devices of solar thermal battery, which can be readily recharged at room temperature with good cycling ability, show fast rate of heat release, and produce high-temperature heat that is >20<sup> o</sup>C higher than the ambient temperature. Our work opens up a new avenue to harvest ambient heat, and demonstrate a feasible strategy to develop high-performance solar thermal battery.


2021 ◽  
Vol 2 (2) ◽  
pp. 021304
Author(s):  
Hang Zhang ◽  
Qing Wang
Keyword(s):  

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1827
Author(s):  
Mengyao Li ◽  
Yu Zhang ◽  
Ting Zhang ◽  
Yong Zuo ◽  
Ke Xiao ◽  
...  

The cost-effective conversion of low-grade heat into electricity using thermoelectric devices requires developing alternative materials and material processing technologies able to reduce the currently high device manufacturing costs. In this direction, thermoelectric materials that do not rely on rare or toxic elements such as tellurium or lead need to be produced using high-throughput technologies not involving high temperatures and long processes. Bi2Se3 is an obvious possible Te-free alternative to Bi2Te3 for ambient temperature thermoelectric applications, but its performance is still low for practical applications, and additional efforts toward finding proper dopants are required. Here, we report a scalable method to produce Bi2Se3 nanosheets at low synthesis temperatures. We studied the influence of different dopants on the thermoelectric properties of this material. Among the elements tested, we demonstrated that Sn doping resulted in the best performance. Sn incorporation resulted in a significant improvement to the Bi2Se3 Seebeck coefficient and a reduction in the thermal conductivity in the direction of the hot-press axis, resulting in an overall 60% improvement in the thermoelectric figure of merit of Bi2Se3.


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