Energy scavenging from ultra-low temperature gradients
Energy scavenging from ultra-low temperature gradients
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DOI：
10.1039/c8ee03084g
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发表时间：
2019-03-01
影响因子：
32.5
通讯作者：
Priya, Shashank
中科院分区：
文献类型：
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作者：
Kishore, Ravi Anant;Davis, Brenton;Priya, Shashank
由于日益增加的环境问题，从自然资源和废热中收集热能变得至关重要。然而，到目前为止，可用的热能收集技术只能从大的温度梯度中发电。在这里，我们报告了在低品位热能收集方面的根本性突破，并展示了一种基于热磁效应的装置，该装置使用环境条件作为散热器，并在低至24摄氏度的温度下从热源运行。该概念可以在接近室温的情况下将低至2摄氏度的温度梯度转换为电能。该器件在温差为2℃时的功率密度（活性物质单位体积的功率）为105 W cm(-3)，在温差为10℃时增加到465 W cm(-3)，在风速为2.0 m s（-1）的情况下，功率密度增加2.5倍。热能收集技术的进步将对可再生能源发电和减少全球变暖产生变革性影响。
Thermal energy harvesting from natural resources and waste heat is becoming critical due to ever-increasing environmental concerns. However, so far, available thermal energy harvesting technologies have only been able to generate electricity from large temperature gradients. Here, we report a fundamental breakthrough in low-grade thermal energy harvesting and demonstrate a device based on the thermomagnetic effect that uses ambient conditions as the heat sink and operates from a heat source at temperatures as low as 24 degrees C. This concept can convert temperature gradients as low as 2 degrees C into electricity while operating near room temperature. The device is found to exhibit a power density (power per unit volume of active material) of 105 W cm(-3) at a temperature difference of 2 degrees C, which increases to 465 W cm(-3) at a temperature difference of 10 degrees C. The power density increases by 2.5 times in the presence of wind with a speed of 2.0 m s(-1). This advancement in thermal energy harvesting technology will have a transformative effect on renewable energy generation and in reducing global warming.