Efficiency Limit of Molecular Solar Thermal Energy Collecting Devices
Efficiency Limit of Molecular Solar Thermal Energy Collecting Devices
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DOI：
10.1021/sc300107z
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发表时间：
2013-06-01
影响因子：
8.4
通讯作者：
Moth-Poulsen, Kasper
中科院分区：
文献类型：
--
作者：
Borjesson, Karl;Lennartson, Anders;Moth-Poulsen, Kasper
随着太阳能等可再生能源在能源中所占比例越来越大，储能和转换技术也变得越来越重要，分子太阳能(MOST)是一种将太阳能长期储存在分子中并以热的形式释放出来，随着初始材料的充分再生，这个过程本质上是封闭循环和零排放的过程。目前还没有对这项技术的基本效率极限进行评估。本文讨论了分子太阳能热系统的效率极限和分子设计的基本因素。最大效率和潜在的温度梯度是使用一些关于期望的存储寿命和能量损失的基本假设来估计的。在S-1-S-0间隙为1.89 eV时，预测的最大太阳能转换效率为10.6%。在这个S-1-S-0间隙，存储的能量能够产生类似于300摄氏度的温差。几个现有系统的能量存储密度与预测的最大值一致，但在大于最佳S-1-S-0间隙的情况下这样做。
As a larger fraction of energy is based on solar energy an other renewable energy sources, technologies for energy storage and conversion is becoming, increasingly important Molecular solar thermal (MOST) is a concept for long-term storage of solar energy in molecules and release of the energy as heat with full regeneration of the initial materials The process is inherently closed cycle and emission free. No assessment of the fundamental efficiency limits of the technology has been made. In this report, I efficiency limits and fundamental factors for molecular design of molecular solar thermal systems are discussed. Maximum efficiencies and potential temperature gradients are estimated using a number of basic assumptions on desired storage lifetimes and energy losses. The predicted maximum solar energy conversion efficiency is 10.6% at a S-1-S-0 gap of 1.89 eV. At this S-1-S-0 gap, the stored energy is able to create temperature differences of similar to 300 degrees C. Several existing systems have an energy storage density in line with the predicted maximum one but do so at larger than optimal S-1-S-0 gaps.