Thermal energy grid storage using multi-junction photovoltaics (original) (raw)
* Corresponding authors
a Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
E-mail: ase@mit.edu
b George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, USA
c National Renewable Energy Laboratory, Golden, CO, USA
d School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, USA
e Heat Lab, Georgia Institute of Technology, Atlanta, GA, USA
Abstract
As the cost of renewable energy falls below fossil fuels, the key barrier to widespread sustainable electricity has become availability on demand. Energy storage can enable renewables to provide this availability, but there is no clear technology that can meet the low cost needed. Thus, we introduce a concept termed thermal energy grid storage, which in this embodiment uses multi-junction photovoltaics as a heat engine. We report promising initial experimental results that suggest it is feasible and could meet the low cost required to reach full penetration of renewables. The approach exploits an important tradeoff between the realization of an extremely low cost per unit energy stored, by storing heat instead of electricity directly, and paying the penalty of a lower round trip efficiency. To understand why this tradeoff is advantageous, we first introduce a general framework for evaluating storage technologies that treats round trip efficiency, as well as cost per unit energy and power, as variables.
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DOI
https://doi.org/10.1039/C8EE02341G
Article type
Paper
Submitted
10 Aug 2018
Accepted
14 Nov 2018
First published
19 Nov 2018
This article is Open Access
Download Citation
Energy Environ. Sci., 2019,12, 334-343
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Thermal energy grid storage using multi-junction photovoltaics
C. Amy, H. R. Seyf, M. A. Steiner, D. J. Friedman and A. Henry,Energy Environ. Sci., 2019, 12, 334DOI: 10.1039/C8EE02341G
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