Nanoengineered Surfaces for Thermal Energy Conversion

15th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications

物理学;能源学

Bhatia, Bikram^1 ; Preston, Daniel J.^1 ; Bierman, David M.^1 ; Miljkovic, Nenad^1 ; Lenert, Andrej^1 ; Enright, Ryan^1 ; Nam, Youngsuk^1 ; Lopez, Ken^1 ; Dou, Nicholas^1 ; Sack, Jean^1 ; Chan, Walker R.^1 ; Celanovi, Ivan^1 ; Soljai, Marin^1 ; Wang, Evelyn N.^1

Massachusetts Institute of Technology, Cambridge

MA, United States^1

关键词: Droplet condensation;    Electrostatic energies;    Enhanced condensation;    Nanostructured surface;    Residual charge;    Superhydrophobic;    System efficiency;    Thermophotovoltaics;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/660/1/012036/pdf
DOI  :  10.1088/1742-6596/660/1/012036

来源: IOP

【 摘 要 】

We provide an overview of the impact of using nanostructured surfaces to improve the performance of solar thermophotovoltaic (STPV) energy conversion and condensation systems. We demonstrated STPV system efficiencies of up to 3.2%, compared to ≤1% reported in the literature, made possible by nanophotonic engineering of the absorber and emitter. For condensation systems, we showed enhanced performance by using scalable superhydrophobic nanostructures via jumping-droplet condensation. Furthermore, we observed that these jumping droplets carry a residual charge which causes the droplets to repel each other mid-flight. Based on this finding of droplet residual charge, we demonstrated electric-field-enhanced condensation and jumping-droplet electrostatic energy harvesting.