Ryan S. Eriksen

Performance Analysis of Electrodynamic Screens Based on Residual Particle Size Distribution

Dust accumulation on the optical surfaces of solar collectors causes significant losses in their energy yield. Fine dust particles, compared with coarse ones, contribute significantly more in the performance loss, assuming identical surface mass concentration. This study examines the performance of different electrodynamic screen (EDS) prototypes, operated under different conditions, in removing fine dust particles in the laboratory environment. After going through several cycles of dust deposition and cleaning using EDS, the dust residue left on each EDS prototype is collected and analyzed using a Horiba particle size distribution (PSD) analyzer. The PSD analyses determine which EDS design has performed superior in removing a given size range and in which operational condition. The results are advantageous in the optimization procedure of EDS to attain maximum dust removal efficiency and minimum optical interference.

Mitigation of dust impacts on solar collectors by water-free cleaning with transparent electrodynamic films: Progress and challenges

Energy-yield loss caused by soiling of photovoltaic modules and concentrated solar power (CSP) mirrors in utility-scale power plants installed in semiarid lands and deserts would result in unsustainable demands for fresh water needed for cleaning. This paper reviews the progress of the electrodynamic screen (EDS) film technology for frequent water-free cleaning with low-energy requirements. Results presented here, based on laboratory-scale EDS-film-laminated solar panel cleaning, show that the output power can be restored higher than 95% of the initial power under clean conditions. For solar mirrors, the specular reflection efficiency can be maintained over 90% ensuring high efficiency of the CSP plants. Operation of the EDS film for maintaining high optical efficiency of solar collectors requires less than 0.2 Wh/m

Analysis of particle size distribution of residual dust in cleaning process using an electrodynamic screen

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H2-H2O Effective Binary Diffusivity Measurement in Solid Oxide Fuel Cell Anode Using an Electrochemical Cell

/cleaning cycle. Principles, optical modeling, construction, lamination of the EDS films on modules and mirrors, and experimental data showing optical efficiency restoration without water consumption are presented. Current challenges in developing electrodes that would meet optical and conduction properties, low-cost production, and meeting long-term outdoor durability of the EDS films are discussed.Energy-yield loss caused by soiling of the PV modules and CSP mirrors in utility-scale power plants would result in unsustainable demands for fresh water needed for cleaning. This paper reviews the progress of the electrodynamic screen (EDS) film technology for frequent water-free cleaning with low energy requirements. EDS-based cleaning would maintain high optical efficiency ensuring long-term sustainability of TW-scale plants located in arid lands. Principles, modeling, construction, and lamination of the EDS films on modules and mirrors and experimental data showing power output restoration are presented. Current challenges in production and meeting outdoors durability of the EDS films are discussed.

Out-of-cell measurements of H2–H2O effective binary diffusivity in the porous anode of solid oxide fuel cells (SOFCs)

Dust accumulation on the optical surfaces of solar collectors causes significant losses in their energy yield. Fine dust particles, compared to coarse ones, contribute significantly more in the performance loss, assuming identical dust concentration density. This study examines the performance of different electrodynamic screen (EDS) prototypes, operated in different conditions, in removing fine dust particles in the laboratory environment. After going through several cycles of dust deposition and cleaning using EDS, the dust residue left on each EDS prototype is collected and analyzed using a Horiba particle size distribution analyzer. The particle size distribution (PSD) analyses determine which EDS design has performed superior in removing a given size range and in which operational condition. The results are advantageous in the optimization procedure of EDS to attain maximum dust removal efficiency and minimum optical interference.

LSM Protective Coatings on Stainless Steel as Interconnects for Solid Oxide Fuel Cells

The effective binary diffusivity of H2 and H2O in a Ni and yittria-stabilized zirconia (YSZ) anode of the solid oxide fuel cells (SOFCs) was measured between 650 and 800oC using an electrochemical cell consisting of an oxygen pump, an oxygen sensor, and a porous SOFC anode pellet. The effective binary diffusivity was obtained from the relationship between the current density across the oxygen pump, and the H2 partial pressure gradient across the anode sample measured using the oxygen sensor. The anode limiting current density and concentration polarization were estimated using the experimental results.