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What to do when the sun is not shining. Photovoltaics (PVs) plus batteries plus grid (Gas and coal turbines) backup are expensive. Concentrated solar power (CSP) is considered a “nearly obsolete” technology, yet it is the only technology that is based on a heat engine, that can replace fossil fuel heat engines. In a few consecutive days with poor solarRead More
M-CSP requires a small (<1MW) and efficient (>40%) external-heat engine, not existing today due to thermodynamic considerations. Such an engine will also increase the green hydrogen production capacity factor, which will reduce its cost to the level of gray Hydrogen, and will allow to harvest waste heat. In all heat engines that we know, only gases are used, and forRead More
for winning the 2nd place in the Hackathon on utility-scale energy storage. The team evaluated liquid air technology for seasonal energy storage. Their solution used a solar powered thermoacoustic engine to liquify air at a round trip efficiency (from sun to liquid air and back to electricity) of 15%, comparable to a combined PV + pumped-hydro system. This cost effectiveRead More
for wining the 1st place in the Hackathon on green energy utility scale storage. The team showed how thermochemical storage Ca(OH)2/CaO that has more than 77% energy cycle efficiency (in retrieving heat at 500C) without the need for catalysator. It is also cost effective, non-toxic, stored at room temperature, which is perfect for seasonal storage. Together with our concept forRead More
Planck’s law of thermal radiation depends on the temperature, T, and the emissivity, ε, which is the coupling of heat to radiation depending on both phonon-electron nonradiative-interactions and electron-photon radiative-interactions. In contrast, absorptivity, α, only depends on the electron-photon radiative-interactions. At thermodynamic equilibrium, nonradiative-interactions are balanced, resulting in Kirchhoff’s law of thermal radiation, ε=α. At non-equilibrium, Quantum efficiency (QE) describesRead More
Ideal Light Source – De-coherence without time averaging for high radiance uniform light source Imaging of microscopic structures, photography, and excitation of materials benefit from a uniform and high-power light source. Since lasers are high radiance light sources, they are good candidates for these purposes. However, their high coherence results in speckles; a nonuniform intensity. Spectral Radiance is the thermodynamicRead More
The challenge in solar energy today is not the cost of photovoltaics (PVs) electricity generation, already competing with fossil fuel prices, but rather utility-scale energy storage costs. Alternatively, low-cost thermal energy storage (TES) exists but relies on expensive concentrated solar power (CSP). A technology, able to unify PV conversion and TES, may usher in the era of efficient base-load renewableRead More
To apply thermodynamic principles for developing new optical devices. Including:
- Theoretical study on thermodynamics of radiation.
- Converting inefficient parts of the solar spectrum to wavelengths most efficient for energy-harvesting.
- Conversion of thermal energy to electricity.
- Efficient high power light sources fully integrated on-chip lasers.
We work with Excitonics. localized energy states in small molecules. By engineering the energy dynamics between excitonics we bring the device functionality into the single-molecule level.
Our group is highly multidisciplinary working at the interface between Physics, Thermodynamics, Optics, Materials, and Devices.
Excellent students and researchers in these areas are welcome to contact me.