Hybrid thermionic-photovoltaic converter

Datas, Alejandro

doi:10.1063/1.4945712

Cited by 74 publications

(48 citation statements)

References 13 publications

(16 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The net heat flow q n from the emitter to the PV cell can be expressed as [22][23][24] q n 5q t 2q r 5 The incident photons with energy over the band-gap energy are absorbed by the PV cell to generate power output.…”

Section: Power Output and Efficiency Of A Tpvcmentioning

confidence: 99%

“…The electric current density i generated in the TPVC is given by [22][23][24] i5 2pe The electric current density i generated in the TPVC is given by [22][23][24] i5 2pe…”

Section: Power Output and Efficiency Of A Tpvcmentioning

confidence: 99%

“…The incident photons with energy over the band-gap energy are absorbed by the PV cell to generate power output. The net heat flow q n from the emitter to the PV cell can be expressed as [22][23][24] q n 5q t 2q r 5…”

Section: Power Output and Efficiency Of A Tpvcmentioning

confidence: 99%

“…where A e is the front surface area of the emitter which is equal to the electrode area of the PV cell, e is the elementary charge, K is the Boltzmann constant, E is the photon energy, E g is the bang gap energy of the semiconductor material in the PV cell, h is the Planck constant, c is the speed of light in vacuum, and V is the voltage output. The electric current density i generated in the TPVC is given by [22][23][24] i5 2pe…”

Section: Power Output and Efficiency Of A Tpvcmentioning

confidence: 99%

See 3 more Smart Citations

Parametric optimum design criteria of a thermophotovoltaic cell

Yang

Wang

Chen

et al. 2017

Env Prog and Sustain Energy

View full text Add to dashboard Cite

A new model of the thermophotovoltaic cell (TPVC) including internal and external irreversible losses is proposed. Expressions for the efficiency and power output of the TPVC are analytically derived. The curves of the temperatures of the emitter and the photovoltaic (PV) cell, two heat flows of the TPVC, and current density of the PV cell varying with the voltage output are presented through numerical calculation. The effects of the voltage output of the PV cell and the band gap energy of the semiconductor material in the PV cell on the efficiency and power output are discussed in detail. The maximum efficiency and power output density are calculated. The choice criteria of some key parameters are supplied. The influence of the temperature of the heat source on the performance of the TPVC is revealed. The lower and upper bounds of the optimized parameters are determined. The results obtained here may provide some theoretical guidance for the optimal design of practical TPVCs. © 2017 American Institute of Chemical Engineers Environ Prog, 37: 513–517, 2018

show abstract

Section: Power Output and Efficiency Of A Tpvcmentioning

confidence: 99%

“…The electric current density i generated in the TPVC is given by [22][23][24] i5 2pe The electric current density i generated in the TPVC is given by [22][23][24] i5 2pe…”

Section: Power Output and Efficiency Of A Tpvcmentioning

confidence: 99%

Section: Power Output and Efficiency Of A Tpvcmentioning

confidence: 99%

Section: Power Output and Efficiency Of A Tpvcmentioning

confidence: 99%

See 2 more Smart Citations

Parametric optimum design criteria of a thermophotovoltaic cell

Yang

Wang

Chen

et al. 2017

Env Prog and Sustain Energy

View full text Add to dashboard Cite

show abstract

“…Other technological options exist though; such as thermophotovoltaics (TPV) [9], [10], thermionic [11] or hybrid thermionic-photovoltaic [12] devices that do not require HTFs and consequently have the potential to operate at extraordinary high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Ultra high temperature latent heat energy storage and thermophotovoltaic energy conversion

Datas

Ramos

Martı́

et al. 2016

Energy

115

View full text Add to dashboard Cite

A conceptual energy storage system design that utilizes ultra high temperature phase change materials is presented. In this system, the energy is stored in the form of latent heat and converted to electricity upon demand by TPV (thermophotovoltaic) cells. Silicon is considered in this study as PCM (phase change material) due to its extremely high latent heat (1800 J/g), melting point (1410ºC), thermal conductivity (~25 W/m-K), low cost (less than $2/kg or $4/kWh) and abundance on earth. The proposed system enables an enormous thermal energy storage density of ~ 1 MWh/m 3 , which is 10-20 times higher than that of lead-acid batteries, 2-6 times than that of Li-ion batteries and 5-10 times than that of the current state of the art TES systems utilized in CSP (concentrated solar power) applications. The discharge efficiency of the system is ultimately determined by the TPV converter, which theoretically can exceed 50%. However, realistic discharge efficiencies utilizing single junction TPV cells are in the range of 20-45%, depending on the semiconductor bandgap and quality, and the photon recycling efficiency. This concept has the potential to achieve output electric energy densities in the range of 200-450 kWh e /m 3 , which is comparable to the best performing state of the art Lithium-ion batteries.

show abstract

Progress Toward High Power Output in Thermionic Energy Converters

Campbell

Celenza

Schmitt³

et al. 2021

Advanced Science

View full text Add to dashboard Cite

Thermionic energy converters are solid‐state heat engines that have the potential to produce electricity with efficiencies of over 30% and area‐specific power densities of 100 Wcm−2. Despite this prospect, no prototypes reported in the literature have achieved true efficiencies close to this target, and many of the most recent investigations report power densities on the order of mWcm−2 or less. These discrepancies stem in part from the low‐temperature (<1300 K) test conditions used to evaluate these devices, the large vacuum gap distances (25–100 µm) employed by these devices, and material challenges related to these devices' electrodes. This review will argue that, for feasible electrode work functions available today, efficient performance requires generating output power densities of >1 Wcm−2 and employing emitter temperatures of 1300 K or higher. With this result in mind, this review provides an overview of historical and current design architectures and comments on their capacity to realize the efficiency and power potential of thermionic energy converters. Also emphasized is the importance of using standardized efficiency metrics to report thermionic energy converter performance data.

show abstract

Hybrid thermionic-photovoltaic converter

Cited by 74 publications

References 13 publications

Parametric optimum design criteria of a thermophotovoltaic cell

Parametric optimum design criteria of a thermophotovoltaic cell

Ultra high temperature latent heat energy storage and thermophotovoltaic energy conversion

Progress Toward High Power Output in Thermionic Energy Converters

Contact Info

Product

Resources

About