scholarly journals Electron Thermionic Emission from Graphene and a Thermionic Energy Converter

2015 ◽  
Vol 3 (1) ◽  
Author(s):  
Shi-Jun Liang ◽  
L. K. Ang
Keyword(s):  
Thermionic Emission ◽  
Energy Converter ◽  
Thermionic Energy

Effects of heat transfer on characteristics of thermionic energy converter

2018 ◽  
Vol 96 (12) ◽  
pp. 1247-1258
Author(s):  
Weiwei Zhu ◽  
Cong Ji ◽  
Fan Gu
Keyword(s):  
Heat Transfer ◽  
Current Density ◽  
Large Scale ◽  
Thermionic Emission ◽  
Electrical Energy ◽  
Output Current ◽  
Energy Converter ◽  
Emitter Temperature ◽  
Output Characteristics ◽  
Thermionic Energy

Photon enhanced thermionic emission (PETE) is a new concept in solar energy conversion, combining thermal and photovoltaic carrier excitations with thermionic emission. A solar-power-driven thermionic energy converter operates by illuminating the solar light condensed by a large-scale Fresnel lens to convert heat energy into electrical energy. By enhancing the efficiency of converting solar radiation into the emitter internal energy, the output power and efficiency of the thermionic energy converter can be greatly improved. In this study, using numerical simulations, the effects of emitter temperature and output characteristics on a thermionic energy converter were investigated. The results showed that the higher rate of the heating power represented the higher temperature of an emitter, as well as output current density, and efficiency. In addition, by reducing the diameter of a collector and thermal conductivity of insulation materials, or increasing the diameter of emitter, the temperature of emitter, output current density, and efficiency could be notably improved. It is also worth mentioning that the main factor that affected the emitter temperature in the process of heat transfer was heat conduction between solids. In conclusion, adequate illumination, reasonable size of collector and emitter, as well as appropriate insulation measurements could efficiently improve the output characteristics of thermionic energy converter.

scholarly journals Mathematical models for thermionic emission current density of graphene emitter

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Olukunle C. Olawole ◽  
Dilip K. De ◽  
Sunday O. Oyedepo ◽  
Fabian I. Ezema
Keyword(s):  
Mathematical Models ◽  
Current Density ◽  
Coefficient Of Thermal Expansion ◽  
Thermionic Emission ◽  
Emission Current Density ◽  
Least Square ◽  
Emission Current ◽  
Two Dimensional Materials ◽  
Current Emission ◽  
Thermionic Energy

AbstractIn this study, five mathematical models were fitted in the absence of space charge with experimental data to find a more appropriate model and predict the emission current density of the graphene-based thermionic energy converter accurately. Modified Richardson Dushman model (MRDE) shows that TEC's electron emission depends on temperature, Fermi energy, work function, and coefficient of thermal expansion. Lowest Least square value of $$S=\sum {\left({J}_{th}-{J}_{exp}\right)}^{2}=0.0002 \,\text{A}^{2}/\text{m}^{4}$$ S = ∑ J th - J exp 2 = 0.0002 A 2 / m 4 makes MRDE most suitable in modelling the emission current density of the graphene-based TEC over the other four tested models. The developed MRDE can be adopted in predicting the current emission density of two-dimensional materials and also future graphene-based TEC response.

Construction of a Thermionic Energy Converter

1960 ◽  
Vol 48 (11) ◽  
pp. 1846-1852 ◽  
Author(s):  
F. Block ◽  
G. Eastman ◽  
F. Corregan ◽  
J. Fendley ◽  
K. Hernqvist ◽  
...  
Keyword(s):  
Energy Converter ◽  
Thermionic Energy
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