Temperature gradient and transport of heat and charge in a semiconductor structure

Abstract Research in termoacoustics began with the observation of the heat transfer between gas and solids. Using this interaction the intense sound wave could be applied to create engines and heat pumps. The most important part of thermoacoustic devices is a regenerator, where press of conversion of sound energy into thermal or vice versa takes place. In a heat pump the acoustic wave produces the temperature difference at the two ends of the regenerator. The aim of the paper is to find the influence of the material used for the construction of a regenerator on the properties of a thermoacoustic heat pump. Modern technologies allow us to create new materials with physical properties necessary to increase the temperature gradient on the heat exchangers. The aim of this paper is to create a regenerator which strongly improves the efficiency of the heat pump.

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Changes of the Amino Acid and Catechins Contents of ‘Kemsull’ and ‘Yabukita’ Tea Cultivars with Different Harvesting Seasons and Developmental Stages in the Temperature Gradient Plastic Film Tunnel under 30% Shading

The Korean Tea Society ◽

10.29225/jkts.2020.26.3.27 ◽

2020 ◽

Vol 26 (3) ◽

pp. 27-38

Author(s):

Doo-Gyung Moon ◽

So Jin Lee ◽

Yong Hee Kwon ◽

Su Young Kang ◽

Seong-Mun Lee

Keyword(s):

Amino Acid ◽

Temperature Gradient ◽

Developmental Stages ◽

Plastic Film

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Field distribution in polymeric MV-HVDC model cable under temperature gradient. Simulation and space charge measurements

European Journal of Electrical Engineering ◽

10.3166/ejee.17.307-325 ◽

2014 ◽

Vol 17 (5-6) ◽

pp. 307-325 ◽

Cited By ~ 10

Author(s):

Thi Thu Nga Vu ◽

Gilbert Teyssedre ◽

Bertrand Vissouvandin ◽

Séverine Le Roy ◽

Christian Laurent ◽

...

Keyword(s):

Temperature Gradient ◽

Space Charge ◽

Field Distribution

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SIMULATION OF THE CURRENT-VOLTAGE CHARACTERISTICS OF SOLAR BATTERIES WITH CONSIDERING DECREASE OF LIGHTING DUE TO THE INFLUENCE OF JETS OF THE ELECTRIC PROPULSION

Space engineering and technology ◽

10.33950/spacetech-2308-7625-2019-4-56-64 ◽

2019 ◽

pp. 56-64

Author(s):

Ya.N. MIGUNOV ◽

V.V. ONUFRIEV

Keyword(s):

Solar Cells ◽

Temperature Gradient ◽

Electric Propulsion ◽

Protective Coatings ◽

Rocket Engine ◽

Solar Array ◽

Rocket Engines ◽

Lighting Conditions ◽

Main Equation ◽

Voltage Current Characteristic

A model for calculating the voltage-current characteristic of a solar array in the presence of a temperature gradient by its photovoltaic converters and their variable illumination due to possible pollution under the action of space factors, including operation of electric rocket engines, is described. The model is based on the main equation of a solar cell. In this case both a one-dimensional and a two-dimensional temperature gradients are taken into account. The principles of constructing a model are given, and the initial data selection is made. To simulate the lighting conditions of the solar array such a concept as effective illumination is used, i.e. the density of the radiation flux which falls on photovoltaic converters passing through the protective coatings. The features of simulation of the temperature distribution in the solar array and the effective illumination of its surface in cases of parallel, serial and mixed switching of solar cells are described. The calculation procedures and examples of solar cells are given. The construction of the model in universal mathematical package Mathcad is described. Some simulation results are discussed. Key words: solar array, mathematical simulation, illumination, temperature gradient, electric rocket engine, spacecraft, Mathcad.

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