scholarly journals Implementation of a parametric procedure allowing efficient positioning of heat sources: application to high-temperature composites thermoforming process

2017 ◽  
Vol 8 ◽  
pp. A12
Author(s):  
Moaine Jebara ◽  
Sofiane Belhabib ◽  
Lionel Boillereaux ◽  
Michel Havet ◽  
Alain Sarda ◽  
...  
Keyword(s):  
High Temperature ◽  
Inverse Method ◽  
Simple Procedure ◽  
Spatial Location ◽  
Second Step ◽  
Heat Sources ◽  
Parametric Curve ◽  
The Press ◽  
Thermoforming Process ◽  
Stochastic Optimization Algorithm

This work describes the implementation of a simple procedure that helps to easily position the heating elements in press plates used in high-temperature composites thermoforming process. The developed method permits to obtain desired temperature profiles on the surface of the press plates through two main steps. The first step consists in finding out an appropriate parametric curve that defines the spatial location of the heating sources into the thickness of the press heating plates. The second step uses an inverse method that combines a stochastic optimization algorithm in conjunction with finite element simulations. This second step serves for the adjustment of the position curve parameters to obtain a simulated temperature profile as close as possible to the expected one at the press plates surface. This easy-to-implement approach is shown to be very effective to rapidly obtain a suitable location of the heat sources that minimizes energy consumption.

Syn-convergent high-temperature metamorphism and magmatism in the Variscides: a discussion of potential heat sources

2000 ◽  
Vol 179 (1) ◽  
pp. 387-399 ◽  
Author(s):  
A. Henk ◽  
F. von Blanckenburg ◽  
F. Finger ◽  
U. Schaltegger ◽  
G. Zulauf
Keyword(s):  
High Temperature ◽  
Heat Sources ◽  
High Temperature Metamorphism

Method and Validation for Measurement of Effective Thermal Diffusivity and Conductivity of Pebble Bed in High Temperature Gas-Cooled Reactors

2018 ◽  
Vol 4 (3) ◽  
Author(s):  
Yongyong Wu ◽  
Cheng Ren ◽  
Rui Li ◽  
Xingtuan Yang ◽  
Jiyuan Tu ◽  
...  
Keyword(s):  
High Temperature ◽  
Thermal Diffusivity ◽  
Inverse Method ◽  
Experimental Result ◽  
Test Facility ◽  
Inherent Safety ◽  
Pebble Bed ◽  
Effective Thermal Diffusivity ◽  
Under Construction ◽  
High Temperature Gas

The effective thermal diffusivity and conductivity of pebble bed in the high temperature gas-cooled reactor (HTGR) are two vital parameters to determine the operating temperature and power in varisized reactors with the restriction of inherent safety. A high-temperature heat transfer test facility and its inverse method for processing experimental data are presented in this work. The effective thermal diffusivity as well as conductivity of pebble bed will be measured at temperature up to 1600 °C in the under-construction facility with the full-scale in radius. The inverse method gives a global optimal relationship between thermal diffusivity and temperature through those thermocouple values in the pebble bed facility, and the conductivity is obtained by conversion from diffusivity. Furthermore, the robustness and uncertainty analyses are also set forth here to illustrate the validity of the algorithm and the corresponding experiment. A brief experimental result of preliminary low-temperature test is also presented in this work.

Structural Examination of Iridium-Based Single-Crystal Preparations

1985 ◽  
Vol 29 ◽  
pp. 333-336 ◽  
Author(s):  
K. M. Axler ◽  
R. B. Roof
Keyword(s):  
High Temperature ◽  
Fuel Pellet ◽  
Compatibility Study ◽  
Al Alloy ◽  
Heat Sources ◽  
Growth Experiment ◽  
Structural Examination ◽  
Fuel Processing ◽  
Containment Shell ◽  
Potential Interactions

A high-temperature crystal growth experiment produced discrete singlecrystal products of Allr and IrSi. The preparation, and examination of these phases is described within. This project is part of a materials compatibility study relating to radioisotopic heat sources. These heat sources are comprised of a PuO2 fuel pellet encapsulated in an Ir alloy containment shell. Thorium is introduced as an additive within the Ir to maintain ductility. Si and P are picked up inadvertently in the fuel processing. The compatibility of the heat sources with Al is of interest because of potential interactions with the Al alloy hardware associated with the heat source environment.

Thermodynamic peculiarities of alpha-type Stirling engines for low-temperature difference power generation: Optimisation of operating parameters and heat exchangers using a third-order model

2013 ◽  
Vol 228 (11) ◽  
pp. 1936-1947 ◽  
Author(s):  
Benedikt Hoegel ◽  
Dirk Pons ◽  
Michael Gschwendtner ◽  
Alan Tucker ◽  
Mathieu Sellier
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Temperature Difference ◽  
Heat Exchangers ◽  
Operating Parameters ◽  
Heat Sources ◽  
Third Order ◽  
Concentrated Solar Energy ◽  
Stirling Engines ◽  
Temperature Heat

Low-temperature heat sources such as waste heat and geothermal energy in the range from 100 ℃ to 200 ℃ are widely available and their potential is largely untapped. Stirling engines are one possibility to convert this heat to a usable power output. Much work has been done to optimise Stirling engines for high-temperature heat sources such as external combustion or concentrated solar energy but only little is known about suitable engine layouts at lower temperature differences. With the reduced temperature difference, changes become necessary not only in the heat exchangers and the regenerator but also in the operating parameters such as frequency and phase angle. This paper shows results obtained from a third-order simulation model that help to identify beneficial parameter combinations, and explains the differences of low and high-temperature engines.

scholarly journals Antarctic topography and kilometre-scale roughness derived from ERS-1 altimetry

1996 ◽  
Vol 23 ◽  
pp. 374-381 ◽  
Author(s):  
Laurence Brisset ◽  
Frédérique Rémy
Keyword(s):  
Inverse Method ◽  
Large Scale ◽  
Ice Sheet ◽  
Second Step ◽  
Flow Conditions ◽  
Important Data ◽  
The Antarctic ◽  
Scale Roughness ◽  
Height Data ◽  
Basal Flow

The ERS-1 satellite has delivered altimetric data since 1992, enabling us to map most of the Antarctic ice-sheet topography south to 82° S with better precision than all previous techniques. An algorithm has been developed such that the accuracy of the height data reaches the sub-metre level. As a first step, an inverse method has been designed to map the large-scale global topography, which is of interest to the study of the ice-sheet flow dynamics. As a second step, an adapted inverse algorithm displays precisely the short-scale undulations which are controlled by the bedrock below the ice. Finally, variations in the back-scattered altimetric signal allow us to map directly the kilometre-scale roughness that is related to the basal-flow conditions. Together, these maps constitute an important data base for modelling the ice sheet.

Benefits of external heat sources for high temperature electrolyser systems

2014 ◽  
Vol 39 (11) ◽  
pp. 5505-5513 ◽  
Author(s):  
Floriane Petipas ◽  
Annabelle Brisse ◽  
Chakib Bouallou
Keyword(s):  
High Temperature ◽  
External Heat ◽  
Heat Sources
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