scholarly journals Nonlocal Problems Arising in Thermoelectrics

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Jaywan Chung ◽  
Byungki Ryu
Keyword(s):  
Power Generation ◽  
Temperature Distribution ◽  
Electric Current ◽  
Nonlocal Problem ◽  
Thermoelectric Effect ◽  
Nonlocal Problems ◽  
Diffusion Term

We revisit the derivation of a nonlocal problem modelling temperature distribution due to power generation using thermoelectric effect. The problem has nonlocal coefficients in reaction and convection terms rather than diffusion term, which makes the problem more interesting. In this paper, we prove that the nonlocal problem has a unique decreasing solution when electric current induced by the thermoelectric effect is small enough.

scholarly journals Impact of MPL on Temperature Distribution in Single Polymer Electrolyte Fuel Cell with Various Thicknesses of Polymer Electrolyte Membrane

Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2499
Author(s):  
Akira Nishimura ◽  
Tatsuya Okado ◽  
Yuya Kojima ◽  
Masafumi Hirota ◽  
Eric Hu
Keyword(s):  
Power Generation ◽  
Fuel Cell ◽  
Temperature Distribution ◽  
Polymer Electrolyte ◽  
Polymer Electrolyte Membrane ◽  
Polymer Electrolyte Fuel Cell ◽  
Electrolyte Membrane ◽  
The Impact ◽  
Plane Temperature ◽  
Power Generation Performance

The impact of micro porous layer (MPL) with various thicknesses of polymer electrolyte membrane (PEM) on heat and mass transfer characteristics, as well as power generation performance of Polymer Electrolyte Fuel Cell (PEFC), is investigated. The in-plane temperature distribution on cathode separator back is also measured by thermocamera. It has been found that the power generation performance is improved by the addition of MPL, especially at higher current density condition irrespective of initial temperature of cell (Tini) and relative humidity condition. However, the improvement is not obvious when the thin PEM (Nafion NRE-211; thickness of 25 μm) is used. The increase in temperature from inlet to outlet without MPL is large compared to that with MPL when using thick PEM, while the difference between without MPL and with MPL is small when using thin PEM. It has been confirmed that the addition of MPL is effective for the improvement of power generation performance of single PEFC operated at higher temperatures than normal. However, the in-plane temperature distribution with MPL is not even.

Effects of Non-Uniform Hot Junction Temperature Distribution on the Outputs of Thermoelectric Power Generation System

2013 ◽  
Vol 283 ◽  
pp. 87-97 ◽  
Author(s):  
Bimrew Tamrat Admasu ◽  
Xiao Bing Luo ◽  
Jia Wei Yao ◽  
Ting Zhen Ming
Keyword(s):  
Power Generation ◽  
Finite Element ◽  
Temperature Distribution ◽  
Thermoelectric Power ◽  
Material Property ◽  
Thermoelectric Module ◽  
Element Formulation ◽  
Generation System ◽  
Thermoelectric Power Generation ◽  
Power Generation System

Abstract. Besides the material property and dimensional optimization of the thermoelectric module, temperature distribution uniformity on the hot junction of the module surface highly affects the outputs of the thermoelectric power generation system. This paper reports the findings on the effects of non-uniform input temperature distribution on the performance of thermoelectric power generation system. To assure the investigation, heat transfer model and finite element formulation of thermoelectric module having non-linear material property have been developed. In addition to the experimental data from a real thermoelectric device, thermoelectric power generation system modeling and simulation using finite element packaging ANSYS software was carried out. For the simulation, temperature dependent thermoelectric material properties such as the Seebeck coefficient, thermal and electrical conductivity have been considered. The experimental and simulation results indicate that keeping the temperature distribution uniform on the hot junction of the thermoelectric module results higher efficiency, higher power, voltage and current outputs than the non-uniform temperature distribution.

Change in temperature distribution by constriction of electric current through contact area

2015 ◽  
Vol 20 (4) ◽  
pp. 337-344
Author(s):  
K. Wakabayashi ◽  
P. Hemthavy ◽  
S. Saito ◽  
K. Takahashi
Keyword(s):  
Temperature Distribution ◽  
Electric Current ◽  
Contact Area

Plastic Flow at the Chip-Tool Interface During Hot Machining

1971 ◽  
Vol 93 (2) ◽  
pp. 437-440 ◽  
Author(s):  
B. Bhattacharyya ◽  
R. F. Scrutton
Keyword(s):  
Temperature Distribution ◽  
Physical Properties ◽  
Electric Current ◽  
Plastic Flow ◽  
Joule Heating ◽  
Plastic Layer ◽  
Hot Machining

The plastic flow of metal adjacent to the chip-tool interface when machining heated workpieces is examined theoretically. It is shown that all metallic workpiece materials possess an optimum machining temperature which is dependent on the physical properties of the material. The temperature distribution in the plastic layer in the presence of an electric current normal to the interface is considered in relation to the general plastic flow of metals accompanied by Joule heating.

scholarly journals Uji Kinerja Alat Penyangrai Kopi Tipe Silinder Menggunakan Band-Heater sebagai Pemanas

2020 ◽  
Vol 4 (4) ◽  
pp. 382-391
Author(s):  
Gamal Abdil Nasir ◽  
Syafriandi Syafriandi ◽  
Mustaqimah Mustaqimah
Keyword(s):  
Temperature Distribution ◽  
Data Collection ◽  
Water Content ◽  
Electric Power ◽  
Electric Current ◽  
Electrical Power ◽  
Coffee Consumption ◽  
Electrical Energy ◽  
Analysis Data ◽  
Heat Element

Abstrak. Konsumsi kopi di Indonesia mengalami kenaikan rata-rata sekitar 3 % setiap tahunnya. Meningkatnya nilai konsumsi kopi menjadi pendorong bagi pelaku pengolahan kopi untuk meningkatkan produksinya. Oleh karena itu penting untuk memiliki alat penyangrai yang dapat meningkatkan kualitas dan kuantitas produksi. Penelitian ini dilakukan pengujian mesin sangrai tipe silinder yang dilengkapi elemen panas (heater) sebagai pemanas dan diharapkan dapat mempercepat proses penyangraian dengan kadar air sangrai yang lebih seragam.Tujuan penelitian adalah untuk mengetahui kinerja mesin sangrai kopi tipe silinder menggunakan elemen panas (heater) untuk penyangraian kopi robusta sebanyak 2 kg/penyangraian.Prosedur penelitian dimulai dengan persiapan alat, pengumpulan data dan analisa data. Pengumpulan data dilakukan dengan metode observasi. Pengamatan dan analisis data meliputi distribusi suhu, kadar air, kuat arus listrik, daya listrik dan kebutuhan energi listrik.Hasil penelitian menunjukan penyangraian dilakukan pada tingkat menengah (medium), nilai distribusi suhu yang dihasilkan berbeda, sesuai jumlah heater yang digunakan. Heater 7, suhu berkisar 70-85 °C dengan kadar air kopi sangrai 2.2 % sementara suhu sangrai 9 Heater, berada di 98.33-114 °C kadar air 1.37 % dengan tingkat kematangan yang relatif beragam. Daya listrik yang diperlukan untuk menjalankan semua elemen panas pada penyangraian dengan 7 heater yaitu 2160.56 watt dengan kuat arus yang diperlukan 9.95 ampere, daya listrik sangrai dengan 9 heater 2726.74 watt arus listrik yang dibutuhkan 12.71 ampere.Test the Performance of Coffee Roasters by Using a Heat Element as a Heat SourceAbstract. Coffee consumption in Indonesia has increased an average of around 3% every year. The increasing value of coffee consumption is driving the coffee processing industry to increase its production. Therefore it is important to have a roaster that can improve the quality and quantity of production. This research is carried out testing a cylindrical type roaster machine equipped with a heating element (heater) as a heater and is expected to accelerate the roasting process with a more uniform roasting water content.The purpose of this study was to determine the performance of a cylindrical type coffee roaster machine using a heat element (heater) for roasting robusta coffee of 2 kg / roasting. The research procedure begins with the preparation of tools, data collection and data analysis. Data collection is done by observation method. Data observations and analyzes include temperature distribution, water content, electric current strength, electric power and electrical energy requirements.The results showed that roasting was done at the medium level (medium), the resulting temperature distribution values were different, according to the number of heaters used. Heater 7, the temperature ranges from 70-85 ° C with 2.2% roasted coffee water content while the temperature of the roasted 9 Heater, is at 98.33-114 ° C the water content is 1.37% with a relatively diverse level of maturity. The electric power needed to run all the heat elements in roasting with 7 heaters is 2160.56 watts with the required strong current of 9.95 amperes, roasted electrical power with 9 heaters 2726.74 watts of electric current required 12.71 amperes.

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