Experimental Validation of Temperature Distributions Across a Heat Exchanger for a Thermoelectric Generator

2012 ◽  
Author(s):  
Megan Dove ◽  
Jaideep Pandit ◽  
Srinath Ekkad ◽  
Scott Huxtable
Keyword(s):  
Heat Exchanger ◽  
Thermoelectric Generator ◽  
Experimental Validation ◽  
Electrical Power ◽  
Thermoelectric Generators ◽  
Cfd Model ◽  
Temperature Distributions ◽  
Performance Predictions ◽  
Computational Fluid Dynamics Cfd ◽  
The Difference

Thermoelectric generators (TEGs) are currently a topic of interest in the field of energy harvesting for automobiles. In applying TEGs to the outside of the exhaust tailpipe of a vehicle, the difference in temperature between the hot exhaust gases and the automobile coolant can be used to generate a small amount of electrical power to be used in the vehicle. The amount of power is anticipated to be a few hundred watts based on the temperatures expected and the properties of the materials for the TEG. This study focuses on developing efficient heat exchanger modules in order to maximize the power generation for a given vehicle and TEG. A computational fluid dynamics (CFD) model run by the authors has provided performance predictions for various cases on the cooling side of the heat exchanger. This paper discusses the setup and results of the experimental validation for the CFD model for the proposed TEG heat exchanger module.

DESIGN AND CONSTRUCTION OF A SIMPLE THERMOELECTRIC GENERATOR HEAT EXCHANGER FOR POWER GENERATION FROM SALINITY GRADIENT SOLAR POND

2015 ◽  
Vol 76 (5) ◽  
Author(s):  
Baljit Singh ◽  
Altenaijy Saoud ◽  
Muhammed Fairuz Remeli ◽  
Lai Chet Ding ◽  
Abhijit Date ◽  
...  
Keyword(s):  
Power Generation ◽  
Heat Exchanger ◽  
Thermal Energy ◽  
Thermoelectric Generator ◽  
Salinity Gradient ◽  
Electrical Power ◽  
Thermoelectric Generators ◽  
Lower Zone ◽  
Solar Pond ◽  
Electrical Power Output

Solar pond is one source of renewable thermal energy. The solar pond collects and stores thermal energy at the lower zone of the solar pond. The temperature at the lower zone can reach up to 90 °C. The solar pond is capable storing thermal energy for a long period. The stored thermal energy can be converted into electricity by using thermoelectric generators. These thermoelectric generators can be operated using the cold and hot zones from a solar pond. In this paper, the experimental investigation of power generation from the solar pond using thermoelectric generator and simple heat exchanger is discussed. A maximum of 7.02 W of electrical power output was obtained from a simple heat exchanger with 40 thermoelectric modules.

A Methodology for Blast Furnace Hearth Inner Profile Analysis

2007 ◽  
Vol 129 (12) ◽  
pp. 1729-1731 ◽  
Author(s):  
Yu Zhang ◽  
Rohit Deshpande ◽  
D. Huang ◽  
Pinakin Chaubal ◽  
Chenn Q. Zhou
Keyword(s):  
Heat Transfer ◽  
Blast Furnace ◽  
Profile Analysis ◽  
Furnace Hearth ◽  
Temperature Distributions ◽  
Blast Furnace Hearth ◽  
Computational Fluid Dynamics Cfd ◽  
The Difference ◽  
New Algorithms ◽  
Face Temperature

The wear of a blast furnace hearth and the hearth inner profile are highly dependent on the liquid iron flow pattern, refractory temperatures, and temperature distributions at the hot face. In this paper, the detailed methodology is presented along with the examples of hearth inner profile predictions. A new methodology along with new algorithms is proposed to calculate the hearth erosion and its inner profile. The methodology is to estimate the hearth primary inner profile based on 1D heat transfer and to compute the hot-face temperature using the 3D CFD hearth model according to the 1D preestimated and reestimated profiles. After the hot-face temperatures are converged, the hot-face positions are refined by a new algorithm, which is based on the difference between the calculated and measured results, for the 3D computational fluid dynamics (CFD) hearth model further computations, until the calculated temperatures well agree with those measured by the thermocouples.

scholarly journals Numerical analysis of liquid jet impingement cooling of a thermoelectric generator

2018 ◽  
Vol 240 ◽  
pp. 01032 ◽  
Author(s):  
Björn Pfeiffelmann ◽  
Ali Cemal Benim ◽  
Franz Joos
Keyword(s):  
Heat Exchanger ◽  
Thermoelectric Generator ◽  
Nonlinear Differential Equations ◽  
Jet Impingement ◽  
Heat Sources ◽  
Temperature Dependent ◽  
Conservation Of Energy ◽  
Impingement Cooling ◽  
Solid Region ◽  
Computational Fluid Dynamics Cfd

Designs of heat exchangers are quite often disconnected to the performance of thermoelectric generators (TEG). In this work, the TEG and the heat exchanger are numerical modelled simultaneously in a computational fluid dynamics (CFD) environment (OpenFOAM) to maximize the output power of the system while minimize the hydraulic power required. A preliminary work was done where the modelling of the heat exchanger, a single laminar slot jet, and the modelling of a 16 element TEG are validated. The considered heat exchanger is a laminar slot jet consists of a linear array of discrete heat sources which accord with the geometry of a thermoelectric generator. The considered 16 element TEG is modelled using the temperature dependent material properties which require a solution of a system of nonlinear differential equations, namely the conservation of energy and the conservation of electric current. The conjugate heat transfer OpenFOAM solver chtMultiRegionFoam is extended by an additional differential equation for the solid region to model the conservation of current. The conservation of energy is expanded by additional source terms based on Peltier/Thomson effect and Joule heat. To simplify the calculation, interface and 1D resistor load boundary conditions are developed and implemented. The heat exchanger and the TEG model, both, are validated by comparisons with measurements, where a good agreement is observed.

scholarly journals Experimental and Computational Analyses of Temperature Distributions in Slope-Type Thin-Film Thermoelectric Generators at Different Slope Angles and Evaluation of Their Thermoelectric Performance

Coatings ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 214 ◽  
Author(s):  
Saburo Tanaka ◽  
Masaki Yamaguchi ◽  
Rikuo Eguchi ◽  
Masayuki Takashiri
Keyword(s):  
Thin Film ◽  
Maximum Output Power ◽  
Slope Angle ◽  
Experimental Results ◽  
Maximum Output ◽  
Thermoelectric Generators ◽  
Temperature Distributions ◽  
Computational Fluid Dynamics Cfd ◽  
P Type ◽  
Computational Analyses

Thin-film thermoelectric generators are not widely used mainly because it is difficult to provide a temperature difference (ΔT) within the generators. To solve this problem, in our previous study, we prepared slope-type thin-film thermoelectric generators (STTEGs) using electrodeposition and transferred processes. A thin-film generator including n-type Bi2Te3 and p-type Sb2Te3 thin films was attached on slope blocks made of polydimethylsiloxane. In this study, the slope angle of STTEGs was optimized based on experimental results and computational analyses using computational fluid dynamics (CFD). With the increase in the slope angle, the ΔT began increasing and became saturated at a slope angle of 58°, and this trend was also confirmed by experimental measurements. When the heat source temperature was set at 65 °C, the ΔT computationally reached 26 K at a slope angle of 58°, and the maximum output power was 46.1 nW. Therefore, we demonstrated that the highest performance of STTEGs with an optimal slope angle can be estimated by combining the experimental results and computational analyses.

scholarly journals Design and Prototype of Electric Smart Stove

2021 ◽  
Vol 3 (1) ◽  
pp. 1
Author(s):  
Sa'adilah - Rosyadi ◽  
Bayu Rahmat Setiadi ◽  
Joko Slamet Saputro
Keyword(s):  
Thermoelectric Generator ◽  
Electrical Power ◽  
Electric Energy ◽  
Thermoelectric Module ◽  
Electrical Energy ◽  
Thermoelectric Generators ◽  
Fourth Stage ◽  
Second Stage ◽  
Third Stage ◽  
Electrical Power Output

The prototype of the electric smart stove is an electric stove with briquette fuel from teak leaf waste. The thermoelectric module used is 12 units of a Peltier TEC-12706. Thermoelectric generators take advantage of the Seebeck effect with temperature differences from both sides of the Peltier will produce electrical energy. The developing prototype method of an electric smart stove is carried out in 4 stages. First stage, analyzing geometry requirements and smart stove shape. Second stage is the process making of an electric smart stove. Third stage, installation of a power plant. The fourth stage, measurement of electrical power output. Based on the experiment, it is found that the thermoelectric generator produces 1.31 volts of electrical energy with a delta T of 40 degrees Celsius. As the result, an electric smart stove has not been able to charge the battery because the electric energy produced tends to be small.

scholarly journals Analysis of the Parameters of the Two-Sections Hot Side Heat Exchanger of the Module with Thermoelectric Generators

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 5169
Author(s):  
Mirosław Neska ◽  
Mirosław Mrozek ◽  
Marta Żurek-Mortka ◽  
Andrzej Majcher
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Low Temperature ◽  
Waste Heat ◽  
Electrical Power ◽  
Countercurrent Flow ◽  
Thermoelectric Generators ◽  
Plate Heat ◽  
System Parameters ◽  
Low Efficiency

One of the methods of converting thermal energy into electricity is the use of thermoelectric generators (TEG). The method can be used in low-temperature waste heat conversion systems from industrial installations, but its serious limitation is the low efficiency of thermolectric generators and the relatively low power of the electric waveforms obtained. Increasing the obtained power values is done by multiplying the number of TEGs used, grouped into modules (MTEG). In such systems, the design of the module is extremely important, as it should ensure the best possible heat transfer between both sides of the TEG (hot and cold), and thus obtaining maximum electrical power. The article presents an analysis of a two-section flat plate heat hot side exchanger MTEG. The key parameters like effectiveness of exchange and MTEG efficiency and their impact on the efficiency of heat use and generated electric power were indicated. The tests showed an improvement in these main system parameters for the mixed cycle (co-current and countercurrent—inward direction) of the hot side heat exchanger, compared to the countercurrent flow in both sections of this exchanger.

scholarly journals Thermoelectric Generator Based on CuSO4 and Na2SiO3

Proceedings ◽  
2020 ◽  
Vol 63 (1) ◽  
pp. 35
Author(s):  
Mihail Chira ◽  
Andreea Hegyi ◽  
Henriette Szilagyi ◽  
Horaţiu Vermeșan
Keyword(s):  
Thermoelectric Generator ◽  
Electrical Power ◽  
Distribution Networks ◽  
Thermoelectric Generators ◽  
Electrical Characteristics ◽  
Output Current ◽  
Hot Plate ◽  
Small Temperature ◽  
Voltage Output ◽  
Different Temperatures

Thermoelectric generators can operate at small temperature differences providing enough electricity for low-power electronics, sensors in distribution networks, and biomedical devices. The article presents the obtaining of a thermoelectric generator and its electrical characteristics using usual substances. Experimental research was carried out using a mixture consisting of several substances (copper sulfate, calcium hydroxide, silicon dioxide, and sodium silicate) in different proportions. The mixture was inserted between two plates, one graphite (hot plate) and the other aluminum (cold plate), thus obtaining a thermoelectric generator. Electrical voltage, output current, and electrical power were measured at different temperatures.

Heat-Exchanger Effectiveness in Thermoelectric Power Generation

1981 ◽  
Vol 103 (4) ◽  
pp. 693-698 ◽  
Author(s):  
M. S. Bohn
Keyword(s):  
Heat Transfer ◽  
Power Generation ◽  
Heat Exchanger ◽  
Thermoelectric Power ◽  
Thermoelectric Generator ◽  
Electrical Power ◽  
Thermoelectric Power Generation ◽  
Cold Fluid ◽  
Thermoelectric Heat ◽  
Two Fluid

This paper presents a method for calculating the electrical power generated by a thermoelectric heat exchanger. The thermoelectric heat exchanger transfers heat from a hot fluid to a cold fluid through a thermoelectric generator located in the heat-exchanger wall separating the two fluid streams. The method presented here is an extension of the NTU method used to calculate heat-exchanger heat-transfer effectiveness. The effectiveness of thermoelectric power generation is expressed as the ratio of the actual power generated to the power that would be generated if the entire heat-exchanger area were operating at the inlet fluid temperatures. This method collapses results for several heat-exchanger configurations and allows a concise presentation of the results. It is shown that the NTU method of calculating heat-exchanger heat-transfer effectiveness can be modified in a similar way.

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