scholarly journals Heat Exchangers for Thermoelectric Devices

10.5772/33464 ◽  
2012 ◽  
Author(s):  
David Astrain ◽  
lvaro Martnez
Keyword(s):  
Heat Exchangers ◽  
Thermoelectric Devices

scholarly journals Corrosion Behavior in Volcanic Soils: In Search of Candidate Materials for Thermoelectric Devices

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7657
Author(s):  
Carlos Berlanga-Labari ◽  
Leyre Catalán ◽  
José F. Palacio ◽  
Gurutze Pérez ◽  
David Astrain
Keyword(s):  
Corrosion Behavior ◽  
Heat Exchangers ◽  
Corrosion Damage ◽  
Galvanized Steel ◽  
Thermoelectric Devices ◽  
Viable Solution ◽  
Environment Characteristic ◽  
Aisi 316 ◽  
One Year ◽  
Continuous Power

Thermoelectric generators have emerged as an excellent solution for the energy supply of volcanic monitoring stations due to their compactness and continuous power generation. Nevertheless, in order to become a completely viable solution, it is necessary to ensure that their materials are able to resist in the acidic environment characteristic of volcanoes. Hence, the main objective of this work is to study the resistance to corrosion of six different metallic materials that are candidates for use in the heat exchangers. For this purpose, the metal probes have been buried for one year in the soil of the Teide volcano (Spain) and their corrosion behavior has been evaluated by using different techniques (OM, SEM, and XRD). The results have shown excessive corrosion damage to the copper, brass, and galvanized steel tubes. After evaluating the corrosion behavior and thermoelectric performance, AISI 304 and AISI 316 stainless steels are proposed for use as heat exchangers in thermoelectric devices in volcanic environments.

Comprehensive Numerical Modeling of Thermoelectric Devices Applied to Automotive Exhaust Gas Waste-Heat Recovery

2013 ◽  
Author(s):  
B. V. K. Reddy ◽  
Matthew Barry ◽  
John Li ◽  
Minking K. Chyu
Keyword(s):  
Fluid Flow ◽  
Flow Rate ◽  
Heat Exchangers ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Exhaust Gas ◽  
Fluid Flow Rate ◽  
Automotive Exhaust ◽  
Thermoelectric Devices

This study investigates using numerical methods the performance of thermoelectric devices (TEDs) integrated with heat exchangers and applied to automotive exhaust gas waste-heat recovery. Air as an exhaust gas and water as a cooling fluid are used. The effects of temperature-dependent properties of materials (TE elements, ceramic plates, connectors, insulation materials and fluids) and interface electrical and thermal contact resistances on TED’s performance are included in the analysis. Additionally, the fluid heat exchangers and the insulation materials are modeled using a porous media approach. The response of hot and cold fluid inlet temperatures (Thi, Tci) and flow rates, number of modules N, permeability of heat exchangers and TE materials type on TED’s hydro-thermoelectric characteristics is studied. An increase in either Thi or a decrease in Tci is resulted in an enhancement in TED’s performance. The addition of modules is shown a significant effect on heat input Qh and power output P0 predictions; however, a minimal impact on efficiency η is displayed with N. For instance, at Thi = 873.15 K and Tci = 353.15 K with clathrate n-Ba8Ga16Ge30 and p-PbTe material’s combination, compared to single module case, TED with four modules showed 3.77- and 3.7-fold increase in P0 and Qh, respectively. In the studied 1–4 modules range, the cold fluid flow rate and the permeability of heat exchangers are exhibited a negligible effect on TED’s P0 and η, whereas the hot fluid flow rate is shown an appreciable change in η values. Further, when Thi is less than 500 K, TED with bismuth-tellurides showed a higher performance when compared to the clathrates and lead-tellurides materials combination.

Determination of creep mechanisms in various silicon carbides via TEM

1986 ◽  
Vol 44 ◽  
pp. 484-487
Author(s):  
C. H. Carter ◽  
J. E. Lane ◽  
J. Bentley ◽  
R. F. Davis
Keyword(s):  
Heat Exchangers ◽  
Sintered Material ◽  
Polycrystalline Material ◽  
Chemical Vapor ◽  
Graphite Substrate ◽  
Second Phase ◽  
Reaction Bonding ◽  
Creep Mechanisms ◽  
Porous Sic

Silicon carbide (SiC) is the generic name for a material which is produced and fabricated by a number of processing routes. One of the three SiC materials investigated at NCSU is Norton Company's NC-430, which is produced by reaction-bonding of Si vapor with a porous SiC host which also contains free C. The Si combines with the free C to form additional SiC and a second phase of free Si. Chemical vapor deposition (CVD) of CH3SiCI3 onto a graphite substrate was employed to produce the second SiC investigated. This process yielded a theoretically dense polycrystalline material with highly oriented grains. The third SiC was a pressureless sintered material (SOHIO Hexoloy) which contains B and excess C as sintering additives. These materials are candidates for applications such as components for gas turbine, adiabatic diesel and sterling engines, recouperators and heat exchangers.

Borehole Heat Exchangers in aquifers: simulation of the grout material impact

2016 ◽  
Vol 41 ◽  
pp. 268-271
Author(s):  
Luca Alberti ◽  
Adriana Angelotti ◽  
Matteo Antelmi ◽  
Ivana La Licata
Keyword(s):  
Heat Exchangers ◽  
Borehole Heat Exchangers

Dramatic efficiency gains through improved heat exchangers: the case of cassava flash drying in Nigeria

Food Chain ◽  
2015 ◽  
Vol 5 (1-2) ◽  
pp. 91-104 ◽  
Author(s):  
Andrew Marchant ◽  
Andrew Graffham ◽  
Lateef Sanni ◽  
Idowu Adeoya
Keyword(s):  
Heat Exchangers ◽  
Efficiency Gains ◽  
Flash Drying

Printed Thermoelectric Devices using Vanadate Glass Composite Materials

2013 ◽  
Vol 133 (7) ◽  
pp. 280-284
Author(s):  
Hideaki Takano ◽  
Chisaki Takubo ◽  
Kengo Asai ◽  
Yuichi Sawai ◽  
Tadashi Fujieda ◽  
...  
Keyword(s):  
Composite Materials ◽  
Glass Composite ◽  
Thermoelectric Devices ◽  
Vanadate Glass
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