Investigating the thermoelectric properties of Na0.74Co<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.svg"><mml:msub><mml:mrow /><mml:mrow><mml:mn>1</mml:mn><mml:mo linebreak="badbreak" linebreakstyle="after">−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math>Nb O2 (x = 0.05,0.10) at high temperature region

Sk, Shamim; Khatun, Arzena; Pati, Jayashree; Dhaka, R. S.; Pandey, Sudhir K.

doi:10.1016/j.physleta.2020.126893

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“…The selection of TEM is mainly based on their operating temperature range, like Bi 2 Te 3 TEM has optimum efficiency in the temperature range of 310 K-500 K. It has a low melting point, and the tendency of melting is very high at higher temperature [4]. Singh et al [5] have studied the thermoelectric properties and behavior of Ag2S x Se 1−x (x=0.0, 0.2, 0.4) in the temperature range of 300 K-500 K. They were able to achieve ZT∼1 in the temperature range of 350 K-400 K with a maximum value of 1.08 at 350 K. Shamim et al [6] have investigated the thermoelectric properties of Na 0.74 Co 1−x Nb x O 2 (x=0.05, 0.10) experimentally and computationally at high temperature region. They found the values of ZT∼1.36 and∼1.22 at 1200 K for x=0.05 and 0.10, respectively and calculated the efficiency at 1200 K temperature, which was∼6.4% for x=0.05 and∼7.5% for x=0.10.…”

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confidence: 99%

Optimization of Hybridization Strategy for Improving the Efficiency of Thermoelectric Generator to Recover Automobile Exhaust Waste Heat

2022

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This paper investigates the existing efficiency formulations of a thermoelectric generator (TEG) and compares them with overall efficiency formulation (ηoverall). As TEG efficiency is the key factor in TEG performance, ηoverall formulation is validated and compared to the maximum efficiency (ηmax) formulation with consideration of temperature independent figure of merit (ZT). We have found that the (ηmax - ηoverall) is minimum (1.5%) at low temperature difference (100 K) and it increases (up to 12.67%) when temperature difference increases (up to 800 K). ηoverall is close to ηmax at low temperature difference but when temperature difference increases, ηoverall shows the overestimation of the efficiency results. Compatibility factor is the crucial factor for effective hybridization and segmentation of thermoelectric materials. Thermoelectric materials of Half-heusler alloys of Hf0.75Zr0.25Ni0.9Pd0.1Sn0.975Sb0.025 and FeV1.2−xTixSb (x = 0.4) are considered for the p-n couple and TEG module design. The exhaust thermoelectric generator (ETEG) system consisting of 56 TEG modules is proposed to recover the automobile exhaust waste heat. Output power of 51.52 W is obtained from the ETEG system at a temperature difference of 458 K. At a temperature difference of 800 K (when cold end temperature is fixed at 315 K and hot end temperature vary up to 1115 K), the ETEG system can achieve 75.8 W of power. This ETEG system also provides an additional advantage in the life increment of the muffler due to a reduction in peak temperature. The overall efficiency of the proposed ETEG system is found to be 7.81 %.

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Section: Introductionmentioning

confidence: 99%

Optimization of Hybridization Strategy for Improving the Efficiency of Thermoelectric Generator to Recover Automobile Exhaust Waste Heat

2022

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Investigating the thermoelectric properties of Na0.74Co1−xNb O2 (x = 0.05,0.10) at high temperature region

Cited by 1 publication

References 41 publications

Optimization of Hybridization Strategy for Improving the Efficiency of Thermoelectric Generator to Recover Automobile Exhaust Waste Heat

Optimization of Hybridization Strategy for Improving the Efficiency of Thermoelectric Generator to Recover Automobile Exhaust Waste Heat

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Investigating the thermoelectric properties of Na0.74Co1−xNb O2 (x = 0.05,0.10) at high temperature region

Cited by 1 publication

References 41 publications

Optimization of Hybridization Strategy for Improving the Efficiency of Thermoelectric Generator to Recover Automobile Exhaust Waste Heat

Optimization of Hybridization Strategy for Improving the Efficiency of Thermoelectric Generator to Recover Automobile Exhaust Waste Heat

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Investigating the thermoelectric properties of Na0.74Co1−xNb O2 (x = 0.05,0.10) at high temperature region