Periodic heating amplifies the efficiency of thermoelectric energy conversion

Yan, Yan; Malen, Jonathan A.

doi:10.1039/c3ee24158k

Cited by 61 publications

(21 citation statements)

References 35 publications

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“…It was observed that when increasing the degree of insulation, the wall temperature swings highly increase, while at the same time the corresponding depth inside which they disappear, decreases. Investigation of the efficiency of a thermoelectric power generator (TPG) was performed by Yan and Malen [3]. Thermoelectric power generator converts heat directly into electricity without moving parts.…”

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confidence: 99%

A Three-Layers Plane Wall Exposed to Oscillating Temperatures with Different Amplitudes and Frequencies

Sadik¹

2018

EPE

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A linear model of three layers plane wall exposed to oscillating temperatures with different amplitudes and frequencies was built by using a physical superposition. A physical superposition of two states was performed, one state is a wall which one surface is exposed to oscillating temperature and the other surface is exposed to zero relative temperature and a second state is a wall which one surface is exposed to relative zero temperature while the other surface is exposed to oscillating temperature with different amplitudes and frequencies. Temperature distributions were introduced for different amplitudes, frequencies and thermal conductivities. It was shown that increasing the frequency value decreases the temperature penetration length, high frequency value leads to extremum temperature values changes on the surface while low frequency value allows gradually temperature changes during the time period. Temperature distribution lines where there are at the same time heat flux entry and heat flux exit were not received for the same constraint frequencies. Energy and Power Engineering appear causing a matter failure. Racopoulos et al. [1] [2] investigated the temperature oscillations in the combustion chamber walls of a diesel engine. Based on theoretical model and experimental measurements, the penetration of the oscillating temperature part of the temperature full value into the inner cylinder wall was shown for few matters. It was observed that when increasing the degree of insulation, the wall temperature swings highly increase, while at the same time the corresponding depth inside which they disappear, decreases. Investigation of the efficiency of a thermoelectric power generator (TPG) was performed by Yan and Malen [3]. Thermoelectric power generator converts heat directly into electricity without moving parts. It was shown that the use of a periodic heat source can increase the efficiency of a TPG. Temperature oscillations may be also formed by a periodic heating. Two methods of periodic heating implementation are an induction heating and a direct resistance heating. Surface hardening, welding and melting are some applications of induction heating. Direct resistance heating has major metal working applications as heating prior to forming and heat treating. Major nonmetals application is a glass melting. Sahin and Yilbas [4] analyzed the temperature rise in an insulated slab which is subjected to a direct resistance heating and to a conduction heating. It was found that for both heating methods, the thermal penetration depth for high frequencies is small.Additional area related to temperature oscillations is the controlling temperature in buildings. Ma and Wang [5] investigated the dynamic heat transfer performance of an exterior Planar Thermal Mass (ePTM) subject to sinusoidal heating and cooling. Analytical solution was performed when the mean value of outdoor air temperature was equal to indoor air temperature. The analytical solution showed that the time lag and the decrement factor are independent of ...

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confidence: 99%

A Three-Layers Plane Wall Exposed to Oscillating Temperatures with Different Amplitudes and Frequencies

Sadik¹

2018

EPE

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“…After the pulse is turned off, the temperature goes up to 240 K owing to the Joule heat arriving late 100 at the cold end. Later Yan and Malen [10] has experimentally observed that the efficiency in such a transient mode can be enhanced by a factor of five.…”

Section: Non-equilibrium Statesmentioning

confidence: 97%

Search for non-equilibrium thermoelectrics

2016

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Since thermoelectrics is an energy-conversion technology from heat flow to electrical flow, or vice versa, it is essentially a non-equilibrium phenomenon in the sense that energy and particle flows are involved. We have recently focused on this feature in order to overcome theoretical predictions of the upper limit of the conversion efficiency in thermal equilibrium conditions. One trial is the thermoelectric phenomena in the range of non-ohmic conduction. The second approach is the thermoelectric phenomena shown by the photo-doped carriers.

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“…Yan and Malen showed that the use of a periodic heat source, instead of a constant heat source, can improve the conversion efficiency of a thermoelectric power generator. In addition, they presented experimental measurements on a commercial thermoelectric device (bismuth telluride‐based device) to validate analytical and numerical models.…”

Section: Introductionmentioning

confidence: 99%