Micro solar energy harvesting using thin film selective absorber coating and thermoelectric generators

Ogbonnaya, E.; Gunasekaran, A.; Weiss, Leland

doi:10.1007/s00542-012-1687-6

Cited by 13 publications

(9 citation statements)

References 17 publications

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“…Figure 4 shows the relationship between average heat loss coefficient, U, and T e . Actual absorptivity α s determined from prior published work was used for this analysis [20]. Hence, this plot utilizes incident radiation of 750 W/m 2 , absorptivity of 0.91, and emissivity of 0.1.…”

Section: Resultsmentioning

confidence: 99%

“…Two tests were conducted. The first was conducted under atmospheric conditions similar to previously reported tests [20]. These formed the baseline data for this present work.…”

Section: Test Setup Andmentioning

confidence: 93%

“…We have previously demonstrated this collector in small-scale application in ambient conditions [20]. This prior work has indicated that black Ni-Sn selective coating has promising potential as a highly effective selective absorber structure with absorptivity α s of 0.98 and emissivity ϵ of 0.10 [21].…”

Section: Knudsen Numbermentioning

confidence: 97%

“…The fabrication and testing of a solar selective absorber coating in atmospheric pressure conditions have been reported in prior published work. Fabrication of the collector plates that were tested as part of this effort is also reviewed and has been published in prior work [20]. A brief overview of the fabrication of these plates is included in this section.…”

Section: Knudsen Numbermentioning

confidence: 99%

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Small-Scale Flat Plate Collectors for Solar Thermal Scavenging in Low Conductivity Environments

Ogbonnaya

Weiss

2017

International Journal of Photoenergy

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There is great opportunity to develop power supplies for autonomous application on the small scale. For example, remote environmental sensors may be powered through the harvesting of ambient thermal energy and heating of a thermoelectric generator. This work investigates a small-scale (centimeters) solar thermal collector designed for this application. The absorber is coated with a unique selective coating and then studied in a low pressure environment to increase performance. A numerical model that is used to predict the performance of the collector plate is developed. This is validated based on benchtop testing of a fabricated collector plate in a low-pressure enclosure. Model results indicate that simulated solar input of about 800 W/m 2 results in a collector plate temperature of 298 K in ambient conditions and up to 388 K in vacuum. The model also predicts the various losses in W/m 2 K from the plate to the surroundings. Plate temperature is validated through the experimental work showing that the model is useful to the future design of these small-scale solar thermal energy collectors.

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Section: Resultsmentioning

confidence: 99%

“…Two tests were conducted. The first was conducted under atmospheric conditions similar to previously reported tests [20]. These formed the baseline data for this present work.…”

Section: Test Setup Andmentioning

confidence: 93%

Section: Knudsen Numbermentioning

confidence: 97%

Section: Knudsen Numbermentioning

confidence: 99%

See 2 more Smart Citations

Small-Scale Flat Plate Collectors for Solar Thermal Scavenging in Low Conductivity Environments

Ogbonnaya

Weiss

2017

International Journal of Photoenergy

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“…Chen et al (2010) modelled integration of TEG in combined heat and power (CHP) production and showed reduced fuel demand and reduced CO 2 emissions compared to a CHP production without TEG. Ogbonnaya et al (2013) integrated a small-scale solar thermal collector with a TEG and the results of the study showed a larger power output if the thermal solar collector was coated with a selective absorber.…”

Section: Thermoelectric Generator (Teg)mentioning

confidence: 99%

Electricity generation from low-temperature industrial excess heat—an opportunity for the steel industry

Johansson

Söderström

2013

Energy Efficiency

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Awareness of climate change and the threat of rising energy prices have resulted in increased attention being paid to energy issues, and industry seeing a cost benefit in using more energyefficient production processes. One energy-efficient measure is the recovery of industrial excess heat. However, this option has not been fully investigated and some of the technologies for recovery of excess heat are not yet commercially available. This paper proposes three technologies for the generation of electricity from low temperature industrial excess heat. The technologies are thermoelectric generation, organic Rankine cycle and phase change material engine system. The technologies are evaluated in relation to each other, with regard to temperature range of the heat source, conversion efficiency, capacity and economy.Because the technologies use heat of different temperature ranges, there is potential for concurrent implementation of two or more of these technologies. Even if the conversion efficiency of a technology is low, it could be worthwhile to utilise if there is no other use for the excess heat.The iron and steel industry is energy intensive and its production processes are often conducted at high temperatures. As a consequence large amounts of excess heat are generated. The potential electricity production from low temperature excess heat at a steel plant was calculated together with the corresponding reduction in global CO 2 emissions.

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A vibration‐based electromagnetic and piezoelectric hybrid energy harvester

Khan

2020

Int J Energy Res

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Summary This work presents the fabrication and testing of a vibration‐based single energy hybrid harvester (VSEHH). Electromagnetic and piezoelectric transduction mechanisms are utilized for energy extraction in the developed harvester. Electromagnetic portion of the device composed of a permanent magnet, planar coil and wound coil, however, for piezoelectric portion polyvinylidene difluoride (PVDF) membrane is used. In the harvester the PVDF membrane having the magnet is kept loose in order to exploit the spring softening nonlinearity. At lower base excitation levels (less than 0.5g) the response of the VSEHH is linear, however, from 0.5 to 2.5g the harvester exhibits spring softening nonlinearity and at acceleration levels greater than 2.5g, the spring hardening nonlinearity is invoked. Because of nonlinear behavior of the harvester, the shift of resonant frequency, the sudden jump‐up and jump‐down phenomena result in the enhancement of the harvester's frequency bandwidth. Under sinusoidal excitation and at 123 Hz frequency and 4g acceleration, the electromagnetic portion of the harvester produced 40.6 mV load voltage and 212.7 μW with planar coil and 73.5 mV load voltage and 319.1 μW power with wound coil. Moreover, under the same vibrations condition a load voltage of 2930 mV and power of 57.6 μW is generated by the piezoelectric portion of the harvester. Collectively, the harvester is capable of producing a power of 589.4 μW and a power density of 334.13 μW/cm3. Furthermore, when subjected to broadband random vibrations, two central frequency peaks are produced, one is due to spring softening and the other corresponds to the spring hardening of the membrane.

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Micro solar energy harvesting using thin film selective absorber coating and thermoelectric generators

Cited by 13 publications

References 17 publications

Small-Scale Flat Plate Collectors for Solar Thermal Scavenging in Low Conductivity Environments

Small-Scale Flat Plate Collectors for Solar Thermal Scavenging in Low Conductivity Environments

Electricity generation from low-temperature industrial excess heat—an opportunity for the steel industry

A vibration‐based electromagnetic and piezoelectric hybrid energy harvester

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