Prof. Dong-Gun Lee Profile

Prof. Dong-Gun Lee

at Tech Univ of Korea

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Publications (2)

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Proceedings Article | 15 April 2016 Paper

Hybrid energy harvesting using active thermal backplane

Hyun-Wook Kim, Dong-Gun Lee

Proceedings Volume 9799, 97993D (2016) https://doi.org/10.1117/12.2219027

KEYWORDS: Ferromagnetics, Energy harvesting, Solar cells, Solar energy, Silicon solar cells, Physics, Smart materials, Cooling systems, New and emerging technologies, Convection, Applied physics, Silicon, Crystals, Renewable energy, Energy efficiency

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In this study, we demonstrate the concept of a new hybrid energy harvesting system by combing solar cells with magneto-thermoelectric generator (MTG, i.e., thermal energy harvesting). The silicon solar cell can easily reach high temperature under normal operating conditions. Thus the heated solar cell becomes rapidly less efficient as the temperature of solar cell rises. To increase the efficiency of the solar cell, air or water-based cooling system is used. To surpass conventional cooling devices requiring additional power as well as large working space for air/water collectors, we develop a new technology of pairing an active thermal backplane (ATB) to solar cell. The ATB design is based on MTG technology utilizing the physics of the 2nd order phase transition of active ferromagnetic materials. The MTG is cost-effective conversion of thermal energy to electrical energy and is fundamentally different from Seebeck TEG devices. The ATB (MTG) is in addition to being an energy conversion system, a very good conveyor of heat through both conduction and convection. Therefore, the ATB can provide dual-mode for the proposed hybrid energy harvesting. One is active convective and conductive cooling for heated solar cell. Another is active thermal energy harvesting from heat of solar cell. These novel hybrid energy harvesting device have potentially simultaneous energy conversion capability of solar and thermal energy into electricity. The results presented can be used for better understanding of hybrid energy harvesting system that can be integrated into commercial applications.

Proceedings Article | 15 April 2016 Paper

Magneto-Thermo-Triboelectric Generator (MTTG) for thermal energy harvesting

Kwang Yeop Jang, James Lee, Dong-Gun Lee

Proceedings Volume 9799, 97993C (2016) https://doi.org/10.1117/12.2218800

KEYWORDS: Ferromagnetics, Energy harvesting, Interfaces, Thermal effects, Sensors, Nanotechnology, Magnetism

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We present a novel thermal energy harvesting system using triboelectric effect. Recently, there has been intensive research efforts on energy harvesting using triboelectric effect, which can produce surprising amount of electric power (when compared to piezoelectric materials) by rubbing or touching (i.e, electric charge by contact and separation) two different materials together. Numerous studies have shown the possibility as an attractive alternative with good transparency, flexibility and low cost abilities for its use in wearable device and smart phone applications markets. However, its application has been limited to only vibration source, which can produce sustained oscillation with maintaining contact and separation states repeatedly for triboelectric effect. Thus, there has been no attempt toward thermal energy source. The proposed approach can convert thermal energy into electricity by pairing triboelectric effect and active ferromagnetic materials The objective of the research is to develop a new manufacturing process of design, fabrication, and testing of a Magneto-Thermo-Triboelectric Generator (MTTG). The results obtained from the approach show that MTTG devices have a feasible power energy conversion capability from thermal energy sources. The tunable design of the device is such that it has efficient thermal capture over a wide range of operation temperature in waste heat.

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