Miers_Dissertation_May2019.pdf (23.29 MB)

Thermal Metrology for Waste Heat Systems: Thermoelectrics to Phase Change Materials

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thesis
posted on 25.06.2020 by Collier S Miers
This dissertation presents the development of two unique measurement platforms.

The first system is a high-temperature Z-Meter. This system is designed to simultaneously measure the electrical resistivity, Seebeck coefficient, and thermal conductivity of a thermoelectric sample to accurately determine the figure of merit, ZT, for that material. It is designed to operated at sample temperatures of up to 1000C, and with temperature gradients on the order of 500C across the sample. This system also provides in situ load monitoring for contact pressure and allows the user to adjust loading during the experiment.

The second part of this dissertation focuses on the development of enhanced composite phase change material (PCM) heat sinks to improve passive thermal management in mobile electronics. We present a new design for a composite PCM heat sink and utilize off-the-shelf PCMs to show characterize the performance. In order to accurately investigate the performance enhancement of these designs, we develop a turn-key thermal management evaluation platform to allow the user complete control over the power profiles and cycling applied to the test chip, as well as providing in situ temperature monitoring within the chip. The proposed package designs show significant improvement in the length of time extended before reaching the cut-off temperature within the heatfluxes tested, 6 - 14 W/cm^2, and accomplish this while weighing less than the equivalent sensible heat storage design.



Funding

PCM - Optimizing Material Properties: Enthalpy and Conductivity - Cooling Technology Research Center (CTRC)

Z-Meter User Instrument Development - Birck Nanotechnology Center

History

Degree Type

Doctor of Philosophy

Department

Mechanical Engineering

Campus location

West Lafayette

Advisor/Supervisor/Committee Chair

Amy Marconnet

Additional Committee Member 2

Ali Shakouri

Additional Committee Member 3

Ganesh Subbarayan-Shastri

Additional Committee Member 4

John A. Howarter

Additional Committee Member 5

Xianfan Xu

Licence

Exports