Heat-Driven Self-Cooling System Based On Thermoelectric Generation Effect

Authors

Robel KiflemariamFollow

Document Type

Thesis

Degree

Doctor of Philosophy (PhD)

Major/Program

Mechanical Engineering

First Advisor's Name

Cheng-Xian Lin

First Advisor's Committee Title

Committee chair

Second Advisor's Name

Yiding Cao

Second Advisor's Committee Title

committee member

Third Advisor's Name

Bilal El-Zahab

Third Advisor's Committee Title

committee member

Fourth Advisor's Name

Nezih Pala

Fourth Advisor's Committee Title

committee member

Fifth Advisor's Name

Gang Quan

Fifth Advisor's Committee Title

committee member

Keywords

Mechanical Engineering, Thermoelectric effect, Self-cooling

Date of Defense

10-16-2015

Abstract

This research entails the first comprehensive and systematic study on a heat-driven, self-cooling application based on the thermoelectric generation effect. The system was studied using the first and second laws of thermodynamics to provide a solid and basic understanding of the physical principles governing the system. Multiphysics equations that relate heat transfer, fluid dynamics and thermoelectric generation are derived. The equations are developed with increasing complexity, from the basic Carnot heat engine to externally and internally irreversible engines. A computational algorithm to systematically use the fundamental equations has been presented and computer code is implemented based on the algorithm.

Experiments were conducted to analyze the geometric and system parameters affecting the application of thermoelectric based self-cooling in devices. Experimental results show that for the highest heat input studied, the temperature of the device has been reduced by 20-40% as compared to the natural convection case. In addition, it has been found that in the self-cooling cases studied, convection thermal resistance could account for up to 60% of the total thermal resistance.

A general numerical methodology was developed to predict steady as well as transient thermal and electrical behavior of a thermoelectric generation-based self-cooling system. The methodology is implemented by using equation modeling capabilities to capture the thermo-electric coupled interaction in TEG elements, enabling the simulation of major heating effects as well as temperature and spatial dependent properties. An alternative methodology was also presented, which integrates specialized ANSI-C code to integrate thermoelectric effects, temperature-dependent properties and transient boundary conditions. It has been shown that the computational model is able to predict the experimental data with good accuracy (within 5% error). A parametric study has been done using the model to study the effect of heat sink geometry on device temperature and power produced by TEG arrays.

In addition, a dynamic model suited for integration in control systems is developed. Therefore, the study has shown the potential for a heat driven self-cooling system and provides a comprehensive set of tools for analysis and design of thermoelectric generation.

Identifier

FIDC000179

Recommended Citation

Kiflemariam, Robel, "Heat-Driven Self-Cooling System Based On Thermoelectric Generation Effect" (2015). FIU Electronic Theses and Dissertations. 2281.
https://digitalcommons.fiu.edu/etd/2281