Alfred Alfred

Join us at the 232nd Electrochemical Society Meeting (ECS)

We are fortunate to be invited to speak at the 232nd Electrochemical Society Meeting (ECS). The meeting will be held October 1-5 2017 in National Harbor, MD. Please join us!


Presentation Title:

Peltier Supercooling with Isosceles Current Pulses: Cooling an Object with Internal Heat Generation



Applying a current pulse enables a transitory state where the cold junction of a Peltier couple reaches temperatures below that obtainable via maximum temperature delta steady-state current. This supercooling is followed by a period of superheating. With optimized triangular current pulses, the sum of supercooling and superheating can result in net cooling. The objective herein is to gain insight on the sensitivity of system performance during pulsed cooling of a heat generating object with an optimized pulse. A comprehensive parametric study was performed using an electrical-thermal analog model built in SPICE. Heat transfer rate on the cold side can be improved initially as compared to steady state operation at optimal current. The coefficient of performance (COP) decreased during a pulse due to the fast time constant of electrical power consumption relative to cold side heat transfer rate. Time delayed Joule heat and Seebeck voltage contribute to further lowering of COP. However, higher resistance interface materials can improve both the cold side heat transfer rate and COP during a portion of the transient pulse.


Importance of This Work

This work provides a fundamental understanding of an area of thermoelectric cooling that had not previously been explored. Insight gained from this research can be used  to design and model improved thermoelectric systems and modules.


Related Work

If you are interested in this work, you will also enjoy our previous work (Peltier Supercooling with Isosceles Current Pulses: A Response Surface Perspective). The work was presented at the 2017 36th International Conference on Thermoelectrics (ICT).

About Applied Thermoelectric Solutions

At Applied Thermoelectric Solutions LLC, we are passionate about solid-state thermoelectric thermal management, thermal energy harvesting, and the limitless opportunities to apply the technology to the world around us. We design, engineer, build and test thermoelectric systems for your product or application. We are a Michigan based engineering and R&D company. While other companies focus on manufacturing thermoelectric modules, our focus is on the full system. We specialize in custom and optimized thermoelectric modules and systems. We apply thermoelectric technology to your product or application with unconventional thinking, a high level of multidisciplinary engineering expertise, innovation, and design. We strive to make the whole process of obtaining a prototype as simple and straightforward as possible. Whether your product or application is one of a kind or will be high-volume mass produced, we can help. We will design any system no matter the complexity. We care about quality, performance, and cost-effective design. We believe that balance between the theoretical and the practical is important when designing a system. We continuously question the status quo and push the boundaries of conventional thinking to provide you with the best solution.

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Alfred Piggott is founder and Chief Technical Officer (CTO) at Applied Thermoelectric Solutions LLC.  In this role, Alfred works with clients to design, build and test custom and optimized solid-state thermal management and thermal energy harvesting systems and solutions. Alfred is a qualified mechanical / thermal engineer. He holds a Master's degree in Mechanical Engineering from Michigan Technological University.  The subject of his research was in regard to using electrical current pulses to improve thermoelectric cooling performance. He currently holds 7 patents and has 4 patents pending regarding advanced thermoelectric and thermal management devices. Alfred earned a bachelor's degree in Mechanical Engineering from the University of Michigan. There he won the Mechanical Engineering department and overall School of Engineering Senior Design Competition with an innovative thermal energy conversion device. Alfred is no stranger to thermoelectrics and thermal management, having spent 18 years as an engineer where he focused on mechanical and thermal design, product development, systems engineering, thermal modeling, advanced engineering and research and development. Most recently Alfred led thermoelectric design and development in the advanced engineering group of Gentherm and advanced thermal systems engineering at FCA US LLC. Prior to his engineering career, Alfred spent 8 years as an ASE certified automotive technician.  Passionate about thermoelectrics, Alfred has helped a wide range of clients to find quality and cost-effective solutions to their thermal management and thermal energy harvesting needs. Drawing on 26+ years of diverse experience, he also now gives talks about thermoelectrics to the top thermoelectrics societies about his research in the field, for example, Peltier Supercooling with Isosceles Current Pulses: A Response Surface Perspective. ECS Journal of Solid State Science and Technology, JSS Focus Issue on Thermoelectric Materials & Devices. 2017; 6(3): N3045-N54  Alfred’s varied background as a technician, in Industry, advanced engineering and R&D provides the perfect foundation for his current role at Applied Thermoelctric Solutions LLC.

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