Alfred Alfred
SPICE model of a heat generating object cooled by transient pulses

Transient Electrical Current Peltier Cooling Performance

Please find the below downloadable PDF with our latest work titled Peltier Supercooling with Isosceles Current Pulses: Cooling an Object with Internal Heat Generation. This work was published December 27, 2017 and was presented at the 232nd Electrochemical Society Meeting (ECS) held October 1-5 2017 in National Harbor, MD. 

The work is important because it provides a fundamental understanding of Peltier cooler performance under transient operating conditions. It also allows for a deeper understanding of steady-state performance.

This research is complementary to previous work where we studied Peltier Supercooling from a response surface perspective. This was presented at the 36th International Conference on Thermoelectrics held July 31st through August 3rd 2017 in Pasadena, CA. The response surface presentation can be downloaded here.


Applying a current pulse enables a short-term transitory state where the cold junction of a Peltier couple reaches temperatures below that obtainable via maximum temperature delta steady-state current. Short-term cooling applications like on-chip hot spot and pulsed laser sensor cooling have been studied using pulsed cooling. Some studies have proposed applications that utilize consecutive repeating pulses for longer term cooling applications. These studies have found or theorized increased cooling and coefficient of performance (COP). Considering these studies, it is desirable to have a more detailed analysis of how the additional cooling and COP are achieved. The objective herein is to provide a detailed analysis of cooling rate and COP during pulses using a realistically modeled system simulated in SPICE. It was found that cooling rate for long term consecutive pulse cooling applications can be increased over steady-state but COP in most cases is reduced during current pulses. The reasons why this happens are studied in depth.

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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