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.
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