Next Article in Journal
Randomness of Eigenstates of Many-Body Quantum Systems
Previous Article in Journal
Design of Nano-Structured Micro-Thermoelectric Generator: Load Resistance and Inflections in the Efficiency
Article Menu
Issue 3 (March) cover image

Export Article

Open AccessArticle
Entropy 2019, 21(3), 226; https://doi.org/10.3390/e21030226

Peltier Supercooling in Transient Thermoelectrics: Spatial Temperature Profile and Characteristic Cooling Length

1
Instituto Politecnico Nacional, Depto. Ingenieria Bioquimica, ENCB, Ciudad de Mexico 07738, Mexico
2
Instituto Politecnico Nacional, SEPI ESIME Culhuacan, Ciudad de Mexico 04430, Mexico
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Received: 16 January 2019 / Revised: 19 February 2019 / Accepted: 21 February 2019 / Published: 27 February 2019
(This article belongs to the Section Thermodynamics)
Full-Text   |   PDF [4709 KB, uploaded 27 February 2019]   |  

Abstract

Thermoelectric coolers (TECs) can reach temperatures below that obtained with a steady-state current by applying an electrical current pulse which enables a transitory state in a Peltier device. This effect is known as supercooling. In this paper, we study characteristics parameters, such as the minimum cooling temperature and spatial temperature profile, in a TEC operated under current pulses and a cooling load ( Q c ) . Numerical analysis for a one-dimensional thermoelectric model of the cooling system is developed, and a novel MATLAB programming code is proposed for the transient state based on finite element analysis. We also investigate the influence of the thermoelement’s length upon the cooling mechanism. A new parameter called the “characteristic cooling length” is proposed to describe the length in which the minimum cooling temperature occurs along the elements of a TEM. Results show the transient temperature profiles along the elements of the semiconductor P-type element, and a “characteristic cooling length” is characterized. We also propose a general principle, and the lowest cooling temperature values are obtained for a semiconductor’s small length and variable pulse cooling load under current pulse operation. The present study will serve as guidance for the geometric design of TECs under current pulse operations. View Full-Text
Keywords: supercooling; thermoelectric; Peltier; pulse current; transitory supercooling; thermoelectric; Peltier; pulse current; transitory
Figures

Graphical abstract

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Ruiz-Ortega, P.E.; Olivares-Robles, M.A. Peltier Supercooling in Transient Thermoelectrics: Spatial Temperature Profile and Characteristic Cooling Length. Entropy 2019, 21, 226.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Entropy EISSN 1099-4300 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top