Thermal management optimization of a thermoelectric-integrated methanol evaporator using a compact CFD modeling approach

Xin Gao, Min Chen, G. Jeffrey Snyder, Søren Juhl Andreasen, Søren Knudsen Kær

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

To better manage the magnitude and direction of the heat flux in an exchanger-based methanol evaporator of a fuel cell system, thermoelectric (TE) modules can be deployed as TE heat flux regulators (TERs). The performance of the TE-integrated evaporator is strongly influenced by its heat exchange structure. The structure transfers the fuel cell exhaust heat to the evaporation chamber to evaporate the methanol, where TE modules are installed in between to facilitate the heat regulation. In this work, firstly, a numerical study is conducted to determine the working currents and working modes of the TERs under the system working condition fluctuations and during the system cold start. A three-dimensional evaporator model is generated in ANSYS FLUENT® by combining a compact TE model with various heat exchange structure geometries. The compact TE model can dramatically improve the computational efficiency and uses a different material property acquisition method based on module manufacturers' datasheets. Secondly, a simulation study is carried out on the novel evaporator to minimize its thermal resistance and to assess the evaporator pressure drop. The factors studied include the type of fins in the heat exchange structure, the thickness of the fins, the axial conduction penalty, etc. Results show that the TE-integrated evaporator can work more efficiently and smoothly during both load fluctuations and system cold start, offering superior performance.

Original languageEnglish (US)
Pages (from-to)2035-2042
Number of pages8
JournalJournal of Electronic Materials
Volume42
Issue number7
DOIs
StatePublished - Jul 1 2013

Keywords

  • TE-integrated methanol evaporator
  • Thermoelectric heat regulator
  • compact TE model
  • heat loss
  • heat regulation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Thermal management optimization of a thermoelectric-integrated methanol evaporator using a compact CFD modeling approach'. Together they form a unique fingerprint.

  • Cite this