TY - JOUR

T1 - Influence of axial heat conduction in solid walls and fins on the overall thermal performance of an additively manufactured high-temperature heat exchanger

AU - Fuchs, Marco

AU - Luo, Xing

AU - Kabelac, Stephan

N1 - Funding Information: The authors gratefully acknowledge the financial support by the Federal Ministry of Transport and Digital Infrastructure, Germany, (BMVI, grant ID 03B10605H) and the coordination of the MultiSchIBZ project by the National Organisation Hydrogen and Fuel Cell Technology, Germany (NOW GmbH, grant ID 03B1060). The authors also gratefully thank Dr.-Ing. Wolfgang Bender from Hülsenbusch Apparatebau GmbH & C. KG and M.Eng. Philipp Schwarz from Rosswag GmbH for providing the heat exchanger for experimental testing.

PY - 2022/7/25

Y1 - 2022/7/25

N2 - Due to the increasing use of high-temperature processes in mobile applications, the demand for compact and efficient high-temperature heat exchangers continues to rise. However, with increasingly reduced installation space, the parasitic effect of axial heat conduction in the wall material of the heat exchanger is also gaining considerable influence. In this manuscript, the influence of axial heat conduction in the wall and fin material on the thermal performance of an additively manufactured high temperature heat exchanger is to be examined. For this purpose, an analytical calculation model as well as the analytical solution method is presented and successfully validated by means of experimentally recorded measurement data of an additively manufactured heat exchanger, which was tested at temperatures up to 750 °C. Subsequently, the calculation programme is used to determine the influence of the axial heat conduction on the effectiveness as well as on the NTU value of an additively manufactured Plate-Fin heat exchanger. The results show a drop in the NTU value of up to 50% at balanced flow compared to the case without heat conduction, which reduces the effectiveness and thus the performance of the heat exchanger by up to 5.5%.

AB - Due to the increasing use of high-temperature processes in mobile applications, the demand for compact and efficient high-temperature heat exchangers continues to rise. However, with increasingly reduced installation space, the parasitic effect of axial heat conduction in the wall material of the heat exchanger is also gaining considerable influence. In this manuscript, the influence of axial heat conduction in the wall and fin material on the thermal performance of an additively manufactured high temperature heat exchanger is to be examined. For this purpose, an analytical calculation model as well as the analytical solution method is presented and successfully validated by means of experimentally recorded measurement data of an additively manufactured heat exchanger, which was tested at temperatures up to 750 °C. Subsequently, the calculation programme is used to determine the influence of the axial heat conduction on the effectiveness as well as on the NTU value of an additively manufactured Plate-Fin heat exchanger. The results show a drop in the NTU value of up to 50% at balanced flow compared to the case without heat conduction, which reduces the effectiveness and thus the performance of the heat exchanger by up to 5.5%.

KW - Additive manufacturing

KW - Axial heat conduction

KW - Compact plate-fin

KW - Experimental testing

KW - High temperature

UR - http://www.scopus.com/inward/record.url?scp=85131259272&partnerID=8YFLogxK

U2 - 10.1016/j.applthermaleng.2022.118566

DO - 10.1016/j.applthermaleng.2022.118566

M3 - Article

AN - SCOPUS:85131259272

VL - 212

JO - Applied thermal engineering

JF - Applied thermal engineering

SN - 1359-4311

M1 - 118566

ER -