Thermal Management of Heating Processes – Measuring Heat Transfer Properties

Holger Friedrich, Friedrich Raether, Jens Baber

Fraunhofer Center for High Temperature Materials and Design (HTL), 95448 Bayreuth/Germany

Revision

Volume 11, Issue 2, Pages 59 - 65

Abstract

The design of any heating process is based on a careful thermal management of heat transfer. A necessary prerequisite for this thermal management is the precise knowledge of thermal material properties. Need for improvements exist especially at high temperatures, where measurements of quantities like thermal conductivity or specifc heat are diffcult. Special thermooptical devices have been developed to provide these data. Concepts and examples are presented in this report. They are compared to customary measuring methods. Regarding greenhouse gas emissions action is required to develop new heating processes for sustainable production of energy intensive products. This includes furnace construction, high temperature components and process parameters. The measurement of heat transfer properties is an important part of this development.

Keywords

heat transfer, thermal management, thermo­optical measuring devices

References

[1] Parker, W.J.; et al.: Flash method of determining thermal diffusivity, heat capacity, and thermal conductivity. J. Applied Phys. 32 (1961) 1679–1684 [2] Raether, F.; et al.: A novel thermooptical measuring system for the in situ study of sintering processes. J. Therm. Anal. Calorim. 53 (1998) 717–735 [3] Raether, F.; Klimera, A.; Baber, J.: In situ measurement and simulation of temperature and stress gradients during sintering of large cer­amic components. Ceramics Int. 34 (2007) 385–389 [4] Devices for thermal analysis, company Netzsch, www.netzsch­thermal­analysis.com [5] Wulf, R.: Wärmeleitfähigkeit von hitzebeständigen und feuerfesten Dämmstoffen – Untersuchungen zu Ursachen für unterschiedliche Messergebnisse bei Verwendung verschiedener Messverfahren. Dissertation, Bergakademie Freiberg 2009 [6] Log, T.; Gustafsson, S.E.: Transient plane source (TPS) technique for measuring thermal transport properties of building materials. Fire Mater. 19 (1995) 43–49 [7] Brendel, H.; Seifert, G.; Raether. F.: Determination of thermal diffusivity of fbrous insulating materials at high temperatures by thermal wave analysis. Int. J. Heat & Mass Transfer 108 (2017) Part B , 2514­2522 [8] Köver, M.; et al.: Determination of the specifc heat using laser fash apparatus. J. Therm. Anal. Calorim. 122 (2015) 151–156 [9] Honner, M.; Honnerova, P.: Survey of emissivity measurement by radiometric methods. Appl. Optics 54 (2015) 669–683 [10] Raether, F. (ed.): Nachhaltige Wärmeprozesse systematisch entwickeln. Frankfurt 2018, www.htl­enertherm.eu [11] www.ak ­thermophysik.de/download/ringvergleiche/Messbericht%20Ringversuch%20 2015_2.pdf [12] Seifert, G.; Raether, F.; Baber, J.: A new device for measuring hot thermal shock, thermal cycling and other high temperature properties of refractories. refractories WORLDFORUM 10 (2018) 77–80

Copyright

Göller Verlag GmbH