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### Numerical analysis of potential heat losses reduction for insulated cover of tire curing presses

 Citace: HYNEK, M., VOTÁPEK, P. Numerical analysis of potential heat losses reduction for insulated cover of tire curing presses. In Pres 2012. Praha: Orgit, 2012. s. 1-10. ISBN: 978-80-905035-1-9 STAŤ VE SBORNÍKU eng Numerical analysis of potential heat losses reduction for insulated cover of tire curing presses 2012 Praha Orgit Doc. Ing. Martin Hynek Ph.D. , Ing. Petr Votápek This paper presents the results of numerical calculations of thermal fields in the cover of tire curing presses. Regardless of what type of a rubber curing chamber is used (steam curing press or mould with heated plates) it is reasonable to insulate the chamber cover properly. However, quite often the heat losses through the joints of the metal parts of the chamber cover are neglected or at least underestimated. Numerical analyses can help in an effort to estimate the thermal fields and thus provide a mighty tool for proposing desirable design changes. One of the biggest difficulties in the setting of a thermal problem is the estimation of heat transfer coefficients on the surface of a real structure where typically both natural and forced convection take place. Moreover, thermal boundary layer always coexists with velocity boundary layer and together they govern the heat transfer from the surface. From numerical point of view, specifying the parameters for a thermal boundary condition determines the temperature distribution in the structure as well as on its surface. In other words, setting improper thermal boundary conditions unavoidably leads to misleading results. In this paper, we summarize a possible way around this problem. Instead of strict specification of convection boundary condition it is proposed to incorporate a simple thermal boundary layer based only on heat conduction law into the analyzed domain. By this modification no boundary conditions need to be prescribed on the surface of the analyzed structure and hence the resulting temperature distribution has more freedom to classify the actual design of the analyzed structure. Once the temperature distribution on the surface is known for various designs it is possible to compare them qualitatively and to assess the level of potential heat losses reduction.

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