Two dimensional mathematical model of heat-transmission in building structures

From nanotechnology-based thermal insulation materials nano-ceramic thermal insulation coatings are generally considered to be the most critical because of contradictory technical data that could be founded in special literature. Complete agreement had not been already found about the mechanism how does their insulating effect take. In the Laboratory of Building Materials and Building Physics at Széchenyi István University (GyĘr, Hungary) several thermodynamic tests were made in order to find out thermodynamic process inside this material. Several building structures with different order of layers were tested with heat flow meter. Results showed that convective heat transfer coefficient cannot be taken account in usual way using this material as thermal insulation.

Section: Nanotechnology-based Thermal Insulation Materials In Architementioning

confidence: 99%

Thermodynamic tests with nano-ceramic thermal insulation coatings

Bozsaky¹

2017

“…the surface integral of the calculated heat flux densities at the boundaries) it is easy to calculate the precise thermal transmittance of the investigated details. A good summary of the different numerical calculation approaches to thermal bridge simulations is found in [3], see also [4].…”

Section: Bakonyi G Dobszaymentioning

confidence: 99%

“…the Σl/A value, the thermal resistance of the insulation, the wall, etc. ); 6) Check the accuracy of the result by comparing the values calculated in point 4) and the ones calculated with the method derived in point 5).…”

Section: Table Imentioning

confidence: 99%

Simplified calculation of non-repeating thermal bridges of the typical Central-European small suburban houses

Bakonyi¹,

Dobszay²

2016

A new calculation method for deriving easy-to-use equations for the simplified calculation of non-repeating thermal bridges is presented and tested on several constructional variants of a common Central-Europe building type. Through the identification the main parameters affecting the difference between the one-and multidimensional heat transfer coefficients of facades their number is reducible. The method's accuracy compares favorably to current calculations. A new formulation is introduced for the calculation of the total heat transfer coefficient of the external thermal envelope incorporating the proposed simplified thermal bridge calculation method and the window's in-situ heat transfer coefficients.

“…Only one exception has to be made, because the capital I in Maple is reserved for the imaginary unit, so the capital J is used instead. The detailed description of usage and programming of Maple can be found in [3] and [4], while [5] and [6] give examples of how Maple can be used in engineering calculations.…”

Section: Introductionmentioning

confidence: 99%

On buckling of axially functionally graded beams

Maróti¹,

Elishakoff²

2012

Abstract:In his study Aydogdu analyzed the vibration and buckling of axially functionally graded simply supported beams. By using pre-defined frequency and buckling loads he determined the Young's modulus in axial direction as a function of axial coordinate. In this study it is demonstrated that there is error in his calculation; moreover, corrected computation is presented and the right solution of the ODE is visualized. It is pointed out that the method used by Aydogdu is apparently not applicable for the solution of the problem at hand.