Transient Numerical Simulation of Linear Thermal Transmittance in Software CalA

Josef Plášek; Ondrej Sikula

doi:10.4028/www.scientific.net/AMR.1041.277

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 1041Transient Numerical Simulation of Linear Thermal...

Transient Numerical Simulation of Linear Thermal Transmittance in Software CalA

Abstract:

Calculation of heat losses of buildings according to European standard EN ISO 10211 and Czech standard ČSN 73 0540 is simplified to one-dimensional time-steady heat conduction through the building construction in direction of the largest temperature gradient. This simplification of the calculation is incorrect in case of complex geometry. Calculation according to norm takes into account this inaccuracy and uses Linear Thermal Transmittance Ψ [W/(m·K)] in 2D geometry or Point Thermal Transmittance χ [W/(m2·K)] in the 3D geometry as a calculation correction. This contribution is focused on detailed calculation of linear thermal transmittance in case of contact external peripheral wall and plastic window frame. Results of two-dimensional transient numerical simulation show unsteady linear thermal transmittance in time and dependence on solar radiation. All of these variable boundary conditions can be easily simulated in the software CalA as well as complex geometry.

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Periodical:

Advanced Materials Research (Volume 1041)

Pages:

277-280

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1041.277

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Online since:

October 2014

Authors:

Josef Plášek*, Ondrej Sikula

Keywords:

Linear Thermal Transmittance, Software CalA, Transient Numerical Simulation

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References

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