
PsiValue Calculator (Tool)
The
PsiValue Calculator is used for rapid
calculation of the linear thermal transmittance of the thermal heat bridge
(correction factors Psi (Ψ,
L_{Ψ}, ) resulting from the input of
Uvalues and lengths specific to the building component concerned and its
thermal coupling
coefficient L^{2D} as calculated within a steady state,
two dimensional thermal heat bridge simulation.
Up to two UValue and Length pairs can be entered. The formulas used for this calculation are defined in the EN ISO 10211. Remark: Obtaining the thermal coupling coefficient L2D can be accomplished with an appropriate two dimensional, steady state, thermal bridge heat transfer simulation software. AnTherm provides class A precision method for such calculation. Calculating UValues with UValue Calculator
To
calculate respective UValue with an integrated
UValue Calculator, press
the button "Layered Construct", build or load the layered construct within the
UValue Calculator which
is shown thereafter and confirm the calculated result by pressing the Okbutton
therein. The actual data of a layered construct can be changed at any time by pressing the button "Layered Construct" again and editing the data within the UValue Calculator shown thereafter. Remark: The actual data of a layered construct is retained until the
form is closed. To save the data of each respective layered construct use
the "Save" function within the
UValue Calculator. Entering the Thermal Coupling Coefficient L^{2D} obtained from AnThermAnTherm's "Coupling Coefficients Report" provides the matrix of thermal coupling coefficients resulting from steady state simulation of respective modelled construction. As AnTherm displays both, the interior and exterior calculated values for precision validation purposes, you can either use any one of the two or apply the mean value of both for example, provided that precision criteria is satisfied. Important: UValues and lengths used for the PsiValue calculation must correspond to the thermal coupling coefficient of the modelled component in the manner defined within EN ISO 10211 and EN ISO 13789.
As soon as simulation results of a two dimensional calculation are available or
created in AnTherm you can pick the value of thermal coupling
coefficient from the
coupling coefficients report manually. Remark: The project specific Psi Value Determination Form will pick values automatically as soon as calculation results are available. Entering UValues obtained from AnThermAnTherm's "Modelling Report" shows UValues for all layered constructs at adiabatic cutoff planes of the modelled component. Important: UValues and lengths used for the PsiValue calculation must correspond to the thermal coupling coefficient of the modelled component in the manner defined within EN ISO 10211 and EN ISO 13789. Remark: The project specific Psi Value Determination Form will pick values automatically as soon as calculation results are available. Additional remarks
See also: UValue Calculator (Tool), Coupling Coefficients and Precision report, Project types, PsiValue Determination, Modelling report 
