Our thermal bridge simulator, Mold Simulator 2.1.3, is out with a bunch of changes and bug fixes:

  • volumetric mass and specific heat can be temperature-dependant (Dynamic);
  • X-Y curve factors for humidity (Dynamic);
  • GUI improvements on Mac OSX version;
  • various bug fixes.

Mold Simulator is available for Windows and Mac OSX; the new viewer version can be downloaded from thermal bridge page.

We are pleased to announce that Frame Simualtor, our window thermal transmittance simulator (for Windows and Mac OSX), version 2.1.2 is out! Here you are the list of major changes:


  • insulation panel’s cross element now considers the real width;
  • border and minimum with options for table tags;
  • various bug fixes.

The new viewer can be downloaded at Frame Simulator | Window Transmittance.

We’re pleased to announce that Brick Simulator is now fully compliant with brand new EN 1745 2012.

Frame Composer, our EN ISO 10077-1 window transmittance simulator (for Windows and Mac OSX) version 2.0.0 is out! Here you are the list of major changes:

  • completely new report system;
  • curved elements;
  • label tool;
  • new GUI;
  • freehand mode.

Please go to Frame Composer page for more information.

Frame Simualtor, our window transmittance simulator (for Windows and Mac OSX) version 2.0.9 is out! Here you are the list of major changes:


  • settings file can be saved to a custom folder;
  • conditional labels;
  • improved printed viewports;
  • import/export more than one texture a time;
  • views window minimized at run time;
  • various bug fixes.

The new viewer can be downloaded at Frame Simulator | Window Transmittance.

We’re very pleased to announce that Mold Simulator, our thermal bridge simulator (for Windows and Mac OSX) 2.0.9 is out. Here you are what’s new:


  • settings file can be saved to a custom folder;
  • conditional labels;
  • improved printed viewports;
  • import/export more than one texture a time;
  • views window minimized at run time;
  • various bug fixes.

The new viewer can be downloaded at Mold Simulator | Thermal Bridge.

Thermal Lag - T0

In this article we’ll discuss thermal lag, an important value to take under consideration when analyzing walls and, more in general, building structures. We’ll use our thermal bridge FEM software, Mold Simulator Dynamic, to compute thermal lag in accordance with EN ISO 13786.

In case of simple structures (i.e. a set of homogeneous layers) thermal lag can be analytically evaluated using EN ISO 13786 formulae, but in more general situations a FEM simulation is required.
Thermal lag represents a structure’s thermal mass in terms of time; to make it simple, it’s how long it takes to the heat wave to pass through a building structure.

 

Thermal Lag - T0Thermal Lag - T1
T0: time when temperature is at its maximum on external surface. A sinusoidal heat wave is applied to external surface.T1: time when temperature is at its maximum on internal surface. The heat wave has been delayed and faded.

Thermal lag = T1 – T0 in hours

To have a better understanding of this subject please download this sample for Mold Simulator Dynamic:

You need Mold Simulator Viewer (free) to open it.

Thermal Bridge - Real

In this brief tutorial we’ll show you how to computer linear thermal transmittance of a typical thermal bridge: a junction between a wall and a floor. We’ll use Mold Simulator as FEM software for its analysis.

Thermal bridge

Thermal Bridge

The structure is in contact with external environment (on the left) and internal environment (on the right).
In this case, the thermal bridge is caused by floor; a way to evaluate it is to compute its linear thermal transmittance, ψ (psi) in W/mK.

Linear thermal transmittance
This value represents the difference between the theoretical configuration (just a wall) and the real one (a wall with an intersecting floor).

Theoretical configurationReal configuration
Thermal Bridge - TheoricalThermal Bridge - Real
Wall length (l): 1.1 m
Wall transmittance (U): 1.0980 W/m²K (computed simply considering wall’s material properties)
Thermal conductance (L2D): U x l = 1.2078 W/mK
Wall length (l): 1.1 m
Wall transmittance (U): 1.2548 W/m²K (FEM simulation with Mold Simulator)
Thermal conductance (L2D): U x l = 1.3803 W/mK (FEM simulation with Mold Simulator)

Thermal bridge ψ = 1.3803 – 1.2078 = 0.1725 W/mK
You can watch an interactive presentation of this tutorial downloading the project:

You need Mold Simulator Viewer (free) in order to view it.

Isotherms

This is the second part of a tutorial about window transmittance computation using Frame Simulator, our FEM simulator available for Windows and Mac OS X. For the first part, please see Window Transmittance – part 1.

In this tutorial we’ll use the following abbreviations:

  • LMB = left mouse button click;
  • MMB = middle mouse button click;
  • RMB = right mouse button click.

Borders definition
Please click “Boundary” tab and select “Internal”; now click on Assign boundary strip button and LMB over one of the lines in contact with intern environment. Similarly, select “External” please click Assign boundary strip button and LMB over one of the lines in contact with extern environment.
In current project, borders should look in this way:

Boundary

Moreover, please make sure to have selected Heat flow direction down flow direction in “Lines” tab.

Simulation
Please click “Simulation” tab and wait that the software performs all the necessary computations. At this point, you can select different types of view: heat flow, temperature, isotherms, etc.
The values required by ISO 10077-2 standard, window transmittance and Lf2D, are shown in “Results” table.

Isotherms

As you have seen, the way to window transmittance following ISO 10077-2 standard is extremely easy with Frame Simulator. We’re planning some more tutorials and articles, so stay tuned!