Clash conflict tools

[Google translated]

As there, one of the greatest virtues that provides the representation of buildings in a three dimensional format is the ability to pre-visualize a pre-construction phase the possible disagreements in the future construction. For the part I played in MEP models, I have to coordinate all the systems together, coordinate the same facilities with the proposed structure avoiding collisions with beams, columns, or other structural element and coordinate certain steps needs Vertical or horizontal stroke caused by the pipes, ducts or trays.

This implies an exercise in communication with the parties involved in the project, both with people from my office and with external partners such as architects or steel construction. I’m always talking about a project design phase, the first moves of the chess game, in more advanced stages are other characters such as project managers, construction managers, etc..

At the end of a lot of coordination and communication that you had reached the moment of truth, the moment model revision. The most laborious part of this review, in my opinion, is the detection of collisions between elements. I have worked closely with the architect and the reporting structure only changes we have been doing in our respetivos models but still there is always something you miss. In most cases it is the sag of the beams, a recalculation may have increased and are now colliding with my air ducts.

I know that Revit incorporates that option so dear “Interference Chek” but honestly turns me off that long list of items that I have to select and give the little button for Show me frame the element itself, what I want is an overview, something more visual, more agile to discover, so my intention was to go to other software to serve my needs.

For part of the solution Autodesk Navisworks we of course offers a full palette of tools for detecting collisions apart from being the most popular among users of Revit.

The purpose of today’s article is to present a tool similar to Navisworks, more limited in features but for my needs it works beautifully. The well-known house Tekla provides this tool free of charge and the truth is that it works very well managed both for collisions and for the review of our models, yes, based on the models exported in IFC format. Each collision is marked with a symbol on the three-dimensional model is therefore just what I wanted, something that at first detect the most problematic, of course corrections have to do with the Revit but it serves to achieve my initial goal.

Worth trying.



Knowing well the weather station data that Revit will use for calculating the thermal demand is the amount, as it allows us modify it and check that come by default.

In the following video is this consultation and edition:


The dialogue “location” located on the “manage” we will serve to geographically locate the project. When defining this location we will have 2 options:


1. – Internet mapping service

2. – Default city list


We must remember that the Internet Mapping service option should be used for the conceptual design, while Default City List is the right choice for a thermal load calculation, as we ensure that meteorological data are part of the World Meteorological Organization.

Building infiltration class

In the calculation of thermal loads Revit MEP offers us the possibility of regulating the flow due to infiltration. This rate with respect is regulated in three steps:


loose = 1,38 m³/h x m² – (0,076 CFM/Sq x ft)

medium = 0,69 m³/h x m² – (0,038 CFM/Sq x ft)

tight = 0,34 m³/h x m² – (0,019 CFM/Sq x ft)

none = 0 m³/h x m² – (0 CFM/Sq x ft)


It is important to remember that the surface on which Revit calculates wall surface is in contact with the outside. Here’s a video showing the comments:

Systemair Plug-in for AHU selection

Few manufacturers have developed their product catalogs for Revi MEP and in this post we talk about Systemair. Unlike others they didn’t send a huge full of families arranged at their discretion but a selection software for the AHU units and a plug-in for Revit that imports the file generated, as a family, in our project.

In the version I tested the families exported only had information about the  air connectors although the families parameters are not yet linked to the connector parameters.

The hydraulic parameters are not yet included, honestly do not understand why you skipped. As for the electrical parameters, as Systemair, not included by the installation of the equipment in situ are not typical configurations but still electricity consumption unchanged.

Manage the selection program has some difficulty and we leave Systemair experts who choose the conditioner that best suits our needs and send together with the financial offer SystemaAirCad file. For now this workflow is that we should lower.

Install the software

From their official website we download and install the software SystemairCAD selection, we will find in the “Global / Support / Software tools / SystemairCAD”. On the same page we have instructions on installing the plug-in for Autodesk Revit


SystemairCAD is able to export a DMR file of a 3D CAD model.

A small plug-in have to be installed, to import the 3D model to Autodesk Revit.

The import plug-in together with instructions how to install it can be downloaded via the following link:

The purpose of the connection is to add Systemair air handling units selected with SystemairCAD into MagiCAD for Revit or Revit project and drawing.


Import an AHU

The plug-in offers two options for importing an air conditioner but we are going to focus only on the second, importing a file. “dmr” exported from SystemairCAD.

On the same page to download the plug-in found the Systemair Revit Plugin – Users Guide.pdf with details about the different ways available to import.


Building construction

Possibly the most important parameter in the calculation time of the thermal loads, and that from this are the thermal properties to assign each of the openings and closings of the building.

dialeg building construction

There are two possible options:


This is the ideal situation. Here we should not incorporate any value in dialogue “building construction” and should be:

build constr. sense override


In this situation use dialogue to incorporate thermal properties we want to have each of the different closures and openings. In this way, each and every component of the building will inherit the properties we have chosen.

We can find the ability to have certain areas of the building that their closing properties differ from those specified generically to the entire building in the dialogue “building construction”, in this case, and without leaving the dialog “heating and cooling loads “We must use the tab” details “, here you can edit the characteristics of each individual space.


If we open the dialogue “construction type” of a specific space, we see the dialog that opens is almost identical to what we used to edit the properties of the whole building enclosures, here we can create templates that we want (I have created with the name “prueba”) and use it to the spaces we want.

construction type

Default is loaded a template with the name “building”, the properties of enclosures that template can not be edited, as are the values ​​we have awarded anteriomente in dialogue “building construction”.

In the two scenarios that have been raised above will always find a way to force the desired thermal properties by “clicking” on the override box column.