University of Wisconsin-Madison Skip navigationUW-Madison Home PageMy UW-MadisonSearch UW


Additional Resources:


TRNSYS 18 Add-ons

The following products extend the capabilities of TRNSYS:


TRNSYS thermal mutlizone building model, type 56, requires air flows between zones as input values. However, in natural ventilation systems these depend on the wind pressures and the inside and outside temperatures. To account for this situation, a coupling with an air flow model is absolutely necessary.

TRNFLOW integrates the multi-zone air flow model COMIS into the type 56. An internal solver, optimized for this task,  iterates in each time step between the two models until their solutions are consistent. The existing GUI TRNBuild was extended in such a way that data for the air flow model can be entered. Thus a user-friendly handling of the coupling is assured. With TRNFLOW, a immense step forward has been made for building simulation with TRNSYS.

More information:


Thermal Energy System Specialists (TESS) of Madison, Wisconsin has developed new component libraries for the popular TRNSYS simulation software. Each of the components in these new libraries has been extensively tested and comes complete with on-line documentation, source code, and free technical support for 1 year from the date of purchase. Each of these libraries comes in the Simulation Studio front-end format for TRNSYS (source code, documentation, on-line help, icon, etc.) The source code is provided for each of these models so that they can be quickly and easily modified if the user wishes to make changes to the model. Each of the component libraries comes with one or more sample projects that demonstrate typical uses of the component models found in that library. TESS currently has fourteen component libraries for sale.

More information : TESS website

TRNSYS User Resources

The following resources are freely available for TRNSYS users.

TRNSYS – Tutorials and Examples

More information: TRNSYS 18 Tutorials


User written components for TRNSYS that are publically available.

More information : TRNLib

TRNSYS on facebook

TRNSYS is now on facebook! Stay up to date with the latest happenings in the TRNSYS Community.

More information :

TRNSYS on LinkedIn

More information : TRNSYS on LinkedIn

TRNSYS Frequently Asked Questions

More information : TRNSYS FAQ's

TRNSYS-Users Mailing List

More information including archive search : TRNSYS-Users Mailing List

Weather Data Information

Information and resources for the various weather data file formats.

More information : Weather Data

Software Based on TRNSYS


Thermal Energy System Specialists (TESS) uses a tool of the TRNSYS package called TRNSED to create stand-alone TRNSYS based applications for end-users that are not TRNSYS savvy. These TRNSED applications hide the fine details of the TRNSYS simulations to display only the relevant information to the end-user in a similar fashion of a website. All TRNSYS users have the ability to also create these applications with the TRNEdit tool in the TRNSYS package.

More information: TESS Software Development   


User interface for quick and easy simulations of thermal solar energy systems.  Based on TRNSYS, it is intended to be used for sizing the required equipment for a solar domestic hot water systems. It is possible to create up to 138 different configurations.

More information:   

TRNSYS FMU Export Utility

The TRNSYS FMU Export Utility is an openly available stand-alone tool for exporting FMUs for Co-Simulation from TRNSYS 17 models. Among other things, this tool allows to link TRNSYS 17 at runtime with Modelica or Simulink models. The tool supports FMI version 1.0 and 2.0 and provides a graphical user interface for generating FMUs for Co-Simulation.

More information:

NIST TRNSYS/Java coupler

Type277 utilizes socket communication to provide loosely-coupled integration between TRNSYS and Java-based components. Bi-directional flow of information is facilitated using the client-server architecture of Java. Type277 is compiled as both a 32-bit and 64-bit dynamic link library to support co-simulation with TRNSYS17 and TRNSYS18 projects. An application of Type277 is demonstrated by modifying an example TRNSYS project.

The Java project and files, TRNSYS modified example projects, and Type277 dynamic link libraries can be downloaded from the NIST GitHub site:

Mechanical Engineering Department | UW Home