A TRaNsient SYstems Simulation Program



TRNSYS is a transient systems simulation program with a modular structure. It recognizes a system description language in which the user specifies the components that constitute the system and the manner in which they are connected. The TRNSYS library includes many of the components commonly found in thermal and electrical energy systems, as well as component routines to handle input of weather data or other time-dependent forcing functions and output of simulation results. The modular nature of TRNSYS gives the program tremendous flexibility, and facilitates the addition to the program of mathematical models not included in the standard TRNSYS library. TRNSYS is well suited to detailed analyses of any system whose behavior is dependent on the passage of time. TRNSYS has become reference software for researchers and engineers around the world. Main applications include: solar systems (solar thermal and photovoltaic systems), low energy buildings and HVAC systems, renewable energy systems, cogeneration, fuel cells.

TRNSYS was developed in the mid-1970s by Dr Sanford Klein at the Solar Energy Laboratory at the University of Wisconsin – Madison.

TRNSYS 18.0 was released in April 2017. The current release is 18.05.0001 released in March 2023. Click here for a PDF of more detailed information about the release (Version 18.0).

This website is under development. Please visit the existing official SEL TRNSYS website for more information.