RadTherm logo.

Thermal modeling program intended for comprehensive heat management design and analysis. RadTherm has powerful capabilities to solve transient solutions for 2D or 3D models in a natural environment, including the effects of direct, diffuse, and reflected solar radiation, thermal radiation, natural or forced convection, and conduction. RadTherm is equipped with everything but YOUR geometry: pre-processing/ set-up, a solver, and post-processor/ viewer. All this is integrated into one carefully designed graphical user interface allowing users from any engineering background to analyze designs very quickly and accurately. Screen Shots


convection, conduction, radiation, weather, solar, transient



Expertise Required

RadTherm is designed to allow users from any engineering background (thermal or other) to analyze designs very quickly and accurately. The intuitive arrangement of the user interface permits both novice and expert users to set up and analyze thermal systems with a minimum of user input.


Over 500 users worldwide. Government, private, and international.


Mechanical engineers, architectural engineers and architects, architect and engineer firms, consulting firms, utilities, federal agencies, research universities, and research laboratories.


All inputs are entered through an intuitive user interface. Starting with a meshed geometry the user assigns groups of elements to different parts. A material and surface condition are then assigned to each part (either keep default values or choose from an editable material database). Finally the user simply assigns boundary conditions: heat loads, convection coefficients (natural wind convection or fluid film), assigned temperatures. For simulation of a natural environment, the user will also choose a weather file. Weather files contain measured information such as geographical location, time, date, wind speed/ direction, air temperature, relative humidity, incident beam and diffuse solar energy, sky temperature, rain rate, etc. The software is also capable of simulating terrain backgrounds and has built in capacity for modeling foliage, snow, asphalt, concrete, swamp, soil, and even water.


Once the model is set up, the integrated solver produces fast results. These results can be either viewed in the built-it post processor or exported.

Computer Platform

Windows, Sun, SGI, HP, and Linux.

Programming Language



The software's greatest advantage for building analysis is it's natural environment capabilities. The software is designed for rapid analysis of solar problems, including heating through windows, HVAC, and insulation modeling. The software features a state-of-the-art voxel-based ray tracer that is used to compute radiation view factors and solar projected (apparent) areas. This ray tracer provides one of the fastest radiation exchange solvers on the market.


High level of user knowledge.



ThermoAnalytics, Inc.


P O Box 66
Calumet, Michigan 49913
United States


+1 (800) 214-3766 +1 (906) 482-9560


+1 (906) 482-9755






Node limited trial versions of both RadTherm and WinTherm are available at the web site.