Enerpool is a program that models the performance of a solar collector when used for a swimming pool. The program allows the user to enter many different specifications, including the type of pool cover used, which months the pool will

F-chart is a solar system analysis and design program written by S.A. Klein and W.A. Beckman, the originators of the F-Chart method. It includes meteo database and database of various collector types (flat-plates, evacuated types...)

Simulation software for solar hot water solar systems (only

Solar thermal energy software Transol is a tool for design, calculation and optimization of solar thermal systems. Transol does dynamic simulation easy (TRNSYS engine) through a user-friendly interface. This tool comes from an

TRNSYS is a flexible graphically based software environment used to simulate the behaviour of transient systems. TRNSYS is made-up of two parts. 
The first is an engine (called the kernel)

Software dedicated to large hot water systems as hotels, industry, camping...

NO MORE AVAILABLE! It has been replaced by TRANSOL, see on Professional solar thermal

SHW is a simulation software for Thermal Solar Systems. It is a freeware for Research and Teaching use.
Designed from unit of Energy Efficient Buildings at the University of Innsbruck, Austria.
No Online help is

This section provide a list of free solar thermal softwares.

This section provide a list of professional and commercial solar thermal softwares.