SHW - Simulation Software for Thermal Solar Systems

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 available.
Volunteers for translating the menues and the help to other languages are welcome.
For the moment, reports are only available in german.
Real Bugs or ideas for improvement can be reported to wolfgang.streicher(at)
SHW - Simulation Software for Thermal Solar Systems


Userfriendly online solar Calculation and Simulation ooventropf solar thermal systems with Oventrop solar panels.
For domestic and commercial pre-sizing.
Results: Solar Yield, Solar Fraction, Efficiency, Collector Area, Storage Tank Volume.
Worldwide climate database.
Oventrop solar software


Kalkener's online solar simulation software allows calculating solar thermal water heating systems:
the sizing of its main components according to the monthly, weekly and daily hot water consumption profiles, the solar site survey, the shading, orientation and tilt losses, the optimal position of solar collectors located on sloped roofs, the annual solar energy production (taking in account losses) and its key profitability indicators, (IRR and NPV).
The aim of this software is to calculate in an accurate, fast and cheap way all the neccesary data in order to make the proper decision on whether or not to invest in this type of facilities.
KALKENER Solar thermal software


SCAN THE SUN, Solar collector software

ScanTheSun app calculates best direction and insolation of a solar collector panels

taking into account surrounding trees, buildings or other sources of shading.
ScanTheSun allows to :

- calculate the solar energy reaching the collector

- find the energy loss due to shadow casted by objects in the vicinity

- plan the thermal collectors mounting (selection of the best part of the roof, proper panels orientation) even in a complicated urban areas

- calculate the hours of hot water warming or electric energy production during the day - prepare a complex documentation of insolation and efficiency of solar installations

Get ScanTheSun on in Google Play Store

Short screen-recorded presentation of ScanTheSun :


Viessman ESOP Online for Viessman collectors and systems. Online Solar Calculation and Simulation of Solar Thermal Systems.
Results: Solar Yield, Solar Fraction, Efficiency, Collector Area, Storage Tank Volume.
 Viessmann solar software


Retscreen-solar-heating-simulation-software RETScreen 4 is a free Excel-based clean energy project analysis software tool that helps decision makers quickly and inexpensively determine the technical and financial viability of potential renewable energy, energy efficiency and cogeneration projects. 


Free online sizing software to calculate hot solar water systems output.
This software compute the energy output according to location, water needs, type and volume of water tank, collectors area, slope and azimut.

Worlwide climate database.
Languages : english, french, spanish, german.


It is available online for free on TECSOL website (only available in french).
SOLO online on TECSOL Website


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

NO MORE AVAILABLE! It has been replaced by TRANSOL, see on List of solar thermal professional


Solar Water Heating Calculation for built up system Note to Users: California F-Chart has been designed to calculate solar thermal water heating contributions for built up solar systems. The solar fraction generated are based on compliance with the building energy efficiency standards and should not be used for any other purpose.
CEC F Chart

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