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Dynamic thermal Simulation Program for Designing and Optimizing Solar Thermal Systems


T*SOL® is the simulation program that allows you to  accurately calculate the yield of a solar thermal system dynamically over the annual cycle.

With T*SOL® you can optimally design solar thermal systems, dimension collector arrays and storage tanks, and calculate the economic efficiency.

  • All relevant systems and company systems
  • Components: combination tanks, buffer tanks, domestic hot water supply, heating support, swimming pools, process heating, air collectors
  • One or two collector arrays
  • Climate data for 8,000 locations worldwide and your own climate data
  • Photo Plan: dimensioning and photorealistic presentation of the potential solar thermal system on the roof
  • Projects with multiple system variants
  • Solar fractions for heating and domestic hot water shown separately
  • User groups: sollar installers, designers and heating engineers

T*SOL® offers you around 200 preconfigured systems and extensive automatic design assistance. And you can of course also enter all the technical parameters individually.

System Requirements

T*SOL englisch

  • Internet Access
  • Processor: 1,5 GHz Pentium PC
  • Memory: 512 MB
  • Hard Disk Drive: 820 MB
  • Monitor Resolution: at least 1.024 x 768 pixel
  • Operating System: Windows Vista, Windows 7, Windows 8, Windows 10
  • Graphics: 64 MB, OpenGL – Support (Photo Plan)
  • Other: Microsoft .Net Framework 4.5.2 Redistributable Package

Program Details

Create User-defined Storage Tanks

As already known from the collectors and boilers, it is now also possible to create, save and edit storage tanks in T*SOL. The newly.-created storage tank can be used in all compatible systems. This ranges from mono- and bivalent tanks to buffer and combination tanks.

Parameter Variation with Financial Results

With the new financial results (present net value, return and cost of solar energy) you can evaluate and optimize your solar system with respect to economic aspects.

Redesign of the Database User Interface

The database user interface has been redesigned completely. The workflow for adding, selecting and editing products (solar thermal collectors, boilers and solar air collectors) is now considerably enhanced and even faster.

Additional System for Process Heating

In the new system "P3 – Preheating with buffer tank" you have the option to connect up to 6 collector circuits and up to 6 different consumers (process heating, domestic hot water and space heating).

Extra Program Languages: Polish and Hungarian

Polish and Hungarian have been added as new program languages. T*SOL users can now work in the following languages:

  • English, German, French, Hungarian, Italian, Polish, Spanish

And the project reports come in:

  • Croatian, Czech, German, English, French, Hungarian, Italian, Polish, Portuguese, Romanian, Slovak, Slovenian, Spanish
Output of an Energy Label

Since September 26, 2015, the energy labeling of heating appliances for space heating and hot water systems is mandatory for all manufacturers, traders and craftsmen. T*SOL® simulates the energy efficiency of solar thermal heating systems and generates the required energy label.

Comparison of Variants

Compare up to 6 variations in its components and characteristics. The selected variants are shown in a table. You will get information about the global radiation, the requirements of the domestic hot water, heating, collector circuit, built-in storage, auxiliary heating and the simulation results.


The dynamic annual simulation calculates temperatures and energy in intervals of one to six minutes. During simulation you can display the temperature of the system components in color. System parameters such as efficiency and solar fraction are calculated from the simulation results .    

  • The Design Assistant now also uses a minute-step simulation 
  • The additional design aid  calculates optimal collector area, storage tank volume and boiler performance.
System Optimization by Parameter Variation

You can vary one or two parameters at once to find out at which values the combination of "Efficiency", "Solar fraction", "Additional energy" and/or "solar yield" is optimal.

Photo Dimensioning with Photo Plan

The integrated photo dimensioning programme Photo Plan is a visualization tool to quickly and easily create your customer’s roof. With a photo and a reference dimension, the roof and the planned collector array can be presented photorealistically. The program can also determine all essential roof dimensions. You only need a few minutes to create your customer’s roof with its very own PV system, according to your customer’s wishes. Photo Plan is therefore a great tool to help home owners make the right decision!

Financial Analysis

T*SOL® calculates the economic efficiency of a solar thermal system, including the following: 

  • Capital value, amortization period and solar production costs (heat price)
  • Modified internal rate of return, profit accounting for reinvenstment
  • Return on equity, return on assets, internal rate of return and return on capital
  • Solar fractions for heating and domestic hot water shown separately
T*SOL - Collector Database

T*SOL® provides you with a database containing almost 3,500 flat-plate and evacuated tube collectors. Individual collectors can be simulated as required by entering the conversion factor, specific heat capacity, heat transfer coefficient, and incident angle modifier. A special feature is the simulation of evacuated tube collectors with or without reflectors.

T*SOL - Swimming Pool and Large-Scale Systems

T*SOL includes the following swimming pool and large-scale systems:

  • Swimming pool (17 systems, plus 30 company systems)
  • Large-scale systems (9 systems, plus 11 company systems)

The simulation algorithmms for the swimming pool systems have been revised and calculate even more precisely.

Air collector systems

The building data and ventilation parameters for the planning and yield forecast of air collector systems were produced in collaboration with Grammar Solar.

With the building model for air collector systems you are able to recognize the connections between building parts and system technology, and simulate the building dynamics and ventilation losses. The building capacity is calculated from the data on the building geometry, insulation and construction.

Climate Data

The integrated MeteoSyn tool offers:

  • Climate data records for approx. 8,000 weather stations worldwide
  • New climate data from DWD (German weather service) for Germany for the period 1981-2010
  • Creation of new climate data from own monthly average values
  • Interpolation of climate data for many more user-defined locations

T*SOL® delivers a range of results tables and diagrams. The project report presents the following results:

  • Irradiation, energy balance
  • Fuel savings, avoided CO2 emissions
  • System efficiency
  • Solar fractions: domestic hot water, heating, total

You are also provided with a detailed project report.

Feature Matrix
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Frequently Asked Questions: Heat Pumps

Solar Thermal

Solar Thermal

In T*SOL you can select from a number of systems, including company systems. Systems with and without space heating are available. Furthermore you can simulate swimming pool and large-scale systems. It is not possible to create user-defined systems in addition to the systems included in T*SOL.

Solar Thermal

Please open the collector database by choosing "Database- "Components" - "Collectors". Select any collector as a template and click on the "Edit CollectorbuttonAfter creating a copy, you can now edit thecollector data and "Save" your changes.

Solar Thermal

For systems with hot water and heating support (except swimming pool systems) the solar fractions for DHW and heating are only shown separately in the project report or detailed project report if a division in energy values for DHW and heating is possible. As soon as secondary circulation is included in the system, this is only still the case for System A5.2. In addition to the value for the total solar fraction, the solar fractions for DHW and heating can be included in the results for the following T*SOL systems: A3, A3.1, A3.2, A4, A4.1, A5 and A5.2. Separate solar fraction values cannot be shown for the following systems: A5 with circulation, A5.4, A5.5, A6, A12, company-specific combination systems, Buderus SAT systems, Paradigma systems and C4. If separate values are not possible, only the total solar fraction will be shown.

Solar Thermal

These systems are no longer required because it is now possible to have either one or two collector arrays with systems A1.x, A2.x, A5.x, A 10, A 12 and A 16. Please open the variant dialog by using "System Definition" - "Variant" (in T*SOL Expert and T*SOL Pro 4.5 "Parameters " - "Variant"). Click on the “Components” tab and select the “Two Collector Loops” option.

Solar Thermal

Yes, this is possible for the systems A1.x, A2.x, A5.x, A 10, A 12 and A 16. Please open the variant dialog by using "System Definition" - "Variant" (in T*SOL Expert and T*SOL Pro 4.5 "Parameters " - "Variant"). Click on the “Components” tab and select the “Two Collector Loops” option. You can now size both collector loops separately.

Solar Thermal

The fuel saving is the energetic saving divided by the fuel heating value Hi (lower heating value) or Hs (higher heating value), depending on which of these values has been set for the boiler (auxiliary heating) efficiency. The energetic saving is not the same as the amount of energy transferred to the system (e.g. to the storage tank), but is calculated for each step of the simulation from solar energy in relation to the boiler efficiency. (NB: If the solar system would not be present, the boiler would have to deliver the calculated amount of solar energy at the corresponding efficiency.) The boiler efficiency values are given in the boiler dialog. If you carry out a calculation without space heating the software uses the efficiency for domestic hot water supply.
The help facility in the programme has the following definition for fuel savings: The available solar energy is converted, using the respective auxiliary heating efficiency, to give the corresponding primary energy equivalent.

Solar Thermal

The Microsoft .Net Framework is missing. At least version 2.0 Service Pack 1 is required to use T*SOL Pro 5.0. You can use the Windows update function to install the latest .Net Framework version for your Windows. During the update procedure you have to select it in the optional updates section. Alternatively, you can use the following link to download the Microsoft .Net Framework 2.0 SP1 and then install it:


Solar Thermal

It could be that the program has a problem to read the TSOL Pro.ini or TSOL Expert.ini file properly.

Please try the following steps:

1. Close the program

2. Depending on your operating system you will find the TSOL Pro.ini or TSOL Expert.ini in the following folder:

- Windows XP: C:\documents and settings\<USER>\personal folder\Valentin EnergieSoftware\TSOL...

- Windows Vista / Windows 7: C:\Users\<USER>\Documents\Valentin EnergieSoftware\TSOL...

3.     Delete the TSOL Pro.ini or TSOL Expert.ini and restart the program. It initializes new and creates a new *.ini file.

Solar Thermal

There could be 2 reasons for that:

  1. The Microsoft .Net Framework is missing. At least version 2.0 Service Pack 1 is required to use T*SOL Pro 5.0. You can use the Windows update function to install the latest .Net Framework version for your Windows. During the update procedure you have to select it in the optional updates section.
  2. With some Windows-System occurs a problem with old Microsoft SQL Server Compact 3.5 installations. Microsoft is offering a patch for that problem: http://www.microsoft.com/download/en/details.aspx?id=5783

The download contains of 2 files; one for 32bit and one for 64bit. If you were using a 64bit system you have to install both files.

The installation order is important:

  • At first: SSCERuntime_x86-ENU.msi (32bit)
  • And then: SSCERuntime_x64-ENU.msi (64b)
Solar Thermal

Please create a PDF file with the export function and print it out afterwards.


  • T*SOL - What planners want

    Summary of main features - Separate output of solar fractions for space heating and domestic hot water, Photo Plan, comprehensive profitability calculation

Program Screenshots