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T*SOL basic

Simulation Program for Quick Design and Yield Calculation of Solar Thermal Systems


Would you like to plan a solar thermal system simply and reliably? If so, we recommend T*SOL® basic.

T*SOL® basic offers accurate calculations and extremely convenient planning. The simulation program is especially for residential systems, supportiing technicians and solar system installers with their project planning. The program structure gives you maximum flexibility in all respects. T*SOL® basic offers 20 types of systems for hot water supply and space heating, plus nine types of outdoor pool systems for the simulation of solar swimming pool heating.

Get your solar thermal energy project moving with T*SOL® basic!

System Requirements

T*SOL basic englisch

  • Internet Access
  • Processor: 1,5 GHz Pentium PC
  • Memory: 512 MB
  • Hard Disk Drive: 700 MB
  • Monitor Resolution: at least 1.024 x 768 pixel
  • Operating System: Windows XP (Service Pack 3), Windows Vista, Windows 7
  • Graphics: 64 MB, OpenGL – Support (Photo Plan)
  • Other: Microsoft .Net Framework 3.5 (Service Pack 1)

Program Details


Thanks to an intuitive interface, a solar thermal system can be designed particularly easily and quickly with T*SOL basic. Clear and comprehensible dialogs guide you through the separate menu items. You can work through the program simply and in only a few steps. It couldn’t be easier.


Systems Selection in T*SOL basic

T*SOL basic offers you 20 pre-configured systems. covering the majority of commercial systems in the residential sector. System selection can be made from the icons or a list. Narrowing the selection to the individual manufacturers is also possible. Another convenient feature is the favorites list where you can save your most frequently used systems.

Design Assistance

T*SOL basic guarantees maximum planning certainty and of course assists you with your solar system design. The design assistance is built into the parameter dialogs. You can activate the dialogs by clicking on the respective system components. The program calculates the collector area and the storage tank volume for a solar thermal system. The required collectors are determined on the basis of the hot water and heating requirement and the number of people in the household. A representative selection of hot water consumption profiles is included in the program.

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 solar thermal system 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 solar thermal system, according to your customer’s wishes. Photo Plan is therefore a great tool to help home owners make the right decision!

Climate Data

T*SOL® basic includes extensive climate data for at least 450 locations in Germany and a further 8,000 worldwide. The climate data includes information on irradiation, air temperature and wind speed in hourly resolution for the period of a year.


T*SOL® basic provides your customers with a summary of results and a clear, exportable project report. The report presents all the results for the yield forecast and collector, as well as a system overview. It can be printed out and/or sent as a PDF file by e-mail.

Overview of main features
  • Annual simulation of solar thermal systems for domestic hot water heating, space heating and swimming pool heating
  • Design assistance for the optimization of preconfigured collectors, storage tanks and boilers
  • Visualization of the collectors on the customer’s roof with Photo Plan
  • Extensive component databases
  • Shading by the horizon can be considered
  • Domestic hot water consumption profiles included in calculations
  • Both radiator and underfloor heating possible
  • Balancing of energy, pollutant emissions and costs
  • Calculation of standard evaluation parameters such as system efficiency, solar fraction etc.
  • Detailed presentation of results in reports
  • Financial analysis of a system after annual simulation
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. Further systems are included in the additional program modules for swimming pool, large-scale systems and district heating (only available in T*SOL Expert). It is not possible to create user-defined systems in addition to the systems included in T*SOL.

Solar Thermal

First you need to open the dialog for the right collector type in the menu "Database" - "Components" - "Collectors". In the dialog, click on “Select” and choose a collector to use as a basis to create a new collector. Enter all of the data required, as per the datasheet or test report, overwriting the existing data. Make sure that you enter a new reference for the collector type, so that you can distinguish it from other collectors, and then save your entries with a click on “Save”.
You have now added a new collector to the T*SOL database. You can amend your entries as follows: select the collector to be changed – overwrite the data – save changes with a click on “Save”.

As of version T*SOL 5.0 you open the collector database by choosing "Database" - "Components" - "Collectors". Select any collector as a template and click on the "Edit Collector" button. After creating a copy, you can now edit the collector data and "Save" your changes.

Solar Thermal

It might be due to the model change in respect of the calculation of heat gains, particularly for the irradiation onto the window areas facing north. In T*SOL 4.5 the percentage of diffuse solar radiation onto the north side is taken into account more strongly. This means that changes in the heat requirement occur and therefore also in the results.

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)

Program Screenshots