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  • http://www.valentin-software.com/sites/default/files/downloads/produktflyer-und-broschueren/en/comparison-solar-thermal-programs.pdf http://www.valentin-software.com/en/downloads/produktflyer-und-broschueren/program-comparison-solar-thermal
  • http://www.valentin-software.com/sites/default/files/downloads/bestellscheine/en/order-form-updates-thermie.pdf http://www.valentin-software.com/en/downloads/bestellscheine/order-form-updates-solar-thermal
  • http://www.valentin-software.com/sites/default/files/downloads/handbuecher/en/tsol-4-5-manual.pdf http://www.valentin-software.com/en/downloads/handbuecher/manual-tsol-expert-4-5

T*SOL Expert

Dynamic Simulation Program for Detailed Analysis of Solar Thermal Systems and their Components


You require precise data on the physical changes in state of a solar system?
Then T*SOL® Expert is the simulation program of choice.
The program supports researchers, scholars, industry planners, developers, and surveyors in optimizing the components and units of a solar system. It offers all the capabilities of T*SOL® Pro and additionally includes further advanced features. In addition to parameter variation and the energy balance, T*SOL® Expert can be used, for example, to carry out monitoring with real measurement data.


System Requirements

T*SOL Expert 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 2000, XP, Vista, Windows 7
  • Graphics: 64MB

Program Details

Parameter Variation

Automatic parameter variation can be carried out with T*SOL® Expert. The simulation calculates the influence of the parameters on a target value. These include the solar fraction, efficiency, and external energy requirements. In this way, the separate parameters of a component (e.g. the sensor height in a tank) can be optimized for the various operating modes of a solar system.


T*SOL® Expert simulates solar systems with the real measurement values of the input variables and can compare the result with the actual system yield. By using data import, you can edit, evaluate, and convert the measurement data to the T*SOL format.

Energy balance

All the energy flows in the system are calculated, output to a table, and presented as a flow chart (Senkey diagram). You can select a detailed display of the losses of individual system components.

Climate Data

The integrated MeteoSyn tool provides you with climate data records from 8,000 weather stations around the world and can interpolate climate data for any location from them.

Additional Modules

As with T*SOL Pro, an open-air or indoor swimming pool can be incorporated in the solar cycle. The swimming pool module contains eleven different systems.

The use of large solar buffer tanks, external heat exchangers, and anti-Legionnaire's switches is possible with the large-scale systems module.

A solar local district heating module is also available, and can be used to simulate and design local district heating systems supported by solar power with nine variable systems. This tool was developed together with ZfS-Rationelle Energietechnik GmbH on the Solarthermie 2000plus program. It enables you to display the key system variants with regard to the network structure, the consumption system in adjoining buildings, and the integration of the solar system in the local district heating network.


All state variables of a system can be calculated during the simulation. These results can be displayed in one-minute resolution.
T*SOL® Expert thus offers you an extremely accurate basis for optimizing individual components and systems for planning, designing, and monitoring ideal solar systems.

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)
  • System planning and evaluation with a solar local district heating network as an example

Program Screenshots