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EBSILON® Libraries 

EBSILON® Libraries – Key to the analysis of combined heat and power plants
The ENEXSA Libraries work exclusively in conjunction with the EBSILON®Professional heat balance software by STEAG Energy Services GmbH, Essen/Germany.

The performance characteristics of a gas turbine or a reciprocating engine can be integrated into a detailed plant model using specific model components. The user can perform in-depth thermodynamic analysis of the overall plant benefiting from the features of EBSILON®Professional, such as

  • individual equipment characteristics in design and off-design mode
  • flexibility in equipment arrangement, plant configuration and mix of technologies
  • a powerful, fast and reliable equation-based solver
  • open architecture to include user-defined models for new technology or vendor data
  • a state-of-the-art graphical user interface and a wide variety of output options in graphical and tabular forms and
  • an interface to Microsoft® Office Excel®.

ENEXSA continuously works with vendors of gas turbines and reciprocating engines in order to enlarge the ENEXSA Libraries and to create a valuable and 'living' source for the performance information of this equipment, so that engineers around the globe can use reliable and first-hand data to analyse and improve combined cycle and industrial cogeneration plants.


If you want to learn more about EBSILON®Professional, please contact us.

Ebsilon-Bibliothek
Dr. Josef Petek
+43 (316) 400 9800
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ENEXSA Gas Turbine Library


The ENEXSA Gas Turbine Library is designed for the use within the EBSILON®Professional Component 106 "Gas Turbine (OEM GT)". The ENEXSA Gas Turbine Library covers the full range of industrial applications, from micro gas turbines to large H-class gas turbines. The performance data are supplied and approved by the respective OEM. Data updates are generated as soon as new models and/or performance updates become available.
The performance characteristics of the gas turbine have a large impact on the subsequent HRSG and its steam cycle. Modern high-efficiency gas turbines also integrate with the water-steam cycle for fuel and/or air pre-heating, and in some cases the waste heat from the GT combustor and turbine are re-covered in the HRSG. The EBSILON model of the overall plant enables the user to evaluate these processes over the entire operating range of the plant based on the detailed off-design performance data supplied in the ENEXSA Gas Turbine Library.
The Gas Turbine Library provides correction factors and offsets for power, heat rate, exhaust flow, exhaust temperature. cooling duty and injection flow in correlation to ambient conditions as well as part load operation. Up to 53 correction curves can be included in one data set for a specific GT model. The data are stored in tables that can be accessed in a matrix of correction curves. The user can use the pre-configured and vendor approved curve sets provided by ENEXSA. It is also possible to create a new data set based on project-specific information from scratch or by copying and editing existing data sets.
Depending on the nature of the performance correlation, the correction Curves are one- or two-dimensional. Each Correction Curve can be displayed separately, and individual values of the secondary parameter can be selected or de-selected. The example shown here is a typical curve for heat rate vs. part load fraction, with ambient temperature as the secondary parameter.

ENEXSA Reciprocating Engine Library


The ENEXSA Reciprocating Engine Library is designed for the use within EBSILON®Professional Component 153 (Reciprocating Engine). This component is designed to represent large gas or diesel engines with heat integration. The performance data are supplied and approved by the respective OEM.
The combination of thermal performance data and detailed information about the control schemes for temperature and flow of the different cooling cycles within the gas engine is important for the simulation of a modern highly-integrated CHP plant. It is possible to calculate the load-dependent amount of available waste heat from the engine, which can be optimally utilized in the connected systems. This approach allows the user to produce an exact digital twin of the plant which is valid over the entire operating range.
In order to reach maximum fuel efficiency, modern engine-based CHP plants aim at maximum integration of the waste heat available from the engine. To describe the heat available from the engine, up to six heat sources can be defined, and the utilization of this heat is controlled in four different heat rejection groups. Multiple options for control schemes for flow and temperature of the different cooling cycles allow for accurate representation of the energy released from the engine, not only in terms of duty, but also in terms of flow and temperature. The latter is important for the correct simulation of the heat utilization, since these parameters may become limiting under specific operating conditions.
The ENEXSA Reciprocating Engine Library data sets describe power, heat consumption, exhaust temperature, exhaust flow and various heat sources (HT, LT, Oil) with respective shift of heat as a function of temperature and load. The correlations are given as two-dimensional matrices. The sample screen shot shows the correlation of exhaust temperature and engine load fraction with inlet temperature as the secondary parameter.

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16. bis 19. September - OSIsoft PI World

ENEXSA goes Gothenburg, meet us at OSIsoft PI World!
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ENEXSA Reciprocating Engine Library: New Release for all "Library Users"

New Release, several data updates, new gas engine types, additional 60Hz gas ...
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