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24.10.2016

Release Modelica Library ClaRa 1.1.2

XRG Simulation is proud to announce the updated version of the Modelica library ClaRa for power plant simulations. This very successful library for the simulation of Clausius-Rankine cycles is improved and enhanced in the research collaboration "Compound DYNSTART: Start-Up and Transient Behaviour of Power Plants". XRG closely cooperates with TLK-Thermo GmbH, ESI ITI GmbH, the Hamburg University of Technology and companies from the power plant industry. The latest release provides backward compatible enhancements, like the update of the FluidDissipation 1.1.8 and bugfixes for more than 170 users worldwise. It can be applied without any conversion efforts also for existing application models. The work is supported by the Federal Ministery of Economics Affairs and Energy (number 03ET7060D) and started in August 2015 and will end in December 2018.


The release is free of charge and can be downloaded under
www.claralib.com. More information about the research project DYNSTART can be found here.

16.09.2016

Web-based Modelica-Simulation of Coaxial Geothermal Heat Exchangers

geoKOAX Logo

In cooperation with geoKOAX GmbH, ROM Technik Ltd. & Co. KG, Hamburg University of Technology, Silpion IT-Solutions and XRG Simulation GmbH the Modelica-based simulation tool geoSIM was successfully launched today. The tool is used for the design and selection of coaxial borehole heat exchangers fields and was validated against measurement data of real life applications.

Due to the innovative installation on a webserver https://simulation.geokoax.de/ the tool is available for any user – even under usage of smart phones or tablets. The simulation just requires internet access and an internet browser. After a short computation time of a few seconds an automatic report incl. graphs and tables is made available to the user by a link.

Together with our partners, we are very proud to announce the successful launch of geoSIM!

08.09.2016

New Release of FREE Modelica library FluidDissipation 1.1.8

FluidDissipation Library

FluidDissipation is a free and open Modelica Library for calculations of pressure differences and heat transfer. It is developed by XRG Simulation.

A new two-phase pressure loss model (Mueller-Steinhagen Heck) is added to the FluidDissipation. The new model is invertible and by formulation linearized around zero mass flow. Thus, the numerical performance, especially of zero- and backflow calculations, is superior to other two phase pressure loss models. Furthermore, it was developed with a large data base of measurements and gives therefore reliable results within the model's scope.


The library is open source and can be downloaded in the version 1.1.8 for Dymola and MSL 3.2.2. Many functions are also compatible with OpenModelica.

List of revisions:

New features:

  • Added new function for pressure loss of two-phase flows in straight pipes (dp_twoPhaseOverall_DP)
  • Added application for dp_twoPhaseOverall_DP: FluidDissipation.Examples.TestCases.PressureLoss.StraightTwoPhasePipe

Corrected bugs:

  • Removed failure in kc_twoPhaseOverall_KC
  • Corrected failure status for StraightPipe.kc_overall
  • Removed superfluous calculations in StraightPipe.dp_twoPhaseOverall_DP
  • Removed obsolete annotations and corrected many typos
  • Removed many singularities in heat transfer functions for Reynolds Number at zero velocity
  • Corrected failure in SmoothPower_der
  • Corrected factor K_st1 in dp_TJoin
  • Corrected functions kc_twoPhase_boilingHorizontal and kc_twoPhase_boilingVertical

Changes with conversion:

  • Deleted model StateForHeatTransfer_TwoPhase which is now replaced by StateForHeatTransfer

Not backwards compatible changes:

  • Removed superfluous parameter "target" in TwoPhaseFlowHT_IN_var record. The following error will be raised by Dymola: "Modelica Unknown named argument 'target' for function FluidDissipation.HeatTransfer.StraightPipe.kc_twoPhaseOverall_KC_IN_var in MODELNAME. Please remove potential inputs for argument "target" in function calls manually
  • Removed superfluous input "d_hyd" from function ReynoldsNumber

 

30.08.2016

Release Modelica Library ClaRa 1.1.1

XRG Simulation is proud to announce the updated version of the Modelica library ClaRa for power plant simulations. This very successful library for the simulation of Clausius-Rankine cycles is improved and enhanced in the research collaboration "Compound DYNSTART: Start-Up and Transient Behaviour of Power Plants". XRG closely cooperates with TLK-Thermo GmbH, ESI ITI GmbH, the Hamburg University of Technology and companies from the power plant industry. The latest release provides backward compatible enhancements and bugfixes for more than 170 users worldwise. It can be applied without any conversion efforts also for existing application models. The work is supported by the Federal Ministery of Economics Affairs and Energy (number 03ET7060D) and started in August 2015 and will end in December 2018.


The release is free of charge and can be downloaded under
www.claralib.com. More information about the research project DYNSTART can be found here.

27.07.2016

XRG is rewarded the cachet 2016/2017 "Innovative through Research"

XRG is again rewarded the cachet "Innovative through Research" by Stifterverband for German Science.

The cachet appreciates dedication for research and development, thus XRG´s competences in research and its innovation skills. Since not even one percent of Germany´s 3.5 million companies research, we are part of an important group.
The Stifterverband which is committed to junior academic staff, excellent universities and top level research is Germany´s main non-corporate business development agency.

In collaboration with renowned research institutions and companies XRG continues to take part in challenging research projects for energy technology in the automotive, process and building services field, for the aerospace and shipping industry and for power plants and constantly creates new innovative products and procedures. Thus, the achieved results are not only available for XRG but also for our customers, in some cases they are even for free (see FluidDissipation Library , MoMoLib as well as ClaRa).

Our current research projects are:

Dynstart - Start-up and Transient Behavior of Power Plants

The research project "Compound DYNSTART: Start-Up and Transient Behaviour of Power Plants" will investigate the capabilities of power plants with and without CCS technologies to provide residual loads in future energy markets.

Nakulek - Natural circulation cooling for power electronics

By means of 1D and 3D simulation models a components of a demonstrator system for the cooling of onboard power electronics are developed

TOICA - Thermal Overall Integrated Concept Aircraft
The European TOICA project intends to radically improve the way thermal studies are performed within aircraft design processes. Its goal is to create a platform for collaborative modeling and simulation of the thermal behavior of aircraft airframe systems, equipment and components.

CoHeReNT - Control of Heat Recovery Networks
The aim is to develop a development platform that allows the engineer to efficiently estimate the temporal propagation of a malfunction within the production system in the first stage. Furthermore in the second stage the platform is to allow an estimation of the cost that would be necessary to reduce the propagation of the malfunction to a minimum, thus ensure a stable process control.

 

Our completed research projects are:

MoMoLib - Modelling Fluid Properties for R134a and Humid Air
XRG Simulation will develop in this Clean Sky joint research project two media models Tetrafluoroethane (R134a) and Moist Air (from -100°C to +250°C).

DynCap - Dynamic Capture of CO2
The research project “Dynamic investigation of Clausius-Rankine processes with CO2 capture for supply of operating reserve” will evaluate the processes for capture and storage of CO2. The focus of the study is the transient behaviour of the plant and the question: How can plants with CO2 capture contribute to the supply of operating reserve? The Modelica library ClaRaCCS will be created during the research project. ClaRaCCS stands for Clausius-Rankine with Carbon Capture and Storage.

SyntHex
The innovative simulation tool for smart heat exchanger networks

OpenProd
Open model-driven whole-product development and simulation environment

Mohicab
Modelica library to simulate coupled heat and mass transfer in aircraft insulation

EuroSysLib-D
Modelica library for calculation of pressure loss and heat transfer and Modelica library for calculation of the thermal comfort and energetic simulation of rooms and cabins