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Absorption chiller modelling with TRNSYS - requirements and adaption to the machine EAW Wegracal SE 15

: Witte, K.; Albers, J.; Krause, M.; Safarik, M.; Besana, F.; Sparber, W.

International Solar Energy Society -ISES-, Europe; International Energy Agency, Solar Heating & Cooling Programme -IEA-SHC-, Cedar/Mich.; Sociedade Portuguesa De Energia Solar -SPES-:
EuroSun 2008, 1st International Conference on Solar Heating, Cooling and Buildings : Lisbon, Portugal, 7 - 10 October 2008
Red Hook, NY: Curran, 2008
ISBN: 978-1-61782-228-5
EuroSun Conference <7, 2008, Lisbon>
International Conference on Solar Heating, Cooling and Buildings <1, 2008, Lisbon>
Conference Paper
Fraunhofer IBP ()

In order to propagate the installation of solar cooling systems dimensioning and system design have to be optimised. Although the transient simulation software TRNSYS is well established for this purpose, considerable deviations to measured values are possible, when components are not correctly used or designed for the simulation. For this work two different models (so called Types) are investigated in parallel to simulate the part load behaviour of the absorption chiller EAW Wegracal SE 15. The paper reports on the possibilities and application limits for both TRNSYS Types. Their differences in accuracy regarding laboratory test data as well as real time data of a solar cooling system are discussed. The basic methodology as well as the applied modifications to adapt the TRNSYS-Types to the EAW chiller are described. Finally the necessity to improve both models for non-nominal flow rates is shown.