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Symulacja pracy lokalnych źródeł ciepła w budynkach

Klimczak M., Ziembicki P.

Ciepłownictwo, Ogrzewnictwo, Wentylacja

2013

T. 44, nr 4

144-147

W artykule przedstawiono fragment przeprowadzonych prac badawczych realizowanych w ramach jednej z części projektu badawczego finansowanego przez NCBiR. Przedstawiono i krótko scharakteryzowano oprogramowanie symulacyjne Polysun, opisano stworzone modele symulacyjne układów technologicznych źródeł ciepła oraz wskazano przyjęte założenia wejściowe symulacji. W końcowej części scharakteryzowano otrzymane wyniki oraz na ich podstawie przeanalizowano przydatność wygenerowanych profili zużycia energii do dalszych badań, a także wyciągnięto wnioski dotyczące zaimplementowanych funkcjonalności oprogramowania Polysun.

A part of a research work financed by the National Centre for Research and Development (NCRD) project is presented. The simulation program Polysun is given and briefly characterised. Actually developed simulation models of technological systems of heat sources are described including input assumptions. Final part contains the characterisation of the results obtained. On their basis, the usefulness of further study of generated energy consumption profiles has been analysed. The conclusions concerning the functionality of implemented Polysun program are included

Numerical modelling of a multi-physical problem within an encapsulated three-phase transformer and its surroundings

Smolka J., Nowak A. J., Ingham D.B., Elliot L.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2006

Vol. 10, No 1

63-81

The paper presents a numerical thermal model of an encapsulated three-phase electrical transformer. The model is based on the multi-physical approach and involves heat transfer analysis coupled with the examination of specific power losses in the coils and the core using electromagnetic field analysis as well as determination of thermal stresses. The thermal boundary conditions (i. e. local heat fluxes) are determined by considering a numerical model of the surrounding air. Additionally, the device is cooled via radiation (from the external walls) and forced convection (a water cooling system). A few different configurations of the cooler and the heat pipes are also analyzed. Moreover, anisotropic material properties were applied for stranded coils and the core. A partial experimental validation of the model has shown that the temperature distribution within the transformer is more realistic and closer to the measurements when compared with the previous analysis limited to heat transfer problems only with uniform internal heat sources and isotropic material properties. The total heat transfer rate indicates that forced convection is the most important heat dissipation mechanism in this model. The significance of the water cooling system has also been established in calculations of crack presence in the model.