Autor: Herbst, O. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Impact Resistance of Guards on Grinding Machines
Autorzy:: Mewes, D.
Mewes, O.
Herbst, P.
Powiązania:: https://bibliotekanauki.pl/articles/90708.pdf
Data publikacji:: 2011
Wydawca:: Centralny Instytut Ochrony Pracy
Tematy:: guards
stationary grinding machines
impact tests
cylindrical projectiles
grinding wheel ceramics
Opis:: Guards on machine tools are meant to protect persons from injuries caused by parts ejected with high kinetic energy from the machine’s working zone. With respect to stationary grinding machines, Standard No. EN 13218:2002, therefore, specifies minimum wall thicknesses for guards. These values are mainly based on estimations and experience instead of systematic experimental investigations. This paper shows to what extent simple impact tests with standardizable projectiles can be used as basis for the evaluation of the impact resistance of guards, provided that not only the kinetic energy of the projectiles used but also, among others, their geometry corresponds to the abrasive product fragments to be expected.
Źródło:: International Journal of Occupational Safety and Ergonomics; 2011, 17, 4; 411-421
1080-3548
Pojawia się w:: International Journal of Occupational Safety and Ergonomics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Modeling of KERENA emergency condenser
Autorzy:: Bryk, R.
Schmidt, H.
Mull, T.
Wagner, T.
Ganzmann, I.
Herbst, O.
Powiązania:: https://bibliotekanauki.pl/articles/240358.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: condensation
Kerena
emergency condenser
Modelica
OpenModelica
kondensacja
kondensator awaryjny
Opis:: KERENA is an innovative boiling water reactor concept equipped with several passive safety systems. For the experimental verification of performance of the systems and for codes validation, the Integral Test Stand Karlstein (INKA) was built in Karlstein, Germany. The emergency condenser (EC) system transfers heat from the reactor pressure vessel (RPV) to the core flooding pool in case of water level decrease in the RPV. EC is composed of a large number of slightly inclined tubes. During accident conditions, steam enters into the tubes and condenses due to the contact of the tubes with cold water at the secondary side. The condensed water flows then back to the RPV due to gravity. In this paper two approaches for modeling of condensation in slightly inclined tubes are compared and verified against experiments. The first approach is based on the ﬂow regime map. Depending on the regime, heat transfer coefficient is calculated according to specific semi-empirical correlation. The second approach uses a general, fully-empirical correlation. The models are developed with utilization of the object-oriented Modelica language and the open-source OpenModelica environment. The results are compared with data obtained during a large scale integral test, simulating loss of coolant accident performed at Integral Test Stand Karlstein (INKA). The comparison shows a good agreement. Due to the modularity of models, both of them may be used in the future in systems incorporating condensation in horizontal or slightly inclined tubes. Depending on his preferences, the modeller may choose one-equation based approach or more sophisticated model composed of several exchangeable semi-empirical correlations.
Źródło:: Archives of Thermodynamics; 2017, 38, 4; 29--51
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki