Influence of Can Flatness on Heat Dissipation of Aluminium Electrolytic Capacitor

The lifetime of aluminium electrolytic capacitors highly depends on their core temperature. Heat dissipation in general applications happens by the extended cathode, which is in contact with the inner side of the can. In the case of heat sink applications, the most important heat transfer phenomenon is the heat conduction through the bottom of the aluminium can. The quantity of the dissipated heat is in direct proportion to the size of the heat transfer surface. The more dissipated heat may increase the lifetime of the capacitor. Therefore, the flatness value of the can bottom is critical. This paper presents a flatness measurement method, which can successfully replace the equipment for a more complex and more expensive 3D measurement. It discusses an implementation of a measurement environment, where data acquisition and visualization are automated by a LabVIEW-based software. In addition, this study deals briefly with the influence of production processes on the flatness value of the capacitor produced by leading manufacturers

Nyílászárók szerkezeti elemeinek hatása a teljesítményjellemzőkre I. rész. A rugalmas ütközések hatása az ablak légzárására

The windows and doors structures and their performance characteristics prescribed by European directives and determined by the new product standards play an important role in the energy balance of buildings. Between the performance features we find the air tightness of windows, which limit value required by a certain usage must be assured in the moment of installation. This research intends to investigate the influence of structural elements on windows and doors performance. The present article describes the role and effect of sealing’s on windows air tightness. A series of laboratory experiments were performed examining the influence of primary and secondary weather-strips as well as the effect of sealing’s weathering on elasticity. By removing the primary weather-strip the air tightness declined significantly at each pressure level. Opposite to this the secondary weather-strip elimination doesn’t affected considerably the air tightness at certain pressure levels. The impact of primary sealing weathering varied among the examined window types