Harvesting electrical energy from rain by SPMS - Special pipe and micro-generator system
This paper presents a methodology to find optimal height for pipe of special pipe and micro generator system - SPMS for harvesting electrical energy from potential energy of precipitations in form of rain. Theoretical calculations in order to obtain theoretical amount of energy for two-storey house in western slope of Vidzeme upland of Latvia are presented as well as calculations to obtain real amount of obtainable energy based on experimental data are presented. Virtual model of SPMS developed according experimental data in simulation program Lab VIEW 7.1 is described.
Harvesting raindrop energy: experimental study
At present, the energy autonomy of a microsystem is limited by the lifespan of the battery. Hence the development of the energy harvesting concept, whereby the energy needed to power the sensor is taken from the operating environment. However, there is no single solution suitable for all types of environment. In this paper, we look at a still unexploited source of energy: rain. Our system scavenges the vibration energy from a piezoelectric flexible structure impacted by a water drop. We present an experimental device that validates the aforementioned theoretical results.
Développement et étude d'un viscosimètre absolu à chute de bille
L'augmentation de l'incertitude tout au long de l'echelle de viscosite etant le principal inconvenient de la viscosimetrie capillaire, un viscosimetre absolu a chute de bille a ete developpe, qui permet de couvrir une large gamme de viscosite tout en gardant une faible incertitude. La mesure de viscosite repose alors sur la mesure de la vitesse limite de chute de la bille. Un banc experimental a ete developpe afin d'atteindre une incertitude relative de l'ordre de 10-3. Il permet d'observer la trajectoire de la bille a l'interieur d'un tube cylindrique rempli du liquide etudie et d'obtenir l'evolution de la vitesse. La caracterisation metrologique de ce banc experimental est presentee en utilisant tout d'abord la loi de propagation des incertitudes et ensuite la simulation numerique de Monte-Carlo. Enfin, les mesures de viscosite et les incertitudes obtenues avec le viscosimetre a chute de bille sont confrontees a celles obtenues avec un viscosimetre capillaire.