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2020 IEEE 8th Electronics System-Integration Technology Conference (ESTC), 15.-18. 9. 2020
No full textTwo in-situ failure detection methods by measuring acoustic emissions and transducer responses are presented to investigate the wire bond degradation failure during a highly accelerated mechanical fatigue test. This BAMFIT fatigue test is used to induce cyclic shear stresses in the bond interface until wire bond lift-off, operating at 60 kHz. The task was to incorporate non-invasive failure detection to identify the degree of degradation prior to end of life as an extension to the BAMFIT method and a possible quality control method. The acoustic emission investigations uses a Fabry Perot interferometer to detect high frequency emissions in the vicinity of the wire bond and detecting changes in the first three harmonics to identify a bond degradation. The transducer response approach observes systematic changes in the vibration and the damping behavior of the coupled resonance system by using the transducer as a piezo sensor. The results have shown that defective bond interconnect can be identified as early as ~50% of end of life, using high power but very short vibration pulses, and at ~80% for low power and completely non-invasive pulses. The obtained responses from the presented methods were correlated to the degree of degradation of the bond wire interface, by completing BAMFIT tests until end of life, cross section analysis as well as non-destructive X-ray computer tomography.Energie-Umweltmanagemen
Market development and consequences on end-of-life management of photovoltaic implementation in Europe
No full textEnergie-Umweltmanagemen
Complex glass facade modelling for Model Predictive Control of thermal loads: impact of the solar load identification on the state-space model accuracy
No full textScience.Research.Pannonia. 22Above and beyond improving the efficiency of the building envelope and the energy supply
system, the demand-side flexibility in terms of load shifting and peak reduction are vital factors in further
increasing the share of volatile renewable energy sources. The thermal activation of building components,
like floors and ceilings, enables the cost-effective potential for short-term energy storage to fulfil these
requirements. In order to exploit the storage capabilities of active building systems, a reliable model predicted
control (MPC) approach is required. However, primarily if a large glass façade element is utilised,
the appropriate modelling of solar loads is critical for an effective MPC operation. Hence, based on a
dynamic building simulation tool, a characteristic map for the solar load prediction of a glass façade
system in combination of external venetian blinds was generated to enhance the state-space model approach
for the MPC algorithm. The comparison with a conventional state-space model approach shows
the integration of a detailed characteristic map can only marginally improve the prediction accuracy.
The additional information required from the glass façade manufacturer and the associated simulation
effort is not of substantial value. In contrast, the conventional grey box model enables an entirely datadriven
parameter identification, without the manufacturers’ data. Furthermore, the MPC optimisation
procedure, searching for the best control strategy, can be more efficient (solver-based optimisation), with
shorter computing turnaround times.Energie-Umweltmanagementhttps://creativecommons.org/licenses/by-nc-nd/4.0
Optimierung von Smart Home Energy Management Systemen mit Usability-Tests
No full textScience.Research.Pannonia. 22Forschung BurgenlandWirtschaf
Assuring Academic Honesty in e-Assessments
No full texthttps://www.fnma.at/publikationen/magazinGesundhei
Die Einführung der Kindergrundsicherung in Österreich - ein Modell der Volkshilfe
No full textSoziale
System efficiency of pvt collector-driven heat pumps
No full textThe use of standard heat pump (HP) systems offers an efficient option to replace conventional heating systems (e.g. oil and gas boilers) for space heating and domestic hot water. Due to the higher noise emissions and the lower overall energy efficiency of air-to-water heat pumps, the use of ground-coupled heat pump systems is increasingly in demand. The cost-efficient dimensioning of horizontal ground heat exchanger (HGHE) systems, considering possible solar waste heat potentials to improve regeneration behaviour, is particularly challenging. The reason for this is the complex system and control engineering optimisation possibilities resulting from the dynamic heat transport behaviour of the horizontal ground heat exchanger. Essential influencing variables such as the water content of the soil due to the groundwater level, rainwater infiltration and surface evaporation can only be described with massive effort using the model equations of the unsaturated zones. However, these variables are necessary to obtain a better fundamental understanding of the usable storage potential of solar-coupled systems and to be able to derive targeted optimisations at the system level. Therefore, the waste heat utilisation potential of PVT collectors for the regeneration of heat pump coupled horizontal ground heat exchanger systems are analysed employing simulations. For this purpose, a PVT-collector model and a HGHE model based on a single-family were developed and validated by experimental investigations. Based on this, a system simulation model consisting of the components PVT-collector, heat pump, heat delivery system, HGHE and the corresponding control units were built using TRNSYS. With the help of the simulation model, parameter studies were carried out, and the main factors influencing the overall energy efficiency (COP) of the system and the seasonal performance factors (SPF) were identified. Furthermore, the solar waste heat utilisation potential of the PVT collectors was analysed to increase the efficiency of the heat pump system.Energie-Umweltmanagemen
CIPS 2020 11th International Conference on Integrated Power Electronics Systems, March, 24-26, 2020, Berlin
No full textIn the present work, the influence of loop forming aspects on the reliability of US-bonded aluminium heavy wires was studied, combining three measurement techniques, for the first time: Laser confocal microscopy based wrinkling characterization, accelerated lifetime measurements BAMFIT and destructive pull tests. The focus of this study was the systematic investigation of the heel region of the wire bond depending on process parameters and especially on the loop geometry regarding durability and lifetime. As first results, effects reducing durability were identified which are not apparent in normal testing and a recommendation for the use of reverse movements can be given.Energie-Umweltmanagemen
Using FusiX platform for Intelligent Energy Management Systems’ development
No full textScience.Research.Pannonia. 22A novel Decision Support System (DSS) development framework, named FusiX, with integrated
simulation support, Graphical User Interface (GUI) support and data fusion engine, is developed
to meet the needs of the modern building energy management sector. Its main objective is to facilitate and
streamline the development and the expansion of a complete DSS. FusiX constitutes a versatile base on
which Intelligent Energy Management Systems (IEMS) can be built, allowing a system engineer to incorporate
different data resources into a single intelligent system. Its data fusion engine can process heterogeneous
data from historic, real time sensed data, simulated and predicted data independently from their location
(local or remote). The software system is extended with a web-based GUI for efficient administration, exposing
all real-time measurements and available commands to authorized users, supporting user alerting, as
well as providing means to produce and export business and technical reports.Energie-Umweltmanagemen