Untersuchungsergebnisse zur Energieoptimierung der Wärmeversorgung eines Maschinenbauunternehmens

Angesichts der Verknappung fossiler Brennstoffen und sich ändernder Rahmenbedingungen sind industrielle Energieversorgungssysteme immer höheren Anforderungen an Energieeffizienz und Energieflexibilität ausgesetzt. In der vorliegenden Forschungsarbeit werden daher verschiedene Energieversorgungssysteme am Beispiel eines Maschinenbauunternehmens auf dem gegenwärtigen und zukünftigen Strommarkt untersucht. Die Untersuchungen werden mit einem Simulationsmodell in der Simulationssoftware „Dymola“ durchgeführt. Der Hauptuntersuchungsgegenstand ist ein Blockheizkraftwerk (BHKW). Der Schwerpunkt liegt auf den Wechselwirkungen des BHKW mit einem möglichen Wärmerückgewinnungssystem und unter Berücksichtigung zukünftiger Strompreisszenarien in verschiedenen Konfigurationen. In diesem Zusammenhang wird auch eine bivalente Wärmeversorgung untersucht. Dieser Beitrag fasst wesentliche Forschungsergebnisse, die während der Betreuung und Anfertigung der Masterarbeit von Nils Neuberger entstanden sind, zusammen

Assessing self-management in patients with diabetes mellitus type 2 in Germany: validation of a German version of the Summary of Diabetes Self-Care Activities measure (SDSCA-G)

Kamradt M, Bozorgmehr K, Krisam J, et al. Assessing self-management in patients with diabetes mellitus type 2 in Germany: validation of a German version of the Summary of Diabetes Self-Care Activities measure (SDSCA-G). Health and Quality of Life Outcomes. 2014;12(1): 185

Simulation Modeling for Energy-Flexible Manufacturing: Pitfalls and How to Avoid Them

Due to the high share of industry in total electricity consumption, industrial demand-side management can make a relevant contribution to the stability of power systems. At the same time, companies get the opportunity to reduce their electricity procurement costs by taking advantage of increasingly fluctuating prices on short-term electricity markets, the provision of system services on balancing power markets, or by increasing the share of their own consumption from on-site generated renewable energy. Demand-side management requires the ability to react flexibly to the power supply situation without negatively affecting production targets. It also means that the management and operation of production must consider not only production-related parameters but also parameters of energy availability, which further increase the complexity of decision-making. Although simulation studies are a recognized tool for supporting decision-making processes in production and logistics, the simultaneous simulation of material and energy flows has so far been limited mainly to issues of energy efficiency as opposed to energy flexibility, where application-oriented experience is still limited. We assume that the consideration of energy flexibility in the simulation of manufacturing systems will amplify already known pitfalls in conducting simulation studies. Based on five representative industrial use cases, this article provides practitioners with application-oriented experiences of the coupling of energy and material flows in simulation modeling of energy-flexible manufacturing, identifies challenges in the simulation of energy-flexible production systems, and proposes approaches to face these challenges. Seven pitfalls that pose a particular challenge in simulating energy-flexible manufacturing have been identified, and possible solutions and measures for avoiding them are shown. It has been found that, among other things, consistent management of all parties involved, early clarification of energy-related, logistical, and resulting technical requirements for models and software, as well as the application of suitable methods for validation and verification are central to avoiding these pitfalls. The identification and characterization of challenges and the derivation of recommendations for coping with them can raise awareness of typical pitfalls. This paper thus helps to ensure that simulation studies of energy-flexible production systems can be carried out more efficiently in the future

Model-Based Planning of Energy Flexible Technical building Services in Production Plants to Integrate Variable Renewable Energies

The renunciation of fossil energies and the associated large-scale deployment of variable renewable energy (VRE) sources provides special challenges for future electric power grids. To maintain the security of energy supply, an adjustment of the electrical energy demand to the energy production becomes increasingly important. Industrial plants are large energy consumers and therefore essential in stabilizing the power grid. Systems of the technical building services are particularly suitable for a more flexible use of the electricity consumption due to the usually high energy demand of these facilities and the independence from the production process. As a result, process reliability is not directly jeopardized. This paper introduces a model-based approach to evaluate energy flexibility of those supply systems already in the planning phase of factories. This enables a strategic planning to cover the useful energy demand of production machinery with the most flexible electrical power consumption possible