107 research outputs found
Walking a Tightrope: The dynamics of coordinating intra-organizational networks of practice
Get PDFHuysman, M.H. [Promotor]Hooff, B.J. van den [Copromotor
Data-driven Predictive Control for Heating Demand in Buildings: Method Development and Implementation at TU Delft Districht Heating Grid
No full textThis research is part of IPIN project (Smart Grid Innovation Programme) which aims to minimize the supply temperature for the TU Delft buildings by predicting and managing the buildings’ heat requirement and the heat supply. The prediction of heating demand is currently performed by a physic-based simulation tools which gives good estimations of the thermal energy demand of the building but it requires a large number of unknown input parameters (building & system characteristics). The estimation of these parameters is a time- & budget-consuming task, in addition to reducing the accuracy of the heating demand prediction. This thesis was proposed in order to give an optimal solution to the inconvenience mentioned above. The goal of this research is to study the possibility of using simple and fast mathematical models to predict the heating demand of the building with enough accuracy and physical meaning. The final model resulted in a multivariate linear equation defined by weather data, indoor air temperatures and the internal heat gains of the building. The equation shows a high predictive potential and accuracy level. The data collected from the previous season (2.5 months) are able to predict the next month with an accuracy in the range of 90-99%. This study concludes that the multivariate linear regression model is a more suitable predictive tool than a physics-based model for large scale implementations.Architecture and The Built EnvironmentOTBEnergy in Built Environmen
Knowledge sharing on Enterprise Social Media: Practices to Cope with Institutional Complexity
Get PDFThis study examines the use of enterprise social media (ESM) for organizational knowledge sharing and shows that professionals face ambiguities because their knowledge sharing behavior is informed by an institutional complexity that consists of 2 dissimilar institutional logics: Logics of the profession, and logics of the corporation. Our qualitative case study of an ESM at an IT consultancy organization shows that professionals find ways to manage the ambiguities they experience by engaging the affordances of ESM in such a way as to develop coping practices: Connection management, reputation management, and information management. By complementing the affordance perspective with an institutional logics perspective, we are able to advance scholarly understanding on how ESM can facilitate but also frustrate knowledge sharing
Implementation of exergy-calculations in an existing software tool forenergy-flow calculations in the early design stage
No full textMONICAIR, MONItoring & Control of Air quality in Individual Rooms: Eindrapportage MONICAIR Deel B
No full textMonitoringonderzoek energieverbruik woningen en ontwikkeling verbeterde berekeningsmodellen voor de bepaling van het energieverbruik.Het project is uitgevoerd met subsidie van het Ministerie van Economische Zaken, Subsidieregeling energie en innovatie (SEI), Topsector Energie, uitgevoerd door de Rijksdienst voor Ondernemend Nederland
Predicting energy consumption and savings in the housing stock: A performance gap analysis in the Netherlands
Get PDFResidential buildings are one of the key target sectors for energy and CO2 reduction. Research on the relationship between policy instruments and their effects is crucial for the continuous improvement of these tools. This thesis focuses on The Energy Performance of Buildings Directive (EPBD) as an EU flagship policy for technical improvements of the existing dwelling stock. At the core of the directive, an energy certificate is prescribed for all existing dwellings and is required to be present at moments of sale or rent. The certificate includes a theoretical consumption of each individual dwelling. However, theoretical models do not always correspond to reality with the desired accuracy. This large scale study explores the relation between the consumption assumed by the label certificate and the real consumption of the dwellings. It demonstrates that low performing dwellings have a theoretical consumption roughly two times the actual, while well performing dwellings consume one third less. These discrepancies are shown to have adverse effects on policy targets. Therefore, the thesis quantifies the causes of the discrepancies, looking into dwelling and household, as well as behavioural factors. There is a clear need for a more precise estimation of heating consumption on a broader, dwelling stock level in order to enhance the effectiveness of the current renovation policies. The thesis showed that using the current knowledge along with the growing amount of available data, there is enough motivation to reduce the performance gap by improving the predictions of actual dwelling consumption.OTB Research for the Built EnvironmentArchitecture and The Built Environmen
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