2,020 Works

Solar Tree (Out of competition)

Arnold Knott, Dorthe H. Lund, Thomas Andersen & Jens Martin Dandanell
The combination of art, green energy and environment was the motivation for building a “solar tree”. The tree consists of a mechanical basis built of construction steel surrounded by the wood of a real tree. The branches of a real tree, fixed to the trunk are holding seven big artificial leaves. On top of them, we mounted solar cells, which are capable of delivering energy to a power outlet, installed in the trunk of the...

APPLICATION OF FUZZY INFERENCE SYSTEMS FOR WATER QUALITY MODELLING

Chandra Sekhar Matli & Chandra Sekhar Matli
The Krishna river is subjected to a varying degree of pollution, caused by numerous outfalls - municipal and industrial effluents and by other human activities. The main sources leading to pollution in the river include municipal wastewater from urban areas of Hyderabad and Nalgonda, and wastewater from a variety of industries. Non-point runoff is generated by precipitation that washes and cleanses the air and land surface and then transports, a variety of materials, such as...

Solfangere belyst ved matematik

Andreas Gram Sørensen, Casper Vestergaard Nissen, Jacob Stilling Nørregaard, Jens Steemann Kristensen, Lasse Tidemann, Søren Wrang, Carsten Schmidt & Connie Ørbæk
This Project uses mathematical methods to analyse solar collectors. There are made some assumptions to make things easier but without too many changes it can easily be made more realistic. The project ends up with a couple of methods for finding the total energy intake of a solar collector. Some of the methods are easier to handle but harder to calculate. Finally the project analyses some examples that relate to the real life and it...

Applying CDIO Standard 1 in an Engineering Communications Course

Rick Sellens & Paula Klink
CDIO Standard 1 requires that Engineering Practice (CDIO) form the context of engineering education. While retaining the same basic activities the course was re-contextualized in four significant areas: Deliverables model, Assessment model, Role of Academic Assistants, and Improved Peer Mentoring. In each case the experience was tailored to resemble work in engineering practice rather than an academic exercise.

Development of the San Diego creek natural treatment system

E. Strecker, P. Mangarella, N. Brandt, T. Hesse, K. Rathfelder & M. Leisenring
A Natural Treatment System (NTS) Master Plan that includes a watershed-wide network of constructed wetlands was evaluated for treatment effectiveness of dry weather base flows and runoff from smaller more frequent storms in a 120 square mile (311 km2) urban watershed. The goal of the \342\200\230regional retrofit\342\200\231 wetland network is to serve as an integral component in watershed-wide Best management Practices (BMPs) for compliance with pollutant loading limits (TMDLs) requiring discharge limits of sediments, nutrients,...

Role of pore–scale heterogeneity on reactive flows in porous materials: validity of the continuum representation of reactive transport

Qinjun Kang, Peter Lichtner & Peter Lichtner
Understanding multi-component reactive transport in porous media is critical to a wide range of fields. It poses great challenges to theoretical, experimental, as well as numerical studies, because it usually involves multiple processes (advection, diffusion, reaction) and multiple scales (molecular, pore, laboratory, field). Current modeling approaches commonly employ a continuum description and rely on volume averages. Because in porous media, averages are taken over length scales much larger than typical grain sizes, spatial heterogeneity at...

Sequencing the integration of content and language: an inventory of student experience and understanding

Andreas Eriksson & Carl Johan Carlsson
This presentation explores students' perception of writing and communication interventions during the first three years of a CDIO-based engineering programme. The focus is on scaffolding strategies and learning activities and how these promote a progressive understanding of writing as an engineer, both in academia and in the workplace.

Hygrothermal Properties and Performance of Sea Grass Insulation

Theresa Back Laursen, Marlene Stenberg Hagen Eriksen, Theresa Back Laursen & Marlene Stenberg Hagen Eriksen
Historically, sea grass has been known and used for years as thermal insulation material. However, it is not recognized as a contemporary building material, and thus information regarding its hygrothermal properties and performance in modern constructions is scarce. In the attempt to create an image of the hygrothermal properties of sea grass as thermal insulation, experiments have been carried out in the laboratory to determine the thermal conductivity, the sorption curves and the water vapour...

Culture in engineering education - CDIO as a frame for developing intercultural competences

Birgitte Hoffmann, Ulrik Jørgensen & Hans Peter Christensen
As engineers today often work in intercultural projects and contexts, intercultural compe-tences must be part of the learning objectives in engineering educations. This is in line with the CDIO programme; however, the programme, as well as the teach-ing practises, undoubtedly needs to further develop approaches to cultural aspects in engineering education. Hence the key-question of this paper is how CDIO support the development of intercul-tural competences in engineering education, and the paper explores the implementation...

Integrated stormwater strategies to reduce impact on receiving waters

J. German, M. Vikstr\303\266m, G. Svensson & L.-G. Gustafsson
The aim of this study was to evaluate the influence of the city of \303\226rebro, where it is no com-bined sewers, on pollution load to the receiving water the river Svart\303\245n. GIS and hydrologic modelling was used to achieve this. The subcatchments in the city that accounted for the highest discharges of pollutants was identified and measures to reduce the load from these subcatchments was proposed. It was shown that stormwater was the most important...

Evidence on dynamic effects in the water content - water potential relation of building materials

Gregor Scheffler, Rudolf Plagge & Gregor Scheffler
Hygrothermal simulation has become a widely applied tool for the design and assessment of building structures under possible indoor and outdoor climatic conditions. One of the most important prerequisites of such simulations is reliable material data. Different approaches exist here to derive the required material functions, i.e. the moisture storage characteristic and the liquid water conductivity, from measured basic properties. The current state of the art in material modelling as well as the corresponding transport...

Practical measurement of stormwater events \342\200\223 Not a trivial task

T. Mietzel, T. Frehmann, R. Kutzner, M. Becker & W.F. Geiger
Setting up and maintaining monitoring stations is a common, but not trivial task for engineers working in the field of urban water management. Especially when faced with this task for the first time, it is difficult to find applied literature that gives answers to common problems with measuring equipment. The experience gathered during three major studies at stormwater treatment facilities, is summarized in this paper. The measuring included level measurement and flow measurement with different...

A comparison of strategies to encourage regular study and foster deep learning

Sylvie Dore
Three strategies were devised to encourage regular study and foster deep learning. Students were: 1.asked to draw a map of the course material that was to be covered in the coming week; 2.asked to produce an individual map of the material covered the previous week; 3.given the choice between drawing a map, writing a summary or attending a 10 minute quiz given at the beginning of the lecture, all on the material covered the previous...

Assessment of extraneous water inflow in separated sewer networks

C. Karpf & P. Krebs
Separate sewer systems provide due to the separate transport and treatment of waste water and rain water an efficient sewerage technology. But the advantage compared to combined system technology gets lost if the input of extraneous water exceeds the capacity of the system. Especially the input of rainwater into the waste water pipes depending on the drained area is responsible for an overload of the sewer system and the wastewater treatment plant (WWTP). In the...

SPIRIT: Towards an interactive tool for predictive asset management of sewer systems

A.S. Beenen, H. Vis, P. J. Van Gestel & A. Rabenort
SPIRIT is an interactive tool for predictive asset management. SPIRIT is a software plug-in for sewer management packages that uploads the actual state and environmental factors to a central databaseon the Internet. SPRIT downloads the prediction of the sewer condition in 5 respectively 10 years from the uploaded actual state. This interactivity improves the model by a self learning proces and results in a typical win-win situation. The RIONED Foundation is the national not-for-profit knowledge...

Reducing detention volumes with improved outlet structure

B. P. Tullis, E. C. Olsen & K. Gardner
Detention basin outlet flow control structures typically include a weir, orifice, and/or culvert. One disadvantage of these types of control structures is that the flow rate continually varies with the water level in the detention basin. The corresponding outflow hydrographs for such control structures are typically bell shaped, with the maximum allowable peak flow duration lasting only a \342\200\234moment\342\200\235 at the point where the rising leg of the hydrograph transitions to the falling leg of...

CDIO as the educational and cultural structuring element in the DTU B.Eng. in Electronics education

Claus Kjaergaard, Peter Brauer & Jens Christian Andersen
The aim of this paper is to describe how a CDIO based four semester study can be documented in such a way that a homogeneous quality can be maintained over time. Also when teaching staff changes, the purpose is to help new teachers to fully understand their role and obligations, not only in their particular course, but also as a part of the complex CDIO based education. A master document has been developed to document...

Dynamic modeling of detention tanks for flood control in urban drainage systems in developing countries

P. Sreeja, K. Gupta & O. Mark
ABSTRACT Increasing urbanization and high population density have resulted in an increase in the impervious areas in the cities. This results in flooding and overloading of existing drainage systems. Implementing structural measures for controlling urban flooding are extremely difficult due to the space constraints in densely populated cities in developing countries. An alternative cost effective solution can be achieved by implementing a control strategy for the existing control structures at different locations in the drainage...

Advanced stormwater runoff characterization

M. Kayhanian
During the past seven years the California Department of Transportation has developed an extensive stormwater characterization program to evaluate the physical, chemical and biological quality of the runoff from their representative facilities. Initially the program has utilized many laboratories and environmental consultants who may not have necessarily used the same method of sample collection, quality assurance and quality control, data reporting and data validation standards. Faced with this deficiency, a set of standard protocols and...

The effect of climate change on urban drainage: An evaluation based on regional climate model simulations

M.Grum, A. T. J\303\270rgensen, R. M. Johansen & J. J. Linde
That we are in a period of extraordinary rates of climate change is today evident. These climate changes are likely to impact local weather conditions with direct impacts on precipitation patterns and urban drainage. In resent years several studies have focused on revealing the nature, extent and consequences of climate change on urban drainage and urban runoff pollution issues. This study uses predictions from a regional climate model to look at the effects of climate...

New Act Legislated in Japan for Well-balanced Hydrological System and Urban Inundation Prevention

A. Okashita & K. Ogata
This paper presents the new act legislated in Japan for well-balanced hydrological system and urban inundation prevention. The comprehensive mitigation measures for flood control have been carried out by the government for nearly 30 years. Since it does not have a legal basis to stand on, there is a limitation to implement the measures on a mandatory basis. In order to supplement this disadvantage, the new act was constituted to bridge the existing laws such...

Assessment of runoff contributing catchment areas in rainfall runoff modelling

S. Thorndahl, C. Johansen & K. Schaarup-Jensen
In numerical modelling of rainfall caused runoff in urban sewer systems an essential parameter is the hydrological reduction factor which defines the percentage of the impervious area contributing to the surface flow towards the sewer. As the hydrological processes during a rainfall are difficult to determine with significant precision the hydrological reduction factor is implemented to account all hydrological losses except the initial loss. This paper presents an inconsistency between calculations of the hydrological reduction...

The integrated unit process design approach for source control and best management practice design

M.M. Quigley, E.W. Strecker, M. Leisenring, W.C. Huber, J. Heaney, N. Weinstein, J. Sansalone & D. Bodine
Research being conducted by the authors under the National Cooperative Highway Research Program project \342\200\234Evaluation of Best Management Practices for Highway Runoff Control\342\200\235 and the Water Environment Research Foundation project \342\200\234Critical Assessment of Stormwater Treatment and Control Selection Issues\342\200\234 seeks to advance the state of the practice of stormwater design through the application of basic scientifically and technically sound engineering principals using a fundamental unit process design methodology. The research findings are being incorporated into...

An optimal switching mechanism for a combined Picard- Newton method for the solution of Richards´equation

Javier Aparicio, Álvaro Aldama, Claudio Paniconi, Mario Putti & Javier Aparicio
Richards’ equation, describing flow in partially saturated porous media, contains strong nonlinearities arising from pressure head dependencies in soil moisture and hydraulic conductivity. Additionally, the time- dependent nature of boundary conditions can alter the nonlinear characteristics of equation during a transient simulation. Various iterative methods are used for solving this nonlinear equation, most commonly the quadratically convergent Newton – Raphson technique and the simpler but only linearly convergent Picard method (successive approximation). The initial solution...

Superconducting wind turbines

Adam Hoffmann Klingest, Alexander Barington, Bjarke Nordentoft Madsen, Daniel Bjørneboe, Kean Hansen, Rosario Borrasso, Sébastien Massin, Stig Högberg, Walid Ziad El-Khatib, Bogi Bech Jensen, Jørn Bindslev Hansen, Asger Bech Abrahamsen & Mads Peter Sørensen
In this project we shall investigate the feasibility of using type II high temperature superconductors in electric generators of future off shore wind turbines. High temperature superconductors can be used to generate a considerable higher magnetic field than in classical magnet designs and thereby reduce weight. The purpose is to assess the technical and economical feasibility of using superconducting generators for sea based wind turbines producing 10-20 MW.

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