Zoekresultaten

The City as Black Box: Navigating Through the Surplus of Information

Direct current in public lighting for improvement in LED performance and costs

Public lighting’s primary purpose is nighttime visibility for security and safety. How to meet so many requirements of so many stakeholders? The key to developing a good plan is to relate lighting to functions of public spaces, because street lighting is more than a technical requirement, a security need, or a design element. It can be thought of and utilized in terms of how the type, placement, and wattage affect how a street is perceived and used. With present-day used street lighting systems however, flexibility is expensive, as is maintenance and energy consumption. A new solution is to use LED lighting with a Direct Current power system. Advantages are a decrease in: energy conversions; material use; amount of switch- boxes; components; labour costs and environmental comfort. The overall implementation of LED and DC will result in better control and efficient maintenance due to integrated bidirectional communication. A challenge is the relatively high investment for these new solutions. Another challenge; DC is not a standard yet in rules and regulations. In the paper the transition to direct current public lighting system will be described with all the pros and cons. A new concept of public ownership, to overcome financial challenges will be discussed. M Hulsebosch1, P Willigenburg2 ,J Woudstra2 and B Groenewald3 1CityTec b.v., Alblasserdam, The Netherlands 2The Hague University of Applied Sciences, The Hague, The Netherlands 3Cape Peninsula University of Technology, Cape Town, South Africa 10.1109/ICUE.2014.6904186

Sizing Batteries for Power Flow Management in Distribution Grids

Battery energy storage (BES) can provide many grid services, such as power flow management to reduce distribution grid overloading. It is desirable to minimise BES storage capacities to reduce investment costs. However, it is not always clear how battery sizing is affected by battery siting and power flow simultaneity (PFS). This paper describes a method to compare the battery capacity required to provide grid services for different battery siting configurations and variable PFSs. The method was implemented by modelling a standard test grid with artificial power flow patterns and different battery siting configurations. The storage capacity of each configuration was minimised to determine how these variables affect the minimum storage capacity required to maintain power flows below a given threshold. In this case, a battery located at the transformer required 10–20% more capacity than a battery located centrally on the grid, or several batteries distributed throughout the grid, depending on PFS. The differences in capacity requirements were largely attributed to the ability of a BES configuration to mitigate network losses. The method presented in this paper can be used to compare BES capacity requirements for different battery siting configurations, power flow patterns, grid services, and grid characteristics.

‘Wie zijn de beste strategen’?

John Lewis Gaddis doceert militaire- en politieke strategie aan de Yale University en wordt gezien als de meest vooraanstaande historicus over de Koude Oorlog. In zijn recente studie over Herodotus, Sun Tzu, Von Clausewitz en andere grote strategen probeert de Amerikaan uiteen te zetten waarom bepaalde leiders succesvol waren en andere niet. Wat vergt een geslaagde Grand Strategy? https://spectator.clingendael.org/nl/publicatie/wie-zijn-de-beste-strategen LinkedIn: https://www.linkedin.com/in/martijn-lak-71793013/

An offshore energy simulation through flow networks: CEL within the MSP Challenge 2050 simulation game platform

This paper presents the design of the offshore energy simulation CEL as a flow network, and its integration in the MSP Challenge 2050 simulation game platform. This platform is designed to aid learning about the key characteristics and complexity of marine or maritime spatial planning (MSP). The addition of CEL to this platform greatly AIDS MSP authorities in learning about and planning for offshore energy production, a highly topical and big development in human activities at sea. Rather than a standard flow network, CEL incorporates three additions to accommodate for the specificities of energy grids: an additional node for each team's expected energy, a split of each node representing an object into input and output parts to include the node's capacity, and bidirectional edges for all cables to enable more complex energy grid designs. Implemented with Dinic's algorithm it takes less than 30ms for the simulation to run for the average amount of grids included in an MSP Challenge 2050 game session. In this manner CEL enables MSP authorities and their energy stakeholders to use MSP Challenge 2050 for designing and testing more comprehensive offshore energy grids.

Extinction internet

Extinction Internet is not merely an end-of-the-world phantasy of digital technology that one day will be wiped out by an electromagnetic pulse or the cutting of cables. Rather, Extinction Internet marks the end of an era of possibilities and speculations, when adaptation is no longer an option. During the internet’s Lost Decade, we’ve been rearranging the deck chairs on the Titanic under the inspirational guidance of the consultancy class. What’s to be done to uphold the inevitable? We need tools that decolonize, redistribute value, conspire and organize. Join the platform exodus. It’s time for a strike on optimization. There is beauty in the breakdown.Extinction Internet is Geert Lovink’s inaugural lecture, held on November 18, 2022 as Professor of Art and Network Cultures, within Modern and Contemporary Art History, Faculty of Humanities, University of Amsterdam.