The Johan Cruijff ArenA (JC ArenA) is a big events location in Amsterdam, where national and international football matches, concerts and music festivals take place for up to 68,000 visitors. The JC ArenA is already one of the most sustainable, multi-functional stadia in the world and is realizing even more inspiring smart energy solutions for the venue, it’s visitors and neighbourhood. The JC ArenA presents a complex testbed for innovative energy services, with a consumption of electricity comparable to a district of 2700 households. Thanks to the 1 MWp solar installation on the roof of the venue, the JC ArenA already produces around 8% of the electricity it needs, the rest is by certified regional wind energy.Within the Seev4-City project the JC ArenA has invested in a 3 MW/2.8 MWh battery energy storage system, 14 EV charging stations and one V2G charging unit. The plan was to construct the 2.8 MWh battery with 148 2nd life electric car batteries, but at the moment of realisation there were not enough 2nd life EV batteries available, so 40% is 2nd life. The JC ArenA experienced compatibility issues installing a mix of new and second-life batteries. Balancing the second-life batteries with the new batteries proved far more difficult than expected because an older battery is acting different compared to new batteries.The EV-based battery energy storage system is unique in that it combines for the first time several applications and services in parallel. Main use is for grid services like Frequency Containment Reserve, along with peak shaving, back-up services, V2G support and optimization of PV integration. By integrating the solar panels, the energy storage system and the (bi-directional) EV chargers electric vehicles can power events and be charged with clean energy through the JC ArenA’s Energy Services. These and other experiences and results can serve as a development model for other stadiums worldwide and for use of 2nd life EV batteries.The results of the Seev4-City project are also given in three Key Performance Indicators (KPI): reduction of CO2-emission, increase of energy autonomy and reduction in peak demand. The results for the JC ArenA are summarised in the table below. The year 2017 is taken as reference, as most data is available for this year. The CO2 reductions are far above target thanks to the use of the battery energy storage system for FCR services, as this saves on the use of fossil energy by fossil power plants. Some smaller savings are by replacement of ICEby EV. Energy autonomy is increased by better spreading of the PV generated, over 6 instead of 4 of the 10 transformers of the JC ArenA, so less PV is going to the public grid. A peak reduction of 0.3 MW (10%) is possible by optimal use of the battery energy storage system during the main events with the highest electricity demand.
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Purpose: The purposes of this study were, first, to (re)design the user-interface of the activity tracker known as the MOX with the help of input from elderly individuals living independently and, second, to assess the use of and experiences with the adapted Measure It Super Simple (MISS) activity tracker in daily life. Methods: The double diamond method, which was used to (re)design the user-interface, consists of four phases: discover, define, develop, and deliver. As a departure point, this study used a list of general design requirements that facilitate the development of technology for the elderly. Usage and experiences were assessed through interviews after elderly individuals had used the activity tracker for 2 weeks. Results: In co-creation with thirty-five elderly individuals (65 to 89-years-old) the design, feedback system, and application were further developed into a user-friendly interface: the Measure It Super Simple (MISS) activity. Twenty-eight elderly individuals (65 to 78-years-old) reported that they found the MISS activity easy to use, needed limited help when setting the tracker up, and required limited assistance when using it during their daily lives. Conclusions: This study offers a generic structured methodology and a list of design requirements to adapt the interface of an existing activity tracker consistent with the skills and needs of the elderly. The MISS activity seemed to be successfully (re)designed, like the elderly who participated in this pilot study reported that anyone should be able to use it.
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Citizens regularly search the Web to make informed decisions on daily life questions, like online purchases, but how they reason with the results is unknown. This reasoning involves engaging with data in ways that require statistical literacy, which is crucial for navigating contemporary data. However, many adults struggle to critically evaluate and interpret such data and make data-informed decisions. Existing literature provides limited insight into how citizens engage with web-sourced information. We investigated: How do adults reason statistically with web-search results to answer daily life questions? In this case study, we observed and interviewed three vocationally educated adults searching for products or mortgages. Unlike data producers, consumers handle pre-existing, often ambiguous data with unclear populations and no single dataset. Participants encountered unstructured (web links) and structured data (prices). We analysed their reasoning and the process of preparing data, which is part of data-ing. Key data-ing actions included judging relevance and trustworthiness of the data and using proxy variables when relevant data were missing (e.g., price for product quality). Participants’ statistical reasoning was mainly informal. For example, they reasoned about association but did not calculate a measure of it, nor assess underlying distributions. This study theoretically contributes to understanding data-ing and why contemporary data may necessitate updating the investigative cycle. As current education focuses mainly on producers’ tasks, we advocate including consumers’ tasks by using authentic contexts (e.g., music, environment, deferred payment) to promote data exploration, informal statistical reasoning, and critical web-search skills—including selecting and filtering information, identifying bias, and evaluating sources.
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In de komende decennia zullen batterijen (vooral Li-ion) veelvuldig ingezet worden voor de opslag van elektrische energie. De belangrijkste toepassing zal die in elektrische voertuigen zijn. Batterijen verouderen en daarom is het van belang om de gezondheidstoestand van een batterij te kunnen schatten. Met deze schatting wordt bepaald of deze batterij in de eerste toepassing bruikbaar blijft of dat deze beter geschikt is om in een second-life toepassing geplaatst te worden. Uiteindelijk zullen de batterijen gerecycled worden. Tijdens gesprekken met bedrijven, waarvan de meeste in het consortium deelnemen, werd het duidelijk dat er veel praktijkvragen zijn rondom batterijen en hun hergebruik. In het bijzonder is er nood aan praktisch inzetbare methoden om de gezondheidstoestand en restlevensduur van gebruikte batterijen te bepalen. Uitgangspunt is om hiervoor rekenmodellen in te zetten. Bestaande modellen zullen doorontwikkeld worden zodat ze de gezondheidstoestand van batterijpakketten kunnen inschatten. Voor de validatie van deze modelen zijn geschikte meetdata nodig. Hiervoor wordt een (nieuwe) meetopstelling gebouwd die mogelijk de basis kan worden van een merk-onafhankelijke batterijtest. Tegelijkertijd worden methoden vastgelegd voor validatie met meetdata uit het veld. Ook de vraag hoe een batterijpakket, op een veilige manier, gerepareerd kan worden is onderdeel van het project. Eenmaal de gezondheidstoestand van een batterij bepaald is, is de vervolg vraag hoe de restlevensduur van ervan bepaald kan worden aan de hand van de soort data die beschikbaar zijn. Deze restlevensduur is verder afhankelijk van de typische inzet in de second-life toepassing. Het vaststellen en bepalen van de bepalende kenmerken van deze inzet is eveneens onderdeel van het onderzoek. Tot slot wordt de economische haalbaarheid bepaald om het gebruik van batterijen te verlengen in eerste of second-life toepassingen. De uitkomsten van dit onderzoek zullen bijdrage om de consortiumleden inzicht te geven in de gebruiksmogelijkheden van batterijen in de verschillende duurzame toepassingen.
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