schoonschip: phase II 1 100% renewable heat and hot water supply directly by installing fresnel lenses and fine wire heat exchangers on any greenhouse structures. The estimated cost of the materials for this step is 550 € and 20 hours of labor. Based on the current urban plan, not all boats will have greenhouses due to building height restrictions, therefore this will only apply to the households that do. 2 100% renewable electricity supply require 20 hours of installation time. The exact capacity of the system will depend on how successful boat users are at reducing their electricity demand through implementing efficiency measures. This cost estimate also includes a DIY concentrator and tracking system and an inverter (shared by the entire community). In phase two, installation of electric power generation capacity and the expansion of the heat collection system will allow for each household to have a fully renewable heat and hot water supply. Electric boilers will now provide top-up heating supplied from electricity from renewable energy. COST & LABOR ESTIMATES The costs for upgrading to a fully renewable heat supply lie primarily in securing renewable electricity generation capacity. Additionally, renewable heat generation can be boosted In this phase, the community should invest in solar panels. During the first phase, which will stretch over a year, households can monitor their actual demand for electricity, enabling them to scale their purchase of solar panels to the right amount. Despite the relatively low solar irradiance, the most practical and economically feasible solution for this scale is still solar photovoltaic cells. COST & LABOR ESTIMATES We estimate that an inexpensive DIY solar PV system will cost around 6.000 € per boat, and Pagina 84
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