Solenergisystem i Hammarby Sjöstad
Problems with the current energy system, which partially relies on non-renewable fuels, are increasingly recognized. Emissions of greenhouse gases from fossil fuels may speed up global warming, which in turn leads to a number of negative consequences. Nuclear energy is risky and relies on consumption of a scarce resource. This leads to a demand of renewable energy that is also economically feasible. One possible renewable source of energy is solar energy. This thesis investigates the possibilities of new solar energy systems in Hammarby sjöstad, a relatively new urban district in Stockholm, Sweden with a focus on sustainable development. Different technical solutions are presented along with their economic value for apartment houses in Hammarby sjöstad. The systems considered are based on either electricity generation by solar cells or heat generation by solar water heaters. Different uses of the obtained energy are discussed ? grid-connected systems, local direct current systems and heating of tap water. The results show that two technologies are profitable ? ordinary silicon cells and thin film cells in a local direct current system. Grid-connected systems are not profitable because of the cost of power converters, and also because of prohibition of net metering in Sweden. Solar water heaters are not profitable because there is currently no subsidy available.