Jämförelse av solhybrider
Research in solar energy is taking big steps in both solar heating and solar electricity. It´s not only the technologies alone, but also the combination of both solar electricity and solar heating which is what is called a solar hybrid. The idea of a solar hybrid is that a solar cells efficiency decrease with increased temperature and can with help from a solar collector be cooled and the heat can be utilized. This thesis report compares heat production and electricity production with respect of, in first hand, a solar hybrids geometry in the cooler. The theory chapter describes solar heating and how different solar cell technologies work and their environmental impact at the production and how compatible these technologies are for the solar hybrid. A detailed description over the formulas about solar flux and the energy flows of a solar hybrid are also in the theory chapter. The first system is located on Per Wickmans house in Öjaby outside of Växjö and uses an aluminum absorber. The second system is located in Lenhovda at Lenhovda radiatorfabriks roof and uses a sheet of glass under the solar cell instead of a plastic film that the other hybrids have, this hybrid uses a flat steel absorber. The third system is located in Åseda at Åseda Värme och Sanitets roof and uses a copper pipe absorber. With the aluminum absorber in Öjaby it was produced 1,2 kWh/m2 electricity and 4,95 kWh/m2 heat. To reach the need of electricity for an arbitrary house for a day in May it needs 15,8 m2 solar hybrid and 22,5 m2 extra solar heating panels to cover the need of heat.