This dissertation was written as a part of the MSc in Energy Building Design at the International Hellenic University. Its purpose is to estimate the potential energy savings and the emissions reduction for typical residential building s over the last 10 years from the use of Domestic Solar Hot Water Systems (D SHWS) in countries of the European Union (EU). The major parameters that were taken into consideration were t he total installed glazed area of each country, the energy produced from a typical DSHWS and the emission factors of produced electricity along with the amount of energy produced by the DSHWS so as to provide an estimation of the quantity of Green House Gas (GHG) emissions that can be saved. System Advisor Model (SAM) was used in order to make the calculations, find the optimum angle for the collectors according to the countries’ latitude and the estimations for the energy savings and the emissions reduction. The simulation results showed that as the latitude increases, solar fraction is decreasing. It ranges from 44,3% in Dusseldorf (51,28 o ) to 77,6% in Larnaca (34,88 o ). There is room for improvement for energy savings with Cyprus presenting the highest reaching almost 5,7% compared to its residential energy consumption. The quantity of CO 2 emissions saved was higher in Germany reaching almost 3,8 mill ion tons of CO 2 taking into consideration the emission factors of produced electricity along with the amount of energy produced by the DSHWS and the installed collect or area of each country.
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