Economic Feasibility for Solar PV in Swedish Office Buildings - A Case Study Approach

Examensarbete för masterexamen
Master Thesis
Sustainable energy systems (MPSES), MSc
Johansson, Nina
Karlsson, Jesper
Boverket, a governmental agency in Sweden, has the goal to regulate so that all new buildings will be near zero energy buildings from 2020 and one way to reach this goal is to install a solar photovoltaic (solar PV) system on the building. Commercial buildings, such as office buildings, usually have a daily electricity use profile that is well matched with electricity generation from a solar PV system. The price for solar PV today is about a fifth of the price in 2006. Under these conditions, it is interesting to investigate the potential for using solar PV in Swedish office buildings. The purpose of this thesis is to investigate the economic feasibility for solar PV in Swedish office building from a technical, economical and legal perspective. The purpose is also to investigate existing PV system installations in office buildings. These purposes are processed with help of a number of research objectives where load profiles were studied for buildings with different cooling systems, evaluation of existing PV systems and an economic analysis of PV systems with different locations, orientations, slope angles for different load curves were performed. The research objectives were examined with a case study approach. Measured data for property electricity load and electricity generation from existing PV systems for five different office buildings was examined. An analysis of the matching of electricity load and electricity generation for existing PV systems for five buildings was made in order to investigate how the systems were sized and mounted with respect to the available roof space, roof conditions and electricity load for the buildings. The electricity load data was then used in the study where simulated electricity generation for different system configurations with different slope angles, orientations and azimuth angles were matched with the property electricity load profiles for the examined buildings. This matching was then used in an economic evaluation with today´s technical, legal and economic conditions to evaluate how different system configuration affects the profitability. The conclusions that could be drawn from this study are that a PV system investment can be profitable with today´s conditions from a property owner’s perspective and that the choice of slope and azimuth angles for a PV installation is important for the profitability. There is an optimal system size in terms of profitability which is different for different electricity load profiles. At this optimum there was some percent of overproduction. An increased use of solar PV in Sweden is possible; the technical, legal and economic conditions are today good enough. However, a study including a larger number of buildings corresponding to typical Swedish office buildings is required to draw any general conclusions regarding the potential of solar PV.
Building Futures , Energi , Hållbar utveckling , Energisystem , Building Futures , Energy , Sustainable Development , Energy Systems
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