Solceller på Kungliga Tekniska Högskolan : En förstudie för installation av solceller på Brinellvägen 66

Sammanfattning: The Earth receives 5.4 million exajoule in the form of radiation from the sun each year. To put this in perspective, it corresponds to about ten thousand times more energy than total human energy consumption per year. Solar energy is therefore a very interesting energy source that is also infinite, environmentally friendly and free to use. The interest in solar energy has increased sharply in Sweden in recent years. In June 2016, the Swedish government set a target where Sweden will use 100 percent renewable electricity generation in 2040, where solar electricity will contribute.This report investigates the possibility of solar cell installation at Brinellvägen 66 in Stockholm. The purpose of the report is to present the profitability of solar cells application on the roof of Brinellvägen 66 and determine how the solar cells are most conveniently installed.The report’s literature study addresses solar cell and components in solar cell systems, the electricity price, economics and local factors. The method is divided in two models. First, System Advisor Model (SAM) developed by the National Renewable Energy Laboratory (NREL) USA, is used to simulate the electricity generation from the solar cell system. Second, to calculate profitability, an investment calculation focusing on production cost (LEOC) where present value, discounted repayment time and internal rate are used. Available rooftop area for the solar cell system at Brinellvägen 66 is 30x6 meters. Two solar modules from SAM's database are used: Sunpower SPR-E20-327 and Jinko Solar JKMS270M-60 and both modules are available in the Swedish market. A sensitivity analysis is performed on selected factors that may affect the results from the method.The result that proved to be most profitable was a cell solar system of 60 Jinko Solar JKMS270M-60 modules, placed in rows of two. From the investment analysis, a production cost of 0,495 SEK/kWh was determined, a present value of 112 706 SEK, a discounted repayment period of 12 years and an internal interest rate of 7,7 percent.The result from System Advisor Model shows that optimal tilt angle for solar cells on Brinellvägen 66 is 42 degrees for one row, 35 degrees for two rows and 5-6 degrees for three rows. Optimal tilt angle decreases with the number of rows due to self-shading. A low Ground Cover Ratio (GCR) is preferred, which means that the rows should be placed as far apart as possible for best results.