Identifiering av energianvändningen hos en kontorsfastighet i en svensk tätort : - en fallstudie med beräkningsinslag

Sammanfattning: The current climate changes require a global response immediately. Every year the use of energy increases, which means that more and more greenhouse gases are released. Which in turn helps accelerate global warming. To reduce the energy use will not be an easy task for mankind. Household and service accounts for about 40% of Sweden’s energy use, and office buildings prove to be among the most energyintensive. Previous research shows that heat-, ventilation- and cooling systems along with lightning are the systems that provide the highest energy consumption and that there is also a great savings potential. In this study, the energy use of a property in a Swedish urban area has been investigated and how the energy is being used by the different systems has been identified. The purpose of this research is to see which measures can give the greatest cost-effective savings. Method used is a case study, which was an energy survey, combined with a literature review of relevant information. Data collection consisted of information from the property owner,inspection of the building and electricity measurements. The result shows that there are great savings to be made. If proposed measures are implemented (see section 4.6), energy consumption for heating can be reduced by 144,9 MWh/year or 32,4%. Energy used by lightning can be reduced by 46,8 MWh/year or 40,3%and other measures can be reduced by 41 MWh/year or 53%. Measures that can be performed for free were considered the most cost-effective, such as lowering the indoor temperature or turning off equipment between days. For measures with investment cost, isolation of the attic was considered most cost -effective with a payoff time of 5 years. To invest in sun cells would reduce the bought electricity with 56,8 MWh/yr. Due to lack of information, assumptions and simplifications were made that could have caused sources of error.