Electricity use for applications in residential buildings

This report has a dual focus. The first goal was to increase the knowledge of how the use of electricity in a residential building is distributed. Electricity in residential buildings is used for lighting in common areas, elevators, pumps and many other appliances. The electricity used for these different parts is to a great extent unknown. A few studies have been carried out and the result of these is referred to in this report. By means of measurements and approximations the use of electricity for various appliances became known. The investigation showed that high consumers of electricity in residential buildings are ventilation, the general laundry rooms and lighting. When the approximate distribution of electricity was known, the next step was to take a closer look at electricity used for lighting. The second goal of the report was to find ways of how to decrease the amount of electricity used for lighting. One of the best ways to reduce the use of electricity for this purpose is to decrease the number of hours that the lighting is on. This is most often done by using sensors and can reduce the use of energy to a quarter of today's value