Energieffektiva åtgärder för flerbostadshus

• Main Author: Edlund, Fredrik
• Format: Others
• Language: Swedish
• Published: Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013) 2014
• Subjects: energi; effektivisering; koldioxid
• Online Access: http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-37058

Energy is a hot topic in today's society. Both businesses and individuals are trying to reduce their spending costs by saving kWh. There are many various saving measures to reduce energy consumption. Reducing energy consumption leads to a reduced carbon footprint as less fuel is burned in facilities that generate emissions. This report will focus on heat pumps, solar technologies and interventions in the building envelope for a multi-dwelling house.   How much energy can be saved from a measure? What impact does it have on the climate? Is it economically viable to invest in the measure? These issues are of importance both for the investor and future generations. In the report, these questions are answered and applied in a multi-dwelling house in Karlstad built in the 1960's with an energy consumption of 129 kWh/m2 and year. The study is a collaboration with HSB.   The building was recreated in a simulation program, VIP-Energy, for a basic case to start from. Then the measure were simulated both individually and in combination to see how effective they are in the building. These measures may lead to an increased electricity consumption, which was taken into account in the calculations of the climate impact if it led to an increased or decreased amount of CO2 emissions. All these measures are designed to reduce energy consumption, leading to a decrease in energy cost.   The results showed that these measures lead to a saving of energy consumption in all cases. The resulting reduction in energy consumption varies between 5-50% on the various measures individually, but the savings do not differ as much. The reason for this is the technical lifetime of the measures, which means that the total savings do not reflect the reduction in energy savings. Reduced CO2-emissions is much more difficult when the building is connected to a district heating plant that also produces electricity, known as a combined heat and power plant, which makes the reduced heat generation leads to reduced power generation. This means that the electricity has to be generated from another source, for Sweden this means imports of electricity from a coal condensing power plant. Electricity from the power plant is in this case CO2-compensated, which means that the fuel comes from a renewable source. In order to have reduced CO2-emissions, it requires that you have your own production of electricity from CO2-compensated or renewable sources.