Energieffektivisering av flerbostadshus : Energibesparande åtgärder för Brf Lillåudden 3

The European Union’s goal for year 2020 aims to reduce the greenhouse gases by 20 % compared to the levels of 1990. This goal can be reached by increasing energy efficiency and renewable energy sources by 20 %. In Sweden housing stands for 40 % of the total energy usage and in apartment buildings district heating is the most used way for heating and hot water. In this degree project two apartment buildings, connected by a garage, have been studied to see which solutions would yield a saving in both money and the environment. The building is heated using district heating and is ventilated through mechanical exhaust ventilation. Analyzing the current energy consumption and ventilation rates, two heat pump manufacturers was contacted to see what their systems could save in terms of energy. By recovering heat from the exhaust air with a heat pump the buildings can save both money and have a reduced impact on the environment. Having a demand-controlled ventilation in the garage would not give a large enough saving in energy to be worth the investment. The already scheduled fans have decreased their energy usage by half. However by having a demand-controlled ventilation in the garage it could reduce the harmful heavy metals that get released when cars drive in and out. By simply lowering the temperature in the garage from 15 °C to 10 °C could save about 12 500 sek/year in heating costs. The conclusion to this study is that using a heat pump to recover energy from exhaust air is an investment that will generate financial savings for the cooperative apartment and have a reduced negative impact on the environment