Prefabricerade Passivhus
EnergiberäkningsprogramEnergikravEU-beslutKlimatskalPassivhusPrefabriceringSpecifik energianvändning
European Union has made a new decision that all new built houses by 2020 shallbe near-zero energy houses. Boverket?s definition of near-zero energy housesintends buildings with good energy performance in which a proportion of theamount of energy that must be added to the building is made of renewable energy.Passive House is a set of requirements from FEBY designed to build energyefficient buildings. This is achieved by reducing loss of heat through the buildingenvelope and to take advantage of the passive heat from solar radiation,installation and heat sources like people living in the house.This project has been made with help of Anebyhus and one of their model houseshave been examined from the report?s issues, including Anebyhus?s energyperformance, requirements for the manufacturing and assembly, how theenvelope must be improved to fulfill the requirements for the Passive House andwhat energy calculation programs are available on the market.The report aims to provide solutions for energy efficient houses that are adaptedfor production of house building.Two visits to Anebyhus has been done to study their manufacture and assemblyof building elements. The Energy calculation programs that have beeninvestigated calculates the specific energy consumption of a building.Anebyhus manage today BBR?s requirement of 55 kWh/m2 and year, but has notbegun designing or building any Passive Houses. They have no specialrequirements for the design of their houses only that it should be possible to buildusing their present manufacturing and assembly process. The dimentions of thebuilding elements is mainly restricted by the ability to transport the items on thetruck to the construction sites.The important part of prefabricated construction is the assembly because it isimportant that the house is built tightly so that no moisture or air leakage gets into or out of the building. This is particularly important in Passive House buildingas the construction making demands higher accuracy.The focus of the report is on the building envelope to Anebyhus?s model house.To manage the stricter requirements that Passive House needs the whole buildingenvelope needs to be replaced with better insulated constructions. Also theheating and ventilation systems must be changed to handle the requirements.Energy calculations were made both by hand and by using the energy calculationprogram TMF. The results show that the Passive House we studied just manageFEBY?s demands for a Passive House, which is 50 kWh/m2 and year when solarpanels are installed on the roof to cover the needs for hot water in the summer.The conclusion is that Anebyhus doesn?t have a particularly long way to go in thePassiv House technique, as the house Sadelvägen, which we studied, basicallyfulfill the requirements for a low-energy house. To meet the requirement withoutthe solar panels, extra insulation would be needed, though the machines atAnebyhus aren?t capable of that today.