Economical optimization of building elements for use in design of nearly zero energy buildings

Sanne Hansen

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    Nearly zero energy buildings are to become a requirement as part of the European energy policy. There are many ways of
    designing nearly zero energy buildings, but there is a lack of knowledge on how to end up with the most economical optimal
    solution. Therefore this paper present a method for finding the economical optimal solutions based on the use of the cost of
    conserved energy for each main building envelope part and building service system and cost of produced energy for each
    energy producing system. By use of information on construction cost and developed models of the yearly energy use for each
    component, a function is set up that represents the relation of the marginal cost of conserved energy and the energy use for
    different quantities and qualities of the components.
    The optimal mix of solutions for the whole building is found by selecting building parts with the same cost of conserved energy.
    The constraint is that the total energy performance of the building is fulfilling the requirements. A case example shows how the
    method with success can find the solution for a typical single family house with the energy performance requirement for 2020.
    Original languageEnglish
    Title of host publicationProceedings of the 5th International Building Physics Conference
    Number of pages7
    Publication date2012
    Publication statusPublished - 2012
    Event5th International Building Physics Conference (IBPC 2012) - Kyoto, Japan
    Duration: 28 May 201231 May 2012
    Conference number: 5


    Conference5th International Building Physics Conference (IBPC 2012)
    Internet address


    • Economical optimization
    • Cost of conserved energy
    • Energy use
    • Energy performance requirement
    • Nearly zero energy buildings


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