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All-in-one design tool solution for passive houses and buildings

Monthly energy balance and hygrothermal simulation
: Antretter, F.; Klingenberg, K.; Pazold, M.

Oak Ridge National Laboratory -ORNL-, Oak Ridge/Tenn.; American Society of Heating, Refrigerating and Air-Conditioning Engineers -ASHRAE-, Atlanta/Ga.:
Thermal Performance of the Exterior Envelopes of Whole Buildings XII International Conference : Clearwater, Florida, USA, 1-5 December 2013
Red Hook, NY: Curran, 2013
ISBN: 978-1-5108-2783-7
International Conference on Thermal Performance of the Exterior Envelopes of Whole Buildings <12, 2013, Clearwater/Fla.>
Conference Paper
Fraunhofer IBP ()

The U.S. Department of Energy (DOE) outlined a path to advance high-performance and zero-energy homes in its Building America research program (DOE 2008). That program - and other efforts in the Unites States over the last few years to tighten energy codes - follow closely the evolution of energy standard developments in Europe. That is, developmentsmoved fromconventional buildings to low-energy buildings, then to passive buildings, net zero, and recently even plus energy. The common denominator is low-load homes that require less energy fromthe start. Designing these homes requires specialized design tools to achieve targeted performance and quality assurance. The tools must enable the designer to meet the energy performance of the envelope and the minimizedmechanical system and - critically - to achieve proper hygrothermal design of building skins before the detailed construction documents phase. The hygrothermal component reduces the risk of potentially catastrophic design flaws, thereby reducing risk for designers, builders, and homeowners. The passive design approach offers a solid baseline for all low-load homes. The simplified static balance-based method has provided early adopters a useful tool. But it lacks the capacity to assess certain dynamic factors of the energy balance, such as transient effects that occur under real conditions - for example, thermal lag time and related overheating in summer or the hygrothermal performance of the building envelope. This paper outlines the incorporation of the balance-based method currently employed to design passive buildings into hygrothermal whole-building simulation software.A case study illustrates both methods as they are applied to an actual building. Additional results and insights from the dynamic building simulation are highlighted.