A lack of rigorous design methods and comprehensive performance data has slowed U.S. acceptance of natural ventilation technology, which proponents argue can increase energy efficiency in commercial buildings as well as improve indoor environmental conditions. The National Institute of Standards and Technology’s (NIST) new LoopDA 1.0 software program (for Loop Design and Analysis) helps fill this critical information gap.
The LoopDA simulation tool enables building designers and engineers to determine the size of natural ventilation openings needed to provide desired airflow rates. Previously, building designers have had to make decisions using trial and error or based on past experiences. Although LoopDA 1.0 provides “first-cut” estimates rather than final results, it is a great improvement over the former “more art than science” approach, according to NIST developer Stuart Dols.
As described at a recent technical conference in the Netherlands* LoopDA allows users of the computer program to sketch rooms and vertical sections of a building, the location of natural ventilation openings (e.g., windows, doors and ducts) and the paths the air should take through the building (i.e., pressure loops). The program then enables designers to determine the size of the natural ventilation openings needed to control indoor air quality and thermal comfort using an engineering-based design process.
John Blair | NIST
18.08.2017 | Albert-Ludwigs-Universität Freiburg im Breisgau
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18.08.2017 | Washington University in St. Louis
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A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.
Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...
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