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Zijun Li, Qian Jia, Gang Li, Yu Xu, Junjian Wang and Xiaowei Zhai
A high temperature is the key factor limiting the safe development of deep mine tunnels. By confronting the phenomenon of serious heat exchange between airflow and the surrounding rocks in the tunnel excavation area, a conceptual model of coupled cooling...
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Erik Nilsson, Sylvain Ménard, Delphine Bard Hagberg and Nikolaos-Georgios Vardaxis
Sound reduction is complex to estimate for acoustical treatments on ventilation ducts through walls. Various acoustical treatments are available for ventilation ducts, including internal lining (absorption along the inner perimeter), external lagging (ex...
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Weidong Guo, Lei Chen, Guoqiang Liu, Juntao Wang, Shaoshuai Shi and Lin Bu
There are many issues affecting multi-hole parallel tunneling and long tunnel ventilation, such as insufficient fresh air supplied at the tunnel face, pollution by contaminated winds, and uncoordinated work among multiple fans. In view of these issues, t...
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Ladislav Illes, Martin Jurkovic, Tomas Kalina, Jarmila Sosedova, Piotr Gorzelanczyk, Ondrej Stopka and Tibor Kubjatko
Limited navigation depth, especially on inland waterways, is one of the main limiting factors that shorten the navigation period. Distributed propulsion systems represent an opportunity to increase the navigability of ships across critical sections of wa...
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Shuai Yang, Rui Ren and Ya-Qiong Wang
In tunnel construction, the difficulty of ventilation gradually increases with the increase of ventilation distance, which endangers construction safety and delays construction progress. This paper presents an air cabin ventilation system of the tunnel d...
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Nabil Nassif, Mostafa Tahmasebi, Iffat Ridwana and Pejman Ebrahimi
Buildings account for a large portion of the total energy use in the US; therefore, improving the operation of typical variable-air-volume (VAV) systems in buildings can provide a tremendous economic opportunity. ASHRAE Guideline 36 recommends a resettin...
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Erik Nilsson, Nikolaos-Georgios Vardaxis, Sylvain Ménard and Delphine Bard Hagberg
Ventilation ducts can have a negative effect on the sound reduction index between two rooms if they pass through the dividing structure without treatments. The overall sound reduction of a ventilation duct is dependent on several factors including the tr...
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Rand Talib and Nabil Nassif
According to EIA, the Heating Ventilation and Air Conditioning (HAVC) systems account for about 25% of the U.S.?s total commercial building?s energy use. Therefore, advanced modeling and optimization methods of the system components and operation offer g...
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