A cooling system, consisting of a chimney and a radial heat sink, was developed for a light-emitting diode (LED) downlight to replace a conventional light for saving energy. Natural convection was simulated with a numerical model that was verified experimentally. When the chimney was installed around the radial heat sink, the cooling efficiency of the heat sink was improved because the cooling ...

PURPOSE To present a technique for transfemoral implantation of parallel grafts into the renal arteries in patients with anatomy or morphology that blocks standard antegrade chimney graft delivery. TECHNIQUE In a totally percutaneous approach, a 5-F pigtail angiographic catheter is passed into the aorta above the renal arteries via a 0.035-inch hydrophilic guidewire, followed by an 8-F sheath...

Deep-sea hydrothermal vent chimneys contain a high diversity of microorganisms, yet the metabolic activity and the ecological functions of the microbial communities remain largely unexplored. In this study, a metagenomic approach was applied to characterize the metabolic potential in a Guaymas hydrothermal vent chimney and to conduct comparative genomic analysis among a variety of environments ...

The potential for application of GIScience techniques and technologies is increasingly being realized by a multitude of diverse domains. This paper reports on one such application in the domain of building diagnostics, a subfield of the broader economic sector of building construction. A pressing issue in building diagnostics is the detection of water infiltration, a condition that can cause si...

In this study, a numerical model was presented to simulate the experimental behavior obtained for a reinforced concrete chimney section. The purpose of the previous experimental investigation conducted for the chimney section was to evaluate the effect of large openings on the cyclic response in order to reveal the performance of such structures under seismic loads. A detailed finite element mo...

In 2011, Skrugard discovery made an explorational breakthrough in the south-western Barents Sea. Earlier this year, Havis discovery (well 7220/7-1) was found in the same area. Both two discoveries are found in the same production license. The double flat spots were found in both Skrugard and Harvis discoveries. However, there are many dry wells in the same area before these two discoveries. The...

Preliminary note This paper deals with the numerical analysis procedure and results of flow simulation through solar chimney. Because of relatively low Reynolds numbers, some aerodynamic improvements could be obtained. The paper links input heat energy with geometry or air flow parameters. Basic solar chimney geometry is carried out and analyzed with CFD application in three dimensional domain....

This work presents an overview of (passive) solar chimney research, from the natural convection fundamentals to recent progress for achieving thermohydraulic best-performance. Solar chimneys are attractive because they contribute increasing efficiency in air conditioning processes dwellings and buildings, therefore also aid reduction greenhouse gas emissions. A wide number works dealing with (a...

The present work involves a new and novel upgrading design to the classical solar chimney power plant (SCPP) structure. SCPP was modified by adding co-centric secondary external structure enhance energy production. In improved design, named double-chimney (SDCPP), internal chimney, operates like traditional produce electricity during daytime whereas as 10 cooling towers (CT) in series. Each CT ...