OBJECTIVES To explore chimney sweeping work tasks, chimney sweeps' use of protective equipment, and type of fuel used by clients, over time. Further, to assess work-relatedness of current eye and airway symptoms. METHODS In a cross-sectional study in 2011, male Swedish chimney sweeps (n = 483; age 21-69 years) answered a questionnaire about their occupational history and eye and airway sympto...

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 ...

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...

Heat transfer process and fluid flow in a solar chimney used for natural ventilation are investigated numerically the present work. Solar was tested by selecting different positions of absorber namely: at back side, front middle air gap. CFD analysis based on finite volume method is to predict thermal performance, two dimensional under unsteady state condition, identify effect parameters such a...

Solar chimney power plants (SCPPs) are encouraging sustainable energy sources due to their low cost, abundance, maintenance, and eco-friendliness. However, despite significant efforts optimize SCPP design, efficiency generation capabilities remain limited. Researchers have explored modifications in plant geometry hybridization improve efficiency. Despite extensive work this area, commercializat...