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  2. Grate heater - Wikipedia

    en.wikipedia.org/wiki/Grate_heater

    However the unique environment of a fireplace and the burning of gas, wood, coal, pellets, etc., require specific heater designs and material construction making few, if any, grate heaters compatible with all fuels. The most critical elements of any tubular grate heater are: 1) Safety - construction material and method, design and features.

  3. Fireplace - Wikipedia

    en.wikipedia.org/wiki/Fireplace

    A grate (or fire grate) is a frame, usually of iron bars, to retain fuel for a fire. Heavy metal firebacks are sometimes used to capture and re-radiate heat, to protect the back of the fireplace, and as decoration. Fenders are low metal frames set in front of the fireplace to contain embers, soot and ash.

  4. Grate firing - Wikipedia

    en.wikipedia.org/wiki/Grate_firing

    Grate firing is a type of industrial combustion system used for solid fuels. It now is used mainly for burning waste and biomass, but also for smaller coal furnaces. Capacities 0.3 to 175 MWth in industry and CHP; Fuel fired per grate area 1-2 MW/m 2, maximum grate area 100 m 2

  5. Ogee - Wikipedia

    en.wikipedia.org/wiki/Ogee

    A building's surface detailing, inside and outside, often includes decorative moulding, and these often contain ogee-shaped profiles—consisting (from low to high) of a concave arc flowing into a convex arc, with vertical ends; if the lower curve is convex and higher one concave, this is known as a Roman ogee, although frequently the terms are used interchangeably and for a variety of other ...

  6. Diffraction grating - Wikipedia

    en.wikipedia.org/wiki/Diffraction_grating

    A blazed diffraction grating reflecting only the green portion of the spectrum from a room's fluorescent lighting. For a diffraction grating, the relationship between the grating spacing (i.e., the distance between adjacent grating grooves or slits), the angle of the wave (light) incidence to the grating, and the diffracted wave from the grating is known as the grating equation.

  7. Sand casting - Wikipedia

    en.wikipedia.org/wiki/Sand_casting

    There are five steps in this process: Place a pattern in sand to create a mold.; Incorporate the pattern and sand in a gating system. Remove the pattern. Fill the mold cavity with molten metal.

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