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  2. Tempering (metallurgy) - Wikipedia

    en.wikipedia.org/wiki/Tempering_(metallurgy)

    Tempering (metallurgy) Differentially tempered steel. The various colors produced indicate the temperature the steel was heated to. Light straw indicates 204 °C (399 °F) and light blue indicates 337 °C (639 °F). [1][2] Tempering is a process of heat treating, which is used to increase the toughness of iron -based alloys.

  3. Plasma cutting - Wikipedia

    en.wikipedia.org/wiki/Plasma_cutting

    A specialized use of CNC plasma cutters has been in the heating, ventilating and air conditioning (HVAC) industry. Software processes information on ductwork and creates flat patterns to be cut on the cutting table by the plasma torch. This technology has enormously increased productivity within the industry since its introduction in the early ...

  4. Turning vanes (HVAC) - Wikipedia

    en.wikipedia.org/wiki/Turning_vanes_(HVAC)

    Turning vanes inside of large ductwork. Turning vane close-up. HVAC turning vanes are sheet metal devices inside of mechanical ductwork used to smoothly direct air inside a duct where there is a change in direction, by reducing resistance and turbulence.

  5. Differential heat treatment - Wikipedia

    en.wikipedia.org/wiki/Differential_heat_treatment

    Differential hardening is a method used in heat treating swords and knives to increase the hardness of the edge without making the whole blade brittle. To achieve this, the edge is cooled faster than the spine by adding a heat insulator to the spine before quenching. Clay or another material is used for insulation.

  6. Sheet Metal and Air Conditioning Contractors' National ...

    en.wikipedia.org/wiki/Sheet_Metal_and_Air...

    The Sheet Metal and Air Conditioning Contractors' National Association (SMACNA; pronounced 'Smack'-'Nah') is an international trade association with more than 4,500 contributing contractor members [1] in 103 chapters [2] throughout the United States, Canada, Australia and Brazil. Its headquarters is in Chantilly, Virginia.

  7. Vortex tube - Wikipedia

    en.wikipedia.org/wiki/Vortex_tube

    Separation of a compressed gas into a hot stream and a cold stream. The vortex tube, also known as the Ranque-Hilsch vortex tube, is a mechanical device that separates a compressed gas into hot and cold streams. The gas emerging from the hot end can reach temperatures of 200 °C (390 °F), and the gas emerging from the cold end can reach −50 ...

  8. Ground-coupled heat exchanger - Wikipedia

    en.wikipedia.org/wiki/Ground-coupled_heat_exchanger

    Ground-coupled heat exchanger. A qanat and windcatcher used as an earth duct, for both earth coupling and evaporative cooling. No fan is needed; the suction in the lee of the windtower draws the air up and out. A ground-coupled heat exchanger is an underground heat exchanger that can capture heat from and/or dissipate heat to the ground.

  9. Copper in heat exchangers - Wikipedia

    en.wikipedia.org/wiki/Copper_in_heat_exchangers

    Heat exchangers using copper and its alloys have evolved along with heat transfer technologies over the past several hundred years. Copper condenser tubes were first used in 1769 for steam engines. Initially, the tubes were made of unalloyed copper. By 1870, Muntz metal, a 60% Cu-40% Zn brass alloy, was used for condensers in seawater cooling.

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