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2. Acheson process - Wikipedia

   en.wikipedia.org/wiki/Acheson_process

   To finish the items, the process is run for approximately 20 hours at 200 V with a starting current of 300 A (60 kW) for a furnace approximately 9 meters long by 35 cm in width and 45 cm in depth, and the resistance drops as the carbon heats due to a negative temperature coefficient, causing the current to increase. [2] Cool down takes weeks.

3. Graphitization - Wikipedia

   en.wikipedia.org/wiki/Graphitization

   Graphitization generally occurs at high temperatures (up to 3,000 °C (5,430 °F)), and can be accelerated by catalysts such as iron or nickel. [ 2 ] When carbonaceous material is exposed to high temperatures for an extended period of time, the carbon atoms begin to rearrange and form layered crystal planes.

4. Process heat - Wikipedia

   en.wikipedia.org/wiki/Process_heat

   The required temperature of the process varies widely, with about half the industrial process heat having operating temperatures above 400 °C (752 °F). These higher-temperature processes can generally only be supplied by dedicated supplies like natural gas or coal, although pre-heating from other sources is also common in order to reduce fuel ...

5. Waterside hot water hay pellet furnace - Wikipedia

   en.wikipedia.org/wiki/Waterside_hot_water_hay...

   The temperature in the water chamber of the furnace can reach the boiling point within seven minutes, and at that rate, the furnace can burn off the majority of the ash and leave little waste. [4] Once development was complete on the furnace, the final working prototype of the waterside hay hot water pellet furnace was 45 inches tall and around ...

6. Rocket mass heater - Wikipedia

   en.wikipedia.org/wiki/Rocket_mass_heater

   A rocket mass heater (RMH), also known as rocket stove mass heater, is a form of slow-release radiant heating system, designed to primarily heat people and secondarily to warm areas in line of sight around it. Variations of RMH can also be extended for the functions of cooking, heating water, and producing warm air for distribution. [1]

7. New efficiency standards for home furnaces unveiled [Video] - AOL

   www.aol.com/news/biden-administration-unveils...

   (Canada has already required condensing furnaces for residential heating for over a decade.) Close-up of flames on a natural gas furnace burner in the HVAC system of a suburban home in San Ramon ...