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Roberts-Gordon LLC was also the first company to patent fully modulating infrared systems with an ULTRAVAC control, a control that allowed building owners to modulate burner input rate with outdoor air temperature in order to match the heating system’s input to the building’s heating requirement.
Many tankless units have fully modulating gas valves that range from as low as 10,000 to over 1,000,000 BTUs. [clarification needed] Most electrical tankless heaters require AWG 10 or 8 wire, corresponding to 5.5 or 8.5 mm 2 for typical POU (point of use) heaters at North American voltages. Larger whole-house electric units may require up to ...
These furnaces were still big and bulky compared to modern furnaces, and had heavy-steel exteriors with bolt-on removable panels. Energy efficiency would range anywhere from just over 50% to upward of 65% AFUE. This style furnace still used large, masonry or brick chimneys for flues and was eventually designed to accommodate air-conditioning ...
Almost all have modulating burners. These allow the power to be reduced to match the demand. Boilers have a turndown ratio which is the ratio of the maximum power output to the minimum power output for which combustion can be maintained. If the control system determines that the demand falls below the minimum power output, then the boiler will ...
An industrial furnace, also known as a direct heater or a direct fired heater, is a device used to provide heat for an industrial process, typically higher than 400 degrees Celsius. [1] They are used to provide heat for a process or can serve as reactor which provides heats of reaction.
An electric arc furnace (EAF) is a furnace that heats material by means of an electric arc. Industrial arc furnaces range in size from small units of approximately one-tonne capacity (used in foundries for producing cast iron products) up to about 400-tonne units used for secondary steelmaking.