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2. Air source heat pump - Wikipedia

   en.wikipedia.org/wiki/Air_source_heat_pump

   An internal view of the outdoor unit of an air source heat pump A: indoor compartment, B: outdoor compartment, I: insulation, 1: condenser, 2: expansion valve, 3: evaporator, 4: compressor. Heating and cooling is accomplished by pumping a refrigerant through the heat pump's indoor and outdoor coils.

3. Roller hearth furnace - Wikipedia

   en.wikipedia.org/wiki/Roller_hearth_furnace

   Roller hearth furnaces are built with two openings opposite each other to allow items to pass into, through and out of the furnace while moving in one direction. Depending on their application and operating temperature they may contain either a conveyor belt or furnace rollers for the movement of items through the furnace.

4. Furnace (central heating) - Wikipedia

   en.wikipedia.org/wiki/Furnace_(central_heating)

   Furnaces are mostly used as a major component of a central heating system. Furnaces are permanently installed to provide heat to an interior space through intermediary fluid movement, which may be air, steam, or hot water. Heating appliances that use steam or hot water as the fluid are normally referred to as a residential steam boilers or ...

5. Open-hearth furnace - Wikipedia

   en.wikipedia.org/wiki/Open-hearth_furnace

   Open hearth furnace workers at the Zaporizhstal steel mill in Ukraine taking a steel sample, c. 2012 Tapping open-hearth furnace, VEB Rohrkombinat Riesa, East Germany, 1982. An open-hearth furnace or open hearth furnace is any of several kinds of industrial furnace in which excess carbon and other impurities are burnt out of pig iron to produce ...

6. Electric heating - Wikipedia

   en.wikipedia.org/wiki/Electric_heating

   Electric heating devices can be built in any required size and can be located anywhere within a plant. Electric heating processes are generally clean, quiet, and do not emit much byproduct heat to the surroundings. Electrical heating equipment has a high speed of response, lending it to rapid-cycling mass-production equipment.

7. Vacuum furnace - Wikipedia

   en.wikipedia.org/wiki/Vacuum_furnace

   Operating a vacuum heat treating furnace, c. 1959–1962. A vacuum furnace is a type of furnace in which the product in the furnace is surrounded by a vacuum during processing. The absence of air or other gases prevents oxidation, heat loss from the product through convection, and removes a source of contamination.