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2. Furnace (central heating) - Wikipedia

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

   The fourth category of furnace is the high-efficiency condensing gas furnace. High efficiency condensing gas furnaces typically achieve between 90% and 98% AFUE. [3] A condensing gas furnace includes a sealed combustion area, combustion draft inducer and a secondary heat exchanger. The primary gain in efficiency for a condensing gas furnace, as ...

3. Forced-air gas - Wikipedia

   en.wikipedia.org/wiki/Forced-air_gas

   Older furnaces sometimes relied on gravity instead of a blower to circulate air. [1]Gas-fired forced-air furnaces have a burner in the furnace fueled by natural gas.A blower forces cold air through a heat exchanger and then through duct-work that distributes the hot air through the building. [2]

4. Annual fuel utilization efficiency - Wikipedia

   en.wikipedia.org/wiki/Annual_fuel_utilization...

   The annual fuel utilization efficiency (AFUE; pronounced 'A'-'Few' or 'A'-'F'-'U'-'E') is a thermal efficiency measure of space-heating furnaces and boilers.The AFUE differs from the true 'thermal efficiency' in that it is not a steady-state, peak measure of conversion efficiency, but instead attempts to represent the actual, season-long, average efficiency of that piece of equipment ...

5. Industrial furnace - Wikipedia

   en.wikipedia.org/wiki/Industrial_furnace

   The residual heat will exit the furnace as flue gas. [1] These are designed as per international codes and standards the most common of which are ISO 13705 (Petroleum and natural gas industries — Fired heaters for general refinery service) / American Petroleum Institute (API) Standard 560 (Fired Heater for General Refinery Service).

6. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   However, if a building does need full heating, combustion central heating may offer a more environmentally friendly solution than electric resistance heating. This applies when electricity originates from a fossil fuel power station , with up to 60% of the energy in the fuel lost (unless utilized for district heating ) and about 6% in ...

7. Forced-air - Wikipedia

   en.wikipedia.org/wiki/Forced-air

   Requires less energy than electric resistance heating and possibly more efficient than fossil fuel fired furnaces (gas/oil/coal). Air source types may not be suitable for cold climates unless used with backup (secondary) source of heat. Newer models may still provide heat when coping with temperatures below 0 °C (32 °F).

8. Heat-transfer fluid - Wikipedia

   en.wikipedia.org/wiki/Heat-transfer_fluid

   Heat Capacity: A fluid’s heat capacity indicates how much thermal energy it can transport and store, impacting the efficiency of the heat transfer process. [ 2 ] Thermal Conductivity and Thermal Diffusivity : These properties influence the rate at which heat is transferred through the fluid, affecting how quickly a system can respond to ...

9. Staged combustion - Wikipedia

   en.wikipedia.org/wiki/Staged_combustion

   This technique is currently used in 116 pulverized coal-fired units on a total capacity of 50 gigawatt electrical (GW e) as a standalone measure. It is used in combination with other primary measures for NO x control in 175 coal-fired units on a total capacity of 53 GW e. [3] Via air staged supply, a NO x reduction rate from 50-75% is possible ...