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Forced-air gas
Forced-air gas heating systems are used in central air heating/cooling systems for houses. Sometimes the system is referred to as "Forced hot air".
==Design==
Generally, they have a furnace heated by natural gas that pushes hot air through duct-work, then through vents to heat a building. Depending on the age of the system, forced air gas furnaces utilize either a pilot light or a solid state ignition system (spark or hot surface ignition) to light the natural gas burner.〔(【引用サイトリンク】url=http://gasfurnaceguide.com/2010/how-to-light-a-furnace-pilot-light/ )〕 A climate-control device (e.g., thermostat) regulates and controls the usage of the furnace. A digital thermostat can be programmed to activate the gas furnace at certain times. For example, a resident may want the temperature in their dwelling to rise 15 minutes before returning from work. This will conserve energy, expenses and natural resources. The natural gas is fed to buildings from a main gas line submerged a few feet beneath the earth, most likely running under and parallel to a street. The duct work supplying the hot air (and sometimes cool air if an AC unit tied into the system) can be insulated, or not insulated.
Simple types of gas-fired furnace lose significant amounts of energy in the hot waste gases going up the chimney. Modern high-efficiency condensing furnaces condense the water vapor emitted as one of the products of consumption. This increases the efficiency (energy delivered into the building vs. heating value of gas purchased) to over 90%. An incidental beneficial effect is that the waste gas stack is much smaller and can be made of plastic pipe; since the waste pipe is cooler than the chimney of a non-condensing furnace, it can be easily routed through walls or floors. However, the condensing furnace is more expensive initially because of the extra induced draft fn and condensate pump required, and the extra heat exchanger in the firebox.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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