Final answer:
The Forced-air heating system utilizes convection to transfer heat from the burning fuel through a heat exchanger, which heats the air, and then distributes it throughout a house via a blower and ductwork.
Step-by-step explanation:
The heating system that uses convection from burning fuel to warm a heat exchanger, which in turn heats the air in the ductwork before being circulated through a house, is the Forced-air heating system. This system relies on a blower to force the warm air through the ducts. In contrast, radiant heating involves the direct transfer of heat to objects and people in the room, baseboard heating generally uses convection but relies on individual units situated around the perimeter of rooms, and geothermal heating utilizes the stable temperature of the earth to provide heating and cooling.
Convection is the heat transfer by the macroscopic movement of a fluid, such as air or water. In the context of household heating, a forced-air furnace draws in cool air, heats it by passing it over a heat exchanger, and then a blower pushes the heated air through the ductwork of a house. This process exemplifies convection as described in Figure 33.22 and is elaborated in the everyday examples of forced-air furnaces and weather systems.