Ch. 16 Sec. 3 Using Heat

Heating Systems Most homes & public buildings contain some kind of heating system. In the simplest and oldest heating system, wood or coal is burned in a stove.

Forced-Air Systems Use fans to circulate warm air: Convection Filtered and cleaned as it passes through out the system

Radiator Systems A radiator is a closed metal container that contains hot water or steam. The thermal energy contained in the hot water or steam is transferred to the air surrounding the radiator by conduction. This warm air then moves through the room by convection.

Electric Systems An electric heating system has no central furnace – Space heater Instead, electrically heated coils placed in floors and in walls heat the surrounding air by conduction. Heat is then distributed through the room by convection.

Solar Heating Systems Passive Solar Heating Absorb radiant energy from Sun. Active Solar Heating use solar collectors that absorb radiant energy from the Sun.

Heat Engines A device that converts heat into work is a heat engine. A car’s engine converts the chemical energy in gasoline into heat. The engine then transforms some of the thermal energy into work by rotating the car’s wheels.

Internal Combustion Engines Four-stroke cycle engine Intake Stroke Compression Stroke Power Stroke Exhaust Stroke

Heat Movers Device that removes thermal energy from one place and transfers it to another place at a different temp. Ex. Refrigerator, air conditioners, de- humidifiers, heat pumps.