352
Section 5 Applying Technology: Producing Products and Structures
winter, the heat pump works in reverse.
The pump takes warmth from the outside
and brings it into the house. Heat pumps
can use air, water, or the ground as a heat
source. Those that use air work best in areas
that do not get very cold, such as the south-
ern and central United States. Groundwa-
ter heat pumps use well water as the heat
source. The water is pumped from the
well to the heat pump, has heat removed
or receives excess heat, and then returns to
the well. Ground-coil systems are buried in
the soil to take on or give off heat. Ground-
water and ground-coil systems can be used
in colder climates. Otherwise, heat pumps
need a small furnace or other auxiliary heat
source as a backup.
Communication systems
Most homes have communication
systems, such as telephone, radio, and
television, which require special wiring.
Telephone wiring and television cables are
liquid or air to collect solar heat. After the
heat is collected, the liquid or air is moved
to a storage device. Solar heating systems
are very effective in areas that have ample
sunshine.
Many buildings have cooling systems
to cool the air during the warm parts of
the year. Cooling systems use compressors,
evaporators, and condensers, very similar
to a refrigerator. The system has a fan that
draws the air from the room and passes it
over a cold evaporator. This is similar to a
forced-air furnace. Instead of the air being
heated, it is cooled before it is returned to
the room.
Another system used in climate control
is a unit called a heat pump. A heat pump
works as a cooling and heating system.
This pump can be operated in two direc-
tions. Operating in one direction, the heat
pump acts similar to an air conditioner.
The heat pump takes warmth from inside
the house and discharges it outside. In the
1. The fuel is used in
the furnace to
produce heat.
2. The conduction medium
(air or water) moves
the heat from the
furnace.
4. The conduction medium returns to the
furnace to be heated again.
3. Heat emitters give off
the heat from the
medium.
D Gas
D Electricity
D Wood
D Oil
Fuel
Furnace
Figure 17-21. Indirect heating systems heat a conduction medium. The resulting heat is
then put into the air in the room.
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352
Section 5 Applying Technology: Producing Products and Structures
winter, the heat pump works in reverse.
The pump takes warmth from the outside
and brings it into the house. Heat pumps
can use air, water, or the ground as a heat
source. Those that use air work best in areas
that do not get very cold, such as the south-
ern and central United States. Groundwa-
ter heat pumps use well water as the heat
source. The water is pumped from the
well to the heat pump, has heat removed
or receives excess heat, and then returns to
the well. Ground-coil systems are buried in
the soil to take on or give off heat. Ground-
water and ground-coil systems can be used
in colder climates. Otherwise, heat pumps
need a small furnace or other auxiliary heat
source as a backup.
Communication systems
Most homes have communication
systems, such as telephone, radio, and
television, which require special wiring.
Telephone wiring and television cables are
liquid or air to collect solar heat. After the
heat is collected, the liquid or air is moved
to a storage device. Solar heating systems
are very effective in areas that have ample
sunshine.
Many buildings have cooling systems
to cool the air during the warm parts of
the year. Cooling systems use compressors,
evaporators, and condensers, very similar
to a refrigerator. The system has a fan that
draws the air from the room and passes it
over a cold evaporator. This is similar to a
forced-air furnace. Instead of the air being
heated, it is cooled before it is returned to
the room.
Another system used in climate control
is a unit called a heat pump. A heat pump
works as a cooling and heating system.
This pump can be operated in two direc-
tions. Operating in one direction, the heat
pump acts similar to an air conditioner.
The heat pump takes warmth from inside
the house and discharges it outside. In the
1. The fuel is used in
the furnace to
produce heat.
2. The conduction medium
(air or water) moves
the heat from the
furnace.
4. The conduction medium returns to the
furnace to be heated again.
3. Heat emitters give off
the heat from the
medium.
D Gas
D Electricity
D Wood
D Oil
Fuel
Furnace
Figure 17-21. Indirect heating systems heat a conduction medium. The resulting heat is
then put into the air in the room.

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