operating systems of the home
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OPERATING SYSTEMS OF THE HOME. A well-planned electrical system can prevent overloading of circuits, loss of power, and even electrical fires. There are numerous components of an electrical system: . Electrical systems. - PowerPoint PPT PresentationTRANSCRIPT
CIRCUIT – A path through which electricity flows from a source to the outlets and back to the source
A well-planned electrical system can prevent overloading of
circuits, loss of power, and even electrical fires. There are
numerous components of an electrical system:
AMPERE – A unit of current used to measure the amount of electricity flowing through a wire during a specific amount of time
CIRCUIT BREAKER – A device that opens (turns off or “trips”) and closes (turns on) a circuit; it opens automatically when a circuit is overloaded
CONVENIENCE OUTLET – A device attached to a circuit that allows appliances or lighting to draw off electricity from a circuit
CONDUCTOR – Any material which permits the flow of electricity; usually a wire
FUSE – A safety device that was a forerunner to the circuit
breaker; it opens automatically when a circuit is overloaded by
melting a link its chamber
SERVICE ENTRANCE PANEL – The main distribution box that receives the electricity as it
comes into the house and distributes it to various points throughout the home; it contains
the main disconnect switch and the fuses or circuit breakers
VOLTAGE – A measure of the pressure which forces the electrical current through a wire
WATT – A measure of electrical power; the number of amperes in a circuit
multiplied by the number of volts = the number of watts the circuit provides
Expanding an electrical system is expensive and time- consuming, so care should be taken to account for present
and future needs during initial
planning.
Electrical engineers, draftsman, and certified
electricians draw and follow detailed electrical diagrams.
This is a duplex receptacle that
accommodates a two-prong plug plus a
grounding terminal for three-prong plugs. This type of outlet
provides 110/120V of electricity for nearly all
uses in the home.
The GFCI (ground-fault circuit interrupter) receptacle
has “test” and/or “reset” buttons. It protects against electric shock if there is a short in an appliance. It is
especially important to use these outlets in areas near water sources, such as by
the bathroom vanity or pool.
Some appliances require 220/240V of electricity. These are usually large
heat-producing appliances such as kitchen ranges and
clothes dryers, or some window air-conditioners.
These receptacles are usually larger in size
with openings specifically arranged for
three-pronged plugs.
There are three primary parts to
a residential plumbing system:
1. The water supply system
2. The wastewater removal system
3. The plumbing fixtures
Building mainCold water lines are routed through the house, or to the hot water heater; they may to a water treatment system here first
The residential water supply begins at a city water main or at a private well. The pipe leading from one of those sources then enters the house under pressure via a building main .
A shutoff valve controls the water entering the house. From there it
branches off, but may be routed through a treatment system such as a water
softener or water filter first.
Some cold water is routed throughout the house, while some is
sent to a hot water heater before it is
circulated. Shut off valves near fixtures or branch lines allow you to shut off sections of plumbing instead of the entire system.
THE WATER SUPPLY SYSTEM
THE WASTEWATER REMOVAL SYSTEM
Wastewater is carried down the drains and to a sanitary sewer or
private septic tank.
The wastewater system is not pressurized, but depends on
gravity for drainage.
Waste water contains harmful gases. The loop in a pipe under a sink (called a trap) holds water in
it to prevent the gases from entering the house. Then
ventilation systems called soil stacks extend from inside the
house to an opening above the roofline to allow the gases to
vent out.
THE PLUMBING FIXTURES
A plumbing fixture is any appliance that is connected to the plumbing system, such
as a shower stall, bathtub, sink, dishwasher, or toilet.
When selecting plumbing fixtures you should consider style, size, fixture material, floor or wall support for the fixture, and the water supply
and drain requirements.
A total climate control system involves temperature control,
humidity control, air circulation, and air cleaning. FIREPLACES
The firebox actually contains the fire, and must be a fire-
proof substance. At the top of the firebox is the damper,
which controls the burn rate and prevents downdrafts of cold air. The flue carries
smoke to the outside of the house and facilitates a draft. The draft draws in sufficient oxygen for the fire to burn.
Safety from sparks is a major concern with some fireplaces.
A fireplace might burn wood, which requires a wood supply, wood storage, and ash removal. Instead, it could be electric or gas-fired to resemble a wood fire, and might be controlled by a wall switch or remote control. In general, a fireplace consists of a firebox, damper, and flue. A fireplace can provide a
certain ambiance or warmth or both.
STOVESStoves generally provide more efficient heat than fireplaces, and are usually
fueled by either wood or coal.
If you stand close to the stove you can feel the radiant heat from the hot exterior surface. With the addition of a fan, airflow is improved and circulates the heated air
throughout the room or house.
CONVENTIONAL HEATING SYSTEMSA FORCED WARM-AIR SYSTEM uses a furnace and electricity or gas (natural
gas or liquid propane) to heat the air, a blower to bring cold air into the furnace and push heated air out, and a system of ductwork to distribute the
air throughout the home. A thermostat is used to set the desired temperature, and the furnace responds in heating cycles.
A HYDRONIC SYSTEM uses hot water to heat a home. Water is heated in a boiler by gas, fuel oil, wood, coal, or electricity. The hot water is pumped through pipes in floors or leading to radiators within
the living space. As the water cools, it is recirculated.
ELECTRIC RADIANT SYSTEMS use resistance wiring to produce heat in the
wire. The wires are embedded in the ceiling or floor or mounted in baseboard
convectors.
CENTRAL HEAT PUMP SYSTEMS use a refrigeration unit consisting of a compressor, a refrigerant fluid, and heat exchangers. In cold weather, the heat
is removed from outside air and pumped into the house.
SOLAR HEATING SYSTEMSPASSIVE SOLAR HEATING SYSTEMS uses glass and concrete in the structure of the house to collect and contain heat without
an air distribution system.
ACTIVE SOLAR HEATING SYSTEMS use special solar collectors to absorb heat and send it to a collection area filled with water
or stones. Distribution of heat from the collection area is accomplished with
forced air or a water pump.
COOLING SYSTEMS
CENTRAL HEAT PUMP SYSTEMS use a refrigeration unit consisting of a compressor, a refrigerant fluid, and heat exchangers. In warm weather,
heat is removed from in the house and pumped outside.
COMPRESSOR-CYCLE SYSTEMS use a highly compressed chemical refrigerant to cool air. It uses a
compressor/condenser unit located outside the home. This system is used in conjunction with a
furnace, using the blower to circulate the cooled air throughout the house. As the air is cooled, moisture condenses and is drained away… dehumidifying the
air and increasing the level of comfort.
WINDOW AIR CONDITIONERS are not cooling systems, but do provide local cooling. It is more
expensive and less efficient than central air systems. The compressor, condenser, cooling
coil, and fan are all in one unit. They are installed directly in a window to draw in air. They plug in, and operate on 120V or 240V.
The purpose of insulation in a structure is to prevent excessive heat loss in cold weather and
excessive heat gain in warm weather. The insulation material resists the flow of heat
through it.Common insulation materials
include fiberglass, foamed glass, foamed plastics, and expanded minerals such as vermiculite.
An insulation’s level of resistance to heat is designated as it’s R-value. The higher the R-Value, the better the insulating qualities. Different
areas of your home need different levels of insulation. Recommendations for midwest housing are: Attic: R-38 to R-44,
Sidewalls: R-11 to R-18, Basement: R-10 to R-19 ,Crawlspace: R-19
Low humidity in the home can cause throat and skin irritation and cracks in wooden
furniture. When air is dry, static electricity also builds up. A humidifier, a free-
standing unit or one attached to a forced-air furnace, can add moisture to the air.
Humidity is the amount of moisture in the air.
High humidity in the home feels sticky and uncomfortable. It
can even cause wooden doors, windows, and drawers to swell
and stick.
Excess humidity in the home, caused by leaks or improper ventilation, can encourage the growth of mold. It can smell bad and deteriorate air quality. It can even cause toxic black mold, which has been linked to memory loss and
breathing problems.
Condensation may occur as well, causing wood to warp. A dehumidifier, often a portable unit, removes evaporated water from the air by condensing it on cold coils. The accumulated water would need to be drained away or
emptied periodically.
Warm air rises and cold air falls, so a fan to circulate the air can
moderate temperatures. A
ceiling fan can blow air down, or in
reverse… it can draw air up.
Good air circulation can prevent air in the home from becoming stale, and can add to comfort
levels.
A circulation system on a central heating system brings in fresh air from the outside. It and attic
fans help with air circulation as well.
Any type of fan can move the air and help eliminate areas with high concentrations of
moisture, smoke, or fumes.
An air cleaning device removes dust and foreign materials from the air, improving air quality and
possibly diminishing some allergies.
Built-in filters on furnaces or
electronic air cleaning grids remove dust
particles, smoke, odors, and pet
dander from the air. A grid works by
placing an electronic charge on each
airborne contaminant and attaching these
particles to a metal plate. The
accumulated dust and dirt is removed
when the filter is changed or cleaned.
Carbon monoxide is a poisonous gas that is produced by the incomplete burning of fossil fuels such as natural gas, propane, coal, oil, charcoal, and wood. This gas is colorless, tasteless, and odorless. It can cause headaches, nausea, and
dizziness in low levels or unconsciousness, brain damage, or death at high levels. A carbon monoxide
detector sounds an alarm as gas levels approach unacceptable levels.
Smoke detectors should be placed on each level of the
house, or even outside each bedroom. They are powered by batteries or by household
current with a battery backup. They detect the
presence of smoke particles present during a fire,
sounding an alarm to alert residents.
Radon is an invisible, odorless, radioactive gas. Radon is in soil,
ground water, and building materials. High levels may increase the
risk of lung cancer. Good ventilation and air circulation can prevent
these high levels.
Security: perimeter entry, glass breakage, smoke/heat detection, and motion sensing
High water detection, temperature monitoring, and power loss
Notification when children arrive home from school
Control lighting and other devices remotely from any telephone
Supervise children's play areas, the front door, the pool, or other areas
Remote home surveillance & monitoring from any computer
Room-to-room intercom and door intercom Entry access and keyless entry
Driveway vehicle alert Automatically alerts law officials (monthly
service fee required)
Components such as keypads, sensors, cameras, computers, and telephones can be used to set up a home security system.
“Energy” costs money and is a limited resource, so care should be taken to conserve it. The U.S. Department of Energy
estimates that the average home uses energy as
follows:
44% for heating and cooling
33% for lighting, cooking, and appliances
14% for water heating 9 % for the
refrigerator
Use weather stripping and caulk/foam to seal cracks around windows, doors, walls, and floors.
Change air filters in the heating and cooling systems of your home once a month or as
needed.
Replace older appliances with new, more energy efficient models.
Replace regular incandescent light bulbs with newer more efficient light bulbs.
Set your hot water heater at the “normal” 120 degree F setting.
Use cold water for washing clothes whenever possible.
Run clothes and dishwashers with full loads.
Adjust or program your thermostat, raising it in the summer and lowering it in the winter when
you’re not home.
Use shades, overhangs, awnings, trees, curtains, or blinds to block the sun and keep
your home cool in warm weather.
Put your computer in “hibernate” mode when not in use for 10 minutes or more.
Install storm windows and doors as needed.
Keep the fireplace damper closed unless a fire is going.
Scrape but don’t rinse dishes before putting them in the dishwasher. Avoid using the
rinse/hold feature unless necessary. Run the dishwasher full, but not overloaded. Let the
dishes air dry.
Keep the clothes dryer vent clean. Dry heavy items separately from lightweight items. Use
the moisture sensor instead of the timed cycle if it’s available.
Turn off lights when not in use. Take advantage of daylight by using light-
emitting window treatments.
Landline telephones, television, and computer communications require pre-wiring in homes.
This interior wiring branches out from a network interface device on the outside of the home.
Use care in planning this wiring. Updates are expensive and time consuming, and exposed
wiring may be visible on the outside of the home. Plan for present and future needs.
• Preparing individuals for life and work• Strengthening families
• Empowering communities
Created by Barbara L. Swarthout, Family & Consumer Sciences teacher at Elkhorn High School