26-06-2012, 03:22 PM
Home Cooling
Home Cooling.ppt (Size: 836.5 KB / Downloads: 334)
TYPES OF AIR CONDITIONERS
Room air conditioners
Central air conditioning systems
Heat pumps
Evaporative coolers
Room air conditioner
Room air conditioners cool rooms rather than the entire home.
Less expensive to operate than central units
Their efficiency is generally lower than that of central air conditioners.
Can be plugged into any 15- or 20-amp, 115-volt household circuit that is not shared with any other major appliances
Central Air conditioning
Circulate cool air through a system of supply and return ducts. Supply ducts and registers (i.e., openings in the walls, floors, or ceilings covered by grills) carry cooled air from the air conditioner to the home.
This cooled air becomes warmer as it circulates through the home; then it flows back to the central air conditioner through return ducts and registers
Sizing Air Conditioners
how large your home is and how many windows it has;
how much shade is on your home's windows, walls, and roof;
how much insulation is in your home's ceiling and walls;
how much air leaks into your home from the outside; and
how much heat the occupants and appliances in your home generate
Energy Consumption
Air conditioners are rated by the number of British Thermal Units (Btu) of heat they can remove per hour. Another common rating term for air conditioning size is the "ton," which is 12,000 Btu per hour.
Room air conditioners range from 5,500 Btu per hour to 14,000 Btu per hour.