19-12-2012, 06:54 PM
Home Cooling
1Home Cooling.ppt (Size: 836.5 KB / Downloads: 326)
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
Types of Central AC
split-system
an outdoor metal cabinet contains the condenser and compressor, and an indoor cabinet contains the evaporator
Packaged
the evaporator, condenser, and compressor are all located in one cabinet
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 Efficiency
Rating is based on how many Btu per hour are removed for each watt of power it draws
For room air conditioners, this efficiency rating is the Energy Efficiency Ratio, or EER
For central air conditioners, it is the Seasonal Energy Efficiency Ratio, or SEER