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Home Cooling. EGEE 102. Function of an Air conditioner. Humidity in air. Relative Humidity A measure of of much water is in the air relative to the maximum amount air can hol at that tmperature. http://www.ae.iastate.edu/Ast473/Lectures/%285%29Psychrometric_Chart/sld024.htm. Principle.

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Home cooling

Home Cooling

EGEE 102

Function of an air conditioner
Function of an Air conditioner

EGEE 102 - Pisupati

Humidity in air
Humidity in air

Relative Humidity

A measure of of much water is in the air relative to the maximum amount air can hol at that tmperature

EGEE 102 - Pisupati

EGEE 102 - Pisupati



  • Expansion Valve

  • Compressor

EGEE 102 - Pisupati


EGEE 102 - Pisupati

Types of air conditioners

  • Room air conditioners

  • Central air conditioning systems

  • Heat pumps

  • Evaporative coolers

EGEE 102 - Pisupati

Air conditioning
Air Conditioning

EGEE 102 - Pisupati

Room air conditioner
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

EGEE 102 - Pisupati

Central air conditioning
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

EGEE 102 - Pisupati

Types of central ac
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

EGEE 102 - Pisupati

Large air conditioning systems
Large air conditioning systems

  • Outside air is drawn in, filtered and heated before it passes through the main air conditioning devices. The colored lines in the lower part of the diagram show the changes of temperature and of water vapor concentration (not RH) as the air flows through the system.

EGEE 102 - Pisupati

Total air conditioning
Total Air Conditioning

EGEE 102 - Pisupati

EGEE 102 - Pisupati

Sizing air conditioners
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

EGEE 102 - Pisupati

Energy consumption
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.

EGEE 102 - Pisupati

Energy efficiency
Energy Efficiency

  • Today's best air conditioners use 30% to 50% less energy than 1970s

  • Even if your air conditioner is only 10 years old, you may save 20% to 40% of your cooling energy costs by replacing it with a newer, more efficient model

EGEE 102 - Pisupati

Energy efficiency1
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

EGEE 102 - Pisupati

Room air conditioners
Room Air Conditioners

  • Built after January 1, 1990, need have an EER of 8.0 or greater

    • EER of at least 9.0 if you live in a mild climate

    • EER over 10 for warmer climates

EGEE 102 - Pisupati

Central ac
Central AC

  • National minimum standards for central air conditioners require a SEER of

    • 9.7 for single-package and

    • 10.0 for split-systems

    • Units are available with SEERs reaching nearly 17

EGEE 102 - Pisupati

Energy saving methods
Energy Saving Methods

  • Locate the air conditioner in a window or wall area near the center of the room and on the shadiest side of the house.

  • Minimize air leakage by fitting the room air conditioner snugly into its opening and sealing gaps with a foam weather stripping material.

EGEE 102 - Pisupati

Numerical problem
Numerical Problem

  • A EER from 5.0 to 9 saving and pay back period

EGEE 102 - Pisupati