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Function of an Air conditioner

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. Expansion Valve Compressor.

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Function of an Air conditioner

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  1. Function of an Air conditioner

  2. 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

  3. http://www.ae.iastate.edu/Ast473/Lectures/%285%29Psychrometric_Chart/sld024.htmhttp://www.ae.iastate.edu/Ast473/Lectures/%285%29Psychrometric_Chart/sld024.htm

  4. Principle • Expansion Valve • Compressor

  5. Arrangement

  6. TYPES OF AIR CONDITIONERS • Room air conditioners • Central air conditioning systems • Heat pumps • Evaporative coolers

  7. Air Conditioning

  8. 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

  9. 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

  10. 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

  11. 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.

  12. Total Air Conditioning

  13. Variable fresh air mixer and dust and pollutant filtration. • Supplementary heating with radiators in the outer rooms and individual mini heater and • Humidifier in the air stream to each room.

  14. 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

  15. 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.

  16. 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

  17. 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

  18. 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

  19. 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

  20. 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.

  21. Numerical Problem • A EER from 5.0 to 9 saving and pay back period

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