11. Air Conditioning EDIT

7/29/2019 11. Air Conditioning EDIT

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AIR VOICE TECH


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Maintain comfort temperature levels

Maintain adequate humidity levels

Improve overall quality of air

Supply ventilation as per requirements

EGEE 102 - Pisupati 2


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RelativeHumidity A measure of how

much water is inthe air relative tothe maximumamount air canhold at that tee

temperature


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EGEE 102 - Pisupati 4http://www.ae.iastate.edu/Ast473/Lectures/%285%29Psychrometric_Chart/sld024.htm
http://www.ae.iastate.edu/Ast473/Lectures/(5)Psychrometric_Chart/sld024.htmhttp://www.ae.iastate.edu/Ast473/Lectures/(5)Psychrometric_Chart/sld024.htmhttp://www.ae.iastate.edu/Ast473/Lectures/(5)Psychrometric_Chart/sld024.htm


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AIR VOICE TECH 5

A. Expansion Valve

B. Compressor


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Room air conditioners

Central air conditioning systems

Heat pumps

Evaporative coolers



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Room air conditioners cool rooms rather thanthe entire home.

Less expensive to operate than central units

Their efficiency is generally lower than that ofcentral air conditioners.

Can be plugged into any 15- or 20-amp, 115-volt household circuit that is not shared with

any other major appliances



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Circulate cool air through a system of supplyand return ducts. Supply ducts and registers(i.e., openings in the walls, floors, or ceilingscovered by grills) carry cooled air from the airconditioner to the home.

This cooled air becomes warmer as it circulatesthrough the home; then it flows back to thecentral air conditioner through return ductsand registers



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split-system an outdoor metal cabinet contains the condenser

and compressor, and an indoor cabinet contains theevaporator

Packaged the evaporator, condenser, and compressor are all

located in one cabinet



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Outside air is drawn in,filtered and heated before itpasses through the main airconditioning devices. The

colored lines in the lower partof the diagram show thechanges of temperature and ofwater vapor concentration(not RH) as the air flowsthrough the system.



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Variable fresh air mixer and dust and pollutantfiltration.

Supplementary heating with radiators in the

outer rooms and individual mini heater and Humidifier in the air stream to each room.



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how large your home is and how manywindows it has;

how much shade is on your home's windows,walls, and roof;

how much insulation is in your home's ceilingand walls;

how much air leaks into your home from theoutside; and

how much heat the occupants and appliancesin your home generate

AIR VOICE TECH 16


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Air conditioners are rated by the number ofBritish Thermal Units (Btu) of heat they canremove per hour. Another common rating term

for air conditioning size is the "ton," which is12,000 Btu per hour.

Room air conditioners range from 5,500 Btu perhour to 14,000 Btu per hour.



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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 coolingenergy costs by replacing it with a newer, moreefficient model



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Rating is based on how many Btu per hour areremoved 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



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Built after January 1, 1990, need have an EER of8.0 or greater

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

EER over 10 for warmer climates



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National minimum standards for central airconditioners require a SEER of

9.7 for single-package and

10.0 for split-systems Units are available with SEERs reaching nearly 17



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Locate the air conditioner in a window or wallarea near the center of the room and on theshadiest side of the house.

Minimize air leakage by fitting the room airconditioner snugly into its opening and sealinggaps with a foam weather stripping material.



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A EER from 5.0 to 9 saving and pay backperiod


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11. Air Conditioning EDIT