1. some air conditioning unit features 2
TRANSCRIPT
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Prepared by Joel Talam
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A vapor refrigeration compression
cycle: A review
Evaporator
Condenser
CompressorMeteringdevice
Fan
Fan
Energy in
Energy in
Energy out
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1. EER
2. Noise Level
3. Compressor and Fan Motor Robustness
4. Fast Cooling
5. And Other Features
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1. What is EER?
Energy Efficiency Ratio
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Energy rate(electrical powerinput, w) Energy we
want (rate ofeffect ofrefrigeration,Btu/hr)
MACHINE(Airconditioningunit)
EER
rate of effect of refrigeration inBtu/hr
EER= ----------------------------------------------------------electrical power input in watts
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Experimental parameters
Ambienttemperature95F(35C)
Conditionedroom
80F(26.7C) dbt67F(19.4C) wbt
A/C
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Example:
A 12,000-Btu/hr air conditioner consumes 1,200 watts .Find its EER.
EER = (12,000 Btu/hr)/(1,200 watts) = 10
The higher the EER is, the more efficient the airconditioning unit is. However, a higher EER is usually
accompanied by a higher price.
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SEER - Seasonal Energy Efficiency Ratio
- computed in a normal annual usage- standard depend on every country or state
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2. What is noise level?Air disturbance our hearing can detect. Its sound
power is expressed in decibel (dB)
A/C unit
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0 dB is nearly total silence
a sound ten times more powerful than near total silenceis 10 dB
a sound 100 times more powerful is 20 dB.
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From ASHRAE
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Window type A/C units less than 40 dB
Single package type A/C units less than 75 dB
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3. Compressor and Fan
Motor Robustness
Refers to the reliability of the compressor and othermotors in the unit
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Compressor major failures:1. open windings
2. grounded
3. unusually high current4. mechanical stuck up
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The rate of cooling a space to the desired coldtemperature.
4. Fast Cooling
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Factors to improve the rate of cooling1. velocity of air from the evaporator
2. correct refrigerant charge
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5. And other Features1. Easy Maintenance
2. Health considerations3. Easy to operate
4. Optimizing usage of conditioned air
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Maintenance Easy servicing
Available parts
Simple technologyAvailable manuals
Nearby service centers
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Health considerationsAir filters are disinfectant
Mosquito repellant
Ionizer
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Easy to operate1. Fool proof
2. Simplified remote control commands
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Optimizing usage of conditioned air1. Air louvers
2. Recommendation of A/C location
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What component in an A/C unit can
EER be increased, and how? 15 min 1.
2.
3. 4.
5.
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End of the session
Thank you