air conditioning equipments
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AIR CONDITIONINGEQUIPMENTS
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L IST OF EQUIPMENTS
COOLING COILS
HEATING COILS
AIR CLEANING DEVICES (FILTERS)
HUMIDIFIERS
DEHUMIDISFIERS
FANS AND BLOWERS
GRILLS AND REGISTERS
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COOLING COILS
Cooling coils are usually made of copper tubingwith alluminium fins.
The no. of fins placed per centimeter is called
fin density.
The surface area provided by the fins and
available for heat exchange is calledsecondary area.
The inner surface area of tubes through which
water flows is called asprimary area.
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The performance of a cooling coil depends on following
factors:
The amount of sensible and latent heat that must be
transferred from the air
DBT and WBT of air entering and leaving
Water or refrigerant velocity
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HEATING COILS
The heating of air could be carried out by manydevices
Steam coils
Hot water coil
Electric heaters
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AIR CLEANING
METHODS OF AIR CLEANING
AIR FILTRATION
AIR STERILIZATION
AIR IONIZATION
ODOUR SUPPRESION
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Wet filters
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Centrifugaldust collector
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VISCOUS FILTERS
These filters are made in form of pads usingglass wool , steel wool. These pads are
impregnated with viscosine which is oily
substance.Viscous filters are available from 80m3/min to
600m3/min flow of air.
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ELECTRIC FILTERS
Air is passed between a pair of oppositely
charged conductors and it becomes ionised asthe voltage applied between the conductors is
sufficiently large(8000 to 15000V).
This unit consists of set of vertical plates spaced15 to 20mm apart. alternate plates are positively
charged and earthed and attract the negatively
and positively charged dust particlesrespectively.
To remove the dust accumulation, the collector
plates are cleaned periodically by washing them
with hot water s ra14
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CENTRIFUGAL DUST COLLECTORS
A high velocity air stream is directed into aconical chamber. This produces a whirling air
current within the chamber and throws the
heavier dust particles to the sides and fall out ofair stream and are collected at bottom of
cleaner.
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SELECTION OF FILTERS
Factors to be considered in evaluating thesuitability of air filter
The degree of air cleanliness required
Amount of air handled
Type of dust particles to be filtered
The method of disposal of collected dust
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ODOUR SUPPRESSION
Use of activated carbon (charcoal) for removinggases and odours by ADSORPTION
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HUMIDIFIERS
By injecting the steam
Atomizing the water
Atomization type humidifiers
Impact type humidifiers
Evaporating the water
Heated water type
Heated air type
Air washer
Spray type air washer
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HUMIDIFICATION BY INJECTING
THE STEAM
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HUMIDIF ICATION BY ATOMIZING
THE WATER INTO AIR
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22 IMPACT TYPE HUMIDIFIER
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HUMIDIF ICAION BY
EVAPORATING WATER INTO AIR
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HEATED
WATER TYPE
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HUMIDIFICATION BY AIR
WASHING
SPRAY TYPE AIR WASHER HUMIDIFIER
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DEHUMIDIFIERS
By reducing the temperature of air below itsDPT
Spray type dehumidifier
Liquid absorbent dehumidifier
Solar driven dehumidifier
Gear heat pump dehumidifier
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BY REDUCING THE AIR TEMPERATURE BELOW DPT or
BY REFRIGERATION
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27 GEAR HEAT PUMP DEHUMIDIFIER
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28 Liquid absorbent dehumidifier
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FANS AND BLOWERS
AXIAL FLOW FANS
PROPELLER FAN(2- 6)
DISK TYPE FAN
CENTRIFUGAL FANS or RADIAL FLOW FANS FORWARD CURVE
BACKWARD CURVE
RADIAL
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SELECTION OF FAN
Selection depends on
volume of air required to be circulated in
m3/min
Total system resistance
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GRILLS AND REGISTERS
A Decorative covering for an outlet or intake is knownas grill
A grill provided with damper is known as Register
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