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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