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AIRCONDITIONING
TYPES OF AIR CONDITIONERS
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The selection of equipment for heating, cooling &
ventilating is a complex design decision that mustbalance with:
* Heating* Cooling needs
* Energy efficiency* Humidity control* Potential for natural ventilation* Adherence to codes and standards
* Outdoor air quantity and quality* Indoor air quality and* Cost.
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Sequential activities related to making conditioned air
Air conditioning is a process which cools (or heats),cleans, circulates, freshens air & control its moisture
content simultaneously.
FreshAir inlet
Air Filters
Air heaters
Air coolers
Blower fan
Humidifiers
Conditioned air is circulated by compression & suctioncreated by the blower/centrifugal flow fan. Both supply& return are parts of air circulation system.
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TYPES OF AIR CONDITIONING
CentralAir ConditioningSystem
UnitAir ConditioningSystem
AHU basedCompartmentalAir ConditioningSystem
UnitAir Conditioners
Split AC PackagedType
Ductable Non Ductable
The systems are basically the same as far as making theconditioned air is concerned, the only difference beingwhere it is prepared and methods of supply & return.
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Centrally placed plantdistributing air to all use spaceswith use of ducting network. Nearly 80% of air returnedback by return air ducts. Situated along with ancillary
plants & equipments preferablyon GF. Delivers air to weather makerrm. From where it is circulatedvertically & horizontally.
Central Air Conditioning& Heating System
CENTRAL AIR CONDITIONING SYSTEM
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AHU BASED AIR
CONDITIONING SYSTEM
For preparation of conditioned air building is divided part wiseand floor wise which is managed by AHUs. These self functioning units are conditioning air and supplying itto use spaces
Nearly 60-70% of air returned back by return air ducts to AHUs. No vertical connection between AHUs for fire fire safety. Chilled water @ 5-7 deg C is supplied by insulated Cu tubesfrom chiller plants. Used water is returned back.Chilling plant for AC load of more than 50 TR.
Air Handling Units
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SPLIT SYSTEM OF AIR
CONDITIONING
Single or Multi Split- Ductable or Non Ductable. Works on principle of splitting or division of Unit AC System. Reason being mainly the problem of getting external wall for
fresh air & release of hot air.Refrigerating machine along with noise generating units likecompressors are kept away. Ceiling, Floor or Wall mounted.
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A window air conditioner unit implements a complete air conditioner
in a small space. The units are made small enough to fit into a standardwindow frame.
It contains: A compressor
An expansion valve
A hot coil (on the outside)
A chilled coil (on the inside)
Two fans
A control unit
The fans blow air over the coils to improve their ability to dissipate
heat (to the outside air) and cold (to the room being cooled).
WINDOW UNIT AIR CONDITIONING
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AIR CONDITIONING & HEATING WITH ROOM UNITS
Room units condition the air in one room
Self-contained systems
Cooling only or heating/cooling models
Units that provide heating can use electric stripheaters or reverse-cycle refrigeration (heat pump)
Some units can be used to condition the air in morethan one room
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ROOM AIR CONDITIONING: COOLING
Can be window or though-the-wall type units
Most units have one fan motor that is used for both theevaporator and condenser (2 shafts)
Unit capacity ranges from 4,000 to 24,000 btu/h
Units can be front or top discharge
Units can be fixed to the case or have a chassis that slides outof the case (sleeve)
Slide-out chassis are easier to service Installed in the window or through the wall
Units should have a dedicated electric circuit
Unit must be properly supported
Air must be able to circulate freely
Through the wall units can be installed during buildingconstruction (sleeves are installed when walls are constructedand the units are slid in afterwards)
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INSIDE OUTSIDE
Brace kit suppliedwith unit
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Return air to theunit
Supply air to thespace
Window unit withfront discharge
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Return air to theunit
Supply air to thespace
Wall unit with topair discharge