HVAC Training.ppt

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    HVAC Presentation SYNERGY E L V Division

    HVACFUNDAMENTALS

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    HVAC Presentation SYNERGY E L V Division

    HVAC is an acronym for Heating, Ventilation and AirConditioning.

    HVAC is a historical term that is commonly known today asair conditioning.

    A HVAC system maintains and controls the conditions ofthe inside environment.

    A HVAC system delivers comfort, health and well being in theworkplace or home,or controls conditions for

    manufacturing and industrial processes.

    A HVAC system comprises air conditioning plant, air and waterreticulation, and controls.

    What is a HVAC system ?

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    HVAC Presentation SYNERGY E L V Division

    HVAC systems are designed to overcome the outside environmentand building design.

    HVAC systems are designed to maintain comfort conditions forthe building occupants.

    HVAC systems are designed to maintain stringent conditions forindustrial processes.

    HVAC systems are designed to meet energy costs and reliabilityfrom an owners point of view.

    What affects a HVAC system design ?

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    HVAC Presentation SYNERGY E L V Division

    Ventilation- the process of exchanging air between theoutdoors and the conditioned space.

    Air movement- the process of circulating and mixing airthrough conditioned spaces.

    Cleaning- the process of removing particles and biological

    contaminants in the air. Heating- the process of adding thermal energy (heat) to the airin the conditioned space.

    Cooling- the process of removing thermal energy (heat) fromthe air in the conditioned space. Humidifying- the process of adding water vapor (moisture) tothe air.

    Dehumidifying- the process of removing water vapor(moisture) from the air.

    What are the main processes carried out by aHVAC system ?

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    HVAC Presentation SYNERGY E L V Division

    Refrigeration Process

    Refrigeration is the process of removing heat at a lowtemperature level & rejecting it at a relatively highertemperature level.

    Refrigerant is nothing but heat carrier i.e. heat carrying

    medium.

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    HVAC Presentation SYNERGY E L V Division

    Vapor Compression Refrigeration Cycle

    Condenser

    Evaporator

    Cold Gas

    Line

    Compressor

    Cold Liquid Line

    Hot Gas Line

    HighPressure/Low Temp

    Low Pressure/

    Low Temp

    High Pressure/

    High Temp

    Low Pressure/

    Low Temp

    Heat

    AbsorbedHeat

    Rejected

    Expansion

    Device

    Cold Liquid Line

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    HVAC Presentation SYNERGY E L V Division

    Types of Systems

    Direct Expansion (DX System).

    1.Window Airconditioner

    2.Split Units.3.Packaged Unit.

    Chilled Water System (DW System)

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    HVAC Presentation SYNERGY E L V Division

    Unitary Air Conditioning Units. (PackageUnits.DX System)

    Unitary A/C units are self contained with

    fan, refrigeration compressor, condenser,etc.

    Individual room units are designed to fitinwindows or a wall mounted consoles.

    Split systems are where the fan and coilare mounted inside and the condensingunit is mounted remote.

    Vertical self contained air conditioners aremounted external and air is ducted to theroom.

    Roof top units are weatherproof units andthe air is ducted to the space below.

    Window Unit.1. Outside air 2. Exhaust air 3. Supply4. Return air 5.Outside & room fans6. Evaporator 7.Compressor 8. Conden9. Exp. valve 10.Refrig. Pipe 11. Air filte12.Grille 13.Condensate collector14. Casing 15. Window 15. Room

    Outside air Room air

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    HVAC Presentation SYNERGY E L V Division

    Unitary AC Units. (Split systems. DX System)

    As the name implies, the air conditioner is

    split into two parts, refrigeration andventilating parts.

    The refrigeration part consists of acompressor and an air cooled condenser.

    The ventilating part consists of a fan andan evaporator to cool or heat the air.

    The condensing unit is mounted outsidewhich assists condenser heat dissipationand reduces noise in the room.

    The fan coil unit can be mounted in theroom or in a remote position with duct tothe room.

    Split System.

    1. Outside air 2. Exhaust air 3. Supplyair 4. Return air 5. Room 6. Evaporator

    7.Compressor 8. Condenser 9. Exp.valve 10.Refrigerant pipe 11. Condensingunit. 12.Fan coil unit. 13.Ventilation grid14. Filter

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    HVAC Presentation SYNERGY E L V Division

    DX System

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    HVAC Presentation SYNERGY E L V Division

    In-Direct System

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    HVAC Presentation SYNERGY E L V Division

    Sample Screens - Water Cooled Chiller

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    HVAC Presentation SYNERGY E L V Division

    Sample Screens-Air Cooled Chillers

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    HVAC Presentation SYNERGY E L V Division

    Sample Screens- Chillers

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    HVAC Presentation SYNERGY E L V Division

    Sample Screens- Cooling Tower

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    HVAC Presentation SYNERGY E L V Division

    Sample Screens-Basic AHU

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    HVAC Presentation SYNERGY E L V Division

    Sample Screens-Basic AHU

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    HVAC Presentation SYNERGY E L V Division

    Sample Screens-Treated Fresh Air Unit

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    HVAC Presentation SYNERGY E L V Division

    All - Water Systems.( 2-pipe fan coil unitsystem.)

    Two water pipes are led to each fan coil unit,

    cold water is pumped in summer,hot water in winter.

    Thus only cold water or hot water is