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    Basic of HVAC

    HVAC- Heating ,Ventilation and Air-Conditioning.In other words HVAC is the technology of which we can control his indoor and vehicular environment.

    History of HVAC:

    • In 1851 Dr. John Gorrie was granted U.S patent for Refrigeration machine.
    • In 1880 Refrigeration became available for industrial purpose.Initially two major uses-freezing meat for transport and making ice.
    • Early 1990-new initiative to keep building cool for comfort.
    • In 1902 Cooling the New york stock exchange which is one of the first comfort cooling system.

    Need of HVAC System:

    • Improvement of the Air Quality.
    • Moisture Regulation.
    • Maintenance of the constant temperature throughout the year.
    • Energy Conservation.

    Function of HVAC:

    • Control of Air Temperature.
    • Control of Moisture Content in the Air.
    • Proper Air Movement.
    • To hold the Air Contamination within Acceptable limits.

    HVAC PROCESS:

    WARM COOLING
    COLD HEATING
    HUMID DE HUMIDIFICATION
    DRYNESS HUMIDIFICATION
    ODOUR EXHAUST/FRESH AIR
    STALE AIR FRESH AIR
    NOISY AMBIENCE NOISE TREATMENT
    DUSTY,SMOKY FILTRATION/VENTILATION
    CROSS CONTAMINATION FILTRATION/PRESSURISATION

     

    APPLICATION OF HVAC:

    • Residential
    • Commercial
    • Hotels
    • Hospitals
    • Airports/Railways
    • Arenas
    • Malls
    • Schools,Colleges & Universities.

    COMFORT ZONE IN HVAC:

    Temperature 20 to 25 deg Celsius.
    Humidity 30% relative humidity(RH) and 60% RH.
    Pressure A slightly positive pressure to reduce outside air infiltration.
    Ventilation Rooms typically have several complete air changes per hour.

     

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