HVAC

ALL ABOUT HVAC HEATING VENTILATION AND AIR CONDTIONING

WHAT IS HVAC?Heating, Ventilation, and Air Conditioning.

WHAT DOES IT DO?HVAC is a basic requirement for your indoor air quality, what you breathe, temperature, humidity in your house.

So when you hear the term "HVAC" it means the entire air system of your place.NEED OF HVAC SYSTEMImprovement of the air qualityMoisture regulationBalancing environmentMaintenance of the constant temperature throughout the yearEnergy conservation

HVAC COMPONENTSFurnaceHeat exchangerEvaporator CoilDuctsVentsCondensing UnitRefrigerant LinesThermostatHEATINGCONVECTION - Collective movement of groups ofmoleculeswithinfluids, throughdiffusion

CONDUCTION - Transfer ofinternal energyby microscopicdiffusionand collisions of particles within a body due to a temperature gradient.

RADIATION -Electromagnetic waves(EMR) travel through avacuumor through matter-containing media.

DISTRIBUTION OF HEAT

WATER / STEAM -Piping is used to transport the heat to the rooms. Modern hot water boiler heating systems have a circulator, which is a pump, to move hot water through the distribution system .

AIR-Warm air systems distribute heated air through duct work systems of supply and return air through metal or fiberglass ducts.Many systems use the same ducts to distribute air cooled by an evaporator coil for air conditioning.VENTILATIONMECHANICAL OR FORCED - Provided by an air handler and used to control indoor air quality. Excess humidity, odours, and contaminants can often be controlled via dilution or replacement with outside air. Kitchens and bathrooms

NATURAL - ventilation of a building with outside air without using fans or other mechanical systems.-reduces spread of diseases- tuberculosis, common cold. VENTILATION EFFECTIVENESSEffective mixing of ventilation air within spaceNet positive pressure in the southeast; exhaust from appropriate spacesProvide clean outdoor air, avoid:

loading docks exhaust vents plumbing stacks waste collection stagnant water

AIR CONDITIONINGAn air conditioner is like a refrigerator without the insulated box. It evaporates a refrigerant, like Freon, to provide cooling.

Most Air Conditioners Have:A compressor An expansion valve A hot coil (on the outside) A chilled coil (on the inside) Two fans A control unitBASIC REFRIGERATION CYCLE

BENEFITS OF HVAC

Increases Comfort

Conserves Energy

Regulates Moisture

Air Quality Improvement.

APPLICATIONS OF HVACFree cooling during moderate temperatures (chiller bypass).Thermal storageisolation of storage tankWater source heat pump pre cooler with isolationHeating potable hot water (instantaneous heater)Waste heat recovery from condenser water

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