HVAC (heating, ventilation, and air conditioning) systems are used to control indoor air quality by regulating temperature, humidity, and air quality. An HVAC system generally includes a furnace, air conditioner, ducts, vents and thermostat. It can heat or cool spaces through convection, conduction, or radiation and distributes heated or cooled air through ductwork or piping for water systems. Proper ventilation and filtration are also important for improving indoor air quality.

1. ALL ABOUT HVAC
HEATING VENTILATION AND AIR CONDTIONING

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

3. 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.

4. NEED OF HVAC SYSTEM
• Improvement of the air quality
• Moisture regulation
• Balancing environment
• Maintenance of the constant temperature throughout
the year
• Energy conservation

5. HVAC COMPONENTS
• Furnace
• Heat exchanger
• Evaporator Coil
• Ducts
• Vents
• Condensing Unit
• Refrigerant Lines
• Thermostat

6. HEATING
CONVECTION - Collective movement of groups
of molecules within fluids , through diffusion
CONDUCTION - Transfer of internal energy by
microscopic diffusion and collisions of particles within a
body due to a temperature gradient.
RADIATION - Electromagnetic waves (EMR) travel
through a vacuum or through matter-containing media.

7. 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.

8. VENTILATION
MECHANICAL 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.

9. VENTILATION EFFECTIVENESS
• Effective mixing of ventilation air within space
• Net positive pressure in the southeast; exhaust from
appropriate spaces
• Provide clean outdoor air, avoid:
– loading docks
– exhaust vents
– plumbing stacks
– waste collection
– stagnant water

10. AIR CONDITIONING
An 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 unit

11. BASIC REFRIGERATION CYCLE

12. BENEFITS OF HVAC
1. Increases Comfort
2. Conserves Energy
3. Regulates Moisture
4. Air Quality Improvement.

13. APPLICATIONS OF HVAC
• “Free cooling” during moderate temperatures (chiller
bypass).
• Thermal storage—isolation of storage tank
• Water source heat pump pre cooler with isolation
• Heating potable hot water (instantaneous heater)
• Waste heat recovery from condenser water

14. Created by-
Tel.: +91 9711820827 | Web.: http://www.mgcs.net.in