All about HVAC (Heating, Ventilation & Air Conditioning) created by MGCS http://www.mgcs.net.in

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