HVAC and heat transfer

1. SHRI RAMSWAROOP MEMORIAL GROUP OF
PROFESSIONAL COLLEGES, LUCKNOW
SEMINAR ON
HEATING, VENTILATION,ANDAIR CONDITIONING
PREPARED BY
SEMINAR GUIDE
MR.A.K. RATHORE
PROF. P.C. TRIPATHI
PANKAJ GAURAV
1312240141

2. CONTENT
▶ Introduction to HVAC
▶ Need of HVAC
▶ Heating
▶ Ventilation
▶ Air conditioning process
▶ Types of installation
▶ Advantages & Disadvantages
▶ Applications of HVAC

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

4. 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 home.

5. NEED OF HVAC SYSTEM
▶ Improvement of the air quality
▶ Moisture regulation
▶ Maintenance of the constant temperature throughout the year
▶ Energy conservation

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. VENTILATION
▶ 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 -ventilation of a building with outside air without
using fans or other mechanical systems. -reduces spread of diseases-
tuberculosis, common cold.

8. AIR CONDITIONING UNIT
▶ 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
▶
▶ Compressor
Expansion
V
alve
Evaporator
Condenser

9. HVAC COMPONENTS
▶ Fans / Blowers
▶ Furnace / Heating unit
▶ Filters
▶ Compressor
▶ Condensing units
▶ Evaporator (cooling coil)
▶ Control System
▶ Air Distribution System

10. COMPRESSOR
▶ Heart of the system.
▶ Responsible for compressing and transferring refrigerant.
▶ Very high volumetric efficiency (almost 98%)

11. CONDENSER
▶ Responsible for heat dissipation. The condenser is
designed to radiate heat.
▶Hot compressed refrigerant vapour cools at constant
pressure to liquid.

12. EVAPORATOR
▶ An evaporator is a device used to turn the liquid form of a chemical
into its gaseous form while absorbing heat in the process.
▶ liquid passes through a filter before entering the evaporator.

13. TYPES OF INSTALLATION
▶ Window unit and packaged terminal

14. Split system

15. ADVANTAGES OF HVAC
▶ Conserves Energy
▶ Regulates Moisture
▶ Air Quality Improvement.

16. DISADVANTAGES OF HVAC
▶ Initial installation cost is high
▶ Primary disadvantage of ductless air conditioners is their cost

17. APPLICATIONS OF HVAC
▶ Thermal storage—isolation of storage tank
▶ “Free cooling” during moderate temperatures
▶ Water source heat pump pre cooler with isolation
▶ Waste heat recovery from condenser water

18. Thank you