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HEATING VENTILATION AND AIR CONDTIONING

1. CADmantra Technologies Pvt. Ltd. Design Engineer CADmantra Technologies Pvt. Ltd. Contact :bholapatel.me@gmail.com Technical seminar on HEATING VENTILATION AND AIR CONDTIONING

2. CONTENT • Introduction to HVAC • History of HVAC • Need of HVAC • Heating • Ventilation • Air conditioning process • Types of installation • Recent Development in HVAC • Advantages & Disadvantages • Applications of HVAC • Conclusion

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. 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. • 1902 cooling the New York stock exchange-one of the first comfort cooling system.

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

7. HVAC COMPONENTS • Furnace • Heat exchanger • Ducts • Vents • Air Conditioning Unit • Evaporator Coils • Condensing Unit

8. FURNACE • As part of the HVAC, the furnace heats the air that circulates in the home. • The quality of air in the home can be influenced by how often you change the air filter on your unit. • Usually the Air Conditioner is outside, and the furnace is inside the house. • The HVAC uses the same venting system for both.

9. WHAT ARE BTU’S AND EER’S • BTU or British Thermal Units, are the amount of heat required to raise the temp. of one pound of water, 1 degree Fahrenheit. 1 ton= 12,000BTU. • EER is Energy Efficiency Rating and tells you the BTU rating over the wattage. The higher the EER, the better the energy efficiency, but it will probably cost more.

10. 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.

11. GENERATION OF HEAT • Heaters exist for various types of fuel, including solid fuels, liquids, and gases. • Another type of heat source is electricity, typically heating ribbons made of high resistance wire. • This principle is also used for baseboard heaters and portable heaters. • Electrical heaters are often used as backup or supplemental heat for heat pump systems.

12. 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.

13. 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.

14. IMPROVED 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

15. 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

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