introduction to HVAC system.

1. B Y :
e n g . A B D U L L A H S A M I
HVAC System

2. TABLE CONTENTS
 Introduction.
 Goals.
 Heating
 Ventilation.
 Air conditioning types and description.
-DX sys.
-Chiller sys.
-cooling tower sys.
 Air handling unit.
 Differences.

3. INTRODUCTION
 HVAC stands for heating, ventilation, and air
conditioning. is the technology of indoor and
vehicular environmental comfort. Its goal is to
provide thermal comfort and acceptable indoor air
quality. HVAC systems control the ambient
environment (temperature, humidity, air flow, and
air filtering).HVAC is an important part of
residential structures which making it safe and
habitable.

4. GOAL’S

5. HEATING
 Is the process of generating heat used to warm the
space to be via the following applications (boiler ,
furnace, electricity or heat pump) to heat water or air
in central location.

6. VENTILATION
 Ventilation is the process of changing or replacing
air in any space to control temperature or remove
any combination of moisture, odors, smoke, heat,
dust, airborne bacteria, or carbon dioxide, and to
replenish oxygen. Ventilation includes both the
exchange of air with the outside as well as circulation
of air within the building. It is one of the most
important factors for maintaining acceptable indoor
air quality in buildings

7. AIR CONDITIONING
 Air conditioning is controlled in the interior air
temperature and movement and humidity and
temperature process. Air-cooled when the weather is
warm, heated up when the weather is cold. Air
conditioning works to get rid of excess moisture from
the air, or add to it if the need arises. It also works to
remove dirt and dust from the air, which makes it a
better health. Which makes us more comfortable at
work and at play and during sleep.

8. BASIC OPERATION CYCLE

9. AIR CONDITIONING TYPES
 There are three main types:
 DX system.
 Chiller system.
 Cooling tower system.

10. DX SYSTEM
 In the DX system the air used for cooling the room
or space is directly passed over the cooling coil of the
refrigeration plant. There is three types of DX
system:
 Window AC.
 Split unit.
 Package unite.

11. CHILLER SYSTEM
 Is a system that uses water to cool the air in other
words, the water is cooled via the heat exchanger is
the swap hot water with the coolant from the
evaporator.

12. COOLING TOWER
 A cooling tower is a specialized heat exchanger in
which air and water are brought into direct contact
with each other in order to reduce the water's
temperature. As this occurs, a small volume of water
is evaporated, reducing the temperature of the water
being circulated through the tower.be of higher
efficiency in the Dry Areas.

14. AHU
 is a device used to regulate and circulate air as part
of a heating, ventilating, and air-conditioning
(HVAC) system.

15. DIFFERENCES
DX sys. Chiller sys. Cooling tower
• Small capacity
comparison other
types.
• Use refrigerant to
cooling air.
• Lower Price.
• Use for a Large
capacity spaces like
mall .
• Use refrigerant to
cooling water then
cooling air.
• High price.
• Use for a power plant
and Industrial facilities
• Use water to cooling.
• High price.