3. Ventilation
Ventilation means moving the right amount of air at the right time
and in such a way to manage temperature, humidity and other
environmental factors for optimum bird performance
4. Housing and Ventilation
Systems
• There are two basic types of ventilation system:
•Natural Ventilation • Also known as “open-
sided”, “curtain-sided”, or “natural” houses. • Fans may be
used inside the house to circulate and move air.
•Power Ventilation (Controlled/Closed
environment housing) • These houses usually have either solid
sidewalls or curtains that are kept closed during house
operation. • Fans and inlets are used to ventilate the house.
5. Objectives of Ventilation
Maintain uniform temperature
Provide fresh air
Remove undesirable gases
Remove moisture
Keep the litter dry
Keep uniform condition in the house
8. Minimum ventilation
Achieving the correct operating negative pressure to ensure
incoming air is drawn at high speed up towards the apex of the
roof is critical.
Air inlets should be opened a minimum of 5 cm (2 in) and opened
inlets should be distributed evenly around the house.
Evaluating bird behavior and house condition is the only real way
to determine if minimum ventilation settings are correct.
12. Tunnel ventilation
Tunnel ventilation is used in warm to hot weather or where
large birds are grown.
Cooling is achieved through high-velocity airflow.
Care should be taken with young birds which are prone to
wind chill.
14. Transitional ventilation
• Transitional ventilation is a temperature driven process which
removes excess heat from the house when the temperature
increases above the desired set point.
• Transitional ventilation is used when the outside air is too
cold and/or the birds are too young for tunnel ventilation to
be implemented.
• Evaluating bird behavior is the only real way to determine if
Transitional ventilation settings are correct.
18. Ventilation of Poultry House
STANDRD DIMENSIONS
• Length 450 ft
• Width 45 ft
• Height 8 ft
19. Pad Cooling System
• In pad cooling systems, cool air is drawn through a water
soaked filter (cooling pad) by the tunnel ventilation fans.
• Cooling pads should be installed at the opposite end of the
house to the tunnel fans.
• Half of the total cooling pad area should be installed on each
sidewall
22. Static Pressure
• When we run the exhaust fans a negative pressure is
created inside the house. To measure the difference of
outside and inside pressure we use the term ‘Static
Pressure’. It is mentioned in Pascal or inches.
23. Static Pressure Calculation
• 1 inch water Colum = 249 pascals
• Width of house in meter ÷ 249
• = 14 ÷ 249
• = 0.056 iwc
24. Controlling humidity
• The main aim of controlling relative humidity is maintaining
dry friable litter.
• Moisture is produced by the heating system, drinking system
and the birds.
• To reduce relative humidity, the only option is to increase the
air temperature
• Approximately for every 1 ℃ we heat the air, the relative
humidity of the air is reduced by 4.5%.
25. Relative Humidity and
temperature
Moisture holding capacity of air at certain temperature.
• Relative humidity is the ratio of the partial pressure of water
vapor to the equilibrium vapor pressure of water at a given
temperature.
Temperature is measured in C or F.
27. Fan Calculation
Volume of House = Length x Width x Height
= 450 x 45 x 8
= 162000 cub. Ft
Cross Section of House= Width X Height
45 X 8 = 360 sq. ft
• Length of the house are recommend (length + 50-75) 500
ft/min
Fan Capacity
• 18000 cfm
• 22500 cfm