VENTILATION SYSTEM IN ANIMAL HOUSES.pptx

VENTILATION SYSTEM IN ANIMAL HOUSE
WHY DO WE need VENTILATION?
To keep Air movement
To keep cooling
To keep control relative humidity
To improve air quality for confined animals.
Air distribution
To remove moisture, gases, dust, odors and pathogens
For livestock productivity.
To limit carbon dioxide & methane buildup.

1. VENTILATION SYSTEM IN ANIMAL HOUSE Email id :[email protected] BY - DR. RISHI KUMAR Ph.D. Scholar ICAR IVRI

2. VENTILATION SYSTEM IN ANIMAL HOUSE INTRODUCTION- Ventilation is the process by which ‘clean’ air (normally outdoor air) is intentionally provided to a space and stale air is removed. This may be accomplished by either natural or mechanical means.

3. WHY WE NEED VENTILATION ? To keep Air movement To keep cooling To keep control relative humidity To improves air quality for confined animals. Air distribution To remove moisture, gases, dust, odors and pathogens For livestock productivity. To limit carbon dioxide & methane buildup.

4. How livestock productivity affected by faulty ventilation ?

5. In over ventilated animal houses :-

6. STANDARDS OF VENTILATION

7. TYPES OF VENTILATION

8. Natural ventilation: Simplest system of ventilation Depends on three forces: - Wind Diffusion Inequality of temperature

9. NATURAL VENTILATION Broadly three types of natural ventilation are in use: 1. A fixed open ridge with a protective cap: sufficient in climatic housing for cattle 2. A simple chimney type Satisfactory for a limited area of controlled outlet ventilation The throat can be controlled by a butter- fly value or hinged flap 3. Hopper- type windows Fitted with gussets to prevent direct draughts serving as principal inlets Small baffled openings left open during cold or windy weather

10. MECHANICAL VENTILATION 1.Exhaust ventilation: Air is extracted to the outside from the inside by an exhaust fan operated electrically 2.Plenum ventilation: Fresh air is blown into the room by centrifugal fans so as to create a positive pressure & replace the vitiated air proportionate Broadly four types of mechanical ventilation are in use:

11. 3.Balanced ventilation: This is a combination of exhaust & plenum system of ventilation. 4.Air conditioning: It is the simultaneous control of all factors affecting both physical & chemical conditions of atmosphere within a structure

12. MECHANICAL VENTILATION Depending on the type of ventilation system, there may be a (A) Negative, (B) Positive, or ( C) Neutral pressure inside the barn compared with the outside:

13. MECHANICAL VENTILATION A number of alternatives are also being developed as per need 1.Cross & end to end ventilation: Animal house size: 12 m X 30 m By fixing a number of fans in one of the side walls (opposite to the side wall providing air entry) 2.Ventilation of wide span building (14-22 m) By diffusing the incoming air by means of a filter of glass- fibre or hessian Peg board/slotted hard-board as ‘diffusing’ agents: prevent the clogging of the fine glass-fibre filters