Puricare Industrial Enterprises: VENTILATION AND COOLING SYSTEMS FOR POULTRY FARMS - When a tunnel ventilation system is in place, it is relatively easy to add a cooling system. For this purpose so-called pads are used.The resulting airflow makes the water evaporate and cools down the hot air.

Poultry farms

ventilation

and cooling systems

There are several options for ventilating poultry buildings.

The result depends on the correct calculation, installation and operation of the system.

Here follows a description of the most important systems:

1. Natural ventilation

Natural ventilation

This system does not use any fans for moving air, but depends on the natural draught in the building.

The sidewalls are usually open and can be controlled with curtains or other material, whilst the ridge is open and can sometimes also be controlled.

Hot air rises and leaves the building through the open ridge. Fresh, cooler air enters through the sidewalls. When there is no wind and temperatures are high, results can be very poor.

2. Mechanical ventilation

This system uses fans and the air is forced through the building. The most common type is roof ventilation.

a. Roof ventilation

Fans are placed in airshafts in the ridge of the roof to suck the air out of the stable. Air inlets are placed in both sidewalls.

b. Cross ventilation

For cross ventilation the fans are placed on one side of the long wall of the building ,whilst the air enters through adjustable inlet flaps in the other sidewall.

The fans have diameters of 122 or 90cm and depending on type displace 16,000-45,000 m³ of air per hour.

These fans can be installed in groups, but also divided across the full length of the building.

They are controlled in stages, where in turn one or two fans start running at full speed.

For minimum ventilation a time function can be set or a variable speed can be used.

c. Length ventilation

This ventilation system is to a large degree similar to cross ventilation. The fans are the same, but are now placed in the front wall.

Both sidewalls are provided with adjustable inlet flaps. In principle, the system works the same as for cross ventilation.

d. Tunnel ventilation
This system is similar to length ventilation, only for tunnel ventilation special air inlets are used, that are placed opposite the fans at the other end of the building.

This creates a so-called tunnel effect, as a result of which the air speed inside the building can be 2.0-2.5 m/sec.

This has a positive influence on the wind-chill factor for the animals.

On hot summer days, the wind-chill factor can thus be 6-8 degrees lower. For tunnel ventilation, all other inlets are closed.

e. Cooling system
When a tunnel ventilation system is in place, it is relatively easy to add a cooling system.

For this purpose so-called pads are used. Water is pumped across these pads and fans draw air through them.

The resulting airflow makes the water evaporate and cools down the hot air. This cooler air is then drawn through the building.

Depending on outside temperatures and humidity, the temperature can be lowered by 10-15 degrees.

The pads are mounted inside a housing and placed in front of the tunnel inlets on the outside of the stable.

An even better solution is to provide a small extension that simplifies maintenance and catches any water loss. Excess water is received and recirculated by a water pump.

f. Transition system
Combined systems can be used for great differences between winter and summer temperatures.

Advantages of length/tunnel ventilation versus roof ventilation:

§ lower investment costs

§ lower power consumption

§ lower noise level

§ better options for air conditioning techniques

http://www.abbi-aerotech.com/aawp/?page_id=109

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