The best suited Air Intake for Pigs

Diffuse ceiling has a range of benefits compared with the traditional air vents. Its characteristic is that the aperture where air passes is constant. Vents open and close with the demand of air. Diffuse ceiling has many designs.

Ceiling with an insulating board with holes is not good, because the negative pressure at minimum ventilation cannot stay at minimum three Pascal.

Ceiling with a fibre cloth with stripes of small holes is not good again because of the lack of negative pressure at minimum ventilation.

Generally a good diffuse ceiling must at maximum (nominal) air flow produce resistance to the air flow, where minimum comes from mineral wool or similar material. Designing with 20-25 Pascal at nominal air flow will guaranty a negative pressure of 2 to 4 Pascal at minimum. The ceiling must distribute the fresh air uniformly.

VengSystem has lab facility to measure all materials which are considered to be used the make a diffuse ceiling.

A diffuse ceiling supplies the fresh air with a very low air speed, less than 0.1 meters per second.

The supplied air has no punch. The mixture of the air is driven by convective air movements, which occurs from small temperature differences.

As a result the air moves very slowly around the animals, which in turn feel warmer. This makes it possible to run the room one to two degrees lower in temperature, which gives a drier room and a better air quality in the cold season. With systems with air vents the air speed around the animals is much higher because the air must enter the room with velocities 20 to 40 times faster than with diffuse ceiling.

When a diffuse ceiling is correctly designed and made you have no heat loss through the insulation. The heat, which goes into the ceiling, comes back with the fresh air, which is slightly preheated. In today’s bigger buildings 80 % of the conductive heat loss comes from the ceiling. The lower heat loss saves heat costs and gives a better environment.

A draw back of the diffuse ceiling is the low air speed around the animals with elevated temperatures. The chilling is not sufficient, productivity goes down and the pen gets dirty. The solution is to add supplementary ceiling vents, which guides fresh air jets down to the animals, when they feel to warm. VengSystem has designed a PC program to optimize the number and size of ceiling inlets.

A further advantage is that you are free to position these ceiling inlets so they match the rows of animals, a great advantage in very wide houses. These advantages are not present if you design ventilation with wall inlets only.

For pig houses the diffuse ceiling with supplementary ceiling inlets for the hot season is the absolute best design, regardless of fully slatted or partly slatted floor.

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