Ventilation of livestock barns

To maintain a suitable environment in a livestock facility, it is necessary to consider the following parameters: temperature, air humidity, air speed, and air quality.

The values of these parameters will depend on each animal species, their size, and whether they are young or adult. In this case, we will provide general guidelines for livestock operations.

One very important point that often causes confusion is the difference between ventilation and cooling. Many people think these two terms mean the same thing, but that is not the case.

Ventilation means renewing the air and should always be done to avoid high concentrations of harmful gases. Cooling, on the other hand, means lowering the temperature and should only be done when a certain critical temperature is exceeded.

Forced Ventilation for Poultry Farms

Ventilation for poultry houses follows the same principles as ventilation for horses, pigs, or cows described above. However, there are some differences in air ventilation due to the type of facilities, the size of the hens, and the gases they produce.

To achieve good ventilation, it is important to distinguish between winter and summer ventilation:

• Winter ventilation: Minimum ventilation should be maintained to remove harmful gases from the facility.
• Summer ventilation: Ventilation should be increased to remove harmful gases and evacuate excess heat. Additionally, cooling devices should be used to maintain an optimal temperature for the animals.

Farm ventilation can be achieved through two methods:

• Natural ventilation: This is an ineffective method suitable only for small facilities, as the air renewal is poor. Furthermore, good facility design is required to achieve natural ventilation, and it cannot cope with sudden temperature changes.
• Mechanical or dynamic ventilation: This is the most commonly used and far more effective than natural ventilation. Ventilation is carried out by circulation fans that enable a greater air exchange.

To ensure good ventilation, clean air must be introduced from the top and air extraction should be done from the lower part of the facility.

Poultry fans can be classified by their diameter, as a larger diameter allows for a greater airflow capacity.

The required airflow for good ventilation will depend, among other factors, on the respiratory rate of each type of animal.

Cooling Systems for Industrial Buildings

There are two types of ventilation for large industrial buildings:

• Depression ventilation: This is the most commonly used ventilation system. It consists of allowing fresh air to flow from the upper part of one end of the building and extracting the indoor air through fans located at the lower part at the other end. This allows the air to travel from one end to the other, effectively renewing the air. Its advantages are:
  • Low airspeed, so it does not create harmful drafts for the animals.
  • Better evacuation of harmful gases.
  • Lower installation cost.
• Overpressure ventilation: In this ventilation system, the air enters from the upper part through a fan and is extracted through vents located at the lower part. Its advantages are:
  • Better control over the amount of clean air that is introduced.
  • The outside weather doesn’t matter, as the required airflow can be introduced.
  • The incoming air can be heated or cooled.
  • Easier distribution of air within the building.

Ventilation is not always sufficient. If the interior temperature of the building needs to be lowered, it is necessary to air-condition the industrial building.

Ventilation for Winemaking Facilities

In winemaking facilities, it is essential to maintain a controlled environment for the proper preservation of wine. An adequate ventilation system helps maintain temperature, humidity, and air quality within ideal limits.

Ventilation must be controlled to avoid the accumulation of carbon dioxide and other gases. Additionally, the entry of dirty air should be prevented, as it could alter the wine’s flavor.

The fans used must be capable of generating a constant airflow without causing temperature fluctuations, which could negatively affect the product’s quality.

Ventilation for Greenhouses

Another facility where ventilation can also be used is in greenhouses. The ventilation is very similar to the ventilation used in industrial buildings, but it must be adapted to the needs of the cultivated plants.

For ventilation in greenhouses, it is necessary to install air circulators for greenhouses. The use of cooling systems for greenhouses should also be considered in case the cultivated plants require it.

Another option is to install misting systems to increase the humidity level in the air. This system consists of emitting small water droplets inside the greenhouse, which will generate humid air.

When using these types of systems, it is important to properly control the dew point to avoid excessive water vapor production.

Warehouse Ventilation

Warehouse ventilation will depend greatly on the use or the products being stored. As a general rule, the installation of ceiling fans with light or even the use of portable fans in small warehouses will usually be sufficient.

The most common solution for warehouse ventilation is the use of industrial fans. However, to achieve a comfortable average temperature inside the warehouse, evaporative coolers can be used, which will lower the temperature to the appropriate level through water vapor, saving energy compared to other cooling systems. The amount of vapor emitted will depend on the cooling needs of the warehouse.

For example, in a cleaning products warehouse, it is very important to ensure the quality of the indoor air due to the emission of gases from these products.