Air Circulation Control

Adequate air circulation must be provided to ensure thorough mixing of the air inside the greenhouse. This avoids thermal stratification, and increases the temperature uniformity throughout the compartment. Dehumidification and humidification strategies also require good mixing of the air mass since even small variations in temperature can result in large differences in relative humidity and vapor pressure deficit. By maintaining consistent conditions throughout the greenhouse with good air circulation, many plant diseases can be prevented and more uniform crops can be produced.

The Argus system controls the operation of horizontal air flow (HAF) fans and poly tube air distribution systems to optimize air circulation within the growing environment. To save on energy costs, the operation of air circulation fans can be linked to the ventilation rate so that whenever the roof vents or ventilation fans are not operating, or are operating at a low ventilation rate, the internal air circulation fan system will be activated. Using the power or Argus' enhanced equation programs, fan operation can also be influenced by the time of day, the climate temperature, and many other user selectable parameters and conditions.