Description

Circulation Fan (Fan Sirkule)

Circulation fans play a crucial role in maintaining uniform temperature and air distribution in greenhouses. Here’s a summary of their purpose and benefits:

Overview

• Localized Heating with Heaters: Heaters often provide localized heating, which might not always require all units to be turned on. Circulating air using fans ensures temperature uniformity throughout the greenhouse.
• Interaction with Cooling Pads: When the fan and pad system operates, a consistent airflow moves from the pad to the fan, rendering circulation fans inactive. In all other situations, circulation fans are activated.

Key Benefits of Air Circulation

1. Gas Exchange: Improves gas exchange at leaf surfaces.
2. Photosynthesis and CO₂ Absorption: Facilitates better plant growth.
3. Moisture Prevention: Reduces humidity and fungal diseases.

This airflow system is known as Horizontal Air Flow (HAF), widely recognized by greenhouse operators as the circulation fan system.

When Do Circulation Fans Operate?

• Active in non-cooling-pad scenarios to maintain uniform temperature.
• Deactivated when fan-and-pad systems are in use to create a direct airflow.

Optimal Airflow Rates

• Wind Speed at Plant Surface:
  • Should exceed 0.2 m/s but remain below 1 m/s.
  • Optimal recommended range: 0.5–0.7 m/s.
  • Note: Wind speeds over 4.5 m/s can damage plant leaves.

For more detailed calculations on the required number of circulation fans, you may refer to educational resources on greenhouse airflow system calculations.