EC centrifugal fans for energy efficiency in agricultural greenhouse ventilation

2025-05-13 10:05:43

EC Centrifugal fans provide excellent energy savings in agricultural greenhouse ventilation, mainly in the following areas:

Precise speed control

The EC centrifugal fan uses electronic speed control technology to accurately adjust the speed of the fan according to changes in environmental parameters such as temperature, humidity and CO2 concentration inside the greenhouse. For example, in the early morning or evening when the temperature is low, when the heat demand inside the greenhouse is low, the fan can automatically reduce its speed and reduce the amount of ventilation to avoid unnecessary heat loss, thus saving energy. When the sunlight is strong and the temperature is high at noon, the fan will automatically increase the speed and ventilation according to the set temperature threshold, effectively lowering the temperature inside the greenhouse and maintaining a suitable growing environment. This precise speed control function enables the fan to adjust its operating status in real time according to actual demand, avoiding over-ventilation or under-ventilation that may occur when traditional fans operate at a fixed speed, thus realising energy saving.

High-efficiency motors save energy

EC centrifugal fans are usually equipped with brushless DC motors, which are energy efficient. Compared to conventional AC motors, DC brushless motors eliminate friction losses between brushes and commutator, and also have better electromagnetic properties, enabling more electrical energy to be converted into mechanical energy and increasing the efficiency of the motor. Typically, the efficiency of a brushless DC motor can reach 85% - 90%, which is a 10% - 20% increase in efficiency compared to a normal AC motor. In agricultural greenhouses, where ventilation equipment needs to run continuously for long periods of time, improved motor efficiency can significantly reduce energy consumption and save money on electricity bills.

Optimised airflow organisation saves energy

The impeller design of the EC centrifugal fan has been optimised to produce a uniform and stable airflow, effectively improving the airflow organisation inside the greenhouse. By reasonably arranging the position and number of fans, the fresh air can be evenly distributed to all corners of the greenhouse, avoiding ventilation dead spots and improving the ventilation effect. At the same time, the optimised airflow organisation can also reduce the airflow short-circuit and reflux phenomenon, reduce the ventilation resistance, so that the fan consumes less energy under the same ventilation requirements. For example, in some large-scale continuous greenhouses, the use of EC centrifugal fans with reasonable vent settings and deflector panels can make the airflow inside the greenhouse smoother and reduce the ventilation energy consumption by 15% - 25%.

Intelligent control saves energy

EC centrifugal fans can be integrated with greenhouse environment monitoring systems and intelligent control systems to achieve intelligent ventilation control. The system can automatically control the start/stop and speed adjustment of the fan according to the preset environmental parameters without human intervention. In addition, some advanced intelligent control systems can also dynamically adjust the ventilation strategy according to weather changes, crop growth stages and other factors to further optimise energy saving. For example, in the high temperature of summer, the system can adjust the operation time and speed of the fan in advance according to the weather forecast, to ensure that the greenhouse ventilation and cooling at the same time, to minimise energy consumption. At different stages of crop growth, according to the different needs of crops for the environment, the ventilation volume and ventilation time are precisely controlled to achieve the best balance between energy saving and crop growth.