Energy conservation is a critical concern for tea manufacturers, especially when it comes to withering, which is an energy-intensive process. In traditional tea factories, large fans blow air over the leaves continuously for several hours, which can consume a significant amount of electricity. However, modern withering techniques focus on reducing energy consumption without compromising the quality of the tea.
One common energy-saving practice is to switch off one of the fans after the leaves have reached a certain level of withering. In wider troughs, dual axial fans are used to ensure uniform airflow. After the initial withering stage, one fan can be turned off while the other continues to circulate air to prevent the leaves from overheating. This simple practice helps tea factories conserve energy while maintaining leaf quality.
Another energy conservation technique is to adjust the speed of the fans based on the humidity and moisture content of the leaves. For example, during dry weather, lower fan speeds can be used since the air already has a lower moisture content. In contrast, during humid conditions, higher fan speeds may be necessary to remove moisture more effectively.
Some tea factories also utilize reversible air flow systems to reduce energy consumption. By reversing the direction of airflow, these systems can achieve a more even wither without the need for additional fans or equipment. Although reversing fans can reduce efficiency slightly, the overall energy savings can be significant when managed properly.
Additionally, trough design plays a role in energy conservation. Modern troughs are designed to optimize airflow, allowing for more efficient energy use. For example, wider troughs allow for better air circulation, reducing the need for multiple fans or higher fan speeds. Enclosed troughs also help conserve energy by preventing heat loss and ensuring that air is circulated more effectively.