Ventilation systems which circulate air within dairy barns can account for a large portion of an electricity bill. Some estimate they may account for 20-25% of the total electricity usage, especially when barns are mechanically ventilated.
Even with rising costs for electricity, the use of circulation fans for increased air speed are a necessary expense to reduce heat stress and to prevent the associated decreases in milk production, reproductive performance, and performance of future generations.
When temperatures are greater than 18ºC, fans are needed to move air to help cool the cows. The goal during the warmer months of the year is to exchange the air in these facilities 40 to 60 times per hour with the air moving at the rate of 6 to 8 kph at the level of the cow.
Poor or inadequate fan maintenance can decrease the overall airflow by fans as well as the efficiency of these motors by as much as 40%, unnecessarily increasing electricity bills. As little as 3 mm of dust on the fan blades can decrease the efficiency of the motor.
Maintenance on fans should be completed not once, but 3-4 times per year.
Source: University of Kentucky, College of Agriculturehttps://www.ca.uky.edu/