High-velocity, low-speed fans placed every 80 feet mix air and bring it down. Looking up to the roof, an overshot ridge allows warm air to escape the barn, and a controllable vertical curtain prevents precipitation and snow from entering. To enclose the barn, a curtain is lowered to cover the fans from the outside. When it dips below 10✯, the exhaust is reduced down to four continuous air exchanges per hour, which is sufficient for successfully preventing manure from freezing in the barn. At 68 THI, the curtains automatically close and fans turn on to create positive ventilation, with an air exchange rate of 40 exchanges per hour at 70✯, building up to 60 exchanges per hour by 80✯.
The curtains are open and no fan power is needed. When the temperature-humidity index (THI) is under the heat stress threshold, the design leverages the advantages of natural ventilation. “We are not blowing the soaking water onto the feed,” Jones adds. No fans are placed over the feeding area. Angled at 22 degrees, the fans blow onto the cows as they rest in head-to-head beds, and the air stream carries all the way to cool the backs of cows in the feed lane. The ratio is one fan for every four stalls. The arrangement includes 3-foot-diameter fans placed every 10 feet, running both lengths of a four-row freestall barn with 16-foot sidewalls.
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