Retention Time & Benefits
What is retention time?
Retention time is the duration of time that grain is held in a dryer or drying bin while trying to achieve both targeted moisture content and kernel quality. A Shivvers Performance System, using counter-flow drying, processes the same amount of grain as other drying methods but is able to retain each kernel in the drying bin longer. This not only achieves a more precisely targeted moisture content, it almost eliminates stress on kernels and uses energy much more efficiently.Common cross-flow dryers process grain in depths averaging only 12 to 16 inches, taking from ½ hour to two hours for grain to enter and exit the dryer. In this method, grain is subjected to very high temperatures over a short amount of time and then quickly cooled. The result is more stress cracking. On the other hand, average grain depth using Counter-Flow Drying with a Shivvers Performance System is three to ten feet. On average, a single kernel is allowed 12 hours before exiting the drying bin. Since a larger volume of grain receives the heat inputted into the bin, each kernel is dried more slowly as energy is more fully utilized. The results are dramatically higher test weights with added profit due to less energy usage. Independent test conducted at Michigan State University, Purdue University, and Iowa State University confirm what Shivvers has always known – Counter-Flow Drying is superior to cross-flow drying retaining as much as 2-4 pounds per bushel better test weights. The fact that the process is slower does not mean that the dryer is slower or has less capacity. It just means that more grain is in the dryer exposed to the drying air for a longer period of time.