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FACTORS THAT AFFECT THE DRYING RATE: TEMPERATURE, RH AND AIR FLOW The dry bulb temperature, relative humidity and the air flow all interact to influence the drying rate. Here’s a table to help keep things organized: Table 5. Effects of temperature, relative humidity and air flow on the drying rate Temperature RH Air Flow Increased drying rate, more uniform drying, More warp, strength loss results in checks, honeycomb. Higher temperatures increase color change in white woods (ash, basswood, hard & soft maple, sap yellow-poplar) Faster drying, more checking, more uniform drying Less warp (wood stays flatter), less risk of discoloration Faster drying at high MCs (above 30-40%), more uniform RH and more uniform drying in the stack Under 20% MC, you can put the sample boards just about anywhere because air flow won’t affect the drying. AIR FLOW ON AIR DRYING YARDS. Airflow affects all stages of drying, even air drying, and the climate where you’re located might affect how you handle your air drying yard. Consider the area surrounding The Dalles, a city in Oregon: the summers there are breezy, warm and dry. These conditions can cause lumber to dry too quickly, and sometimes it’s desirable to slow things down. To do this, stacks of drying lumber might be moved closer together there than they would be in an area with less wind and more humidity. 58PDF Image | HARDWOOD DRY KILN OPERATION A MANUAL FOR OPERATORS OF SMALL DRY KILNS
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