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Wet-Bulb Depression The difference between the dry-bulb temperature and the wet-bulb temperature is the depression. Many of the dry kiln schedules give a dry-bulb temperature and a depression, rather than a dry-bulb temperature and an RH. Entering Air and Leaving Air As air moves through a stack of drying lumber, the air will cool and the RH will rise. To distinguish the different sides of a load, the side where the air enters the load is called the entering air side and the other side is therefore the leaving or exiting side. As the air conditions on the entering side are the hottest and the driest, meaning the most severe for drying, it is these conditions that MUST be monitored and controlled during drying (rather than the leaving air side). It is the entering air temperature and entering wet-bulb temperature (or depression) that is stipulated in a drying schedule. With respect to air velocity, what goes into the stack must also come out. So, because it is generally easier and more reliable, the velocity is measured on the exit side. 19PDF Image | Principles and Practices of Drying Lumber
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