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velocities might require adjustments to the kiln conditions because of the more turbulent manner in which air interacts with lumber surfaces, but that’s not because the wet bulb readings are inaccurate. WET AND DRY BULB LOCATIONS. The placement of your wet bulb is important. First of all, put it in a location that’s easily seen and accessible for maintenance. Make sure it’s exposed to the main air flow and not tucked away behind a beam or too close to the wall or a piece of equipment. Ideally you’d like to put the dry bulb thermometer in the warmest part of your kiln (if you can locate it), but don’t put it directly in front of a heated air stream because that won’t be representative of the actual kiln temperature. Putting both the wet bulb and dry bulb thermometers on brackets to keep them away from the wall is a good idea; for one thing, the temperature measurements will be less affected by the heat radiating from the kiln wall, and you’ll be more likely to get good air flow over your wet bulb thermometer. WET BULB MAINTENANCE. Here are a few common-sense things you can do to get the most accurate wet bulb readings: 1. Check the wet bulb wick prior to every load. Keep it clean and change it often– dirty wicks will not evaporate water properly, and this can lead to inaccurate wet bulb readings. Wet bulb temperatures are affected by both heat and mass (water vapor) transfer, so less evaporation will mean less cooling of the wick and a perception that your kiln is running at a higher RH than it is. Very dirty wicks may not even wick water from the reservoir efficiently. 2. Use distilled water whenever possible to minimize mineral buildup, and be sure that the wick completely covers the thermometer bulb. 3. Be sure your water reservoir is full (otherwise your wick might not stay wetted throughout the drying run.) 4. Be sure that there aren’t any obstructions or barriers in the way of the air surrounding your WB thermometer so it can read as accurately as possible. 63PDF Image | HARDWOOD DRY KILN OPERATION A MANUAL FOR OPERATORS OF SMALL DRY KILNS
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