As the Moisture Content of wood drops below the Fiber Saturation Point (FSP), it will continue...
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As the Moisture Content of wood drops below the Fiber Saturation Point (FSP), it will continue to lose moisture until it eventually stabilizes at a value that is commensurate with the local surrounding moisture in the air. This is known as the point of equilibrium moisture content, or simply EMC. The EMC will change based upon the fluctuating temperature and relative humidity of the surrounding air. The following plot is of EMC versus %RH. • There is a noticeable increase in the slope of the line, especially in the 85% to 100% RH range. This means that wood will swell to a significantly greater extent if it is exposed to prolonged humidity in excess of 85% RH. • Conversely, the line is somewhat flatter in the range of 20% to 55% RH. Humidity changes that happen in this window have a slightly gentler effect on EMC, and hence results in smaller amounts of shrinking and swelling of the wood. 3. 10 20 30 40 50 60 70 80 90 100 Relative Humidiry (a 70 F) Equilibrium Moisture Content a) Using the Psychometric Chart, determine the range of wet bulb temperatures, which correspond to the 20% to 55% RH for the above %EMC curve. The above relative humidity's are measured at 70°F dry bulb. (see plot & two points are required) b) How much water is absorbed or lost, per 100lbs of dry wood, between the two EMC's discussed above? 35 40 160 45 140 50 120 60 70 100 80 90 80 0 SHR 40 s0% dt 30 40 60 70 100 35 37 9 41 ग । 21 23 25 27 145 As the Moisture Content of wood drops below the Fiber Saturation Point (FSP), it will continue to lose moisture until it eventually stabilizes at a value that is commensurate with the local surrounding moisture in the air. This is known as the point of equilibrium moisture content, or simply EMC. The EMC will change based upon the fluctuating temperature and relative humidity of the surrounding air. The following plot is of EMC versus %RH. • There is a noticeable increase in the slope of the line, especially in the 85% to 100% RH range. This means that wood will swell to a significantly greater extent if it is exposed to prolonged humidity in excess of 85% RH. • Conversely, the line is somewhat flatter in the range of 20% to 55% RH. Humidity changes that happen in this window have a slightly gentler effect on EMC, and hence results in smaller amounts of shrinking and swelling of the wood. 3. 10 20 30 40 50 60 70 80 90 100 Relative Humidiry (a 70 F) Equilibrium Moisture Content a) Using the Psychometric Chart, determine the range of wet bulb temperatures, which correspond to the 20% to 55% RH for the above %EMC curve. The above relative humidity's are measured at 70°F dry bulb. (see plot & two points are required) b) How much water is absorbed or lost, per 100lbs of dry wood, between the two EMC's discussed above? 35 40 160 45 140 50 120 60 70 100 80 90 80 0 SHR 40 s0% dt 30 40 60 70 100 35 37 9 41 ग । 21 23 25 27 145
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Related Book For
Elementary Principles of Chemical Processes
ISBN: 978-0471720638
3rd Edition
Authors: Richard M. Felder, Ronald W. Rousseau
Posted Date:
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