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Author Topic: Heating air to lower RH and EMC  (Read 325 times)

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Offline GeneWengert-WoodDoc

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Heating air to lower RH and EMC
« on: October 17, 2018, 08:02:54 PM »
When heating air, itís relative humidity drops.  Here is a table showing the outside air low temperature, and the RH and EMC when heated to 70 F.

Morningís Low (F)   Humidity at 70 F (%)    EMC at 70 F (%)
0.                               5                                   2
20                             14                                  4
40                             34                                  7
60                             67                                 12

Another way to look at this heating effect is to figure out the amount of heat above the morningís low temperature required to achieve 7% EMC.

Morningís.   Heating (F)     Building Temp (F)
Low (F)
0                   21                         21
20                25                         45
40                27                         67
60                28                         88

Gene - Author of articles in Sawmill & Woodlot and books: Drying Hardwood Lumber; VA Tech Solar Kiln; Sawing Edging & Trimming Hardwood Lumber. And more

Offline curved-wood

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Re: Heating air to lower RH and EMC
« Reply #1 on: October 18, 2018, 08:26:41 AM »
Very usefull info

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