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Posts posted by Js Cantrell
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thank you ajpoolshark:)
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Bueller? Bueller? Anyone?
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Hi, I joined the forum to ask a question that I can't find the answer to on the web. I'm looking for a formula to precisely answer the following question: an air mass with 34% Relative Humidity (RH) and 84°F = what RH if that air is cooled to 72°F?
For example, in a basement. I know the Rule of Thumb : Relative humidity doubles with each 20 degree (Fahrenheit) decrease, or halves with each 20 degree increase in temperature, but is there an easy formula to answer precisely? Thanks!
relative humidity and temp change formula?
in Spring Weather Discussion
Posted · Edited by Js Cantrell
Awesome! Thank you Nick L. You're right, the math beyond me, but the calculator is just what I was looking for. But I wouldn't have known how to use it if you hadn't explained that I need to derive dew point and then plug it back in. Perfect! Cheers!
My reason for asking is I wanted to know what happens when warm, dry outside air is drawn into a long, narrow, cool basement (20' x 200') at one end with an intake fan while the existing basement air is evacuated with an exhaust fan at the other end. I have humidistats/thermometers throughout, and once the air exchange is complete, I turn off all fans. My goal is to reduce humidity in the basement, but I don't want it too hot down there either, so on those rare summer days here in Tennessee when we get low RH and moderate temp outside, I suck in outside air to help the dehumidifiers keep the basement dry. The basement has concrete floor, ceiling, and walls, so the drawn-in air gets cooled down. The calculator will help me determine when I should and shouldn't ventilate! The rule of thumb I mentioned is ok, but something in me, curiosity I guess, just wanted to know a bit more. Thanks!