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How to Avoid Moisture-Related Problems when Retrofitting Buildings to Improve Energy Efficiency
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The Interaction of Mechanical Systems with the Building Envelope: Addressing Potential and Existing Moisture-Related Problems
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We will postpone the discussion of it until after we learn about the relationship between temperature and saturation vapor pressure, e s. One of the most common indicators of absolute humidity is the dewpoint temperature. On the other hand, cloud formation depends on the relative humidity, although the cloud might be kind of wimpy if the absolute humidity is small. So does the absorption and emission of infrared atmospheric radiation. For example, the density of a moist air parcel depends on the absolute amount of water vapor. Some processes depend upon the absolute amount of water vapor, which is given by the specific humidity, water vapor mixing ratio, and water vapor pressure, and other processes depend on the relative humidity. Note that at saturation, you can replace w with w s and e with e s in the equation that relates w to e. e and e s are typically less than 7% of p, and since e is usually 20%–80% of e s, the difference between the two definitions is usually less than a few percent. E = ρ v R v T, p d = ρ d R d T, ε ≡ R d R v so w = ε e p d = ε e p − e, w w s = e e s ( p − e s p − e ), R H = S ( p − e s p − e ) ε = 0.622 is just the molar mass of water (18.02 kg mol –1) divided by the mass of dry air (28.97 kg mol –1).