计算湿度参数，如相对湿度、露点、霜点、蒸汽浓度、比湿度、混合比等参数。- 推荐用于 rotronic 产品的湿度计算器。
The PST Rotronic Relative Humidity Calculator is based on the Hyland and Wexler (1983) formula for measuring water vapor pressure over a range of temperatures.
It accurately represents the saturation vapor pressure of water over liquid and solid phases.
The Hyland and Wexler (1983) equation:
ln (Pvap) = A + B / (T + C)
Where:
Pvap is the water vapor pressure in Pascal (Pa).
T is the temperature in degrees celsius (°C).
A, B, and C are constants that vary depending on the water phase (liquid or solid).
The Humidity Calculator is built to focus on Relative Humidity measurement for engineers. Users can also choose between different units and parameter inputs such as dew point, wet-blub temperature, frost point, vapor concentration, and more. It can be used as a standalone tool or in combination with Rotronic humidity products.
Using the PST Rotronic Relative Humidity Calculator is easy. 1) Choose the parameter you want to measure. 2) Enter the temperature and pressure. 3) Select the units in which you want to view your result.
Watch the quick video below demonstrating how to use the PST Rotronic Relative Humidity Calculator.
Relative humidity is the measurement of how close the air (or other gas) is to being fully saturated with water vapor.
It is the ratio of water vapor pressure to saturation water vapor pressure expressed as a percentage.
%rh = (water vapor pressure/saturation water vapor pressure) * 100.0
Learn more about relative humidity and why it is measured for industries.
The PST Rotronic Relative Humidity Calculator is built on the Hyland and Wexler (1983) Water vapor pressure formula, while the PST Michell Dew Point Calculator is built on the Sonntag (1994) Water vapor pressure formula.
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The two formulas differ in their applicable temperature ranges. The Hyland-Wexler formula is suitable for temperatures between -100°C and 0°C, whereas the Sonntag formula is valid for a broader range of temperatures, spanning from -80°C to +50°C. This wider temperature range makes the Sonntag formula more versatile and applicable to a greater variety of situations.
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Humidity indicates moisture in the air, while dew point is the temperature at which moisture condenses. Relative humidity is the percentage of moisture in the air compared to its maximum capacity at a given temperature. These concepts help gauge comfort, condensation, and moisture conditions.
Learn more about these consepts
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