The dewpoint temperature when the relative humidity is 30% and the air temperature is 20°C is determined as 2°C.
What is dew point temperature?
The dew point temperature is the temperature at which air must be cooled to become saturated with water vapor.
The dew point temperature is calculated as follows;
[tex]N = \frac{[ln(R_H/100) + [\frac{17.27T}{237.3 + T} ]}{17.27} \\\\N = \frac{[ln(30/100) + [\frac{17.27\times 20}{237.3 + 20} ]}{17.27}\\\\N = 0.00807\\\\D = \frac{237.3N}{1-N} \\\\D = \frac{237.3 \times 0.00807}{1-0.00807} \\\\D = 1.93 ^0C \ \approx 2\ ^0C[/tex]
Thus, the dewpoint temperature when the relative humidity is 30% and the air temperature is 20°C is determined as 2°C.
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