Dew Point Calculator Wet Bulb Dry Bulb

Dew Point Calculation:

\[ e = e_{s}^{wb} - 0.00066 \times (1 + 0.00115 \times Wb) \times (T - Wb) \times P_{sta} \] \[ T_d = \frac{243.5 \times \ln(e / 6.112)}{17.67 - \ln(e / 6.112)} \]

Dew Point Temperature (Td):

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1. What is Dew Point Temperature?

The dew point temperature is the temperature to which air must be cooled to become saturated with water vapor. It's a measure of atmospheric moisture and indicates the temperature at which dew or frost will form.

2. How Does the Calculator Work?

The calculator uses the following equations:

\[ e = e_{s}^{wb} - 0.00066 \times (1 + 0.00115 \times Wb) \times (T - Wb) \times P_{sta} \] \[ T_d = \frac{243.5 \times \ln(e / 6.112)}{17.67 - \ln(e / 6.112)} \]

Where:

\( e \) — Vapor pressure (hPa)
\( e_{s}^{wb} \) — Saturation vapor pressure at wet bulb (hPa)
\( Wb \) — Wet bulb temperature (°C)
\( T \) — Dry bulb temperature (°C)
\( P_{sta} \) — Station pressure (hPa)
\( T_d \) — Dew point temperature (°C)

Explanation: The first equation calculates vapor pressure from wet and dry bulb temperatures, then the second equation converts this to dew point temperature.

3. Importance of Dew Point Calculation

Details: Dew point is crucial in meteorology, HVAC design, industrial processes, and agriculture. It helps predict fog, frost, and human comfort levels.

4. Using the Calculator

Tips: Enter wet bulb and dry bulb temperatures in °C, and station pressure in hPa. All values must be valid (pressure > 0).

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between dew point and wet bulb temperature?
A: Wet bulb temperature is the lowest temperature air can reach by evaporative cooling, while dew point is the temperature at which air becomes saturated.

Q2: What is a comfortable dew point range?
A: Below 16°C (60°F) is comfortable, 16-18°C (60-65°F) is somewhat humid, above 18°C (65°F) is uncomfortable.

Q3: Why is station pressure important?
A: Pressure affects the relationship between temperature and humidity. The calculation requires local station pressure for accuracy.

Q4: Can I use this for high altitude calculations?
A: Yes, as long as you use the correct station pressure for your altitude.

Q5: What's the saturation vapor pressure formula?
A: \( e_s = 6.112 \times \exp\left(\frac{17.67 \times T}{T + 243.5}\right) \) where T is temperature in °C.