1. What Is Psychrometric Analysis?

Psychrometric analysis involves studying the thermodynamic properties of gas-vapor mixtures, particularly air-water vapor systems. This calculator estimates how relative humidity changes when temperature is altered while maintaining constant absolute humidity.

2. How The Calculator Works

The calculator uses psychrometric principles based on the relationship between temperature, vapor pressure, and relative humidity:

Where:

• \( RH \) — Relative Humidity (%)
• \( e \) — Actual Vapor Pressure (hPa)
• \( e_s \) — Saturation Vapor Pressure at given temperature (hPa)

Explanation: When temperature changes while absolute humidity remains constant, the relative humidity changes inversely with the saturation vapor pressure.

3. Importance Of Humidity Calculation

Details: Understanding humidity changes with temperature is crucial for HVAC design, agricultural applications, industrial processes, and maintaining comfortable indoor environments.

4. Using The Calculator

Tips: Enter initial temperature and relative humidity, then the final temperature. The calculator estimates the resulting relative humidity and provides a qualitative assessment of the humidity level.

5. Frequently Asked Questions (FAQ)

Q1: Why does relative humidity change with temperature?
A: Warmer air can hold more moisture, so when temperature increases without adding moisture, relative humidity decreases, and vice versa.

Q2: What is the difference between relative and absolute humidity?
A: Relative humidity is percentage of moisture relative to maximum capacity at current temperature. Absolute humidity is the actual amount of water vapor in the air.

Q3: How accurate is this estimation?
A: This provides a reasonable estimation for typical environmental conditions. For precise calculations, detailed psychrometric charts or more complex equations should be used.

Q4: What applications use this calculation?
A: HVAC system design, meteorology, agricultural planning, industrial drying processes, and indoor climate control.

Q5: Why does relative humidity increase at night?
A: As temperature drops overnight, the air's moisture-holding capacity decreases, causing relative humidity to increase even though absolute humidity remains constant.