Shown as curved lines. The 100% RH line is known as the Saturation Curve .
Located on the vertical axis (y-axis). It measures the actual weight of water vapor per pound (or kg) of dry air.
The temperature at which water vapor begins to condense into liquid. It is found by moving horizontally from a state point to the saturation curve. psychrometric chart
The Psychrometric Chart: A Practical Guide to Understanding Air
Diagonal lines that indicate how much space one pound of dry air occupies. Why the Chart Matters in the Real World 1. HVAC Design Shown as curved lines
The psychrometric chart is the cornerstone of atmospheric science. While digital calculators and apps are common today, understanding the chart remains a fundamental skill for anyone working with air. It turns the invisible properties of the atmosphere into a visible, manageable map.
When designing an air conditioning system, engineers must calculate how much energy is needed to cool a room. The psychrometric chart allows them to see how much water will condense out of the air (dehumidification) as the temperature drops, ensuring the equipment is sized correctly. 2. Preventing Mold and Condensation It measures the actual weight of water vapor
By knowing just two properties of an air sample (such as dry-bulb temperature and relative humidity), you can use the chart to pinpoint a specific state point and find every other property of that air. The Anatomy of the Chart: Key Parameters
Located on the horizontal axis (x-axis). This is the temperature we measure with a standard thermometer.