Psychrometric and duct calculators are fundamental HVAC tools used to determine the properties of air and properly size airflow pathways, respectively. While they address different parts of HVAC engineering—air thermodynamics versus fluid dynamics—they are frequently packaged together in a single software application or handheld tool to streamline system diagnostics and design. How to Use a Psychrometric Calculator
A psychrometric calculator computes the thermodynamic properties of moist air based on a known state point. By entering any two independent air properties, the tool instantly calculates all remaining attributes using standard industry formulas (such as ASHRAE Handbook equations). Key Parameters Explained
Dry-Bulb Temperature (DBT): The air temperature measured by a standard thermometer.
Wet-Bulb Temperature (WBT): Measured by a thermometer with a wet wick; indicates evaporative cooling potential.
Relative Humidity (RH): The percentage of moisture the air holds relative to its maximum capacity at that temperature.
Dew Point (DP): The temperature where air becomes completely saturated and condensation begins.
Enthalpy (H): Total heat content of the air, measured in BTU per pound of dry air (BTU/lb). Step-by-Step Operation Psychrometric Chart + Duct Calculator – FlyCarpet
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