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TECHNICAL TOOL / 01

Dew-point calculator

Calculate the temperature at which the entered air state reaches saturation. The result supports condensation checks, low-temperature reviews, and humidity-control discussions.

INPUTS

Below the water triple point, the ASHRAE ice-saturation branch is used; the calculated value is physically a frost point. Relative humidity must come from a suitable, calibrated measurement for the operating range.

CALCULATED RESULTS

Dew / frost point
—
Water-vapour partial pressure
—
Saturation vapour pressure
—
Dry-bulb to dew-point spread
—

METHOD AND BOUNDARY

How this result is calculated

Relative humidity is converted to water-vapour partial pressure. The ASHRAE saturation-pressure equation is then inverted iteratively until the pressure at the calculated temperature matches the entered air state.

What this tool does not decide

A dew point alone does not provide moisture load, equipment capacity, transient surface temperature, leakage, air-change rate, or a safe project margin.

Calculation reference: ASHRAE Handbook—Fundamentals, Chapter 1 ↗ · PsychroLib API ↗

OTHER TECHNICAL TOOLS

Continue with another calculation

TECHNICAL TOOL / 02 Moist-air property converter → TECHNICAL TOOL / 03 Surface condensation risk check →

PROJECT REVIEW

A calculator defines a condition. Equipment selection needs the full operating context.

For a project review, include the enclosure or room, temperature and humidity range, target, moisture source, airflow, power, drainage, controls, quantity, and operating cycle.

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