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TECHNICAL TOOL / 03

Surface condensation risk check

Compare a measured surface temperature with the air dew point. Add instrument uncertainty and a project-defined temperature margin to produce a conservative screening result.

INPUTS

Measurement uncertainty and project margin

Enter the uncertainty stated for the actual instruments and measurement method. The project margin is user-defined; this tool does not prescribe one universal safe value.

CALCULATED RESULTS

Screening result —

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Nominal dew / frost point
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Nominal surface margin
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Conservative dew / frost point
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Conservative surface margin
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Surface temperature required for entered margin
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METHOD AND BOUNDARY

Conservative uncertainty check

The conservative case raises air temperature and RH by their entered uncertainty and lowers surface temperature by its uncertainty. The resulting margin is compared with the project value entered above.

Instantaneous screening, not a transient model

The calculation represents the entered moment. It does not predict future weather, door opening, infiltration, thermal bridges, night cooling, start-up cycles, material heat capacity, or hidden local cold spots.

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

OTHER TECHNICAL TOOLS

Continue with another calculation

TECHNICAL TOOL / 01 Dew-point calculator → TECHNICAL TOOL / 02 Moist-air property converter →

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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