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Thermal Comfort
9
Thermal Comfort
Thermal comfort readings for indoor environments are a benefit of Detection
Management Software (DMS) and are not displayed or printed from the instrument
directly. Readings are derived from the dry bulb, relative humidity, mean radiant
temperature, airflow, and user entered parameters of clothing, metabolic rate and
external work.
Thermal comfort indices, Predicted Mean Vote (PMV) and Predicted Percent
Dissatisfied (PPD), help predict the thermal satisfaction level of a person with their
indoor environment. The PMV is a rating scale of +3 to -3 where +3 is much to
warm, -3 is much too cool, and 0 is thermally neutral. The PPD reflects what percent
of people in a given location would be dissatisfied with their thermal surroundings.
The formulas used by DMS to derive the PMV and PPD come from the international
standard ISO 7730 “Moderate thermal environments - Determination of the PMV and
PPD indices and specification of the conditions for thermal comfort”.