3M 46, 44 user manual Thermal Comfort

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Measurements

Thermal Comfort

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”.