Ergonomics of the thermal environment - Analytical determination and interpretation of thermal comfort using calculation of the PMV and PPD indices and local thermal comfort criteria (ISO 7730:2005)

This document establishes a comprehensive framework for the assessment and interpretation of thermal comfort in indoor environments. It is grounded in the widely accepted principles derived from the Predicted Mean Vote (PMV) and Predicted Percentage of Dissatisfied (PPD) indices. The text provides detailed methodologies for calculating these indices based on specific environmental factors, including air temperature, mean radiant temperature, relative humidity, air speed, and the metabolic rate and clothing insulation of occupants. By utilizing these quantitative measures, the guidance enables engineers and facility managers to evaluate whether a given space provides a satisfactory thermal environment for the majority of people present. It further addresses conditions related to local discomfort, such as drafts, vertical temperature differences, and radiant asymmetry, offering specific criteria to ensure that these factors do not compromise overall comfort. The approach outlined is applicable to various types of occupied buildings where thermal comfort is a priority, serving as a technical reference for design, verification, and measurement activities aimed at optimizing indoor air quality and human well-being without resorting to subjective judgments.