ONORM EN ISO 7730:2025

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 7730:2025)

This International Standard specifies a standardized procedure for assessing the overall thermal comfort of persons in a room, as well as the degree of discomfort (thermal dissatisfaction) of persons exposed to a moderate ambient climate. It provides specifications for the analytical determination and interpretation of thermal comfort using the calculation of PMV (predicted mean vote) and PPD (predicted percentage of dissatisfied), and based on criteria for local thermal comfort. It specifies the environmental conditions considered acceptable for overall thermal comfort and the environmental conditions under which local discomfort occurs. This International Standard applies to healthy men and women exposed to an indoor climate intended to produce thermal comfort, but where moderate deviations from a state of thermal comfort occur during the design of new environments or the evaluation of existing ones. Although this standard was specifically developed for the workplace, it can also be applied to other types of environments. For individuals with special needs, such as those with physical limitations, ISO 28803 should be applied. Ethnic, national, or geographical differences should also be taken into account, particularly in the case of non-air-conditioned spaces. Guidance is provided in sections 8 and 10 of the ISO DTR XXXXX guideline.