EN ISO 7730:2025 PDF

Overview

EN ISO 7730:2025 - "Ergonomics of the thermal environment" specifies a standardised analytical method to evaluate thermal comfort in moderate indoor environments. It defines how to calculate the Predicted Mean Vote (PMV) and the Predicted Percentage of Dissatisfied (PPD), and it sets local thermal comfort criteria (draught, radiant asymmetry, vertical air temperature differences, warm/cool floors). The standard is applicable to healthy men and women and is intended for design and assessment of new and existing spaces where thermal comfort is desirable.

Key topics and technical requirements

• Whole-body thermal comfort: PMV calculation based on human heat-balance and the 7‑point thermal sensation scale (from −3 Cold to +3 Hot).
• Thermal dissatisfaction: PPD derived from PMV to estimate percentage of occupants likely to be dissatisfied.
• Local comfort criteria: Methods and limits to predict dissatisfaction caused by draught, radiant temperature asymmetry, vertical air temperature differences and floor temperatures.
• Non‑steady‑state conditions: Guidance for transients, temperature cycles, ramps and drifts where conditions vary over time.
• Normative references: Integration with measurement and modelling standards such as ISO 7726 (instruments), ISO 8996 (metabolic rate), ISO 9920 (clothing insulation), ISO 10551 (subjective scales), ISO 13731 (vocabulary) and ISO 28803 (special requirements).
• Supporting annexes: Examples of comfort requirements by space type, metabolic rate tables, clothing insulation estimation, a normative computer program for PMV/PPD, graphics, humidity and air velocity guidance.

Practical applications and users

EN ISO 7730:2025 is primarily used to design, evaluate and document indoor thermal environments in workplaces, commercial buildings and other conditioned spaces. Typical users include:

• HVAC engineers and mechanical designers (system sizing, control strategies)
• Building and façade designers (mitigating radiant asymmetry, floor temperatures)
• Facility and energy managers (comfort vs. energy trade-offs)
• Occupational health and safety specialists and ergonomists (workplace comfort assessments)
• Architects and indoor environmental quality consultants
• Researchers developing thermal comfort models and control algorithms

Practical uses include setting design targets (operative temperature, air velocity, radiant conditions), evaluating retrofit performance, validating HVAC control strategies, and producing occupant comfort reports using PMV/PPD metrics.

Related standards

Relevant companion standards commonly used with EN ISO 7730:2025:

• ISO 7726 - Instruments for measuring thermal environment
• ISO 8996 - Determination of metabolic rate
• ISO 9920 - Estimation of clothing insulation
• ISO 10551 - Subjective judgement scales
• ISO 13731 - Vocabulary and symbols
• ISO 28803 - Application to people with special requirements

Keywords: EN ISO 7730:2025, thermal comfort, PMV, PPD, ergonomics, local thermal comfort, operative temperature, HVAC design, indoor environmental quality.