Overview
SIST EN ISO 14505-2:2007 (Ergonomics of the thermal environment - Evaluation of thermal environments in vehicles - Part 2: Determination of equivalent temperature) is an international standard developed by CEN and ISO. This part of the ISO 14505 series focuses on providing standardized guidelines for assessing the thermal environment inside vehicles by determining the equivalent temperature. The procedures may also be applied to other confined spaces with asymmetric thermal conditions, making the standard relevant for a wide range of industries prioritizing occupational health, comfort, and safety.
Equivalent temperature serves as a unified, physical parameter that integrates the effects of convective and radiative heat exchange on the human body, offering an objective measure of perceived thermal comfort in enclosed environments such as car cabins or similar spaces.
Key Topics
- Definition and role of equivalent temperature: Understanding the integration of radiation and convection in evaluating thermal comfort for occupants.
- Whole body and local assessments: Procedures for measuring thermal conditions that affect the entire body or specific body segments using manikins and sensors.
- Measurement methodology: Requirements for instruments, calibration, and assessment principles for achieving reliable results.
- Assessment in asymmetric climates: Special consideration for non-uniform thermal environments typical in vehicles and other compact spaces.
- Application to HVAC-system performance: Methodology selection for testing heating, ventilation, and air-conditioning (HVAC) systems in vehicles, ensuring thermal comfort during travel.
Applications
SIST EN ISO 14505-2:2007 is primarily used in:
- Automotive Industry:
- Assessment and optimization of in-cabin thermal comfort for drivers and passengers.
- Benchmarking and testing of HVAC performance during vehicle development.
- Other Confined Spaces:
- Evaluation of occupational environments in cabins of construction, agricultural, or industrial vehicles.
- Application in spaces such as control rooms, aircraft cockpits, or maritime compartments where thermal conditions can be irregular.
- Product Certification and R&D:
- Development of ergonomic and comfort standards for new vehicle models.
- Inclusion in product testing, certification schemes, and compliance with international standards.
- Workplace Safety and Health:
- Monitoring comfort to reduce the risk of heat-related stress or discomfort, contributing to safer, more productive work environments.
Related Standards
- ISO 14505-1: Principles and methods for assessment of thermal stress in vehicles.
- ISO 14505-3: Evaluation of thermal comfort using human subjects.
- ISO 13731: Ergonomics of the thermal environment - Vocabulary and symbols.
- SAE J2234: (Recommended practice for calculation of area-weighted mean values in the assessment of vehicle environments).
Practical Value
By applying SIST EN ISO 14505-2:2007, organizations benefit from a unified, reliable method for assessing thermal comfort within vehicle compartments. The approach supports:
- Objective comparison of thermal environments across different vehicle types and designs.
- Enhanced occupant well-being by ensuring HVAC systems meet thermal comfort requirements.
- Regulatory compliance for vehicle safety and ergonomic guidelines.
- Informed product development driven by standardized testing and measurement of thermal conditions.
Adoption of this standard helps to create comfort-focused, energy-efficient, and health-conscious vehicle interiors, strengthening product value and user satisfaction.
Keywords: SIST EN ISO 14505-2:2007, vehicle thermal environment, equivalent temperature, thermal comfort, HVAC testing, ergonomics, confined spaces, automotive industry, international standard.