Overview
ISO/TR 17772-2:2018 - "Energy performance of buildings - Overall energy performance assessment procedures - Part 2" - is a technical report that provides guidance on using indoor environmental input parameters for building design and energy performance assessment. It supplements ISO 17772‑1 by explaining how to specify indoor environmental criteria for the thermal environment, indoor air quality (IAQ), lighting and acoustic conditions, and how to use those criteria in energy calculations, monitoring and long‑term evaluation.
Key topics and requirements
- Scope and applicability
- Applies where indoor environment criteria are driven by human occupancy and where production or process loads do not dominate indoor conditions.
- Explains categories of criteria that can be adapted for building type, occupant type, climate and national differences.
- Design input criteria
- Guidance for establishing input parameters used to dimension heating, cooling, ventilation and lighting systems.
- Separate treatment of mechanically conditioned buildings, naturally ventilated buildings, increased air velocity and personalized systems.
- Indoor air quality and ventilation
- Methods for specifying ventilation rates for residential and non‑residential buildings.
- Consideration of filtration, air cleaning and access to operable windows.
- Lighting, humidity and noise
- Recommendations for lighting input parameters, humidity control and indoor noise criteria for energy assessments.
- Energy calculation inputs
- How to adopt indoor environmental parameters for seasonal, monthly and hourly/dynamic building simulations.
- Evaluation and long‑term indicators
- Methods for long‑term evaluation of indoor environment from calculations or measurements, including hourly criteria, degree‑hours and weighted comfort indices.
- Measurements and inspections
- Criteria for in‑situ measurements to verify compliance by inspection and guidance for monitoring and displaying indoor environmental data.
- Informative annexes
- Includes annexes with recommended thermal criteria, IAQ basis, lighting examples, noise criteria, occupant schedules, monitoring methods and links to WHO health criteria.
Applications and who uses it
ISO/TR 17772-2:2018 is intended for:
- Building designers and HVAC engineers specifying system setpoints and ventilation strategies
- Energy modelers and simulation specialists selecting indoor environment inputs
- Facility managers and building owners monitoring performance and occupant comfort
- Certification bodies and inspectors verifying compliance by measurements
- Policy makers defining national or regional criteria for building performance
Practical uses include setting input assumptions for energy simulations, defining monitoring parameters for building dashboards, preparing inspection protocols and aligning occupant comfort targets with energy efficiency goals.
Related standards
- ISO 17772‑1 (companion document for overall energy performance assessment procedures)
- Relevant ISO/TC 163 publications and WHO indoor environment health guidance (referenced in Annex N)
Keywords: ISO/TR 17772-2:2018, energy performance of buildings, indoor environmental parameters, indoor air quality, thermal environment, ventilation rates, building energy calculations, lighting, acoustic, monitoring.