ISO/TR 52016-2:2017

Overview

ISO/TR 52016-2:2017 is an informative ISO Technical Report that explains and justifies the calculation approaches given in ISO 52016‑1 and ISO 52017‑1 for the energy performance of buildings. It does not introduce normative requirements; instead it provides background, rationale, worked examples and guidance to support correct use of the hourly and monthly calculation methods for: energy needs and loads for heating and cooling (sensible and latent), internal temperatures, and design heating/cooling loads.

Key topics and technical content

The report organizes and clarifies the methods and assumptions used in ISO 52016‑1 and ISO 52017‑1. Major subjects covered include:

• Scope, terms and definitions, and lists of symbols, subscripts and abbreviations to ensure consistent use of terminology.
• Description of output data: energy needs, hourly and monthly outputs, and peak design loads.
• Hourly calculation procedures (detailed routing of models from inputs to hourly outputs): thermal zoning, heat transfer, internal and solar gains, ventilation, moisture (latent heat) loads, and internal environment thermal capacity.
• Monthly calculation procedures: simplified monthly energy need computations, utilization factors, intermittency corrections and overheating indicators.
• Input data and assumptions: geometrical and thermophysical properties, boundary and operating conditions, and selection templates.
• Zoning and thermal coupling: guidance on zone size, heat exchange between zones and unconditioned spaces.
• Validation, verification and quality control: BESTEST-related verification cases, compliance checks, worked examples and reporting templates (Annexes A & B).
• Annex H (noted) explains the rationale for reorganization of related ISO/CEN standards.

Practical applications

ISO/TR 52016-2:2017 is a supporting document for practical building energy assessment and modeling tasks:

• Interpreting and applying ISO 52016‑1 (hourly and monthly calculation methods) and ISO 52017‑1 (reference hourly method).
• Ensuring consistent inputs and assumptions for energy performance certifications, compliance checks and design studies.
• Guiding development and validation of building simulation software and calculation tools.
• Informing HVAC design for accurate determination of sensible and latent heating/cooling loads and internal temperature predictions.

Who should use this standard

• Building energy modelers and simulation engineers
• HVAC designers and load calculation specialists
• Energy assessors and certification bodies
• Software developers creating compliant calculation tools
• Researchers and policymakers working on building energy performance standards

Related standards

• ISO 52016‑1 (calculation methods for energy needs - hourly and monthly)
• ISO 52017‑1 (reference hourly method) Note: ISO/TR 52016‑2 provides explanation and justification to support correct use of these standards rather than new normative requirements.

Keywords: ISO/TR 52016-2:2017, energy performance of buildings, heating and cooling energy needs, hourly and monthly calculations, sensible and latent heat loads, internal temperatures, ISO 52016‑1, ISO 52017‑1.