ISO 13789-2017 PDF

Full title and description

St ISO 13789-2017 — Thermal performance of buildings — Transmission and ventilation heat transfer coefficients — Calculation method. This International Standard specifies a steady‑state calculation method and conventions for determining transmission and ventilation heat transfer coefficients for whole buildings and parts of buildings, applicable to both heat loss and heat gain situations; heated or cooled spaces are assumed to be at uniform temperature.

Abstract

ISO 13789:2017 provides a clear, steady‑state procedure for calculating the transmission (through building envelope) and ventilation (renewal of air) heat transfer coefficients of buildings or parts of buildings. The standard includes conventions for sign and units, applicability to heat loss and heat gain, and an annexed steady‑state method to estimate temperatures in unconditioned spaces adjacent to conditioned spaces. It is positioned within the EPB (energy performance of buildings) modular structure referenced by ISO 52000‑1.

General information

• Status: Published (current edition confirmed on review; replaces the 2007 edition).
• Publication date: 21 June 2017 (Edition 3, 2017‑06).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 91.120.10 (Thermal insulation of buildings / Energy performance of buildings).
• Edition / version: Edition 3 (2017).
• Number of pages: 24 pages (ISO published document length).

Key bibliographic and lifecycle details are recorded in the ISO catalogue entry for ISO 13789:2017; the 2017 edition supersedes the 2007 edition.

Scope

ISO 13789:2017 specifies a method and conventions for calculating steady‑state transmission and ventilation heat transfer coefficients of whole buildings and parts of buildings. It applies where the internal space is assumed to be at a uniform temperature and covers both heat loss (internal temperature higher than external) and heat gain (internal temperature lower than external). Annex C of the standard gives a steady‑state method to estimate temperatures in unconditioned spaces adjacent to conditioned spaces. The standard is intended to fit into the EPB modular framework described in ISO 52000‑1.

Key topics and requirements

• Definitions and conventions for steady‑state transmission and ventilation heat transfer coefficients.
• Calculation method for whole buildings and building parts under uniform internal temperature assumption.
• Applicability to both heat loss and heat gain situations (sign and magnitude conventions).
• Annex C: steady‑state approach for estimating temperatures in adjacent unconditioned spaces.
• Placement within the EPB modular structure (interaction with ISO 52000 series and related EPB standards).

These topics and requirements are drawn directly from the ISO 13789:2017 standard text and its explanatory notes.

Typical use and users

Engineers and consultants calculating building heat losses/gains, energy assessors producing steady‑state metrics, building physicists conducting thermal analyses, certification bodies using EPB modules, regulatory authorities specifying calculation procedures, and manufacturers or test laboratories referencing standardized coefficient definitions for compliance and product information. The standard is typically used during design, compliance checks and energy performance assessments where steady‑state transmission/ventilation coefficients are required.

Related standards

ISO 13789:2017 is part of the EPB (energy performance of buildings) family and is referenced within the modular structure established by ISO 52000‑1 (General framework and procedures). Related and complementary standards include ISO 52017‑1 (sensible and latent heat loads and internal temperatures — generic calculation procedures), and the older ISO 13790 series (calculation of energy use for space heating and cooling), the latter having been superseded in scope by newer ISO 52016/52017 documents. Users should consider these documents when performing broader energy balance, dynamic or hourly calculations.

Keywords

thermal performance; heat transfer coefficient; transmission heat loss; ventilation heat transfer; steady‑state calculation; EPB; building thermal analysis; ISO 13789; energy performance of buildings.

FAQ

Q: What is this standard?

A: ISO 13789:2017 is an International Standard that provides a steady‑state calculation method and conventions for transmission and ventilation heat transfer coefficients of whole buildings and parts of buildings.

Q: What does it cover?

A: It covers definitions, sign and unit conventions, and a calculation procedure for steady‑state transmission and ventilation heat transfer coefficients applicable to both heat loss and heat gain; it also includes an annexed method for adjacent unconditioned space temperatures.

Q: Who typically uses it?

A: Building engineers, energy assessors, building physicists, certification bodies, regulators, and testing laboratories — anyone needing standardized steady‑state coefficients for thermal performance assessments or EPB modular calculations.

Q: Is it current or superseded?

A: The 2017 edition (Edition 3) is the current published edition and supersedes the 2007 edition. The ISO catalogue indicates the 2017 edition as the active document; the standard is subject to periodic review.

Q: Is it part of a series?

A: Yes — ISO 13789:2017 sits within the ISO EPB family (energy performance of buildings) and is referenced in the modular framework of ISO 52000‑1; users should consider related EPB standards (for transient calculations, loads and energy needs) such as ISO 52017‑1 and the ISO 52016 family.

Q: What are the key keywords?

A: Thermal performance, transmission heat transfer coefficient, ventilation heat transfer coefficient, steady‑state calculation, EPB (energy performance of buildings).