ISO 10293-1997 PDF

Full title and description

ISO 10293:1997 — Glass in building — Determination of steady-state U values (thermal transmittance) of multiple glazing — Heat flow meter method. This International Standard specifies a laboratory measurement method using a heat flow meter to determine steady-state U values (thermal transmittance) of multiple (insulating) glazing units with flat, parallel surfaces; structured surfaces may be considered flat for the purpose of the method.

Abstract

ISO 10293:1997 defines the heat-flow-meter test procedure for measuring the steady-state thermal transmittance (U value) of multiple glazing assemblies. It covers specimen preparation, environmental and boundary conditions, heat flux and temperature measurement, and calculation of the resulting U value for the glazing element.

General information

• Status: Published (International Standard; subsequently subject to periodic confirmation/review).
• Publication date: February 1997.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 81.040.20 (Glass in building).
• Edition / version: Edition 1 (1997-02).
• Number of pages: 7 pages.

Key bibliographic and status data above are taken from the ISO catalogue entry for ISO 10293:1997.

Scope

Applies to laboratory determination of steady-state U values for multiple glazing units (insulating glass units) using a heat flow meter apparatus. The method is intended for flat, parallel glazing specimens; certain structured surfaces may be treated as flat for testing. The standard is focused on the glazing element itself rather than whole-window or frame-including assemblies and provides measured U values that can be used for performance comparison, certification, or as input data for energy calculations.

Key topics and requirements

• Heat flow meter measurement technique for steady-state thermal transmittance (U value).
• Specimen selection, conditioning and mounting to ensure representative thermal contact and steady-state conditions.
• Instrumentation requirements: heat flux transducers, temperature sensors and data acquisition with specified accuracy and stability.
• Environmental and boundary conditions (hot/cold side temperatures, edge effects) and procedures to reach steady state.
• Calculation procedures and correction factors needed to derive the U value from measured heat flux and temperature differences.

These topics reflect the standard test method and common test-laboratory requirements for glazing thermal performance measurement.

Typical use and users

Used by independent test laboratories, glass and insulating-glass manufacturers, building energy modelers, certification bodies and regulatory authorities to obtain measured U values for multiple glazing units. The measured U values support product performance claims, compliance testing, research into glazing thermal performance, and inputs to whole-building energy compliance and simulation.

Related standards

Standards closely related to ISO 10293 include other test methods and calculation standards for glazing and fenestration thermal performance, for example the guarded hot‑plate / hot‑plate method for glazing (ISO 10291 series) and calculation standards such as ISO 10077 (window and door thermal performance calculation parts) and regional/EN standards for glazing U-value determination. These deliver complementary methods (laboratory measurement vs. calculation) and are commonly cross-referenced in national standards lists.

Keywords

U value, thermal transmittance, insulating glazing, multiple glazing, heat flow meter, heat flux, glazing test method, steady-state thermal measurement.

FAQ

Q: What is this standard?

A: ISO 10293:1997 is an ISO test method that specifies how to measure steady-state thermal transmittance (U value) of multiple glazing units using a heat flow meter.

Q: What does it cover?

A: It covers specimen preparation and mounting, required instrumentation (heat flux transducers and temperature sensors), environmental conditions to achieve steady state, measurement procedures, and calculation of U values for multiple glazing.

Q: Who typically uses it?

A: Manufacturers of insulating-glass units, independent test laboratories, certification bodies, researchers, and building-energy professionals who need measured U values for product comparison, certification, or inputs to energy models.

Q: Is it current or superseded?

A: ISO 10293:1997 is a published International Standard. ISO catalogue records show it as the 1997 edition and indicate it has been subject to the ISO review/confirmation cycle; users should check the ISO catalogue or national standards bodies for the very latest status or any subsequent revisions or replacements before relying on it for regulatory compliance.

Q: Is it part of a series?

A: It sits alongside related ISO standards for glazing thermal performance (for example ISO 10291 hot‑plate methods and ISO 10077 calculation standards) and is frequently referenced together with national/EN standards addressing glazing and fenestration U values.

Q: What are the key keywords?

A: U value, thermal transmittance, heat flow meter, insulating glazing, heat flux, glazing test method.