BS EN 1264-5-2021 PDF

Full title and description

BS EN 1264-5:2021 — Water based surface embedded heating and cooling systems. Part 5: Determination of the thermal output for wall and ceiling heating and for floor, wall and ceiling cooling. This part specifies the method to convert or recalculate thermal output values determined in EN 1264-2 (floor heating test/calculation results) into corresponding values for wall and ceiling heating and for cooling applications of floors, walls and ceilings.

Abstract

EN 1264-5:2021 provides the recalculation procedure and characteristic relationships needed to express thermal output for alternative surface orientations and for cooling use, based on the measured or calculated floor-heating results from EN 1264-2. It sets out the calculation method, required test-report elements and reference tables/figures used to determine equivalent heat transmission coefficients and characteristic curves for heating and cooling surface applications.

General information

• Status: Current / Definitive.
• Publication date: 28 May 2021.
• Publisher: British Standards Institution (BSI) — adoption of EN 1264-5:2021 as the British/European document.
• ICS / categories: 91.140.10 (Central heating systems).
• Edition / version: 2021 (revision of the EN 1264-5 series; replaces the 2008 edition).
• Number of pages: Typically published as 11–16 pages depending on adopter; BSI listing shows 14 pages.

Scope

EN 1264-5 applies to water‑based heating and cooling systems embedded in building enclosure surfaces (floors, walls and ceilings) intended for thermal comfort in residential and non‑residential buildings. It specifies the recalculation method that converts thermal output values determined using EN 1264-2 (floor heating calculation and test methods) into equivalent values for other surface orientations and for cooling applications. The standard excludes certain ceiling systems mounted with designed open air gaps that permit thermally induced air circulation; where applicable, references such as EN ISO 11855, EN 14037 and EN 14240 may be used for alternative determinations.

Key topics and requirements

• Recalculation method to convert EN 1264-2 floor test/calculation results into thermal outputs for wall and ceiling heating and for floor/wall/ceiling cooling.
• Definition and use of equivalent heat transmission coefficients (K) and linear characteristic curves (q = K · Δϑ) linking surface thermal output to temperature difference for heating and cooling.
• Normative references and dependencies: EN 1264-1 (definitions and symbols) and EN 1264-2 (floor heating methods and test reports) are normative for Part 5 calculations.
• Requirements for test-report content and annexed tables/figures used in the recalculation procedure.
• Applicability limits and exclusions (e.g., suspended ceilings with designed open air gaps are outside the EN 1264 scope).

Typical use and users

Used by HVAC designers and engineers for system design and performance specification, manufacturers and product testing laboratories for producing certified thermal-output data, certification and compliance bodies verifying declared outputs, and consulting engineers or contractors applying underfloor/wall/ceiling heating and cooling systems in buildings. The standard is applied when converting floor-test results into wall/ceiling performance figures or when certifiable, comparable thermal-output values are required for product datasheets and project calculations.

Related standards

Part of the EN 1264 series; closely related and normatively referenced documents include EN 1264-1 (definitions and symbols) and EN 1264-2 (floor heating: calculation and test methods). For system design and construction see EN 1264-3 and EN 1264-4; types E–G systems are addressed by EN ISO 11855. Alternative/adjunct methods for determining thermal output include EN 14037 and EN 14240.

Keywords

EN 1264-5, BS EN 1264-5, surface embedded heating, surface embedded cooling, underfloor heating, wall heating, ceiling heating, thermal output, recalculation method, heat transmission coefficient, characteristic curve, EN 1264 series, HVAC standards.

FAQ

Q: What is this standard?

A: BS EN 1264-5:2021 is the European/British standard that specifies how to determine and recalculate the thermal output of water‑based surface embedded heating and cooling systems for walls and ceilings, and how to convert floor test/calculation results into outputs for other surface orientations and for cooling applications.

Q: What does it cover?

A: It covers the recalculation procedure, required test‑report elements, use of equivalent heat transmission coefficients and characteristic curves, and the limits of applicability (including exclusions such as certain suspended ceiling arrangements).

Q: Who typically uses it?

A: HVAC designers, test laboratories, product manufacturers, certification bodies, and contractors or consultants who need certifiable, comparable thermal output data for embedded heating and cooling systems.

Q: Is it current or superseded?

A: The 2021 edition is the current/revision edition and supersedes the earlier EN 1264-5:2008 edition; users should reference the 2021 text for the latest recalculation method and normative references.

Q: Is it part of a series?

A: Yes — it is Part 5 of the EN 1264 series (EN 1264-1 through EN 1264-5), which collectively address definitions, calculation and test methods, and guidance for surface‑embedded water‑based heating and cooling systems.

Q: What are the key keywords?

A: Thermal output, surface embedded heating, underfloor heating, wall heating, ceiling heating, cooling surfaces, recalculation, EN 1264-2, heat transmission coefficient, q = K·Δϑ.