ISO 15927-5:2004/Amd 1:2011

Overview

ISO 15927-5:2004/Amd 1:2011 is an important amendment to the international standard focusing on the Hygrothermal Performance of Buildings. Specifically, this part deals with the Calculation and Presentation of Climatic Data, essential for determining the Design Heat Load for Space Heating. Developed by ISO Technical Committee ISO/TC 163, this amendment enhances the accuracy and consistency of climatic data used for thermal performance calculations in building design. The revised guidelines ensure thermal engineers, architects, and HVAC professionals have reliable climate data to optimize heating systems, promote energy efficiency, and improve occupant comfort.

Key Topics

• Updated Climatic Data Definitions
  Clarifications in terms such as "daily maximum temperature" and "daily minimum temperature" ensure data are interpreted consistently using hourly mean values or recorded extremes.

• Calculation Methods for Heat Load Data
  The amendment standardizes how hourly and three-hourly temperature data are averaged for multiple-day periods, improving the reliability of design heat load inputs.

• Reference to Meteorological Standards
  The guidance references the World Meteorological Organization's Guide to Meteorological Instruments and Methods of Observation (WMO No. 8) in its undated form, reflecting the most current methodologies in climate data measurement.

• Correction and Precision Improvements
  Precise terminology corrections, such as replacing “the second day” with “the final day,” tighten methodological clarity when summing or averaging climatic values over time.

Applications

• Building Energy Modelling
  ISO 15927-5:2004/Amd 1 provides essential climatic input data for simulating heating demands, which is critical for energy performance assessments.

• HVAC System Design
  Engineers use the standardized data and calculation approaches to size heating equipment correctly, ensuring adequate thermal comfort without oversizing.

• Energy Efficiency Optimization
  By applying accurate heat load calculations based on robust climatic data, building designers can minimize energy consumption and reduce operational costs.

• Climate-Responsive Architecture
  The standard supports designing buildings that respond effectively to local climate conditions, influencing material choice and architectural form.

• Regulatory Compliance and Certification
  Conformance with ISO 15927-5 helps demonstrate compliance with regional building codes and international green building certification schemes focusing on thermal performance.

Related Standards

• ISO 15927 Series
  This standard is part of a series covering hygrothermal building performance, including moisture transfer, ventilation, and overall thermal calculations.

• World Meteorological Organization (WMO) Guidelines
  The amendment relies on WMO No. 8 for meteorological data collection methods, highlighting the intersection of building physics and climatology.

• ISO 52016
  Thermal performance of buildings - Calculation of energy use for space heating and cooling, which builds upon accurate climatic data inputs like those specified in ISO 15927-5.

• ISO 7726
  Instruments and methods for measuring physical quantities related to thermal environments-complementing data collection procedures referenced in ISO 15927-5.

By adhering to ISO 15927-5:2004/Amd 1:2011, professionals involved in building design and thermal performance analysis can ensure the precision and comparability of climatic data used to define heating requirements. This leads to better-informed energy strategies and contributes to sustainable building practices worldwide.