ISO 15927-5:2004 PDF

Hygrothermal performance of buildings — Calculation and presentation of climatic data — Part 5: Data for design heat load for space heating

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Title (English):

ISO 15927-5:2004

Hygrothermal performance of buildings — Calculation and presentation of climatic data — Part 5: Data for design heat load for space heating

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 6
Publication date:: November 18, 2004
Edition:: ISO IS 15927 edition 1 version 1
ICS:: 07.060

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Description (English):

ISO 15927-5:2004 specifies the definition, method of calculation and method of presentation of the climatic data to be used in determining the design heat load for space heating in buildings. These include the winter external design air temperatures and the relevant wind speed and direction, where appropriate. Heat loss through the ground, which also contributes to the heat load for buildings, depends on longer-term temperature changes; methods for calculating ground heat loss are given in ISO 13370.

Technical details

Technical committee: ISO/TC 163/SC 2 - Calculation methods
SKU: ISO 15927-5:2004

Abstract

Overview

ISO 15927-5:2004 - "Hygrothermal performance of buildings - Calculation and presentation of climatic data - Part 5: Data for design heat load for space heating" specifies how to define, calculate and present the climatic data used to determine the design heat load for space heating. The standard covers winter external design air temperatures and the associated coincident wind speed and dominant wind direction where relevant. It explains acceptable data sources, averaging periods, return periods and how to report results for building heating design.

Key topics and requirements

Design temperature types
- n‑day mean design temperature (n = 1–4 days): calculated from consecutive-day averages; priority of data resolution: hourly → 3‑hourly → selected daily observations → daily max/min.
- Hourly mean design temperature: defined as the hourly mean exceeded in 99% of hours during the coldest month (coldest month = month with lowest 20‑year average monthly mean).
Return period and records
- Values should be derived from a continuous record where possible (recommended minimum 20 years). The n‑day mean design temperature is specified with a defined return period (standard practice in the document).
Wind data
- Coincident wind speed: use the 95th‑percentile wind speed from periods/hours at or colder than the design temperature; wind speeds referenced or corrected to 10 m above ground.
- Dominant wind direction: analyse wind by non‑overlapping 30° segments; a segment is dominant if wind blows from it ≥ 40% of the time. Report main and secondary segments if applicable.
Presentation requirements
- Report air temperature (°C), wind speed (m/s), direction (°). Provide qualifiers: reference to ISO 15927‑5:2004, return period/frequency, period of records, reference altitude. Round temperatures to 0.1 °C and wind speeds to nearest 0.5 m/s; report “calm” for

Related standards

Other ISO standards

Overview

Key topics and requirements

Design temperature types
- n‑day mean design temperature (n = 1–4 days): calculated from consecutive-day averages; priority of data resolution: hourly → 3‑hourly → selected daily observations → daily max/min.
- Hourly mean design temperature: defined as the hourly mean exceeded in 99% of hours during the coldest month (coldest month = month with lowest 20‑year average monthly mean).
Return period and records
- Values should be derived from a continuous record where possible (recommended minimum 20 years). The n‑day mean design temperature is specified with a defined return period (standard practice in the document).
Wind data
- Coincident wind speed: use the 95th‑percentile wind speed from periods/hours at or colder than the design temperature; wind speeds referenced or corrected to 10 m above ground.
- Dominant wind direction: analyse wind by non‑overlapping 30° segments; a segment is dominant if wind blows from it ≥ 40% of the time. Report main and secondary segments if applicable.
Presentation requirements
- Report air temperature (°C), wind speed (m/s), direction (°). Provide qualifiers: reference to ISO 15927‑5:2004, return period/frequency, period of records, reference altitude. Round temperatures to 0.1 °C and wind speeds to nearest 0.5 m/s; report “calm” for

ISO 15927-5:2004 PDF

Technical details

Abstract

Overview

Key topics and requirements

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Abstract

Overview

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