ISO 15927-2-2009 PDF

Full title and description

ISO 15927-2:2009 — Hygrothermal performance of buildings — Calculation and presentation of climatic data — Part 2: Hourly data for design cooling load. This part defines and specifies methods for calculating and presenting monthly external design climate and representative hourly days to be used when determining building cooling loads and air‑conditioning design conditions.

Abstract

Specifies procedures to identify and present hourly (or three‑hourly) design days and associated parameters (dry‑bulb temperature, solar irradiation or sunshine hours and, where relevant, dewpoint, wind speed and daily temperature swing) for use in calculating design cooling loads and sizing air‑conditioning systems. The document describes selection criteria for days with exceedance probabilities (commonly 5 %, 2 % and 1 %) and presentation formats for hourly peak values required by designers.

General information

• Status: Published (International Standard; under systematic review).
• Publication date: February 2009 (edition 1, 2009‑02 / published 11 February 2009).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 07.060 (Geology / Meteorology / Hydrology); 91.120.10 (Thermal insulation of buildings / Building thermal performance).
• Edition / version: Edition 1 (2009).
• Number of pages: 8 (official ISO published length).

Source: ISO bibliographic record and published abstract.

Scope

Gives definitions, calculation methods and presentation formats for the monthly external design climate and representative hourly data used to determine design cooling loads. Depending on building type, the standard supports selection of days and parameters (dry‑bulb temperature, solar irradiation/sunshine, daily temperature swing, dewpoint and wind) for design conditions with specified exceedance probabilities; it also sets out how to present hourly peak values required for air‑conditioning design.

Key topics and requirements

• Definition of design days and exceedance levels (typical targets: 5 %, 2 %, 1 % exceedance of days within a month).
• Methods to select representative hourly (or three‑hourly) data from long‑term meteorological records.
• Required parameters: dry‑bulb temperature and total global solar irradiation (or sunshine hours); optional inclusion of dewpoint, wind speed and daily temperature swing for specific building types.
• Presentation formats for monthly design climate and for hourly data used in cooling‑load calculations; examples and an informative annex illustrating identification of design days.
• Guidance aimed at ensuring consistent input climate data for cooling‑load and air‑conditioning system design.

Typical use and users

Used by building services engineers, HVAC designers, energy modelers, climate data analysts, standards bodies and researchers to derive and present consistent hourly climate inputs for cooling‑load calculations, system sizing and simulation studies. National standards organizations and vendors often adopt the ISO text as an EN or national standard for regulatory or best‑practice use.

Related standards

Part of the ISO 15927 series on hygrothermal performance of buildings. Closely related parts include ISO 15927‑1 (monthly means of single meteorological elements), ISO 15927‑3 (driving‑rain index from hourly wind and rain data), ISO 15927‑4 (hourly data for assessing annual energy use for heating and cooling) and ISO 15927‑5 (data for design heat load for space heating). This part has also been adopted as EN/BS EN/other national equivalents (e.g., EN ISO/BS EN versions).

Keywords

hygrothermal, climatic data, design cooling load, hourly data, HVAC, cooling design, solar irradiation, design day, ISO 15927, air‑conditioning.

FAQ

Q: What is this standard?

A: ISO 15927‑2:2009 is an ISO International Standard that defines methods to calculate and present hourly climatic data and monthly design climate used for building cooling‑load calculations and air‑conditioning design.

Q: What does it cover?

A: It covers selection and presentation of representative hourly (or three‑hourly) design days, the climatic parameters to be used (dry‑bulb temperature and solar irradiation as mandatory; dewpoint, wind speed and daily swing as optional where relevant), and the presentation formats for use in cooling‑load and AC system design.

Q: Who typically uses it?

A: HVAC and building services engineers, energy modelers, simulation analysts, meteorological data providers and standards bodies — anyone who needs consistent, standards‑based climate inputs for cooling‑load calculations and AC design.

Q: Is it current or superseded?

A: As published in February 2009 (edition 1), ISO 15927‑2:2009 is listed as Published and (per ISO lifecycle) under systematic review; there is no widely published newer ISO replacement as of the ISO bibliographic record. National or regional adoptions (EN/BS EN) exist. Users should check ISO or their national body for any later revisions or confirmations.

Q: Is it part of a series?

A: Yes — it is Part 2 of the ISO 15927 series on the hygrothermal performance of buildings; other parts address monthly means, driving‑rain indices, hourly reference years for annual energy assessment and design heat load for heating.

Q: What are the key keywords?

A: Design day, hourly climatic data, cooling load, solar irradiation, dry‑bulb temperature, dewpoint, wind speed, hygrothermal performance, HVAC design, ISO 15927.