SS-EN-ISO-13791 Thermal performance of buildings - Calculation of internal temperatures of a room in summer without mechanical cooling - General criteria and validation procedures (ISO 13791:2012)

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This International Standard specifies the assumptions, boundary conditions, equations and validation tests for a calculation procedure, under transient hourly conditions, of the internal temperatures (air and operative) during warm periods, of a single room without any cooling/heating equipment in operation. No specific numerical techniques are imposed by this International Standard. Validation tests are included in Clause 8. An example of a solution technique is given in Annex A. This International Standard does not contain sufficient information for defining a procedure able to determine the internal conditions of special zones such as attached sun spaces, atria, indirect passive solar components (trombe walls, solar panels) and zones in which the solar radiation may pass through the room. For such situations different assumptions and more detailed solution models are needed (see Bibliography).

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91.120.10 (Thermal insulation of buildings Thermal insulation in general, see 27.220 Thermal insulating materials, see 91.100.60)

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Designation Name

SS-EN ISO 13791:2012

Revision Level




Publication Date

March 26, 2012



Page Count


International Equivalent

EN ISO 13791:2012(IDT); ISO 13791:2012(IDT)