Development of a Reduced Order Model of Solar Heat Gains Prediction

Meril Tamm*, Jordi Macia Cid, Roser Capdevila Paramio, Joan Farnos Baulenas, Martin Thalfeldt, Jarek Kurnitski

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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The aim of this study was to elaborate and validate a reduced order model able to forecast solar heat gains as a function of the architectural parameters that determine the solar heat gains. The study focused on office buildings in Catalonia and Spain and their physical values were taken from the Spanish Building Technical Code and European Union Directive 2018/844. A reduced order model with three direct variables (solar heat gain coefficient, shade factor, window to wall ratio) and one indirect design variable (building orientation) was obtained and validated in respect to the International Performance Measurement and Verification Protocol. Building envelope properties were fixed and the values were taken from the national standards of Spain. This work validates solar heat gain coefficient as a primary variable in determining the annual solar heat gains in a building. Further work of developed model could result in building energy need quick evaluation tool in terms of solar heat gains for architects in building early stage as it has an advantage over detailed building simulation programs in terms of instant calculation and the limited need for predefined input data.

Original languageEnglish
Article number6316
Number of pages17
Issue number23
Publication statusPublished - 30 Nov 2020
MoE publication typeA1 Journal article-refereed


  • reduced order model
  • solar heat gains
  • building thermal performance

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