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Forecasting global building internal heat gains to 2100 : an applied XGBoost model driven by shared socioeconomic pathways
ID Rodrigues, Eugenio (Author), ID Tinseth, Jaden (Author), ID Pajek, Luka (Author), ID Fernandes, Marco S. (Author)

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Abstract
Accurate long-term building energy forecasting, essential for climate change mitigation, is often hindered by static internal heat gain assumptions that neglect dynamic socioeconomic shifts. This study addresses this gap in two distinct stages. First, we develop an XGBoost ensemble, leveraging real-world historical data and country-level indicators projected under five Shared Socioeconomic Pathways (SSPs), to forecast key internal heat gains—household sizes and energy intensities for major end-uses—globally through 2100. Validation against a hold-out set of historical data shows high performance metrics (global R2 ≥ 0.96), though interpretation requires caution due to data sparsity in some regions. Second, in an illustrative application, the generated dataset was integrated into building energy simulations for a prototype multi-apartment building across diverse locations. These simulations revealed that using dynamic, projected internal heat gains leads to substantial divergence from standard static assumptions: notably, up to 30 % higher energy demand in developing countries and up to 27 % lower demand in developed nations. These divergent outcomes fundamentally recompose the building’s energy balance, highlighting critical trade-offs between heating and cooling loads. This research exposes the limitations of using single, static values in international building codes and underscores the urgent need for context-specific, dynamic inputs. To this end, we provide an open dataset to support more robust future building energy analyses, inform the design of resilient, “future-proof” buildings, and enhance policy formulation.

Language:English
Keywords:internal heat gains, shared socioeconomic pathways, building energy forecasting, XGBoost, energy policy
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FGG - Faculty of Civil and Geodetic Engineering
Publication status:Published
Publication version:Version of Record
Year:2026
Number of pages:31 str.
Numbering:Vol. 350, art. 116642
PID:20.500.12556/RUL-175829 This link opens in a new window
UDC:620.9:69
ISSN on article:0378-7788
DOI:10.1016/j.enbuild.2025.116642 This link opens in a new window
COBISS.SI-ID:256510723 This link opens in a new window
Publication date in RUL:10.11.2025
Views:3301
Downloads:324
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Record is a part of a journal

Title:Energy and buildings
Shortened title:Energy build.
Publisher:Elsevier
ISSN:0378-7788
COBISS.SI-ID:25395200 This link opens in a new window

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

Language:Slovenian
Abstract:
Natančno dolgoročno napovedovanje porabe energije v stavbah, ki je bistveno za blaženje podnebnih sprememb, pogosto ovirajo statične predpostavke o notranjih toplotnih dobitkih, ki zanemarjajo dinamične družbeno-ekonomske premike. Ta študija to vrzel obravnava v dveh različnih fazah. Najprej razvijemo skupek XGBoost modela, ki izkorišča zgodovinske podatke iz resničnega sveta in kazalnike na ravni držav, predvidene v okviru petih skupnih družbeno-ekonomskih poti (SSP), za napoved ključnih notranjih toplotnih dobitkov – velikosti gospodinjstev in energetske intenzivnosti za glavne končne porabnike – po vsem svetu do leta 2100. Validacija glede na nabor zgodovinskih podatkov kaže visoke metrike učinkovitosti (globalni R2 ≥ 0,96), čeprav je pri interpretaciji potrebna previdnost zaradi redkosti podatkov v nekaterih regijah. Drugič, v ilustrativnem primeru je bil ustvarjeni nabor podatkov integriran v simulacije porabe energije v stav bah za prototip večstanovanjske stavbe na različnih lokacijah. Te simulacije so pokazale, da uporaba dinamičnih, predvidenih notranjih toplotnih dobitkov vodi do znatnega odstopanja od standardnih statičnih predpostavk: predvsem do 30 % večje povpraševanje po energiji v državah v razvoju in do 27 % manjše povpraševanje v razvitih državah. Ti različni rezultati bistveno spreminjajo energijsko bilanco stavbe in poudarjajo ključne kompromise med ogrevalnimi in hladilnimi obremenitvami. Ta raziskava razkriva omejitve uporabe posameznih, statičnih vrednosti v mednarodnih gradbenih predpisih in poudarja nujno potrebo po kontekstualno specifičnih, dinamičnih vhodnih podatkih. V ta namen zagotavljamo odprt nabor podatkov za podporo robustnejšim prihodnjim energetskim analizam stavb, ki bodo prispevale k načrtovanju odpornih, »na prihodnost pripravljenih« stavb in izboljšale oblikovanje politik.

Keywords:notranji toplotni dobitki, skupni socialno-ekonomski trendi, napovedovanje porabe energije v stavbah, XGBoost, energetska politika

Projects

Funder:ARIS - Slovenian Research and Innovation Agency
Project number:P2-0158
Name:Gradbene konstrukcije in gradbena fizika

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