Contribution to a conference proceedings

FZJ-2026-01378

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Thermostat Control and Window Opening: Impact on Indoor Environmental Conditions and Building Performance

Derbas, G. (Corresponding author)FZJ* ; Ubachukwu, E.FZJ* ; Althaus, P.FZJ* ; Xhonneux, A.FZJ* ; Müller, D.FZJ*

2024

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Please use a persistent id in citations: doi:10.26868/29761662.2024.59

Abstract: This paper investigates thermostat interventionsand window openings across 77 offices duringthe heating and transition seasons of 2023. Acloud-based heating controller, that takes userpreferences and anticipated presence schedules,was evaluated in two buildings of the Living LabEnergy Campus (LLEC) at ForschungszentrumJülich, Germany. Occupants adjust the setpointvia a web-based interface or local interaction. Dataon indoor and outdoor environmental parameters,occupancy and occupant behaviour, and heatingconsumption were collected. Additionally, a web-based survey was conducted on March 2024 forfurther insights. The results indicate that the heat-ing controller effectively adapts to user preferencesand occupancy patterns, significantly influencingheating consumption, alongside the impact of build-ing construction age. Besides, an initial economicevaluation revealed that the implemented mea-sures resulted in approximately 18.5% of energysavings. The heating controller combined with win-dow openings maintained indoor thermal comfort,with 63.7% of occupants preferred no change inthe indoor temperature, and 83.5% reported ac-ceptance of the indoor thermal conditions. About69% of respondents attributed their satisfactionwith room control to their accessibility to differentcontrol options. Space orientation was found to bean important factor affecting temperature setpointsand window opening duration (PDF) Thermostat Control and Window Opening: Impact on Indoor Environmental Conditions and Building Performance. Available from: https://www.researchgate.net/publication/386078784_Thermostat_Control_and_Window_Opening_Impact_on_Indoor_Environmental_Conditions_and_Building_Performance [accessed Jan 29 2026].

Keyword(s): Energy (1st) ; Others (2nd)

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Contributing Institute(s):

1. Modellierung von Energiesystemen (ICE-1)

Research Program(s):

1. 1121 - Digitalization and Systems Technology for Flexibility Solutions (POF4-112) (POF4-112)
2. 1123 - Smart Areas and Research Platforms (POF4-112) (POF4-112)

Appears in the scientific report 2024; 2025

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