Ph.d.-forsvar ved Lucile Julia Sarran

Lucile Julia Sarran forsvarer sin ph.d.-afhandling "Occupant-responsive integrated ventilation and heating solutions with excellent comfort for new and renovated dwellings"

Forsvaret finder sted på DTU den 21. september 2021 klokken 13:00.

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Resumé (kun på engelsk): 

Improving the energy efficiency of buildings is key to the green transition. To this aim, building regulations are becoming stricter in most Western countries, with sharpened requirements on the insulation of building envelopes and the efficiency of building systems such as heating, cooling and mechanical ventilation. In Denmark, many new and retrofitted dwellings feature similar components: heavy and highly insulated facades, underfloor heating and mechanical ventilation with heat recovery. However, we know very little about they way these new building systems are used and understood by occupants – all we know is that low-energy dwellings consume more energy than predicted. The goal of this PhD project was to understand in depth people’s opinion about these dwellings and the way they use them, and contribute to the development of solutions to improve both occupant satisfaction and energy efficiency. The project started with a large field study in different types of low-energy dwellings, consisting of a survey and interviews conducted together with social scientists. The results showed that indoor climate was mostly satisfactory, but occupants considered the heating and mechanical ventilation systems to be complex and opaque. They often lacked information and guidance to use them. Moreover, these systems frequently suffered from faults, which were difficult for people to diagnose and could lead to discomfort or energy waste. The project highlighted, through additional case studies in different countries, the influence of factors such as occupants’ understanding of building systems, their perceived control over them, the usability of building interfaces, and occupants’ comfort-related habits, on occupants’ interaction with building systems. In several examples, these factors prevented the technology from reaching its goal (occupant comfort or energy savings): this work shows that more attention should be given to these non-physical drivers of occupant behavior in building regulations and practice. Finally, a fault detection and diagnosis algorithm using grey-box modelling was developed and demonstrated on a test apartment. It permitted to detect faults and inadequate pre-settings on floor heating systems that prevented the system from operating efficiently. Such a method could be used to inform occupants or facility managers and assist them in improving the system performance.


tir 21 sep 21
13:00 - 16:00


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