Abstract
Occupant-centric data streams, and more specifically continuous subjective occupant feedback (CSOF) systems, offer the possibility for autonomous collection of occupant feedback in buildings. They are made possible by recent developments in pervasive ICT technology and can enable a continuous flow of information that may enhance human-centric building design and operation. Due to the relative novelty of these systems, no research has been developed so far to systematically evaluate whether information collected by CSOF systems is truly representative of the entire population's opinions and evaluations. In this study, we analyze how information on occupant's opinions on indoor climate collected though a multi-level CSOF system compare to the information obtained though simultaneously performed manual surveys. We used data collected from five field tests in modern office buildings with uninformed occupants, and compare a total of 317 Satisfaction evaluations, 124 Complaints, and 44 Control actions with 546 surveys. Using logistic regression techniques, we investigated the relations between the feedback information and the information from surveys. We found that cumulative link models were suitable for modeling the relationship between feedback and survey data. The Building ID tag was the most important variable for modeling Occupant satisfaction and Occupant complaint feedback. Occupant control actions was best modeled using the Workplace ID. When comparing CSOF with surveys, we found a Mean Absolute Error (MAE) of 16% and of 12%, for Occupant satisfaction and for Occupant complaint feedback, respectively. We demonstrated that the adopted methods are suitable for understanding the meaning of the collected CSOF data. Further studies based on this methodology and using a larger dataset should be carried out to deepen the understanding of CSOF feedback significance and to increase the soundness of the results obtained in this study.
Highlights
Acquiring real occupants’ opinions on indoor environmental quality is crucial for improving building performance through both design and operation
Further studies based on this methodology and using a larger dataset should be carried out to deepen the understanding of continuous subjective occupant feedback (CSOF) feedback significance and to increase the soundness of the results obtained in this study
This study concludes a wider project that investigated the func tioning and validity of CSOF systems, where continuous subjective occupant feedback from field tests is studied by comparison to survey results, measurements of physical indoor climate and results of focus interviews [4,25]
Summary
Acquiring real occupants’ opinions on indoor environmental quality is crucial for improving building performance through both design and operation. Post Occupancy Evaluation (POE) methods that include surveys or interviews are currently the only established tool for col lecting subjective evaluations from building users. These methods have been described as the most people-oriented approaches for analyzing architectural spaces [1]. POEs are point in time investigations where, (most often standardised) surveys are distributed to occupants during the use-phase of a building. They are still rarely used as an “everyday” process in either the building commissioning phase or in other phases of the building life with the exception of research activities [2]. Per today, POEs though survey-collected feedback are among the best procedures we have to systematically and quantitatively know what the occupant’s opinions are
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