The relationship between energy use and height is examined for a sample of 611 office buildings in England and Wales using actual annual metered consumption of electricity and fossil fuels. The buildings are of different ages; they have different construction characteristics and methods of heating and ventilation; and they include both public and commercial offices. When rising from five storeys and below to 21 storeys and above, the mean intensity of electricity and fossil fuel use increases by 137% and 42% respectively, and mean carbon emissions are more than doubled. A multivariate regression model is used to interpret the contributions of building characteristics and other factors to this result. Air-conditioning is important, but a trend of increased energy use with height is also found in naturally ventilated buildings. Newer buildings are not in general more efficient: the intensity of electricity use is greater in offices built in recent decades, without a compensating decrease in fossil fuel use. The evidence suggests it is likely – although not proven – that much of the increase in energy use with height is due to the greater exposure of taller buildings to lower temperatures, stronger winds and more solar gains.

A new approach to the creation of design tools is proposed that addresses the real information needs of designers in the early stages of design of non-residential buildings. Traditional simplified design tools are typically too limited to be of much use, even in conceptual design. The proposal is to provide access to the power of detailed simulation tools at a stage in design when little is known about the final building, but at a stage also when the freedom to explore options is greatest and the ability to improve the design is greatest. The concept of the building performance sketch forms the basis of the proposed design tool. It was derived from consultation with design analysis teams as part of the development of the COMFEN tool for fenestration design. Tools like COMFEN are explored to understand how they were shaped by consultation and how requests from these teams for real-world relevance might shape such tools in the future. The simulation process can effectively utilize some of the as-built, as-occupied and as-managed lessons on behaviours and technical outcomes from the Post-occupancy Evaluation (PoE) of buildings. Il est proposé pour la création des outils de conception une nouvelle approche répondant aux véritables besoins d'information des concepteurs dans les premières phases de conception des bâtiments non résidentiels. Les outils de conception simplifiée traditionnels sont habituellement trop limités pour être très utiles, même en design conceptuel. Ce qui est proposé est de pouvoir accéder à la puissance d'outils de simulation détaillée à un stade de la conception où l'on sait encore peu de choses concernant le bâtiment final, mais également à un stade auquel la liberté d'exploration des options possibles comme la capacité d'amélioration de la conception sont les plus grandes. Le concept du schéma de performance du bâtiment constitue la base de l'outil de conception proposé. Il découle de la consultation des équipes chargées de l'analyse de la conception dans le cadre du développement de l'outil COMFEN de conception du fenêtrage. Des outils tels que COMFEN sont examinés afin de comprendre comment ils ont été modelés par la consultation et comment les demandes de ces équipes en termes de pertinence réelle pourraient façonner ces outils à l'avenir. Le processus de simulation peut tirer efficacement parti de certaines des leçons, conformes à l'exécution, à l'occupation et à la gestion, en matière de comportements et de résultats techniques, retirées de l'Evaluation Après Occupation des bâtiments. modèles d'information du bâtiment bâtiments processus de conception outils de conception début de conception efficacité énergétique retour d'information simulation des performances évaluation après occupation

Building science commonly studies comfort—a subjective concept—through quantitative methods. These methods are often not the most appropriate to study subjective concepts because they struggle to consider non-quantifiable factors that are sometimes relevant in the determination of people’s comfort. Complementing the already used quantitative methods with qualitative ones can help illuminate some of the areas where the former struggle, but this is an uncommon practice in building science. This paper presents the results of a qualitative study that aimed at understanding comfort without the constraints of it being quantifiable. It introduces the feeling of comfort model, which summarises what was found. This model suggests that most building science comfort models ignore more than two out of the three factors that determine people’s comfort. Additionally, it shows that it is potentially possible to make sense of the psychology and subjectivity of comfort in an organised and structured manner. This example of how qualitative methods can be a powerful addition to building science’s comfort research. Practice relevance This paper reports a project that sought to understand an occupant-centred meaning of ‘comfort’ (constrained to what has conventionally been described as thermal, visual and acoustic domains). A qualitative model of the feeling of comfort was developed from the empirical data collated in the study. This model demonstrates that it was possible to make sense of the subjective nature of comfort in a coherent and ordered manner. This study argues that the qualitative and subjective nature of comfort should be embraced within building design and building science practice. Although this model was not meant to predict comfort quantitatively, it can serve as a theoretical basis for informing policymaking, building performance analysis and comfort research. For instance, it can help evaluate the assumptions behind building performance simulation (e.g. questioning whether people will truly open windows in certain scenarios).

The COVID-19 pandemic has highlighted the importance of good ventilation in mitigating the transmission of airborne virus particles. In many countries, CO2 monitors have been mandated for use in indoor spaces to inform good ventilation practices. However, there is limited guidance on the use of CO2 monitors to assess ventilation performance in large groups of buildings. In occupied classrooms, locating multiple monitors to collate reliable environmental data can be a difficult task because of the functions and usage of the space. This study used observations and physical measurements of CO2 in three real-world naturally ventilated classrooms, in three primary schools to assess whether the use of a single CO2 monitor, in one location could predict the room ventilation performance. The results indicate that for naturally ventilated classrooms, a single CO2 monitor placed at head height (about 1.5 m) on a vertical wall, away from windows, doors, or air supply, and not directly under the breathing zone of occupants can be used to express the ventilation performance of classrooms. This study provides a systematic method for monitoring CO2 to direct ventilation intervention programmes for large groups of school buildings.