Zoekresultaten

Rotatable Smart TinyLab, a platform for testing integrated façades and indoor climate

Positive effects of indoor environmental conditions on students and their performance in higher education classrooms: A between-groups experiment

This study explores if multiple alterations of the classrooms' indoor environmental conditions, which lead to environmental conditions meeting quality class A of Dutch guidelines, result in a positive effect on students' perceptions and performance. A field study, with a between-group experimental design, was conducted during the academic course in 2020–2021. First, the reverberation time (RT) was lowered in the intervention condition to 0.4 s (control condition 0.6 s). Next, the horizontal illuminance (HI) level was raised in the intervention condition to 750 lx (control condition 500 lx). Finally, the indoor air quality (IAQ) in both conditions was improved by increasing the ventilation rate, resulting in a reduction of carbon dioxide concentrations, as a proxy for IAQ, from ~1100 to <800 ppm. During seven campaigns, students' perceptions of indoor environmental quality, health, emotional status, cognitive performance, and quality of learning were measured at the end of each lecture using questionnaires. Furthermore, students' objective cognitive responses were measured with psychometric tests of neurobehavioural functions. Students' short-term academic performance was evaluated with a content-related test. From 201 students, 527 responses were collected. The results showed that the reduction of the RT positively influenced students' perceived cognitive performance. A reduced RT in combination with raised HI improved students' perceptions of the lighting environment, internal responses, and quality of learning. However, this experimental condition negatively influenced students' ability to solve problems, while students' content-related test scores were not influenced. This shows that although quality class A conditions for RT and HI improved students' perceptions, it did not influence their short-term academic performance. Furthermore, the benefits of reduced RT in combination with raised HI were not observed in improved IAQ conditions. Whether the sequential order of the experimental conditions is relevant in inducing these effects and/or whether improving two parameters is already beneficial, is unknown.

Influence of blue-green roofs on surface temperature and indoor temperature on building scale

Blue-green roofs have been utilized and studied for their enhanced water storage capacity compared to conventional roofs or extensive green roofs. Nonetheless, research about the thermal effect of blue-green roofs is lacking. The goal of this research is to study the thermal effect of blue-green roofs in order to assess their potential for shielding the indoor environment from outdoor temperature extremes (cold- and heat-waves). In this field study, we examined the differences between blue-green roofs and conventional gravel roofs from the perspective of the roof surface temperatures and the indoor temperatures in the city of Amsterdam for late 20th century buildings. Temperature sensor (iButtons) values indicate that outside surface temperatures for blue-green roofs are lower in summer and fluctuate less during the whole year than temperatures of conventional roofs. Results show that for three warm periods during summer in 2021 surface substrate temperatures peaked on average 5°C higher for gravel roofs than for blue-green roofs. Second, during both warm and cold periods, the temperature inside the water crate layer was more stable than the roof surface temperatures. During a cold period in winter, minimum water crate layer temperatures remained 3.0 o C higher than other outdoor surface temperatures. Finally, also the variation of the indoor temperature fluctuations of locations with and without blue-green roofs have been studied. Locations with blue-green roofs are less sensitive to outside air temperature changes, as daily temperature fluctuations (standard deviations) were systematically lower compared to conventional roofs for both warm and cold periods.

Rotatable Smart TinyLab, a platform for testing integrated façades and indoor climate

The new Smart TinyLab (STL) for system integration in the building industry is a lab where building partners and construction-related companies can develop, test, validate and demonstrate their products in practice to be as energy-efficient as possible to contribute to formulated CO2 emission reduction targets.

Occupant response to transitions across indoor thermal environments in two different workspaces

To understand how transition across different thermal zones in a building impacts the thermal perception of occupants, the current work examines occupant feedback in two work environments — nursing staff in hospital wards and the workers in an office. Both studies used a mix of subjective surveys and objective measurements. A total of 96 responses were collected from the hospital wards while 142 were collected from the office. The thermal environment in the hospital wards was perceived as slightly warm on the ASHRAE thermal sensation scale (mean TSV = 1.2), while the office workers rated their environment on the cool side (mean TSV =  0.15). The results also show that when the transitions were across temperature differences within 2 °C, the thermal perception was not impacted by the magnitude of the temperature difference — as reflected in occupant thermal sensation and thermal comfort/thermal acceptability vote. This would imply that the effect of temperature steps on thermal perception, if any, within these boundaries, was extremely short lived. These findings go towards establishing the feasibility of heterogeneous indoor thermal environments and thermal zoning of workspaces for human comfort.

The influence of the indoor environment on people displaying challenging behaviour: a scoping review

BACKGROUND: The care sector for persons with disabilities considers the physical environment relevant for the quality of life of people with intellectual disabilities. However, scientific evidence is limited. OBJECTIVE: To obtain evidence regarding comforting and encouraging environments and to develop an overview of studies addressing the effect of the physical environment on people with intellectual disabilities. METHODS: A scoping review, accompanied by expert panels and case findings combining scientific evidence and knowledge from practice, was performed to investigate the interaction between challenging behaviour and the physical environment. Between January and March 2020, several scientific databases were searched in the English, Dutch, and German language for relevant studies. Social media, care professionals, and experts in building physics were consulted. RESULTS: Studies on building-related factors as passive interventions and care- or therapy-related interventions could be distinguished. The majority of the studies report on building-related factors such as sound, acoustics, light, and colours and their influence on behaviour. Specific guidelines are lacking on how to adjust the indoor environment to an environment that is safe, comforting and encouraging for people displaying challenging behaviour. Proposed solutions are case-based. CONCLUSION: In future studies individual cases could be studied in a more in-depth manner, aligned and categorised to the building-related factors and to the expressions of challenging behaviour.