Low ventilation rates (VRs) in schools have been associated with absenteeism, poorer academic performance, and teacher dissatisfaction. We measured VRs in 37 recently constructed or renovated and mechanically ventilated U.S. schools, including LEED and EnergyStar-certified buildings, using CO and the steady-state, build-up, decay, and transient mass balance methods. The transient mass balance method better matched conditions (specifically, changes in occupancy) and minimized biases seen in the other methods. During the school day, air change rates (ACRs) averaged 2.0±1.3 hour , and only 22% of classrooms met recommended minimum ventilation rates. HVAC systems were shut off at the school day close, and ACRs dropped to 0.21±0.19 hour . VRs did not differ by building type, although cost-cutting and comfort measures resulted in low VRs and potentially impaired IAQ. VRs were lower in schools that used unit ventilators or radiant heating, in smaller schools and in larger classrooms. The steady-state, build-up, and decay methods had significant limitations and biases, showing the need to confirm that these methods are appropriate. Findings highlight the need to increase VRs and to ensure that energy saving and comfort measures do not compromise ventilation and IAQ.
This paper develops a brief historical account of the architectural development of auditory space and identifies the “soundsphere” as an acoustic project that connects the interrelationships between material, spatial form and sound. The instrumental design of the soundsphere has focused on three types of shells: hard, static, and inflexible; physically manipulable; and immaterial (or electroacoustic). This frames a disciplinary and historical context for Resonant Chamber, a prototype-based design research project that develops a kinetic and interactive interior envelope system aimed at transforming the acoustic environment through dynamic spatial, material, and electroacoustic technologies.
A B S T R A C TThis paper describes the authors' exploration and experimentation with cellular pneumatic aggregates for kinetic, environmentally responsive envelope systems. The work is situated within the history and technology of pneumatic structures, biological paradigms, the agency and aesthetics of material, information translation, and the tension between performance and affect within responsive environments. The paper elaborates on the physical and computational development of novel pneumatic systems, experimentation with their interactive capabilities, and a recently completed installation, Nervous Ether, a pneumatic spatial envelope that operates as an instrument to register and communicate remote environmental information while also developing affective interaction with inhabitants.
Once an architectural practice has divorced itself from the strictures of the normative service‐to‐client driven professional model, the question of motivation becomes paramount. An architectural practice may very well be alternative, making use of collaborative networks, leveraging institutional affiliations, and finding unusual funding mechanisms—but to what end? Believing that the time has come for a serious re‐engagement on the part of architects with the critical forces that will shape our human future, we have defined three Matters of Concern that both motivate our practice and influence the methods by which we work: Future Ecologies, Situated Infrastructures, and Emerging Inhabitations.
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